HYDRAULIC CHECK VALVES

Parker Ball Bearing Rotary Fittings are used to connext a fixed point to a rotating, swinging or moving part via hoses. These products are used to prevent torsion and small hose radius.

Ball Rotary

Parker ball bearing rotary fittings are used to connext a fixed point to a rotating, swinging or moving part via hoses. These products are used to prevent torsion and small hose radius.
The ball bearing rotary fittings are suitable for hydraulic oils and lubricants on minerl oil base as flow media.
The construction of this service-proved product range is characterized by a compact, maintenance-free construction. The ball bearing rotary fittings have a combined ball and plain bearing with constant lubrication, a low starting torque and wear-resistant annular piston sealings.

Markets:
• Chemical Industries
• Plant engineering
• Power stations
• Cable storage

Applications:
• Suitable for general hydraulic applications.

Features/ Benefits of the ball bearing rotary fittings:
• Parker ball bearing rotary fittings help to avoid torsion of hoses and therefore improve the life cycle of these products
• Parker ball bearing rotary fittings have a Cr(VI)free surface, which is highly corrosion resistant (in average 500 hours against white rust). This surface renews the life cycle of the component and the entire hydraulic system.
• The construction of the ball bearing fittings is maintenance-free, so that the costs for maintenance will be reduced.

Technical specifications:
Materials: Casing, body nut of steel. Annular piston sealing: POM/FKM. Eolastic sealing: NBR, also available in FKM.
Surface: Cr(VI)free
Nominal temperatures: -14 °C up to +80 °C
Construction Systems:
8 different versions with one rotational axis. Multiaxial rotary couplings on request. Tube connections according to DIN 2353, series S. Maximum working pressure 350 bar (peak pressure)
Male stud sealing by Eolastic seals of NBR
Male stud with metric parallel or BSPP thread.

Parker’s pilot operated check valves series CPOM in sandwich design ensure an easy configuration of stack systems and provide a very good price-performance ratio.

SERIES CPOM

Pilot operated check valves series CPOM are part of Parker’s complete range of sandwich plate valves and ensure an easy configuration of conventional stack systems. Additionally they provides a very good price-performance ratio.

Depending on the function required, one or two pilot operated check valves are arranged in the ports A and/or B. The free flow direction is always from the valve side to the manifold side.

Function
The check valves open when flowing to the consumer side, where the opposing check valve is hydraulically-mechanically pilot operated simultaneously by a control spool, and thus the return flow is enabled from other consumer sides.

Markets:
• Industrial
• Machine tools
• Rubber & Tire

SERIES CPOM

Features/Benefits
• The valve bodies of the Parker Manapak valve series CPOM are made of steel
• The valve poppet is precisely guided into the steel sleeve and ensures a good seal on the seat
• When the valve poppet is open, the large cross-section allows high flow rates at low differential pressure
• Different control ratios can be chosen with the NG06 and NG10 valves
• Pre-opening for CPOM*HT to achieve smooth opening
• Reliable operation in conventional stack systems
• Very good price-perfomance ratio
• Short delivery time

Applications:
• Tire presses
• Machine tool

Parker’s C series check valve offers superior construction and high versatility due to its variety of materials, sizes and port styles. It can be used in hydraulic, pneumatic and water applications in both the mobile and industrial markets.

Parker’s C series check valves permit free flow in one direction, and dependable shut-off in the reverse direction.

Purpose Check Valve-C Series

The C Series Check Valve port options include ISO 6149, NPT, BSPP, BSPT and SAE. Material offerings are brass, steel and stainless steel. The steel C Series Check Valve comes standard with a black oxide finish.

Markets:
• Power Gen
• Machine Tools
• Factory automation
• Vehicle Assembly Facilities
• Molding
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Oil & Gas
• Machine tools
• Material Handling
• Mining
• Marine

Features/Benefits:
• Soft seat construction for low leakage
• Pressures up to 5,000 PSI
• Available in Brass, Steel and Stainless Steel
• Port sizes from 1/8 up to 2”

Applications:
• Accumulator circuits
• Tank line backpressure
• Power units
• Tank line backpressure
• High low pump circuits

Parker double-throttle check valves series FM in sandwich design offer an easy configuration of stack systems and provide a very good price-performance ratio. They are optionally available with a cylindrical needle for fine adjustment in NG06 and NG10.

Double-throttle check valves series FM in NG06, NG10, NG16 and NG25 are part of Parker’s complete range of sandwich plate valves and provide high flow at low pressure drop for precise and energy-efficient processes. They ensure an easy configuration of conventional stack systems. Throttle and check valves are located in ports A and B.

SERIES FM

Markets:
• Industrial
• Machine tools

Features/Benefits:
• Compact, proven design – ensures reliable operation in conventional stack systems
• Two types of metering needle design (FM2 and FM3) – enable to select the optimum throttle characteristics required to suit the application
• Large bypass check valves – allow high flow at low pressure drop
• Very good price-perfomance ratio
• Short delivery time – no warehousing necessary
• Four sizes:
– NG06 (CETOP 03 / NFPA D03)
– NG10 (CETOP 05 / NFPA D05)
– NG16 (CETOP 07 / NFPA D07)
– NG25 (CETOP 08 / NFPA D08)

Applications:
• Suitable for general hydraulic applications
• Machine tools

Function:
FM2 and FM3 can be used as meter-in or meter-out throttle by changing the mounting position. FM4 can be selected by ordering code as meter-in or meter-out throttle. FM6 is only available as meter-out control.

The throttle check valve can also be used to influence the switching time of pilot operated directional valves. In this case, the valve is positioned between the pilot stage (CETOP 03, NG06) and the main stage (CETOP 05, NG10 up to CETOP 10, NG32).

Parker check valves are unidirectional flow control devices used primarily in hydraulic systems to eliminate potential damage caused by fluid back pressure.

DT-Valve

DT Series Check Valves (up to 5,000 psi) have a metel to metal hard seat design with a one piece body and all steel construction. The body is a compact size with a variety of male port end configurations. These are in-line unidirectional valves with standard spring crack pressures of 1, 5, and 65 psi. The DT Series are available in a wide range of sizes for flow capacities up to 100 gpm.

Check valves are important components that are often overlooked when building a fluid system. A check valve can optimize system performance in the following ways:
• Ensure hydraulic fluid flows in only one direction
• Eliminate potential damage from back pressure
• Isolate sections of a system or system components

Basic check valve construction consists of a valve body with an inlet and an outlet port. Inside, a moveable poppet valve is controlled by spring pressure. In most cases the valve is normally closed, opening when the fluid pressure is greater than the spring force (crack pressure), thus allowing the fluid to flow in only one direction. When reverse flow attempts to enter though the outlet the poppet closes and flow through the valve is stopped.

Hard seat check valves utilize a durable metal to metal seal to withstand high flow surges and provide longer service life.

Technical Characteristics:
• Sizes: 1/4” to 1-1/4”
• Material: Steel
• Inlet Port Ends: Male ORB, Male JIC, Male ORFS
• Outlet Port Ends: Male ORB, Male JIC, Male ORFS
• Optional crack pressures available from 1 to 200 psi in 5 psi increments
• Orificed valve option
• Custom shapes and configurations

Note: Some options may not be standard configurations. Please contact the Quick Coupling Division for availability and delivery.

Markets:
• Industrial
• Construction
• Agriculture
• Transportation
• MRO

Features/Benefits:
• Allows the fluid to flow in only one direction, protecting the system from fluid back pressure
• metal to metal hard seat provides longer life and is durable for high flow surges
• Custom shapes and configurations can integrate special features to reduce the number of components and potential leak points in a system
• Optional crack pressures are available on request
• Optional orificed valve allows metered flow when the valve is closed. Orifice bore size is determined by application requirements.

Applications:
• Industrial, mobile, and construction equipment
• Restrictor Check Circuit
• High/Low Pump Circuit
• Slow Advance/Rapid Return Circuit
• Oil Cooler By-Pass Circuit
• Sequence Circuit
• Pilot Pressure Circuit
• Accumulator Circuit

Parker direct operated check valves series C5V with SAE flange are easy to install and provide high flow rates. They can be mounted either directly on the outlet flange of pumps or on the inlet flange of actuators to achieve a very compact design.

C5V Series

Parker direct operated check valves series C5V ensure free flow in one direction and block the flow in the counter direction while providing high flow rates for optimized performance. They are part of the Parker valve range with SAE flanges which is unique in its variety.

The SAE flanges in size SAE61 or SAE62 allow to mount the C5V directly on the outlet flange of pumps or on the inlet flange of actuators to achieve a very compact design. They protect against pressure shocks from the system.

Markets:
• Industrial

C5V Series

Features/Benefits:
• Proven, robust design – ensures reliable operation
• SAE61 and SAE62 flange – enables compact design
• Maximum adjustable pressure of 420 bar and flow capacity ranging from 100 l/min to 750 l/min – high performance
• Numerous flow rates and 5 body sealing options – extremely versatile
• Encapsulated spring – keeps it from going solid
• Short delivery time – no warehousing necessary
• Direct operated check valve
• 4 sizes (SAE ¾”, 1″, 1¼”, 1½”)
• 3 springs

Applications:
• Suitable for general hydraulic applications

Capable of flows from 3.5 to 303 lpm (0.9 to 80 gpm) and pressure as high as 420 bar (6,000 psi), Parker’s poppet and ball style check valves have a simple and robust design which are used to block flow in one direction, and allow flow in the opposite.

STANDARD CHECK VALVES

Parker’s robust poppet and ball style check valves are designed for the most demanding applications with flows up to 303 lpm (80 gpm) and pressures as high as 420 bar (6,000 psi) across several markets such as agriculture, construction, and industrial manufacturing. These valves feature a hardened poppet or ball and seat design that keeps leakage as low as 5 drops per minute or less while lengthening service life due to improved wear characteristics, and the wide selection of crack pressures available ensures easy system integration with reliable performance.

Markets:
• Agriculture
• Construction Equipment
• Material Handling Equipment
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Wide range of body sizes, crack pressures, and flow capacities
• Low leakage – less than 5 drops/min
• Simple construction – extremely cost effective
• High tolerance for contamination
• All external parts zinc plated

Applications:
• Load holding
• Component isolation
• Backflow prevention
• Anti-cavitation
• Markets where cleanliness is an issue

Additional Technical Insight:
Parker ball type check valves are designed with a ball held against a seat by a spring. This prevents flow in one direction at all times, but permits flow in the opposite direction when the pressure is high enough to lift the ball off its seat. The pressure at which reverse flow is permitted is called the cracking pressure. By using a hardened ball and finished seat, leakage rates are less than 5 drops per minute in the blocking direction.

Parker’s P.O. check valve assemblies allow flow up to 150 lpm (40 gpm) with pressures up to 420 bar (6,000 psi). Return flow can be enable by an external pilot supply, which shifts the internal poppet into an open position.

PILOT TO OPEN CHECK VALVES

Parker’s reliable pilot piston style P.O. check valves are designed for critical applications where safety and load holding is required and flows from 19 to 150 lpm (5 to 40 gpm) and pressures up to 420 bar (6,000 psi) are needed. These valves are available with pilot supply to either the 1st port or 3rd port depending on circuit need, and are generally used in conjunction with linear actuators across several markets within mobile or industrial hydraulics, such as aerials, material handling, and construction where durable and low leak valves are necessary to keep the machinery and operators safe.

Markets:
• Aerial
• Construction
• Material Handling
• Miscellaneous Mobile

Features/Benefits:
• Spherical poppet for low leakage
• Hardened precision ground parts for durability
• “D”-Ring design eliminates back-up rings
• Optional sealed pilot piston

Applications:
• Load holding without fine metering

Additional Technical Insight:
Pilot operated check valves, also known as P.O. checks, are used to lock a cylinder in a holding position with minimal leakage or drift. P.O. check valves that can be opened to allow flow in the reverse direction with an external signal to the pilot port. The valves work best when used in conjunction with a control valve that vents the valve ports to tank when centered. Pilot pressure to open the checks for reverse flow is a ratio of the holding pressure, and are typically 3:1 or 4:1. A 3:1 ratio with a 3000psi load requires a 1000psi signal to the pilot port.

Plain bearing rotary fittings for slow rotating, swinging or moving machine parts up to 40 bar (series L) or up to 100 bar (series S).

Plain Rotary

Flow media:
Hydraulic oils and lubricants on mineral oil base. Also for hydraulic fluids HETG and HEES. Not suitable for corrosive and HFC-fluids or gases.

Technical Specifications:
Materials: Casing, body nut and progressive ring of steel. Sealing of NBR (Perbunan), on request of FKM. Plain bearing rotary fittings are not available in stainless steel or brass.
Surface: Cr(VI)-free
Construction-system:
Series L, tube O.D. 6 to 35 mm, working pressure (PN): 40 bar
Series S, tube O.D. 6 to 38 mm, working pressure (PN): 100 bar
Tube connection according to DIN 2353, ISO 8434-1. Male stud with metric thread and BSP thread. Sealing of male stud by Eolastic-seals.
Nominal temperature:
For sealings of NBR: -35°C up to +100°C
For sealings of FKM: -25°C up to +120°C

Markets:
• Chemical Industries
• Plant engineering
• Power stations
• Cable storage

Applications:
• Connecting a fixed point to a rotating, swinging or moving machine part via hoses. To prevent torsion and to avoid small hose radius.

Features/ Benefits of the ball bearing rotary fittings:
• Parker plain bearing rotary fittings help to avoid torsion of hoses and therefore improve the life cycle of these products

Parker direct operated and hydraulically pilot operated check valves series C4V are robust and almost universally applicable. They are equipped with a leak-free seat cartridge.

SERIES C4V

The direct operated and hydraulically pilot operated check valves series C4V are proven components of Parker’s check valve product range which ensure a leak-free blocking of the flow. The robust valves are almost universally applicable and provide numerous options.

Markets:
• Industrial

Features/Benefits:
• Versatile – useable for numerous applications
• Proven, robust design – ensures reliable operation
• Good price-performance ratio – fast return of investment
• Short delivery times – no warehousing necessary
• 3 sizes: NG10, NG25, NG32
• Leak-free seat type cartridge
• Max. pressure 350 bar
• Optionally with position control (pilot operated version)

Applications:
• Suitable for general hydraulic applications

SERIES C4V

Function C4V direct operated
Direct operated check valves C4V allow free flow from A to B. The counter direction is blocked. The C4V series are equipped with a leak-free seat type cartridge.

The pressure arising in port A lifts the poppet from the valve seat and releases the flow to B. In the counter direction, the spring and the pressure on top of the cartridge hold the poppet onto the seat and block the flow.

Function C4V pilot operated
Hydraulically pilot operated check valves series C4V also allow free flow from A to B, the counter-flow direction is blocked. When pressure is applied to control port X, the ring chamber flow from B to A is released. Up to four different pilot control ratios are available.

When no pressure is applied to the X-port, the flow from B to A is blocked, because the pressure in B is also in effect on top of the poppet. Pressurizing the X port relieves the area on top of the poppet to the drain port and allows flow from B to A. The seat design of the valve provides leak-free separation of port A and B in the closed position.

Hydraulically pilot operated valves with position control are available on request.

Parker’s pilot operated check valves series ZRE are designed for maximum flow rates up to 120 l/min and long lifetime. They ensure a almost leak-free positioning of the actuator.

ZRE Series

Pilot operated check valves series ZRE in size NG06 (CETOP 03) and NG10 (CETOP 05) are part of Parker’s complete range of sandwich plate valves and ensure the easy configuration of conventional stack systems. They provide maximum flow rates up to 120 l/min and long lifetime. ZRE valves are typically used in combination with spool type directional control valves to enable an almost leak-free positioning of the actuator.

The inlet flow is free while the outlet flow is blocked. Pressure in the inlet line opens the check valve and allows free outlet flow.

Markets:
• Industrial
• Machine tools

ZRE Series

Features/Benefits:
• Compact, proven design – ensures reliable operation in conventional stack systems
• High flow capacity – provides optimum efficiency in relation to valve size
• Long lifetime – offers a very good price-perfomance ratio
• Short delivery time – no warehousing necessary
• Available in two sizes:
ZRE01 – NG06 (CETOP 03)
ZRE02 – NG10 (CETOP 05)
• Check function in A, B or A + B

Applications:
• Suitable for general hydraulic applications
• Machine tools

Parker direct operated check valves series CM in sandwich design are predestined for an easy configuration of stack systems. A large number of options offer a multitude of uses for hydraulic switching.

CM Series

Parker direct operated check valves series CM in sandwich design are part of Parker’s complete range of sandwich plate valves and ensure an easy configuration of conventional stack systems. Additionally they provide a very good price-performance ratio.

Series CM is available in two sizes, NG06 and NG10. Depending on the function required, one or two check valves are arranged in ports P, T, A, and B. Number and flow direction can be selected from the ordering code.

Markets:
• Industrial
• Machine tools
• Rubber & tire processing

CM Series

Features/Benefits:
• 8 options for the arrangement of the check valve in the body – multitude of uses for hydraulic switching
• Valve bodies are made of steel – extra strength and durability
• Function can be changed by turning the valve – easy handling
• Short delivery time for most versions – no warehousing necessary
• Two sizes:
– CM2 – NG06 (CETOP 03)
– CM3 – NG10 (CETOP 05)
• Maximum operating pressure 350 bar

Applications:
• Suitable for general hydraulic applications
• Machine tools
• Tire presses

Parker’s throttle check valves series ZRD in sandwich design feature maximum flow rates up to 160l/min and enable an easy configuration of stack systems.

ZRD Series

Throttle check valves series ZRD in size NG06 (CETOP 03) and NG10 (CETOP 05) are part of Parker’s complete range of sandwich plate valves. Designed for maximum flow, they ensure the easy configuration of conventional stack systems.

The throttle check function can be located in port A or B as well as in A + B. Meter-in or meter-out functionality can be selected by model code. A low flow/high resolution version in NG06 for sensitive shifting time adjustment of pilot operated directional control valves is available on request.

Markets:
• Industrial
• Machine tools

ZRD Series

Features/Benefits:
• Compact, proven design that represents our long-term experience in hydraulics – increases reliability
• High flow capacity – optimum efficiency in relation to valve size
• Various functional arrangements – suitable for almost every application
• Short delivery time – no warehousing necessary
• Available in two sizes:
ZRD01 – NG06 (CETOP 03)
ZRD02 – NG10 (CETOP 05)

Applications:
• Suitable for general hydraulic applications
• Machine tools

Parker’s ball and poppet style check valves are cartridges designed to be inserted inside manifolds and can handle flow up to 500 lpm (132 gpm) and pressures at 420 bar (6,000 psi) for circuit optimization and space savings.

INSERT CHECK VALVES

Parker’s ball and poppet style insert check valves save space and reduce complexity with their high flow and low leak designs. These valves have the capability to handle flow up to 500 lpm (132 gpm) and pressures at 420 bar (6,000 psi), with a variety of crack pressure settings available as standard options. The simple construction and tolerance for contamination makes these insert check valves a cost effective solution for hydraulic systems across many markets and applications.

Markets:
• Construction Equipment
• Material Handling Equipment
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• For inserting inside manifold blocks
• Minimal leakage – less than 3 drops/min
• High flow capacity
• Simple construction – extremely cost effective
• Wide range of crack pressures available
• High tolerance for contamination
• All external parts zinc plated

Applications:
• High flow applications
• Load holding
• Markets where cleanliness is an issue

Parker check valves series SPZBE in size NG16, NG25 and NG32 are proven slip-in cartridge valves. Key advantage of this robust valve: the little space which is required for installation.

SPZBE Series

The check valves series SPZBE are very functional and robust slip-in cartridge valves providing high flow rates (up to 900 l/min) in relation to the size. They are available in three sizes: NG16, NG25 and NG32.

The function unit is fixed inside the manifold by a hexagonal plug with slot. The design is based on CE series with same poppet and sleeve. The different mounting cavity has to be considered.

Markets:
• Industrial
• Molding

SPZBE Series

Features/Benefits:
• High flow rates up to 900 l/min – optimum efficiency in relation to valve size
• Less installation space required – makes integration easy
• Leak-free from port B to A – ensures reliable operation
• Robust design – for long service life even under rough conditions
• Shortest delivery time for most variations – no warehousing necessary
• 4 different opening pressures from 0.1 to 4.0 bar

Applications:
• Suitable for general hydraulic applications
• Injection Molding

The screwable check valves series RK and RB are designed to go into simple, threaded cavities. They block the flow in one direction and open in the opposite direction.

RK and RB Series

Parker’s very robust check valves series RK and RB ensure a reliable operation even at high operating pressures (up to 700 bar). They are designed to be screwed into simple, threaded cavities. The connection is O-ring sealed on the 118° shoulder in the mounting cavity. The valve body is supplied as a unit, with a spring loaded, hardened and polished semisphere of stainless bearing steel inside. The seat is also hardened and ground.

Markets:
• Industrial

RK and RB Series

Features/Benefits:
• Proven, solid design – very good wear behaviour
• Zero leakage in closed position – ensures reliable operation
• Short delivery time – no warehousing necessary
• Two variations:
– RK: mounted in the blocked direction
– RB: mounted in open flow direction

Applications:
• Suitable for general hydraulic applications

Parker’s thermal bypass valves modulate fluid temperature by shifting return line flow through the cooler, or bypassing it directly to the reservoir.

TH Series Thermal Bypass Valves

TH Series Thermal Bypass Valves are used to modulate fluid temperature by shifting return line flow through the cooler, or bypassing it directly to the reservoir. Additionally, an integral pressure relief function automatically releases excess pressure to the reservoir if the cooler becomes restricted, and the inlet pressure becomes excessive. Relief crack pressure settings range from 5 to 85 psi in 5 psi increments. The TH Series is available in 1″” size and rated for pressures up to 250 psi with a max flow rate 60 gpm. There are five standard shift temperatures.

Technical Characteristics:
• Valve Size: 1″”
• Material: Aluminum
• Weight: 2.0 lbs
• Port Ends: Female SAE O-Ring Boss
• Standard Crack Pressure Setting Options: 5 to 85 psi (in 5 psi increments)
• Standard Shift Temperature Options (°F): 100°, 120°, 140°, 160°, 180°
• Full Shift Temperature (cooler port open): Shift temperature plus 25°F
• Proof Pressure: 300 psi (21 bar)
• Minimum Burst Pressure (up to full shift temperature): 325 psi (22 bar)
• Minimum Burst Pressure (above full shift temperature): 600 psi (41 bar)
• Operating Temperature: Min= -30°F, Max= Shift temperature plus 75°F
• Max Flow Rate: 60 gpm (227 l/m)

Markets:
• Construction
• Agriculture
• On and Off Road Equipment

Features/Benefits:
• Ideal for hydrostatic drive circuits requiring fast warm up, controlled fluid temperatures, and low return line back pressure.
• Lightweight, corrosion resistant aluminum housing
• Integral relief valve dumps excess inlet pressure to the reservoir
• Five standard shift temperature options
• Wide range of crack pressure options from 5 to 85 psi

Applications:
• Hydrostatic drive circuits

Parker’s swing type check valves are designed to protect low pressure air, liquid, or gas systems from fluid back pressure.

2600 Series Check Valves have a spring-loaded, trapdoor style valve. The valve opens when system pressure approaches 1/2 psi to permit full flow with low pressure drop. As system pressure is relieved, the valve closes, retaining fluids upstream.

2600 Series Check Valves

These in-line check valves are designed with a low crack pressure spring especially for diesel and gasoline engine fuel lines. The 2600 Series are available in two sizes and can be used in low pressure air, liquid or gas systems.

Technical Characteristics:
• Sizes: 1/4”, 3/8”
• Material: Aluminum
• Port Ends: Male NPTF

Markets:
• Construction
• Mobile Equipment
• Truck

Features/Benefits:
• Lightweight corrosion resistant aluminum construction
• Swing style valve allows full flow with low pressure drop
• 1/2 psi maximum crack pressure for use in low pressure air, liquid, or gas systems

Applications:
• Diesel and gasoline engine fuel lines
• Externally mounted oil filters and coolers
• Transmission fluid lubrication lines

Designed to lock hydraulic circuits or actuators in rest conditions, Parker’s dual pilot operated check valves allow bidirectional flow ranging up to 19 lpm (5 gpm) and pressure up to 207 bar (3,000 psi) after pilot pressure is supplied.

CPD084P Series

Parker’s family of dual pilot operated check valves feature a space and cost saving design that fits in a common industry cavity and can operate with hydraulic system flows as high as 19 lpm and pressures up to 207 bar. The internal pilot piston of Parker’s selection make these valves suitable for load and position holding applications within a broad range of markets, such as the aerial, construction, material handling, industrial markets, and many more. The standard catalog option for these reliable valves has a pilot ratio of 3:1 in order to meet application needs without requiring high pilot pressures.

Markets:
• Aerial
• Construction Equipment
• Forestry Equipment
• Material Handling Equipment
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Cost effective – replaces two cartridges
• Hardened, precision ground parts for durability
• Internal pilot piston
• Common cavity
• All external parts zinc plated

Applications:
• Load holding
• Position holding

Additional Technical Insight:
The CPD084P rated at 3000 psi with a flow rating of up to 5 gpm. The integrated pilot piston has a 3:1 pilot ratio. At rest the internal checks remain seated, blocking flow from exiting the cylinder and locking the cylinder in place. When pressure is applied to either valve port, the check valve will open allowing free flow from the inlet to the actuator port across the check valve. As pressure is applied to shift the cylinder, the internal piston will also shift to mechanically shift open the flow path across the opposite check valve, allowing flow to pass back across the valve in the return direction.

Hydraulically pilot operated check valves series RH for in-line mounting allow free flow in one direction (B to A). The counter flow (A to B) is blocked leak-free.

RH Series

The hydraulically pilot operated check valves series RH for in-line mounting are proven components of Parker’s check valve product range which ensure a leak-free blocking of the flow and thus a reliable operation. They allow free flow in one direction (B to A), the counter flow is blocked (A to B). By applying pilot pressure the ball can be lifted from its seat and allows flow from A to B.

Most common use:
• Keeping cylinders leak-free in position, when spool type directional control valves are used
• Return line discharge, when return flow exceeds functional limits of directional control valve at differential cylinders
• As hydraulically activated drain or circulation valve

Markets:
• Industrial

Features/Benefits:
• Spring-loaded balI seated valve – enables zero leakage
• Proven, robust design – ensures reliable operation
• Flexible, versatile mounting in any orientation – makes integration easy
• Short delivery time for most variations – no warehousing necessary
• Maximum operating pressure up to 700 bar

Applications:
• Suitable for general hydraulic applications

Function:
The valves are available without and with hydraulic predischarging.

Without pre-discharging
These valves have a ball as valve element, which quickly enables the full flow cross-section proportionally during pilot operation. A metering position in the pilot port dampens the control movement of the pilot spool so that pressure shocks (unloading shocks) are mostly suppressed.

With pre-discharging
For valves with pre-discharging a spherical polished valve spool (seat valve function) is built-in instead of a ball. The additional check valve achieves a pre-opening which provides shock-free unloading of the fluid, especially at high working pressure and large volumes.

The hydraulically pilot operated check valve series SVLB is based on Parker’s comprehensive modular DIN cartridge system. It is mainly used to shut-off the cylinder.

SVLB1 Series

Parker’s hydraulically pilot operated check valves series SVLB in cartridge design ensure a reliable shut-off of the cylinder for smooth operation. They allow free flow from A to B. The counter-flow direction is blocked. When pressure is applied to control port X, the ring chamber flow from B to A is released.

Markets:
• Industrial

Features/Benefits:
• Proven design – allows a reliable cylinder shut-off
• Cavity and mounting pattern acc. to ISO 7368 – for quick and easy integration
• 5 sizes, NG16 to NG50 – makes selection easy
• Nominal flow up to 1800 l/min – optimum efficiency in relation to valve size
• Short delivery time for most variations – no warehousing necessary
• Pilot control ratio is 6:1
• Optionally with dampening poppet

SVLB1 Series

Applications:
• Suitable for general hydraulic applications
• General presses

Function
When no pressure is applied to the X-port, the flow from B to A is blocked, because the pressure in B is also effective on top of the poppet. Pressurizing the X-port relieves the area on top of the poppet to the drain port and allows flow from B to A. The seat design of the SVLB valve series provides leak-free separation of port A and B in the closed position.

Parker check valves are unidirectional flow control devices used primarily in hydraulic systems to eliminate potential damage caused by fluid back pressure.

DC-Valve

DC Series Check Valves (up to 3,000 psi) have a metel to metal hard seat design with a one piece body and all steel construction. Both inlet and outlet ports have female end fittings. These are in-line unidirectional valves with standard spring crack pressures of 1, 5, and 65 psi. The DC Series have low pressure drop and are available in a wide range of sizes up to 2″” and flow capacities to 300 gpm.

Check valves are important components that are often overlooked when building a fluid system. A check valve can optimize system performance in the following ways:
• Ensure hydraulic fluid flows in only one direction
• Eliminate potential damage from back pressure
• Isolate sections of a system or system components

Basic check valve construction consists of a valve body with an inlet and an outlet port. Inside, a moveable poppet valve is controlled by spring pressure. In most cases the valve is normally closed, opening when the fluid pressure is greater than the spring force (crack pressure), thus allowing the fluid to flow in only one direction. When reverse flow attempts to enter though the outlet the poppet closes and flow through the valve is stopped.

Hard seat check valves utilize a durable metal to metal seal to withstand high flow surges and provide longer service life.

Technical Characteristics:
• Sizes: 1/4” to 2″”
• Material: Steel
• Inlet Port Ends: Female NPSF, Female UNF, Female NPTF, Female UN
• Outlet Port Ends: Female NPSF, Female UNF, Female NPTF, Female UN
• Optional crack pressures available from 1 to 200 psi in 5 psi increments
• Orificed valve option
• Custom shapes and configurations

Note: Some options may not be standard configurations. Please contact the Quick Coupling Division for availability and delivery.

Markets:
• Industrial
• Construction
• Agriculture
• Transportation
• MRO

Features/Benefits:
• Allows the fluid to flow in only one direction, protecting the system from fluid back pressure
• Low pressure drop
• metal to metal hard seat provides longer life and is durable for high flow surges
• Custom shapes and configurations can integrate special features to reduce the number of components and potential leak points in a system
• Optional crack pressures are available on request
• Optional orificed valve allows metered flow when the valve is closed. Orifice bore size is determined by application requirements.

Applications:
• Industrial, mobile, and construction equipment
• Restrictor Check Circuit
• High/Low Pump Circuit
• Slow Advance/Rapid Return Circuit
• Oil Cooler By-Pass Circuit
• Sequence Circuit
• Pilot Pressure Circuit
• Accumulator Circuit

Designed to lock hydraulic circuits or actuators in rest conditions, Parker’s dual pilot operated check valves allow bidirectional flow from 38 lpm (10 gpm) to 226 lpm (60 gpm) and pressures up to 350 bar (5,000 psi) after pilot pressure is supplied.

CDPH103X Series

Parker’s family of dual pilot operated check valves feature a space and cost saving design that fits in a common industry cavity and can operate with hydraulic system flows as high as 226 lpm and pressures up to 350 bar. The internal pilot piston of Parker’s selection make these valves suitable for load and position holding applications within a broad range of markets, such as the aerial, construction, material handling, industrial markets, and many more. These reliable valves have pilot ratios of 3:1 and 4:1 as available options depending on application needs.

Markets:
• Aerial
• Construction Equipment
• Forestry Equipment
• Material Handling Equipment
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Cost effective – replaces two cartridges
• Hardened, precision ground parts for durability
• Internal pilot piston
• Common cavity
• All external parts zinc plated

Applications:
• Load holding
• Position holding

Additional Technical Insight:
These valves use a standard pilot piston and two standard Parker check valves in an assembled body. At rest the check valves remain seated, blocking flow from entering and exiting the cylinder and locking the cylinder in place. When system pressure is applied to either valve port, the check valve will open allowing free flow from the inlet to the actuator port across the check valve. As pressure builds to shift the cylinder, the internal pilot piston, utilizing a 3:1 or 4:1 ratio, will respond quickly to the system pressure and will shift against the return check. This action mechanically pilots the valve open to allow return flow to pass through the valve from the actuator back to tank. With both ports now open, the valve is unlocked and the hydraulically powered cylinder is free to move. When system pressure is shut off to the valve, the valve will return to the holding condition restricting actuator movement and locking the system in place. These valves are ideal for load holding applications, where metering conditions are not required.

Parker’s poppet style check valve with thermal relief allow flows up to 130 lpm (40 gpm) and pressure to 420 bar (6,000 psi), with thermal relieving in the reverse direction to protect the circuit from high hydraulic fluid thermal expansion pressures.

D04F2X Series

Parker’s poppet style check valve with integrated thermal relief is capable of flows up to 130 lpm (40 gpm) and pressures up to 420 bar (6,000 psi). This unique thermal relief valve is designed to help protect the circuit from hydraulic fluid thermal expansion due to ambient or system temperature rise. Additionally, this valve will also act to relieve pressure spikes due to shocks seen by the hydraulic system. Circuit designers can also utilize a Parker supplied pilot spool to create a pilot operated check valve with the thermal relief functions.

Markets:
• Aerial
• Construction Equipment
• Forestry Equipment
• Material Handling Equipment
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Poppet type for minimal leakage – less than 3 drops/min
• Hardened working parts for maximum durability
• Relief feature to give thermal and shock relief
• Single and dual pilot pistons available to create pilot to open check
• Compact design
• High tolerance for contamination
• All external parts zinc plated

Applications:
• Machinery in hot work environments
• Actuators that experience high levels sun exposure
• Implements that may be detached from main hydraulic circuit for long periods of time
• Applications or machinery that contains quick disconnect couplers

Additional Technical Insight:
Can also use a Parker supplied pilot spool to create a pilot operated check valve with the thermal relief functions. This valve’s operation allows free flow from port 1 to 2 and integral thermal relief function from port 2 to 1 to protect the circuit from thermal expansion of hydraulic fluid.

Parker check valves are unidirectional flow control devices used primarily in hydraulic systems to eliminate potential damage caused by fluid back pressure.

CPIFF-Valve

CPIFF Series Check Valves (5,000 psi) are soft seat, zero leakage poppet check valves with compact one piece construction. Standard crack pressures are 5, 15, 25, and 65 psi. These valves are available in a wide range of sizes up to 1″”, with female fitting ends and flow capacities up to 30 gpm.

Check valves are important components that are often overlooked when building a fluid system. A check valve can optimize system performance in the following ways:
• Ensure hydraulic fluid flows in only one direction
• Eliminate potential damage from back pressure
• Isolate sections of a system or system components

Basic check valve construction consists of a valve body with an inlet and an outlet port. Inside, a moveable poppet valve is controlled by spring pressure. In most cases the valve is normally closed, opening when the fluid pressure is greater than the spring force (crack pressure), thus allowing the fluid to flow in only one direction. When reverse flow attempts to enter though the outlet the poppet closes and flow through the valve is stopped.

Soft seat check valves have an O-ring or similar elastomeric seal between the poppet and body for improved leak resistance. The soft seat design is most compatible with “”clean” systems and is not indented for use in systems that have high surge flow. The seal material dictates the temperature range of the valve.

Technical Characteristics:
• Sizes: 1/4” to 1”
• Materials: Steel, Brass
• Seal Material: Fluorocarbon
• Standard Crack Pressures (psi): 5, 15, 25, and 65
• Port Ends: Female NPSF, Female SAE, Female British Parallel BS 2779
• Optional crack pressures available
• Orificed valve option
• Custom shapes and configurations

Note: Some options may not be standard configurations. Please contact the Quick Coupling Division for availability and delivery.

Markets:
• Industrial
• Construction
• Agriculture
• Transportation
• MRO

Features/Benefits:
• Allows the fluid to flow in only one direction, protecting the system from fluid back pressure
• Soft seated valve creates a leak free seal
• Fluorocarbon seal is standard
• Optional crack pressures are available on request
• Optional orificed valve allows metered flow when the valve is closed. Orifice bore size is determined by application requirements.
• Custom shapes and configurations can integrate special features to reduce the number of components and potential leak points in a system

Applications:
• Industrial, mobile, and construction equipment
• Restrictor Check Circuit
• High/Low Pump Circuit
• Slow Advance/Rapid Return Circuit
• Oil Cooler By-Pass Circuit
• Sequence Circuit
• Pilot Pressure Circuit
• Accumulator Circuit

The shuttle valve series SSR is designed as a threaded cartridge valve. All parts are assembled in one unit and easy to mount.

SSR Series

Parker’s solid shuttle valve series SSR is a threaded cartridge valve in size NG06 or NG10 for a wide variety of applications. Since all parts are assembled in one unit, it is easy to mount and thereby ensures a cost-efficient installation.

Markets:
• Industrial

Features/Benefits:
• Little space required – for compact system design
• Easy assembly – saves costly time
• Leak-free – ensures reliable operation
• Short delivery time for most variations – no warehousing necessary

Applications:
• Suitable for general hydraulic application

SSR Series

Parker non-return valves with an ISO 8434-2 (Triple-Lok®) or 8434-3 (O-Lok®) connection offer a wide range of sizes, male threads and cracking pressures, making them very flexible.

SAE_Check valves Series

Parker non-return valves with an ISO 8434-2 (Triple-Lok®) or 8434-3 (O-Lok®) connection offer a wide range of sizes, male threads and cracking pressures, making them very flexible.
The principle of a two-part non-return valve with an integrated soft sealing element has been proven by many applications in the market.
This reliability is the reason for its successful use in applications with Triple-Lok® (37° flare) or O-Lok® (O-Ring face seal).

Parker non-return valves are available with Cr(VI)-free surfaces. The broad product range goes from sizes 4 to 24 (6 mm to 38 mm O.D.); UNF, BSPP and metric male threads are available. The cracking pressures are from 0.2 to 6 bar. The maximum flow velocity is 8 m/sec. The nominal pressure PN: Triple-Lok® up to PN 350 bar and O-Lok® up to PN 400 bar.
Markets:
• Automotive
• Defence
• Energy
• Environment
• Industrial
• Infrastructure
• Machine Tools
• Materials Handling
• Mobile
• Oil and Gas
• Power Generation
• Process
• Transportation
• Water
Applications:
• Suitable for general hydraulic applications.
Features/ benefits of SAE non-return valves:
• The precise functioning of Parker SAE non-return valves has been proven a million times over and stands for the reliability of this product range.
• Combined soft and metal sealing – leak-free due to soft sealing at cone and metal-supported sealing at cone – extends the safety of the product and the entire hydraulic application.
• The usage of Parker SAE non-return valves is flexible due to the wide range of cracking pressures available.
• For yet more applications, internal parts in stainless steel with FPM are also available.
• The wide range of male threads also increases the number of potential applications.

Parker’s P.O. check valve’s allow flows up to 226 lpm (60 gpm) and pressure up to 350 bar (5,000 psi). Return flow can be enable by an external pilot supply, which shifts the internal poppet into an open position.

CSP103X Series

Parker’s reliable pilot piston style P.O. check valves are designed for critical applications where safety and load holding is required and flows from 38 to 226 lpm (10 to 60 gpm) and pressures up to 350 bar (5,000 psi) are needed. These valves are generally used in conjunction with linear actuators across several markets within mobile or industrial hydraulics, such as aerials, material handling, and construction where durable and low leak valves are necessary to keep the machinery and operators safe.

Markets:
• Aerial
• Construction
• Material Handling
• Miscellaneous Mobile

Features/Benefits:
• Spherical poppet for low leakage
• Hardened precision ground parts for durability
• “D”-Ring design eliminates back-up rings
• Optional sealed pilot piston

Applications:
• Load holding without fine metering

Additional Technical Insight:
The CSP(H) series uses a standard pilot piston and a standard Parker check valve in an assembled body. At rest the check valve remains seated, blocking flow from exiting the actuator port and locking the circuit in place. When pressure and flow are opened to the valve inlet, the check valve will allow free flow to the actuator. The valve assembly also utilizes an internal pilot piston with a 3:1 or 4:1 ratio. When sufficient pressure is applied to the pilot port, the piston will respond quickly and will shift against the return check. This action mechanically pilots the valve open, unlocking the circuit, to allow return flow to pass through the valve from the actuator back to tank. When system pressure is shut off to the valve, the valve will return to the holding condition restricting actuator movement and locking the system in place. These valves are ideal for load holding applications, where metering conditions are not required.

Parker’s CP series valve allows free flow in one direction and flow in the counter direction is blocked until pilot pressure unseats the poppet and permits flow in the opposite direction.

CP Series

Parker’s CP series have 1 and 2 stage poppets available with pilot ratios of 1 : 5 and 1 : 40, to suit different operating conditions.

Markets:
• Factory Automation
• Machine Tools
• Marine
• Material Handling
• Mining
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Molding
• Oil &Gas
• Power Generation
• Vehicle Assembly Facilities

Features/Benefits:
• Available in inline and subplate mounting
• Available with Oil or Air pilot
• Poppets available in soft, nylon and metal

Applications:
• Suitable for general hydraulic applications

Parker check valves designed for “reverse” flow from the side port (port 2) to the end port (port 1) from 19 to 500 lpm (5 to 132 gpm) and pressures up to 420 bar (6,000 psi), allowing manifold space optimization while achieving superior performance.

CVH104 Series

Parker’s dynamic side-to-nose style check valves are designed for unique applications where “reverse” check flow is required and flows from 19 to 500 lpm (5 to 132 gpm) and pressures up to 420 bar (6,000 psi) are needed. These valves can be used virtually anywhere a standard check valve would be utilized across several markets within mobile hydraulics, industrial hydraulics, and manufacturing while allowing more flexibility within manifold and hydraulic circuit design.

Markets:
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Hardened, precision ground parts for durability
• Fully guided poppet for smooth operation
• Side to nose design for ease of manifold design
• All external parts zinc plated

Applications:
• Check valve applications that require opposite porting

Parker’s direct operated check valves series ZRV in size NG06 (CETOP 03) and NG10 (CETOP 05) are equipped with a cartridge type insert to ensure zero leakage and high lifetime.

ZRV Series

Direct operated check valves series ZRV in NG06 (CETOP 03) and NG10 (CETOP 05) are part of Parker’s complete range of high-performance sandwich plate valves and ensure the easy configuration of stack systems. ZRV valves have a cartridge type insert to provide zero leakage and high lifetime. The check function can be located in the P- or in the T-port.

Markets:
• Industrial
• Machine tools

Features/Benefits:
• Compact, proven design – ensures reliable operation in conventional stack systems
• High flow capacity – provides optimum efficiency in relation to valve size
• Leakage-free seat – enables improved process accuracy
• High lifetime – offers low whole-life costs
• Short delivery time – no warehousing necessary
• Available in two sizes:
ZRV01 – NG06 (CETOP 03)
ZRV02 – NG10 (CETOP 05)
• Opening pressure 0.5 bar

Applications:
• Suitable for general hydraulic applications
• Machine tools

Parker check valves are unidirectional flow control devices used primarily in hydraulic systems to eliminate potential damage caused by fluid back pressure.

CV-Valve

CV Series Check Valves (3,000) psi are in-line unidirectional valves that have a two piece modular design. The larger body results in less pressure drop and increased performance. These check valves have standard spring crack pressures of 5 and 65 psi. The CV Series are available in a range of sizes up to 1″” and flow capacities to 100 gpm.

Check valves are important components that are often overlooked when building a fluid system. A check valve can optimize system performance in the following ways:
• Ensure hydraulic fluid flows in only one direction
• Eliminate potential damage from back pressure
• Isolate sections of a system or system components

Basic check valve construction consists of a valve body with an inlet and an outlet port. Inside, a moveable poppet valve is controlled by spring pressure. In most cases the valve is normally closed, opening when the fluid pressure is greater than the spring force (crack pressure), thus allowing the fluid to flow in only one direction. When reverse flow attempts to enter though the outlet the poppet closes and flow through the valve is stopped.

Hard seat check valves utilize a durable metal to metal seal to withstand high flow surges and provide longer service life.

Technical Characteristics:
• Sizes: 1/4”to 1″”
• Material: Steel
• Inlet Port Ends: Male UNF, Male UN
• Outlet Port Ends: Male UNF, Male UN, Male UNS
• Fitting Styles: Male Flare Inlet to Male Flare Outlet, Male O-Ring Boss Inlet to Male Seal-Lok Outlet
• Fitting O-ring Material: Nitrile
• Optional crack pressures available
• Orificed valve option
• Custom shapes and configurations

Note: Some options may not be standard configurations. Please contact the Quick Coupling Division for availability and delivery.

Markets:
• Industrial
• Construction
• Agriculture
• Transportation
• MRO

Features/Benefits:
• Allows the fluid to flow in only one direction, protecting the system from fluid back pressure
• All steel construction
• Low pressure drop for increased performance
• Poppet valve is heat treated to help prevent galling and damage from shocks and surges
• Optional crack pressures are available on request
• Optional orificed valve allows metered flow when the valve is closed. Orifice bore size is determined by application requirements.
• Custom shapes and configurations can integrate special features to reduce the number of components and potential leak points in a system

Applications:
• Industrial, mobile, and construction equipment
• Restrictor Check Circuit
• High/Low Pump Circuit
• Slow Advance/Rapid Return Circuit
• Oil Cooler By-Pass Circuit
• Sequence Circuit
• Pilot Pressure Circuit
• Accumulator Circuit

Parker check valves are unidirectional flow control devices used primarily in hydraulic systems to eliminate potential damage caused by fluid back pressure.

S6C and 3C Series Check Valves (up to 6,000 psi) are soft seat, zero leakage poppet check valves with a two piece construction. The two piece construction allows for a variety of end fitting combinations.

S6C and 3C Series Check Valves

These check valves have various standard crack pressures and flow rates up to 175 gpm. The S6C & 3C Series valves are available in a range of sizes and steel or stainless steel materials for flow capacities up to 175 gpm.

Check valves are important components that are often overlooked when building a fluid system. A check valve can optimize system performance in the following ways:
• Ensure hydraulic fluid flows in only one direction
• Eliminate potential damage from back pressure
• Isolate sections of a system or system components

Basic check valve construction consists of a valve body with an inlet and an outlet port. Inside, a moveable poppet valve is controlled by spring pressure. In most cases the valve is normally closed, opening when the fluid pressure is greater than the spring force (crack pressure), thus allowing the fluid to flow in only one direction. When reverse flow attempts to enter though the outlet the poppet closes and flow through the valve is stopped.

Soft seat check valves have an O-ring or similar elastomeric seal between the poppet and body for improved leak resistance. The soft seat design is most compatible with “”clean” systems and is not indented for use in systems that have high surge flow. The seal material dictates the temperature range of the valve.

Technical Characteristics:
• Sizes: 1/4”to 2”
• Materials: Steel, Stainless Steel, Brass
• Seal Material: Fluorocarbon
• Standard Crack Pressures (psi): 5, 15, 25, 65
• Inlet Port Ends: Male NPT, Male 37 degree flare, Male Face Seal, Female NPTF, Female SAE, Female British Parallel BS 2779
• Outlet Port Ends: Male NPT, Female NPTF, Female SAE, Male SAE 37 degree Flare, Male Face Seal, Female British Parallel BS 2779
• Optional crack pressures available
• Orificed valve option
• Custom shapes and configurations

Note: Some options may not be standard configurations. Please contact the Quick Coupling Division for availability and delivery.

Markets:
• Industrial
• Construction
• Agriculture
• Transportation
• MRO

Features/Benefits:
• Allows the fluid to flow in only one direction, protecting the system from fluid back pressure
• Soft seated valve creates a leak free seal
• Fluorocarbon seal is standard
• Optional crack pressures are available on request
• Optional orificed valve allows metered flow when the valve is closed. Orifice bore size is determined by application requirements.
• Custom shapes and configurations can integrate special features to reduce the number of components and potential leak points in a system

Applications:
• Industrial, mobile, and construction equipment
• Restrictor Check Circuit
• High/Low Pump Circuit
• Slow Advance/Rapid Return Circuit
• Oil Cooler By-Pass Circuit
• Sequence Circuit
• Pilot Pressure Circuit
• Accumulator Circuit

Pilot-to-close check valves operate as standard check valves, but block flow completely when a pilot signal is supplied; capable of flows up to 38 lpm (10 gpm) and pressures up to 240 bar (3,500 psi).

CPC101P Series

Parker’s durable pilot-to-close PO check valves are designed for demanding applications where precise regen functionality is required that have flows up to 38 lpm (10 gpm) and pressures up to 240 bar (3,500 psi) across several markets such as construction, material handling, and industrial manufacturing. These valves feature an internal pilot operated piston that will help simplify hydraulic circuit or manifold design with a standard pilot ratio of 2:1 that requires half the pilot pressure than the load pressure, and ensures easy system integration with reliable performance.

Markets:
• Construction Equipment
• Material Handling Equipment
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Mobile

Features/Benefits:
• Hardened, precision ground parts for durability
• Fully guided poppet for smooth operation
• All external parts zinc plated

Applications:
• Cylinder regen functions

Additional Technical Insight:
Pilot operated check valves, also known as PO checks, are used to lock a cylinder in a holding position with minimal leakage or drift, and can be opened to allow flow in the reverse direction with an external signal to the pilot port. These valves work best when used in conjunction with a control valve that vents the valve ports to tank when centered. Pilot pressure to open the checks for reverse flow is a ratio of the holding pressure, which a 2:1 is standard offering for this valve. As an example, a 2:1 ratio with a 2,000 psi load requires only a 1,000 psi signal to the pilot port in order to shift the valve. Pilot to close checks are a normally open version of PO checks, whereby a pilot signal is required to close, not open, the check valve.

Parker pilot operated check valves series C5P with SAE flange are easy to install and provide high flow rates. They can be mounted directly on the flanges of actuators to achieve a very compact design.

C5P Series

The pilot operated check valves series C5P ensure free flow in one direction and block the flow in the counter direction while providing high flow rates for optimized performance. They are part of the Parker valve range with SAE flanges which is unique in its variety. The robust valves are almost universally applicable and provide numerous options.

Pilot operated check valves series C5P have a similar design to the subplate mounted C4V series. The SAE flange allows to mount the C5P directly on the outlet flange of pumps or on the inlet flange of actuators to achieve a very compact design.

Markets:
• Industrial

Features/Benefits:
• Proven, robust design – ensures reliable operation
• 2-port body with SAE61 flange – enables compact design
• Maximum adjustable pressure of 350 bar and flow capacity ranging from 180 l/min to 600 l/min – high performance
• Versatile – useable for numerous applications
• Good price-performance ratio – fast return of investment
• Short delivery time – no warehousing necessary
• Pilot operated check valve
• 3 sizes (SAE ¾”, 1″, 1¼”)
• 4 opening ratios
• Optional with position control (C5P08 and C5P10 only)

C5P Series

Applications:
• Suitable for general hydraulic applications

Parker’s CM series check valves is an integral, full flow check valve.

Check Sandwich Valve CM

Parker’s CM series check valves provide an integral, full flow check valve in the pressure ‘P’ port, ‘A’ port, ‘B’ port, or the tank ‘T’ port of the directional valve. Reverse flow is blocked. The CM2 and CM3 sizes offer a combination P&T check version.

Markets
• Factory Automation
• Lumber & Wood
• Machine Tools
• Material Handling
• Miscellaneous Industrial
• Miscellaneous Manufacturing
• Miscellaneous Processing
• Molding
• Packaging Machinery
• Plastic Processing
• Primary Metal Refining Process
• Rubber & Tire Processing
• Vehicle Assembly Facilities

Features/Benefits
• Valve bodies are manufactured from steel which provides extra strength and durability for longer life
• Internal hardened steel components also provide longer life
• Positive shut-off is provided by a fully guided poppet and allows full flow in the unchecked position
• Parker CM sandwich style check valves can be used either on the ‘P’, ‘A’, ‘B’, ‘T’ ports, or combinations
• Large internal flow paths allow high flow at low pressure drop

Applications
• Suitable for general hydraulic applications