Model: CKGD

Pilot-to-open check valve with sealed pilot

Cavity: T-17A | Capacity:

Model

CKGDXCN

Control

Cracking Pressure

Seal Material

Material/Coating

Where to buy

Technical features

This valve is a pilot to open check valve. It has a sealed pilot, a steel seat, and is non-vented. It allows free flow from the valve (port 2) to the load (port 1) and blocks flow in the opposite direction. Pressure at the pilot (port 3) will open the valve from port 1 to port 2. Pilot pressure needed at port 3 to open the valve is directly proportional to the load pressure at port 1. Pressure at port 2 directly opposes pilot pressure.

This 3 port pilot-to-open check valve and 3 port counterbalance valves are physically interchangeable (i.e. same cavities, same flow path for a given frame size). However, cartridge extension dimensions from the mounting surface may vary.
Provides hose break protection, prevents loads from drifting and positively locks pressurized loads.
Extremely low leakage. The seat and poppet are heat treated for long life. If the load drifts due to the valve, the seat has probably been damaged by contamination and the valve should be replaced.
Sealed pilot for use in circuits where cross port leakage is undesirable.
Optional external porting out of the hex end of the cartridge is available for external piloting. In this configuration, port 3 is blocked. See Control options E, and P.
Pilot-to-open check cartridges are locking valves, not motion control valves. For motion control applications, use counterbalance valves.
For models with manual load release control option, turn load release clockwise to release load.
Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Technical Data

Cavity
T-17A
Series
3
Capacity
60 gpm
Maximum Operating Pressure
5000 psi
Pilot Ratio
3:1
Maximum Valve Leakage at 110 SUS (24 cSt)
1 drops/min.
Valve Hex Size
1 1/4 in.
Valve Installation Torque
150 - 160 lbf ft
Model Weight
1.10 lb
Seal kit - Cartridge
Buna: 990-017-007
Seal kit - Cartridge
EPDM: 990-017-014
Seal kit - Cartridge
Polyurethane: 990-017-002
Seal kit - Cartridge
Viton: 990-017-006

Performance curves

CAD Files

Model CAD Files

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Frequently asked questions

What parts of the Sun cartridge valve are field serviceable?
I need to discharge a large accumulator. How can I increase the capacity of my discharge circuit?
What should I do if I need load holding on the rod of a high ratio cylinder?
What happens to the pilot-to-open check valve if I have back pressure in my system?
Other companies make high ratio PO checks. Why doesn't Sun?
Can I control the motion of a load with a pilot-to-open check valve?
How do I know how much pilot pressure is required to open a pilot-to-open check valve?
Where should I mount pilot-to-open check valves in my system?
Can I use pilot-to-open check valves with paired cylinders?
What about intensification?
How big is a drop of hydraulic oil?
Vented pilot-to-open check valves are insensitive to pressure on the valve port (port 2), aren't they?
Should I replace the pilot-to-open check valve if my cylinder is drifting or moving?
Where should a vented valve be vented?
What is the actual pilot ratio of Sun's pilot to open check valves?
What ever happened to the Delrin seated valves?
What does pilot ratio refer to in a pilot-to-open check valve?
Direct acting or pilot operated - what do I use?
What is the difference between pilot-to-open check valves with sealed pilots compared to standard bleed through versions?
My load keeps drifting, and every time I take your valves out, the nose seals have been blown out of their grooves.
I want to use your pilot-to-open checks on air. Will they work?
Can I use a three-port vented pilot-to-open check valve instead of the four-port version to save on plumbing?