Created on 12/08/2016

 2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2

MODEL

CKEF

Vented pilot-to-open check valve with external pilot port, sealed pilot, and stem

seal

SERIES 2 / CAPACITY: 120 L/min. / CAVITY: T-2A

This valve is a pilot to open check valve. It has a sealed pilot, a steel seat, and is 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 external pilot port will

open the valve from port 1 to port 2. Pilot pressure needed to open the valve is directly proportional to the load

pressure at port 1. The valve is insensitive to pressure at port 2 because the spring chamber references the vent

(port 3).

TECHNICAL DATA

Cavity T-2A

Series 2

Capacity 120 L/min.

Pilot Ratio 3:1

Maximum Operating Pressure 350 bar

Maximum Valve Leakage at 110 SUS (24 cSt) 0,07 cc/min.

Valve Hex Size 28,6 mm

Valve Installation Torque 61 - 68 Nm

Seal kit - Cartridge Buna: 990202007

Seal kit - Cartridge Polyurethane: 990002002

Seal kit - Cartridge Viton: 990202006

Model Weight 0.22 kg.

(S)CONTROL

S External 4-SAE Pilot Port, Vent to Port

V External 1/4 NPTF Pilot Port, Vent to

Port 3

(C)CRACKING PRESSURE

C 30 psi (2 bar)

D 50 psi (3,5 bar)

E 75 psi (5 bar)

F 100 psi (7 bar)

(N)SEAL MATERIAL

N Buna-N

V Viton

snhy.com/

CKEF

Model Code Example: CKEFSCNCONFIGURATION OPTIONS

Created on 12/08/2016

 2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2

TECHNICAL FEATURES

There is a positve seal between ports 2 and 3.

These valves should be considered service items only. New applications should use valves from the CV*V family.

This valve has a proportional pressure reducing characteristic that limits the pressure developed at port 1 to about 75% of the pressure at port 2.

Pilot pressure as low as 15 psi (1 bar) higher than the pressure at the vent can prevent the valve from closing.

Provides hose break protection, prevents loads from drifting and positively locks pressurized loads.

Sealed pilot for use in circuits where cross port leakage is undesirable.

Pilot-to-open check cartridges are locking valves, not motion control valves. For motion control applications, use counterbalance valves.

Extremely low leakage. If the load drifts due to the valve, the seat has probably been damaged by contamination and the valve should be replaced.

This 3 port pilot-to-open check valve is not physically interchangeable with other 3 port pilot-to-open check valves or counterbalance valves due to the different

pilot/vent configuration.

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.

PERFORMANCE CURVES