Created on 09/21/2015

 2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2

MODEL

CKIV

Vented pilot-to-open check valve - atmospherically referenced

SERIES 4 / CAPACITY: 480 L/min. / CAVITY: T-19A

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 pilot (port 3) 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 is referenced out the

back of the hex body.

TECHNICAL DATA

Pilot Ratio 3:1

Maximum Operating Pressure 350 bar

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

Seal kit - Cartridge Buna: 990-019-007

Seal kit - Cartridge Polyurethane: 990-019-002

Seal kit - Cartridge Viton: 990-019-006

(X)CONTROL

X Standard Pilot, Atmospheric Vent

S External 4-SAE Vent Port

(C)CRACKING PRESSURE

C 30 psi (2 bar)

A 4 psi (0,3 bar)

B 15 psi (1 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

MATERIAL/COATING

Standard Material/Coating

/AP Stainless Steel, Passivated

snhy.com/CKIV

TECHNICAL FEATURES

There is a positve seal between ports 2 and 3.

Pilot pressure as low as 75 psi (5 bar) higher than the pressure at the vent can prevent the valve from closing.

Atmospherically referenced pilot-to-open check valves are considered problem solvers for existing circuits using non-vented valves. However, the atmospherically

referenced valve will eventually leak externally or allow moisture into the spring chamber. Four-port vented pilot-to-open check cartridges are recommended for new

applications.

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

Approximately 1 drop (0,07 cc) of fluid will pass from the pilot area to the vented spring chamber every 4000 cycles.

For models with manual load release control option, turn load release clockwise to release load.

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

Model Code Example: CKIVXCNCONFIGURATION OPTIONS

Created on 09/21/2015

 2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2

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.

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