Created on 06/22/2015

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

MODEL

CVCV

Vented pilot-to-open check valve

SERIES 1 / CAPACITY: 60 L/min. / CAVITY: T-21A

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) 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 to the vent (port

4).

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: 990-021-007

Seal kit - Cartridge Polyurethane: 990-021-002

Seal kit - Cartridge Viton: 990-021-006

(X)CONTROL

X Standard Pilot

L Manual Load Release

(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

/LH Mild Steel, Zinc-Nickel

snhy.com/

CVCV

TECHNICAL FEATURES

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

Will accept pressure at port 4 (vent) but can not exceed 5000 psi (350 bar).

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

Four-port pilot-to-open check cartridges and four-port counterbalance cartridges 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.

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

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.

Port 4 (vent) should never be blocked as seal weepage will eventually cause valve to malfunction.

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.

Model Code Example: CVCVXCNCONFIGURATION OPTIONS