Created on 07/06/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
COJA
Pilot-to-close check valve
SERIES 4 / CAPACITY: 610 L/min. / CAVITY: T-19A
This valve is a spring biased closed, pilot-to-close check cartridge that has a 1.8:1 pilot ratio. The valve allows flow
from port 1 to port 2 and blocks reverse flow. Pressure at the pilot port opposes pressure at port 1 at a ratio of
1.8:1. This valve is most often used in regeneration circuits.
TECHNICAL DATA
Pilot Ratio 1.8:1
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
(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)
G 150 psi (10,5 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
snhy.com/
COJA
TECHNICAL FEATURES
Nominal pilot ratio is 1.8:1. This means that a pressure of 1000 psi (70 bar) at the pilot port will close a valve against a pressure of 1800 psi (125 bar) at port 1. Any
decay or loss of pilot pressure could allow the valve to open, even if it is a momentary decay or loss.
Pressure at the port 2 area directly opposes pilot pressure.
Reverse flow through the valve from port 2 to port 1 is not possible under any condition.
With equal pressures at all ports the valve is closed.
In the begining the CO*A's did not have a positive seal on the pilot pistons and the CO*B's did. Now the CO*A's are positively sealed and the 2 valves are
mechanically identical. CO*A's are more readily available and cost less.
Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP or /LH (see CONFIGURATION
section). For further details, please see the Materials of Construction page under TECHNICAL 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.
Model Code Example: COJAXCNCONFIGURATION OPTIONS
Created on 07/06/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
PERFORMANCE CURVES
