Created on 12/08/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
COJB
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
Cavity T-19A
Series 4
Capacity 610 L/min.
Pilot Ratio 1.8:1
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 0,07 cc/min.
Valve Hex Size 41,3 mm
Valve Installation Torque 474 - 508 Nm
Seal kit - Cartridge Buna: 990019007
Seal kit - Cartridge Polyurethane: 990019002
Seal kit - Cartridge Viton: 990019006
Model Weight 1.18 kg.
(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)
Z 1 psi (0,07 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
snhy.com/COJB
Model Code Example: COJBXCNCONFIGURATION OPTIONS
Created on 12/08/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
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.
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
