Created on 06/30/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
COBA
Pilot-to-close check valve
CAPACITY: 40 L/min. / CAVITY: T-163A
This valve is a spring biased closed, pilot-to-close check cartridge that has a 3:1 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 3:1.
This valve is most often used in regeneration circuits.
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: 990-163-007
Seal kit - Cartridge Polyurethane: 990-163-002
Seal kit - Cartridge Viton: 990-163-006
(X)CONTROL
X Standard Pilot
B External 1/4 BSPP Pilot Port, Port 3
blocked
(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/COBA
TECHNICAL FEATURES
Features hardened steel seats for excellent wear characteristics and contamination tolerance.
Product is not available with A and B spring ranges (4 and 15 psi (0,3 and 1 bar)).
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.
Nominal pilot ratio is 3:1. This means that a pressure of 1000 psi (70 bar) at the pilot port will close a valve against a pressure of 3000 psi (205 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.
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
Model Code Example: COBAXCNCONFIGURATION OPTIONS
Created on 06/30/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
