Created on 12/08/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
CKGI
Vented pilot-to-open check valve with external pilot port, sealed pilot, and stem
seal
SERIES 3 / CAPACITY: 240 L/min. / CAVITY: T-17A
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 external 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 references the vent
(port 3).
TECHNICAL DATA
Cavity T-17A
Series 3
Capacity 240 L/min.
Pilot Ratio 3:1
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 0,07 cc/min.
Valve Hex Size 31,8 mm
Valve Installation Torque 203 - 217 Nm
Seal kit - Cartridge Buna: 990017007
Seal kit - Cartridge Polyurethane: 990017002
Seal kit - Cartridge Viton: 990017006
Model Weight 0.59 kg.
(S)CONTROL
S External 4-SAE Pilot Port, Vent to Port
3
V External 1/4 NPTF Pilot Port, Vent to
Port 3
(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
snhy.com/
CKGI
Model Code Example: CKGISCNCONFIGURATION OPTIONS
Created on 12/08/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
F 100 psi (7 bar)
TECHNICAL FEATURES
There is a positve seal between ports 2 and 3.
These valves should be considered service items only. New applications should use valves from the CV*V family.
Pilot pressure as low as 75 psi (5 bar) higher than the pressure at the vent can prevent the valve from closing.
Pilot-to-open check cartridges are locking valves, not motion control valves. For motion control applications, use counterbalance valves.
Extremely low leakage. If the load drifts due to the valve, the seat has probably been damaged by contamination and the valve should be replaced.
This 3 port pilot-to-open check valve is not physically interchangeable with other 3 port pilot-to-open check valves or counterbalance valves due to the different
pilot/vent configuration.
This valve is a direct replacement for the CK*E, CK*F, CKEG, and CK*H and uses components from the new vented design. It does not have the proportional
pressure reducing characteristic. Note: Replacing the older design with this valve can result in a 33% increase in pressure at the actuator.
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.
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
