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4CKKT Series Dual Pilot Operated Cartridge Check Valves With Thermal Relief, Up To 4350 PSI & 6.6 GPM

Application Pilot check valves allow flow to pass in one direction, with a low pressure drop, then prevent reverse flow until pilot pressure is applied. There are many applications for this valve type, the most common being to lock and hold a cylinder, or another hydraulic actuator, in position. A pilot relief valve will protect the cylinder and hoses from thermal expansion of the hydraulic fluid. See Introduction to Pilot-Operated Check Valves (Lock Valves) at the beginning of this section.
Features Hardened and ground poppet gives excellent flow capability for valve size, positive sealing and long working life. Cartridge construction allows installation in actuators, manifold blocks and Hydraulic Integrated Circuits. Requires a machined C-10-4 cavity or housing for installation.
Installation 22 ft-lbs torque cartridge into cavity. Unrestricted mounting position. For compatible C-10-4 bodies see
Recommended Filtration ISO level 18/13 or better.
Specifications 6.6 gpm rated flow. 4350 psi maximum setting. CAUTION: Pressures over 3000 psi require a steel housing. -22° to +194°F operating temperature range. 5 drops per minute max internal leakage between ports 1 and 2. 15 drops per minute max internal leakage between ports 3 and 4. Based on oil temperature of 104°F and 150 SSU.
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