4CKKT Series Dual Pilot Operated Cartridge Check Valve With Thermal Relief, 4000.00 PSI Pressure Setting, 3:1 Pilot Ratio

Designed for lock valve circuits requiring thermal protection, this cartridge-style valve suits installation in actuators, manifold blocks, and Hydraulic Integrated Circuits. The 4CKKT Series Dual Pilot Operated Cartridge Check Valve With Thermal Relief, 4000.00 PSI Pressure Setting, 3:1 Pilot Ratio is a Danfoss Hydraulics product rated to 4,350 psi maximum with a 6.6 gpm flow capacity and a -22° to +194°F operating temperature range. It features a hardened and ground poppet for positive sealing and extended service life, with nitrile seals as standard.

The dual pilot operated design allows free flow to a cylinder while blocking reverse flow until pilot pressure is applied, effectively holding a load in position without leakage when the control valve is in neutral. A 3:1 pilot ratio unlocks the circuit at 25% of locked pressure for single-acting cylinders. Internal leakage is rated at 5 drops per minute maximum between ports 1 and 2. Installation requires a machined C-10-4 cavity, torqued to 22 ft-lbs. Recommended filtration is ISO level 18/13 or better. Housings with pressures over 3,000 psi require steel construction.

SKU: 401AA00011A

Supplier Part Number (MPN): 401AA00011ASP

Alternate Part Numbers: 4CKKT503S328, C1JZ75