Sun Hydraulics' pilot-to-open check cartridges are non-modulating, on-off devices used for holding a load or actuator in position. Sun pilot-to-open check cartridges can be directly integrated into your actuator or applied using manifolds with many mounting options.

  • Offer protection against hose breaks
  • Positively lock pressurized loads
  • Are available in non-vented (3-port) and vented (3- and 4-port) versions
  • Are physically interchangeable with counterbalance cartridges (same number of ports, same cavities, same flow path for a given frame size).
POC-PO.jpg

Pilot Operated

  • Maximum operating pressure = 5000 psi
  • Maximum valve leakage = 1 drop/min.
  • CKBB, CKBD available only with 30 psi or 75 psi check valve cracking pressures.
  • CK*D has sealed pilot for use in circuits where cross port leakage is undesirable.
  • CK*B has unsealed pilot to allow air trapped in the pilot line to be purged from the circuit.
POC-AR3PC.jpg

Atmospherically Referenced, 3 Port Cavity

  • Maximum operating pressure = 5000 psi
  • Maximum valve leakage = 1 drop/min.
  • Approximately 1 drop of fluid will pass from the pilot area to the vented spring chamber every
  • 4000 cycles.
POC-V4PC.jpg

Vented, 4 Port Cavity

  • Maximum operating pressure = 5000 psi
  • Maximum valve leakage = 1 drop/min.
  • Port 4 (vent) should never be blocked as seal weepage will eventually cause valve to malfunction.
  • Will accept pressure at port 4 (vent) but cannot exceed 5000 psi.