SystemStak™ Pilot Operated Check Valves
These valves are single or dual check units. Dual check units have identical check elements located in the “A” and “B” cylinder port lines. The check valve poppets are moved into the open position by a central pilot control spool which moves toward one check or the other, depending on which port is pressurized.
The check valve located in the return circuit is opened by the operating pressure in the primary circuit. When the pressure in the pilot line is vented, the check valve will remain closed.
The pilot spool area to valve seat ratio is 3:1 on standard models, and 20:1 on models with the decompression feature.
Check valve cracking (opening) pressures of 1 bar (15 psi), 2,5 bar (36 psi) and 5 bar (73 psi) are available.
SystemStak™ Direct Check Valves
These SystemStak valves are self-operating, spring loaded, poppet type single or dual check units.
Location of the check element can be in the “A”, “B”, “P” or “T” port.
A check in the “P” port is available as a “Y” single check model only.
A check in the “T” port is available as an “X” single check model only.
The dual check unit has identical check elements in both the “A” and “B” ports.
Check valve cracking (opening) pressures of 1 bar (15 psi), 2,5 bar (35 psi) and 5 bar (75 psi) are available.