Pressure relief cartridge valves
Series DVPA-3-10… cartridges are 2-stage pressure relief valves with a positive seat pilot stage and spool-type main stage. When the pilot stage is active (main stage relieving), pilot oil is externally drained to port Z. Port B can therefore be subjected to pressure without influencing the valve’s pressure relief setting. When used to provide a pressure sequence function, the pilot oil consumption increases (see pA-Q curves overleaf). Thoroughly oil or grease external seals before inserting the cartridge in a DD cavity. The cartridge can be tightened with a 27 A/F OE spanner (note the recommended tightening torque). Form tools are available for sale or hire, should customers wish to machine cavities in their own control blocks.