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Pilot operated pressure relief valve, types ZDB/Z2DB 10V..L4XPressure relief valve types ZDB and Z2DB are pilot operated and sandwich structure. They are used to limit the pressure in a hydraulic system.They basically consist of the housing (7), together with one or two pressure relief valves cartridges. And the system pressure is set by means of relief valve (4).At static position, the valves are closed. Pressure in port A acts on the spool (1). Pressure fluid flows through orifice (2) to the spring loaded side of the spool (1) and through orifice (3) to the pilot poppet (6). If the pressure