Pressure relief valve with solenoid operated

Features of hydraulic pilot operated pressure relief valves:

-Subplate mounting

-Pipe connection

-Insert connection

-Three adjustment elements:

. Rotary knob

. Hex. head screw with protective cap

. Lockable rotary knob with scale

-Solenoid operated unloading via a built-in directional spool valve

Functional description of hydraulic pilot operated pressure relief valves:
General

         Types DB and DBW pressure valves are pilot operated pressure relief valves.

         They are used for the limitation (DB) or limitation and solenoid actuated unloading (DBW) of the control pressure.

         The pressure relief valves (DB) consist mainly of the main valve (1) with main spool assembly (3) and pilot operated valve (2) with pressure adjustment element.
Pressure relief valve type DB:
          The pressure presents in port A acts on the main spool (3) At the same time pressure is applied via the control lines (6) and (7), which are fitted with orifices (4) and (5), on the spring loaded side of the main spool (3) and at the poppet(8) in the pilot control valve (2). If the pressure in port A exceeds the value set at the spring (9), the poppet (8) opens against the spring (9).

          The signal for this comes internally via the control lines (10) and (6) from port A. The pressure fluid on the spring loaded side of the main spool (3) now flows via the control line (7), orifice bore (11) and poppet (8) into the spring chamber (12). In type DB...30/... it flows internally via the control line (13) to tank, or in type DB..30/..Y.. externally via the port Y. Due to the orifices (4) and (5) a pressure drop occurs at the main spool (3), the connection from port A to port B is open. Now the pressure fluid flows from port A to port B while maintaining the value set operating pressure.

         The pressure relief valve may be unloaded or switched over to a different pressure (second pressure stage) via port "X" (15).

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