Description Size 10 Component series 2X Max. operating pressure 315 bar Flow, max. 80 l/min Features Pilot-operated proportional valve for system pressure reduction Operation by rotatable proportional solenoid Sandwich plate design Porting pattern according to DIN 24340 form A and ISO 4401 4 pressure ratings Valve and control electronics from a single source External control electronics for type ZDRE Linear pressure/command value characteristic curve Integrated electronics (OBE) with little manufacturing tolerance of the command value pressure characteristic curve with type ZDREE Product description Valves of type ZDRE... are pilot-operated pressure reducing valve in sandwich plate design and 3-way version, i. e. with pressure limitation of the actuator pressure. They are used for reducing a system pressure. They mainly consist of pilot control component (1) with proportional solenoid (2), main valve (3) and control spool (4). The pressure in channel P1 is set in a command value-dependent form via the proportional solenoid (2). In rest position, i. e. without pressure in channel P2, the control spool (4) opens the connection from channel P2 to P1. The pressure in channel P1 acts on the spool face (6) via the bore (5). The pilot oil for the pilot valve is taken from channel P1 and flows via the bore (5) and the nozzle (7) into the spring chamber (8). From there, it flows back to the tank via the valve seat (9), the bore (10) and the Y line. The pressure required in channel P1 is preset at the related amplifier. The proportional solenoid moves the valve poppet (11) in the direction of the valve seat (9) and increases the pressure in the spring chamber (8). In this way, the two chambers (6) and (8) are pressure-compensated and the compression spring (12) moves the piston (4) to the right in opening direction P2 to P1. As soon as the actuator pressure P1 has increased to the value set at the pilot valve, the valve poppet (11) opens and limits the pressure in the spring chamber (8). The control spool (4) now moves to the left in control position. If the actuator pressure P1 exceeds the value set at the pilot valve, the control spool is moved further to the left. It blocks the flow from P2 to P1 and opens the connection from P1 to tank TA1 at the control edge (13) until the pressure has dropped again to the set value. Valves of type ZDREE... are pilot-operated pressure reducing valves in sandwich plate design and 3-way version, i. e. with pressure limitation of the actuator pressure. They are used for reducing a system pressure. They mainly consist of pilot control component (1) with proportional solenoid (2), main valve (3) and control spool (4). The control electronics (OBE) in the housing (14) maintain the supply and command value voltage via the mating connector. At the factory, the command value pressure characteristic curve is adjusted with little manufacturing tolerance. The pressure in channel P1 is set in a command value-dependent form via the
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