Description Size 63 … 160 Component series 1X Maximum operating pressure 420 bar Maximum flow 50000 l/min Features 2-way cartridge valve Pilot control valve: 2-stage directional servo valve Position sensing of the control spool by means of an inductive position transducer Normalized: - Installation dimensions according to ISO 7368 Control spool in seat or spool design External control electronics or integrated electronics (OBE), optional Typical applications: – Forging manipulators – Press cylinders – Die casting machines Product description Valves of type 2WRC(E) are pilot-operated, 3-stage directional high-response cartridge valves. They control the quantity and direction of a flow and are mainly used in control loops. Set-up The valves consist of the following assemblies: 2-stage pilot control valve (1) with dry torque motor low-friction nozzle flapper plate amplifier mechanical feedback of the control spool position Main control spool (2) for flow control An inductive position transducer (3) the core (4) of which is attached to the main control spool (2) of the third stage External control electronics or integrated electronics (OBE) (5). Function In the control electronics, command and actual values are compared and the torque motor of the pilot control valve is actuatedn with a proportional current according to the control deviation. The pilot control valve (1) takes a proportionally controlled position and controls the flows in and out of the control chambers A (6) and B (7), which actuate the main control spool (2) through the closed valve control loop up to 0 control deviation. This means that the stroke of the main control spool (2) is regulated proportionally to the command value. It must be noted that the flow also depends on the valve pressure drop. Valve features The flow can pass through the valve from A to B or from B to A. The control spool (seat design) closes or opens at 2% of the command value. At lower command values, the valve control loop attempts to guide the control spool, thus presses it onto the seat at full pilot pressure and blocks the connection in a leakage-free way. The specified switching times only apply to the control area of the valve. At command value steps from the seat to lower opening values, additional delay times occur. The opening point of 2% (= 0.2 V) is set at the factory. When the pilot control valve (1) or the control electronics is exchanged, the opening point can be readjusted by shifting the position transducer coil (3) by means of the nut (SW13). Notes: Power failure at the pilot control valve leads to an undefined position of the main control spool (2). Preferably, port B should be connected to the actuator. Type code 01 02 03 04 05 06 07 08 09 10 2 WRC ‒ 1X / S / * 01 2 main ports 2 02 Directional high-response cartridge valve, pilot-operated WRC 03 For external analog electronics no code With integrated electronics (OBE) E 04 Size 63 63 Size 80 80 Size 100 100 Size 125 125 Size 160 160 Control
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