Description Size 32 … 50 Component series 2X Maximum operating pressure 420 bar Maximum flow 4500 l/min Features 2/2-directional cartridge valve Pilot control valve: proportional directional valve Main stage with position control Normalized: - Installation dimensions according to ISO 7368 Flexible: – Suitable for position, pressure, force and velocity control Typical applications: - Presses - Die casting machines - Nibbling axes Product description Valves of type 2WRCE are pilot-operated, 2-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: 1-stage pilot control valve (1) with two solenoids as electro-mechanical converters and a control spool that is connected to the integrated pilot electronics (6.2) via electrical feedback Second stage (2) for flow control An inductive position transducer (3) the core (4) of which is attached to the main control spool (5) of the second stage Integrated electronics (OBE) (6.1). Function The integrated electronics (OBE) compares command and actual values and the solenoids of the pilot control valve (1) are actuated with a proportional current according to the control deviation. The pilot control valve (1) takes a proportionally controlled position and controls the flow in and out of the control chambers A (7) and B (8) that actuate the main control spool (5) through the closed valve control loop up to 0 control deviation. This means that the stroke of the main control spool (5) 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 5% 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 valve dynamics 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 5% (= 0.5 V or 0.5 mA) is set at the factory. Due to the internal setting of the pilot control valve, the pilot pressure is connected to control chamber B (8) in case of a power failure, i.e. the main stage is closed. The control electronics feature an offset setting to compensate pilot trimming. Due to differences in diameter in the seat range, the control spools are statically not pressure-compensated. To compensate the force differential, 6% of the system pressure is required for version "L" and 22% of the system pressure is required for version "R" as pilot pressure. With reserves for flow force and dynamics, this defines the recommended minimum pilot pressure. Notice: Preferably, port B is to be connected to the actuator. Type code 01 02 03 04 05 06 07 08 0
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