Description Size 10 … 25 Component series 1X Maximum operating pressure 350 bar Maximum flow 870 l/min Nominal flow 50 … 350 l/min Features Pilot-operated high-response directional valve, 2-stage, with electrical position feedback of the main control spool and integrated electronics (OBE) It is suitable for the position, pressure, force and velocity control when there are simultaneously high requirements on the dynamics in the small signal range and the response sensitivity Pilot control valve: single-stage servo valve according to nozzle/flapper plate principle Position sensing of the main control spool by means of an inductive position transducer High response sensitivity and low hysteresis Replaceable filter element Integrated control electronics, external zero point correction possible For subplate mounting: Porting pattern according to DIN 24340 form A and ISO 4401 Product description The 4/3 directional high-response valve is designed for subplate mounting, with position control and integrated control electronics. It controls the flow proportionally to the input signal, continuously from P to B and A to T or also from P to A and B to T. Set-up: The valve consists of four main assemblies: low-friction pilot control valve (1) with dry 2-gap torque motor; valve housing (2) with orifices (3) and filter (4) Housing of the main stage (5) with spring-centered control spool (6) Control electronics (7) with amplifier to control the pilot control valve (1) and for the position control of the main control spool (6) inductive position transducer (8) for position sensing of the main control spool (6) Control of the pilot control valve by means of a command value from 0 to ±10 V or from 0 to ± 10 mA Comparison command/actual value in the control electronics → In case of control deviation, the torque motor will be activated and the flapper plate will be deflected according to the control amplitude. Detuning of the control pressures using the control and fixed orifices → Deflection of the main control spool (6) Achievement of the position of the main control spool according to the command value presetting → Control deviation has been reduced to almost 0 V → Control process is completed Pilot oil supply to the pilot control valve internally via port P or externally via port X Pilot oil drain internally via port T or externally via Y to the tank Functional description: Notice: In case of supply voltage failure, however with available operating pressure, the main control spool (6) will take an undefined position. The acceleration forces occurring in this connection may cause machine damage. If a directional sandwich plate valve is used, the two control lines in the main stage will be short-circuited in case of power failure. With control spool form E, E1- and Q2-, the centering spring (9, 10) bring the main control spool (6) in central position, V- and V1 control spools are switched to preferred direction P to B and A to T in a tolerance range of 1% to a maxi
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