Proportional directional valve, direct operated, with electrical position feedback and integrated electronics (OBE) 4WREE-3X

Description Size 6 Component series 3X Maximum operating pressure 350 bar Maximum flow 80 l/min Nominal flow ( Δp = 10 bar) 4 … 32 l/min Features 4/2 or 4/3 directional design For subplate mounting Porting pattern according to ISO 4401-03-02-0-05 Control of flow direction and size Actuation by proportional solenoids with central thread Spring-centered control spool Integrated control electronics (OBE) with voltage or current input ("A1" or "F1") Product description The type 4WREE valve is a direct operated proportional directional valve with electrical position feedback and integrated electronics (OBE). Set-up The valve basically consists of: Housing (1) with connection surface Control spool (2) with compression springs (3 and 4) and spring plate (5 and 6) Solenoids (7 and 8) with central thread Position transducer (9) Integrated electronics (13) Electric zero point adjustment (12) accessible via the rubber plug Function With de-energized solenoids (7 and 8), central position of the control spool (2) by compression springs (3 and 4) between spring plates (5 and 6) Direct operation of the control spool (2) by controlling a proportional solenoid, e.g. solenoid "b" (8) Displacement of the control spool (2) to the left proportional to the electric input signal This opens the connection from P to A and B to T via orifice-type cross-sections with progressive flow characteristic In the de-energized condition, the control spool (2) is held in a mechanical central position by the return springs of the solenoids. With control spool symbol "V", this position does not correspond to the hydraulic central position! When the electric valve control loop is closed, the control spool is positioned in the hydraulic central position. Valve with 2 spool positions (version "4WREE…A…") The function of this valve version basically corresponds to the valve with three spool positions. The 2 spool position valves are, however, only equipped with solenoid "a" (7). Instead of the 2nd proportional solenoid, there is a plug screw (10). Pressure compensation element in the OBE "-967" To prevent condensate formation in the housing of the integrated electronics (OBE), an electronics protection membrane (11) can be used. Recommended for use outside industry-standard conditions with high ambient air humidity and significant cyclic temperature changes (e. g. outdoors). Notes: Due to the design principle, internal leakage is inherent to the valves, which may increase over the life cycle. The tank line must not be allowed to run empty. With corresponding installation conditions, a preload valve (preload pressure approx. 2 bar) must be installed. The PG fitting (14) must not be opened. Type code 01 02 03 04 05 06 07 08 09 10 11 12 13 4 WRE E 6 - 3X / / 24 01 4 main ports 4 02 Proportional directional valves, direct operated, with electrical position feedback WRE 03 With integrated electronics (OBE) E 04 Size 6 6 05 Symbols; for the possible version, see "Symbols/Circuit diagrams" e.g.