Description Size 16 … 25 Component series 1X Maximum operating pressure 350 bar Maximum flow 650 l/min Features 4/3, 4/2 directional design Types of actuation (internal or external pilot control): – Electro-hydraulic (type WEH) – Hydraulic (type WH) For subplate mounting Porting pattern according to ISO 4401 Spring centering, spring end position DC solenoid Electrical connection as individual connection Manual override Product description Type WEH The valve type WEH is a directional spool valve with electro-hydraulic actuation. It controls the start, stop and direction of a flow. The directional valve basically consists of the main valve with housing (1), the main control spool (2), one or two return springs (3.1) and (3.2), as well as the pilot control valve (4) with one or two solenoids "a" (5.1) and/or "b" (5.2). The main control spool (2) in the main valve is held in the zero or initial position by the springs or by means of pressurization. In the initial position, the two spring chambers (6) and (8) are connected with the tank in a depressurized form via the pilot control valve (4). Via the control line (7), the pilot control valve is supplied with pilot oil. Supply can be implemented internally or externally (externally via port X). Upon actuation of the pilot control valve, e.g. solenoid "a", the pilot control spool (10) is moved to the left and thus, the spring chamber (8) is pressurized with pilot pressure. The spring chamber (6) remains depressurized. The pilot pressure acts on the left side of the main control spool (2) and moves it against the spring (3.1). This connects port P with B and A with T in the main valve. On switching off of solenoid, the pilot control spool (10) returns to its initial position. The spring chamber (8) is unloaded to the tank. The pilot oil return is implemented internally (via channel T) or externally (via channel Y). An optional manual override (9) allows for moving of the pilot control spool (10) without solenoid energization. Notice: The return springs (3.1) and (3.2) in the spring chambers (6) and (8) hold the main control spool (2) in central position without pilot pressure even with, for example, vertical valve positioning. Due to the design principle, internal leakage is inherent to the valves, which may increase over the life cycle. Type WH Valve type WH is a directional spool valve with hydraulic actuation. It controls the start, stop and direction of a flow. The directional valve basically consists of the valve housing (1), the main control spool (2), one or two return springs (3.1) and (3.2) at valves with spring return or spring centering as well as the diversion plate (11). The main control spool (2) is actuated directly by pressurization. The main control spool (2) is held in zero or initial position by springs or pressurization. Pilot oil supply and return are external (see page 9). 4/3 directional valve with spring centering of the control spool With this version, the main control spool (2)
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