Directional spool valves, pilot operated, with hydraulic-hydraulic actuation H-.WHH

Description Size 10, 16, 25 (4W.H22), 25 (4W.H25), 32 Component series 4X, 7X, 6X Maximum operating pressure 350 bar Maximum flow 1100 l/min Features Type of actuation: hydraulic-hydraulic For subplate mounting Porting pattern according to ISO 4401 Subplates according to data sheets 45054 to 45060 (separate order) Spring centering, spring end position or hydraulic end position Optional auxiliary operating device Switching time adjustment, optional Preload valve in channel P of the main valve, optional Stroke setting at main spool, optional Stroke setting and/or end position control, optional Inductive position switch and proximity sensors (contactless) Product description Type 4WPH … Valve type H–.WHH is a directional spool valve with hydraulic-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). 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 (5) and (7) are connected with the tank in a depressurized form via the pilot control valve (4). The pilot control valve (4) is supplied with pilot oil via the control line (6). Supply can be implemented internally or externally (externally via port X). Upon actuation of the pilot control valve, e. g. side "a", the pilot spool (8) is moved to the left and thus, the spring chamber (7) is pressurized with pilot pressure. The spring chamber (5) 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. When de-energized, the control spool (8) is held in the central position or in the initial position by the return springs (9) (except impulse spool). The spring chamber (7) is unloaded to the tank. The pilot oil from the spring chamber is displaced into channel Y via the pilot control valve (4). The pilot oil supply and return are implemented internally or externally (externally via port Y). Pilot oil supply NG10 Pilot oil supply NG16 Pilot oil supply NG25 (type 4W.H 22 .7X/…) Pilot oil supply NG25 (type 4W.H 25 .6X/…) Pilot oil supply Size 32 Attention! The pilot oil supply may only be modified by authorized specialists or at the factory! – External pilot oil supply X or return Y : with NG10, version SO30 has to be used if sandwich plates are installed. The identification SO30 has to be used at the end of the type designation (sandwich plate). the maximum admissible operating parameters of the pilot control valve must be observed! maximum pilot pressure: please observe Technical data! – Internal pilot oil supply (version “ET” and “E”): minimum pilot pressure: please observe Technical data! to prevent inadmissibly high pressure peaks, a “B10” thr