Hydraulic directional spool valve operation function reply on the spool structure and spool position. There are three spool position of WH series:Ordering code of WH means: the spool maintain in the central or initial position when there is no pressure in side the valve house.Ordering code of WH /O means: there is no spring and locating device inside the valve, the spool is mounted with control plungers. The spool position is fixing if there is no pressure in the tunnel of valve house.The code WH /OF means: there is no spring, one locating device inside the valve, the spool is mounted with control plungers. The spool position is fixing if there is no pressure in the tunnel of valve house. Please inform us before ordering the WH series for the spool different position.Hydraulic directional spool valve controls the fluid by a spool position and the spool is powered by hydraulic oil. There is a reducing valve can be mounted if the operated pressure above 250bar. We produce the spool by precisely CNC grinding machine keeping the  spool  concentricity and outside dimensions precision, it is stable of working and lower hydraulic switching shock.Ordering code:FT-4WH16 E–50/   (1)(2)(3)(4)(5)(6)(7)(8)(9)(1) Producer code

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