The directional seated valves type WN and WH are of compact design and feature 2/2-, 3/2-way functions. 2/2-, 3/2-way functions are possible by combining two individual valves on one joint sub-plate.
All functionally important components, from the solenoid armature to the valve elements, are lubricated by the hydraulic fluid, therefore no maintenance is required.
Type WN is only available as size 1. The armature cavity is pressure resistant up to 300 bar and directly connected to port R. This means that between the solenoid armature and the valve elements only a simple pin (with no seal) is required. This results in a very long service life (no seal wear). The solenoid force is largely dependent on the respective pressures to be switched. This often enables operation with reduced supply voltage thereby reducing the solenoid temperature and increasing its service life.
Additionally to the directional seated valve versions of type WN, there is also a 4/2-way directional spool valve available (pmax = 300 bar).
Type WH features an actuation pin between solenoid armature and valve elements which is sealed and shaped in such a way, that the solenoid force is supported by an additional hydraulic force. This enables pressure up to 450 bar (WH 1) or 350 bar (WH 2, 3 and 4) to be achieved.