Type 4WMMH …
Valves of type H–.WMDH are directional spool valves with mechanical-hydraulic actuation. They control the start, stop and direction of a flow.
The directional valves basically consist 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 function of the valves corresponds to the function of valves of type WPH. The pilot control valve is, however, actuated mechanically.
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” throttle insert must be provided in port P of the pilot control valve.
- in connection with version “H-”, the “D3” pressure reducing valve (see Pressure reducing valve) has to be installed in addition.
