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Pressure reducing valve, direct operated, type ZDR10D...40

Pressure reducing valves type ZDR10D.. are 3-way direct operated pressure reducing valves of sandwich plate design with a pressure reducing function on the secondary side. It is used to reduce the system pressure. The pressure reducing basically consists of the housing (1), the control spool (2), one or two compression spring (3)and the adjustment element (4) as well as with an optional check valve.
At static state, the valve is normally open, fluid can flow free from port P2 to port P1 (version "DP") or port A1 to port A2 (version "DA"). Pressure in port P1 acts at the spool area (6) via control line (5) and is balanced with the setting value of the compression spring. When the pressure in port P1 exceeds the setting value of the spring (3), the control spool (2) moves further towards the compression spring (3), the opening aperture at port P is getting smaller until fluid at port P1 flows back to tank via the control land (7) to prevent any further rise In pressure. The leakage oil in spring chamber (8) is always drained to tank via port T.
A check valve can be fitted optionally in version "DA" for free flow from ports A2 to ports A1.
A pressure gauge connection (9) permits the secondary pressure to be monitored.

ZDR10D...40.pdf

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