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The ZDC valves are direct operated meter-in pressure compensators of 2 or 3-way design.
They are used for the load compensation as a meter-in pressure compensator in channel P.
These valves basically consist of the housing, the
control spool, compression spring with spring washer and the cover with integrated shuttle valve.
The compression spring holds the control spool in the open position from P1 to P,when the pressure differential P1 to A1 or P1 to B1 is less than 1.0 MPa. If the pressure differential exceeds 1.0 MPa, then the control spool is moved to the left until the pressure differential is restored.

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