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The Duplomatic ZC2 balancing valves act as pressure reducing valves that, besides reducing the pressure from line P to user A, allow the flow to return from user A to discharge T when a pressure greater than the set value is generated in the downstream circuit (user A). (A typical case of hydraulic counterweight or load balancing)
They have a mounting surface in accordance with ISO 4401 (CETOP RP121H) standards. Port B is never used.