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Diaphragm type adjustable pressure reducing/sustaining valves is installed infeeding/draining water system in high building to reduce the inlet pressure required pressure.The valves ensure outlet pressure stay in the setting valves stably on its own energy,namely the outlet pressure does not change owing to the inlet pressure's and flow's change.There is self-cleaning filtering mesh installed at the valves control
system's inlet not to let the great specific gravity and large diameter particle flow in to the system and ensure the system is unimpeded.The valves acts quickly and has a long life.

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