The Inbal Pilot operated pressure reducing System designed to maintain a predetermined outlet pressure which remains steady and unaffected by the changing of inlet pressure, is  installed in the portions of the system where there is potential for normal conditions of water pressure in excess to the pressure required or when the system pressure is designed for full capacity but there is a potential of partial operations causing the pressure to increase in the fire protection system. 

The Inbal Automatic Water Control Valve used in the pressure reducing system is a pressure operated, sleeve actuated, Axial Valve with the unique reliable N.M.M.P. (No Moving Mechanical Parts) design in which the only moving part when the Inbal Valve operates, is the reinforced sleeve which forms a drip-tight seal with the corrosion resistant core, preventing false operation due to transient surges in water supply pressure.