A fluid-pressure-regulating valve device including adjusting means for setting the device to deliver fluid at a selected pressure,Forged Steel Valves piston-operated valve means for controlling and maintaining delivery of fluid at the preselected pressure level,Reducing Valves the piston for operating said valve means being normally biased in one direction by an adjustable force for opening said valve means and being subject to supply fluid pressure acting thereon in opposition to said adjustable force for closing said valve means when the delivered pressure attains said preselected pressure sufficient for overriding said adjustable force venturi means in the supply communication for causing the pressure of supply fluid acting on the piston to be reduced to a lesser degree than the delivered pressure for thereby affecting the piston to maintain the valve means in its fully open position until the preselected pressure is attained,WATER POWER CONTROL VALVE and means for effecting balance of pressure on both sides of the valve means for rendering the piston more sensitive to any change in the degree of delivered pressure when the valve means is closed.

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