This invention relates to improvements in and relating to a safety valve assembly, especially to be fitted in the hydraulic brake system for wheels of an automotive vehicle,WATER POWER CONTROL VALVE although the invention may find its application in other uses in a hydraulic pressure piping system. The safety valve assembly is adapted for operation to close the hydraulic pressure piping system when the outlet liquid quantity exceeds the inlet liquid quantity over a certain predetermined degree. This feature is especially valuable to interrupt oil outlet,Forged Steel Valves when, as an example, a burst or the like cause should take place in the brake piping system.  A safety valve assembly comprising a pair of safety valve elements, each of the latter comprising a stationary valve body housing, an inlet port, an outlet port,Safety Valves said ports being formed in said body, an axial bore formed in said body, a stepped piston having a larger part and a smaller part slidably mounted in said bore, a first chamber formed within said bore and defined in part by said larger piston part, means for fluidically connecting said inlet port with said first chamber for admitting hydraulic pressure to shift said piston in one direction, a second chamber formed within said bore and defined in part by said smaller piston part, spring means acting upon said piston so as to oppose hydraulic pressure in said first chamber, fluid passage means formed in said piston for fluid communication between said inlet port and said outlet port, a variable orifice means for throttling fluid flow from said inlet port to said outlet port responsive to movement of said piston in said one direction, locking means for locking said piston when said piston is disposed in a position in which said fluid passage means is completely closed when the pressure differences as measured between said inlet port and said outlet port is larger than a predetermined value and additional fluid passage means for connecting said inlet port of one of said safety valve elements with said outlet port of the other of said safety valve elements when said piston of said one of said safety valve elements is locked by said locking means.

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