A safety valve has a valve body defining a valve chamber having a longitudinal axis with flow passages at opposite ends of the axis, transverse walls at opposite ends of the valve chamber separating the valve chamber from the flow passages, valve ports through the transverse walls coaxial with the valve chamber,Safety Valves at least one of the valve ports being defined by a frusto-conical valve seat facing the valve chamber and by a cylindrical inner surface between the valve seat and the side of the one valve port opposite the valve chamber, an annular groove formed in the cylindrical surface of the one valve port,Plug Valves a convolute coil spring having a large end coil seated in the annular groove and a small end axially removed from the large end in the direction of the valve chamber and located within the confines of the valve seat,MULTI-FUNCTIONAL WATER PUMP CONTROL VALVE a ball valve of small diameter than the valve chamber disposed in the chamber and movable toward and away from the seat, and a leak passage for bypassing a restricted flow of fluid around the valve when the valve is closed. In one embodiment of the invention both valve ports are similarly defined and both include convolute coil springs so that the valve may operate bidirectionally. In another embodiment, the valve is designed for unidirectional use, however the valve body is generally the same as in the first embodiment except that the convolute spring and seat for same are omitted from the upstream valve port, and in lieu thereof an open ended frust-conical deflector is mounted coaxially within the port so that the deflector diverges toward the valve chamber forming an annular ring of fluid which tends to center the ball valve within the valve chamber.

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