A solenoid on-off valve for opening or closing a flow channel passing through a valve chamber by alternately moving a plunger in the valve chamber with a solenoid and a return spring,MULTI-FUNCTIONAL WATER PUMP CONTROL VALVE comprises valve seats on both ends of the valve chamber, a valve head for closing valve seats is disposed at one end,Balance Valves while a path for communicating the valve hole of the valve seat with the valve chamber is disposed at the other end of the plunger and the flow channel is adapted so as to be normally open or normally closed by the mounting of the plunger in the valve chamber while turning the direction depending on the case. In an electric solenoid on-off valve for opening and closing a flow channel passing through the solenoid plunger chamber of said valve by moving a solenoid plunger alternately against first and second ported valve seats positioned at the opposite ends of said chamber,Bellows Seal Valves in which each of said valve seats is provided with a valve hole therethrough, and which a plunger return spring is disposed in said chamber for returning said plunger against one of said valve seats, the improvement comprising: a valve head formed on one end of said plunger for closing the port in one of said seats, means on the other end of said plunger defining a groove forming a path for communicating the valve hole in the other said valve seat with said chamber, said plunger adapted to be reversibly received in said chamber by turning end-for-end so that said flow channel through said valve is either normally open or normally closed depending upon the orientation of said plunger, and a manually operated push button disposed in said valve and having an operating lever extending through the valve hole in said one valve seat into the interior of said chamber for engagement with said plunger therein and operable upon pressing to move said plunger against said return spring. The object of the present invention is to provide a solenoid on-off valve capable of easily attaining a normally open state and a normally closed state switchingly by a simple structure. The foregoing object of the present invention can be attained by a solenoid on-off valve for opening or closing a flow channel passing through a valve chamber by alternately displacing a plunger in the valve chamber by a solenoid and a return spring, wherein valve seats are disposed at both ends of the valve chamber, a valve head for closing the valve seats is disposed to one end and a passage for communicating the valve hole of the valve seat with the valve chamber is disposed to the other end of the plunger, and the plunger is mounted in the valve chamber while turning their ends occasionally, thereby enabling to switch the flow channel between a normally open state or a normally closed state.

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