PLUNGER VALVE

The utility model discloses a plunger valve, comprising a valve body, a plunger, and a two-position three-way valve. The three valve mouths of the two-position three-way valve are respectively and commonly arranged on a valve inlet and a valve outlet on the valve body and are communicated with an upper valve arranged above the plunger; through the positional transformation of the valve core of the two-position three-way valve, the cavity of the upper valve is made to depressurize or pressurize; under the action of the top and bottom pressure difference, the plunger can conduct the reciprocating movement, and the valve seat can be opened or closed. Accordingly, the exterior opening-closing force can be only used for overcoming the moving resistance of the valve core of the two-position three-way valve. However, under the action of the pressure of the fluid medium, the movement of the plunger can be realized, and accordingly, the opening and the closing of the plunger valve with the structure is labor-saving and rapid.