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The electro-magnetic valve includes a hydraulic pilot control consisting of an inlet and outlet with a concentric valve seat, sealable by a flexable diaphragm. The inlet and outlet are both arranged on one side of the diaphragm and a hydraulic pressure is arranged on the other side of the diaphragm.

The electro-magnetic valve includes a hydraulic pilot control consisting of an inlet and outlet with a concentric valve seat, sealable by a flexable diaphragm. The inlet and outlet are both arranged on one side of the diaphragm and a hydraulic pressure is arranged on the other side of the diaphragm. A filling aperture from the inlet to the pressure chamber and a central pressure relief aperture from the pressure chamber to the outlet are provided, the central pressure relief aperture being connected to a bypass in the valve body. An electro-magnetic means for opening the pressure relief aperture is also included.

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An electro-magnetic valve having hydraulic control consisting of a valve body having an inlet and an outlet, a valve seat sealable by a flexible diaphragm, in which both the inlet and the outlet are arranged on a first side of the diaphragm, a hydraulic pressure chamber on a second side of the diaph

An electro-magnetic valve having hydraulic control consisting of a valve body having an inlet and an outlet, a valve seat sealable by a flexible diaphragm, in which both the inlet and the outlet are arranged on a first side of the diaphragm, a hydraulic pressure chamber on a second side of the diaphragm, a filling aperture from the inlet to the pressure chamber and a pressure-relief aperture from the pressure chamber to the outlet, an armature which, when unenergized, closes the pressure-relief aperture under spring pressure, wherein the improvement comprises said hinged armature being positioned entirely within the pressure chamber and said pressure-relief aperture being opened when said armature is energized; a valve seat of said pressure-relief aperture being a non-flexible part of said diaphragm; and a by-pass in the valve body connecting the pressure-relief aperture and the pressure chamber to the outlet, and said valve seat of said pressure relief aperture being juxtapositioned to said bypass.