Gas valve with electromagnetic operation e.g. fuel injection valve for gas engine for stationary applications or for commercial vehicle

摘要

The valve includes a differential pressure compensating device which is formed from a piston (17) on the central pin (6) which has an area equal to that of the sealing element (7) that is acted on by pressure from a compensating chamber (20) on the opposite side of the piston to the outflow chamber (24) which is at fuel outlet pressure. The valve has a housing (1) with an inlet (5) and an outlet within which a sealing element mounted on a central pin is selectively moved by the armature (12) of an electronically controllable electromagnet (14) towards and away from a valve seat (3), with a closure spring (8) biasing the sealing element towards the closed position. At least one compensating piston, formed by a projecting disc that is axially displaceable on the central pin, is displaceably movable in the valve housing in a sealed manner and is clamped between the closure spring and the sealing element. The piston is acted on by the fuel pressure in the opening direction of the valve, and gas passages are provided from the fuel outlet and/or an outflow chamber to a compensating chamber on the opposite side of the piston to the outflow chamber.