Patent ID: 8336890

Claim:
A combination valve, piston, cylinder and annular gap seal, said annular gap seal blocking a flow of a fluid from a high-pressure side to a low-pressure side of the valve in a blocked position, the valve having said cylinder which the fluid may flow through and in which said piston is axially displaceable, and an annular gap between the piston and the cylinder being sealable in the blocked position using the annular gap seal, which lies in a peripheral groove of the cylinder, the groove having a peripheral lug that projects toward a middle plane of the groove on both sides, said lug having an interior surface facing the groove that is upwardly inclined from a wall of the groove toward the middle plane of the groove, two sealing rings positioned mirror-symmetrically next to one another in the groove being provided, said sealing rings having a shoulder corresponding to a shape of the inclined surface of the lug and contacting the lug in an area where the lug is inclined, and a sealing surface of a first sealing ring facing toward the low-pressure side being able to be pressed fluid-tight against the groove wall by the fluid from the high-pressure side in the blocked position, wherein, in the blocked position, the sealing shoulder of the first sealing ring facing toward the low-pressure side may be pressed fluid-tight against the peripheral lug, which projects into the groove toward the central plane of the groove, and a sealing lip of the first sealing ring facing toward the low-pressure side may be pressed fluid-tight against the piston by the fluid from the high-pressure side.