Patent ID: 7604218

Claim:
A valve including a valve housing providing a chamber accommodating at least part of a valve member, said chamber forming at least part of a first or high pressure side of said valve, a valve port leading from said chamber to a second or low-pressure side of said valve, a valve seat around the valve port, said valve member having a seating surface co-operating with the valve seat and the valve member being displaceable, along an axis passing through said port, respectively (a) in a first direction, to move said seating surface into said chamber and away from said valve seat and (b) in a second, opposite direction, to move said seating surface towards said valve seat, biasing means being provided biasing said valve member in said second direction towards its closed position, the valve housing having an extension extending, in said second direction, beyond said port and forming a transverse wall at an axial end of said extension at a distance from said port, said extension having an axial bore extending from said port and forming a central aperture in said transverse wall, which aperture forms a bearing for an axial extension of said valve member through which bearing said axial extension passes as a sliding fit, whereby the valve member is guided for said axial movement, said axial bore being bored out to a seat diameter of the valve port up to a distance just short of said transverse wall to provide a passage for gas from said port and at least one transverse outlet bore radiating from said axial bore to a respective opening in a side wall of said extension, on the periphery of the valve housing, so that gas outflow from said port is translated from the axial sense to the radial sense, the transverse wall serving to deflect any gas proceeding from said valve port in a direction parallel with said valve axis, wherein the periphery of said extension of the valve housing is undercut in the region behind the transverse wall, in such a way that said undercut region becomes gradually increasingly spaced from said axis with distance, measured parallel with said axis, away from said transverse wall, so that over said undercut region, the peripheral surface of the valve body is inclined with respect to said axis, and wherein one or each said opening or openings at the side of the valve body opens onto said inclined peripheral surface which serves to direct any gas exiting the opening or openings in a downward direction towards an outlet port of the valve.