Patent ID: 8251347

Claim:
A high pressure diaphragm gas valve comprising: a valve body with a valve chamber of generally cylindrical configuration therein, said valve chamber having a first end and a second end that is axially spaced from said first end, and a nozzle axially protruding from said first end into said valve chamber, wherein a first gas port is arranged in a front face of said nozzle and a second gas port is arranged in said first end laterally of said nozzle; a seat assembly removably fitted in said first end of said valve chamber, said seat assembly including: a mounting ring with a central seat hole, an inner flange, a main ring body with gas passages therein and an outer ring flange; a synthetic seat ring fitted in said central seat hole of said mounting ring, said synthetic seat ring having a central through hole therein and a front face forming a seat surface in said valve chamber around said first gas port, said nozzle penetrating in a sealed way into said central through hole of said synthetic seat ring, which has at the opposite side of said seat surface, a seat ring foot surface that is pressed by said mounting ring onto said nozzle shoulder surface; and peripheral sealing means along said outer ring flange of said mounting ring; a diaphragm sealing off said second end of said valve chamber, wherein said diaphragm has a central sealing surface and an outer rim in sealing engagement with said peripheral sealing means of said seat assembly; and means for pressing said central sealing surface of said diaphragm onto said seat surface of said seat assembly; wherein said second gas port is formed by a gas collecting ring channel incorporated into said valve body wherein it surrounds said nozzle shoulder surface and is itself surrounded by an outer shoulder surface of the valve body; and said mounting ring is supported with its inner ring flange on said nozzle shoulder surface and with its outer ring flange on said outer shoulder surface, so that said at least one peripheral gas passage opens into said ring channel.