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SAFETY VALVE FOR LIQUID PRESSURE CYLINDERS

  • US 3,645,286 A
  • Filed: 05/29/1969
  • Issued: 02/29/1972
  • Est. Priority Date: 05/29/1969
  • Status: Expired due to Term
First Claim
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1. In a valve for use with pressure liquid gas cylinders comprising a valve body having a shank adapted for threading engagement with the cylinder, said shank having a central bore leading to a valve seat, and a valve member adapted to be moved into sealing engagement with said seat, a safety valve associated with the inner end of said shank biased to an open position and responsive to excess flow conditions in the bore to arrest flow therethrough, said safety valve having bore sealing means adapted to move into sealing relation to said bore to prevent outflow of gas into the bore at an abnormal rate, and means responsive only to final closing movement of said valve member toward the seat for establishing a bypass from one side of the safety valve to the other for equalizing the pressure on opposite sides of the bore sealing means to enable the safety valve to move to an open position terminating the seal formed by the bore sealing means upon closure of said valve member.

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