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Flow control means for compressed gas cylinders

  • US 4,077,422 A
  • Filed: 11/17/1975
  • Issued: 03/07/1978
  • Est. Priority Date: 11/17/1975
  • Status: Expired due to Term
First Claim
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1. A flow control means for a compressed gas cylinder having a high-pressure control valve arranged to control the flow of gas from said cylinder, wherein the improvement comprises:

  • a fail-safe shutoff means incorporated into the highpressure control valve and arranged in series flow communication with said control valve and including;

    a valve seat formed about an inlet opening of said control valve,a valve spool having an inlet end and an outlet end with a flow communication passage therethrough for flow communication between said cylinder and said control valve and having said outlet end extending partially into the inlet opening to provide an individual fluid pressure chamber adjacent the flow outlet end and being isolated from said flow communication passage, said valve spool being preset to an open position relative to said valve seat permits a normal operative flow of gas to pass through said flow communication passage wherein said pressure chamber provides means to detect a defect in the high pressure control valve associated with predetermined loss of fluid from said pressure chamber and being responsive to such defect to activate said valve spool to move it from the open position to a closed position relative to said valve seat to block gas flow through the shutoff means.

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