• US 3,620,237 A
  • Filed: 06/06/1969
  • Issued: 11/16/1971
  • Est. Priority Date: 06/12/1968
  • Status: Expired due to Term
First Claim
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1. A valve comprising a housing having a bore, the bore having an inlet and an outlet for fluid, a piston slidably engaged within the bore, at least one ball element seated in the wall of the bore and projecting from said wall normally to provide an abutment for one end of the piston, a collapsible member extending across the bore of the housing and adjacent an end of the piston to hold said at least one ball element seated in said wall thereby to retain the piston in a valve-closed position axially of the bore against the effect of pressurized fluid, and pressure-responsive means responsive to a precalculated change of external pressure to apply a load of precalculated magnitude to said collapsible member to cause collapse of said member and allow movement of the piston along the bore to a valve-open position thereby to release the fluid through the valve.

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