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BI-DIRECTIONAL VALVE FOR CRYOGENIC FLUIDS

  • US 3,650,508 A
  • Filed: 02/06/1969
  • Issued: 03/21/1972
  • Est. Priority Date: 02/06/1969
  • Status: Expired due to Term
First Claim
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1. A valve comprising a body member provided with a passageway for fluids, a valve Disc rotatably mounted in the passageway for controlling the flow of fluids therethrough, bidirectional, thermally responsive sealing means mounted in the passageway of said body member for coaction with said valve disc to seal off the flow of fluids through the body member in both fluid flow directions through the passageway, said sealing means being constructed of a thermally sensitive resilient material and constructed for engaging the edge of the valve disc in leak-proof fashion, means for mechanically loading the sealing means to effect a seal at the edge of the valve disc, and mechanical responsive means mounted adjacent said sealing means and providing a sealing load to compensate for the expansion and contraction of said sealing means in response to temperature changes to provide an essentially constant sealing load.

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