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Fluid valves

  • US 4,280,680 A
  • Filed: 08/01/1978
  • Issued: 07/28/1981
  • Est. Priority Date: 08/16/1977
  • Status: Expired due to Term
First Claim
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1. A valve, comprising:

  • a fluid port;

    a valve seat round the port; and

    closure means movable towards and away from the seat, the closure means including a sealing surface engageable with the seat and a protrusion of resilient material which extends from the sealing surface towards the seat, the protrusion being from the sealing surface towards the seat, the protrusion being operative to create a flow of fluid of increased velocity between the seat and the sealing surface prior to the latter engaging the seat upon movement of the closure means towards the seat and the protrusion further being adapted for at least part thereof to be urged automatically into sealing engagement with the surround of the port by fluid pressure in the valve when the sealing surface engages the seat, the closure means further including a resilient diaphragm which is adapted to isolate operating means for the closure means from fluid flowing through the valve and which is adapted to be anchored in an outer peripheral zone thereof to a casing for the valve, the diaphragm being provided at its outer peripheral zone with a screw thread engageable with a screw thread on at least one of two parts between which the outer peripheral zone of the diaphragm is adapted to be trapped.

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