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Valve body for non-sliding type gate valve

  • US 5,087,017 A
  • Filed: 06/12/1990
  • Issued: 02/11/1992
  • Est. Priority Date: 01/10/1989
  • Status: Expired due to Fees
First Claim
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1. In a non-sliding gate valve for high vacuum use comprising a valve housing having a valve seat and a counter plate receiving seat surrounding a valve opening formed in said valve housing, and a valve body to close or open said valve seat and said counter plate receiving seat, an improvement wherein said valve body comprises a paired valve plate and a counter plate, said valve and counter plates each made of a circular thin metal plate having an outer diameter sufficient to close said valve seat and counter plate receiving seat respectively formed in said valve housing and each having its center line arranged in line with a center line of said valve opening and in parallel with said valve seat and said counter plate receiving seat as well as each other with gaps being left between said said valve plate and valve seat, between said valve and counter plates, and between said counter plate and said counter plate receiving seat, and a pair of inner support members arranged within said gap between said valve plate and said counter plate so as to be concentric with them and in parallel with each other, each of said inner support members having an outer diameter smaller than the outer diameter of said valve and counter plates, and an annular outer support member arranged radially outside said inner support member and made of an annular metal body having an inner diameter larger than the outer diameter of said valve and counter plates with a width substantially equal to the combined thicknesses of said inner support members, and a pair of diaphragm-like annular elastic connecting sheets arranged between the outer peripheries of said inner support members and the inner periphery of said outer support member, each annular elastic connecting sheet being made of a thin metal sheet, said valve and counter plates being sealingly connected to said inner support members, respectively, to confront them, the outer peripheries of said inner support members and the inner periphery of said outer support member being sealingly secured to said annular elastic connecting sheets at the inner and outer peripheries of said annular elastic connecting sheets, respectively, each of said annular elastic connecting sheets being formed with at lest one concentric corrugation on the surface thereof and perpendicular thereto, a sealed space being formed between said inner support members, said annular elastic connecting sheets and said outer support member.

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