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Valve bonnet for high temperature service

  • US 4,344,454 A
  • Filed: 06/01/1981
  • Issued: 08/17/1982
  • Est. Priority Date: 06/01/1981
  • Status: Expired due to Fees
First Claim
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1. A bonnet connection on the body of a valve used to control the flow of hot fluids comprising:

  • a lateral opening through the body wall connecting with the valve bore;

    a laterally extended portion of the body wall formed around the lateral opening;

    the opening being sufficient to allow for the removable installation of valve seat means and valve closure means within the valve bore;

    a valve bonnet comprising a substantially rigid end portion and a substantially flexible flange formed to be positioned relative to the laterally extended portion of the valve body so as to allow for proper operation of the valve closure means;

    the flange depending from the end portion and extending around and adjacent to the laterally extended portion of the body wall such that the laterally extended portion of the body wall may be attached to the flange by welding so as to seal between the bonnet and the body and retain the bonnet with the body for proper operation of the valve, the flange being substantially thinner than the extended portion of the body wall and a space being defined between the flange and the body wall such that substantial differential thermal expansion of the body wall may occur without causing substantial movement of the end portion.

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