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Thermal-operated valve for control of coolant rate of flow in oil wells

  • US 4,209,065 A
  • Filed: 11/13/1978
  • Issued: 06/24/1980
  • Est. Priority Date: 11/16/1977
  • Status: Expired due to Term
First Claim
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1. A thermally operated valve for automatic control of the rate of flow of a fluid coolant for hot gases produced by underground gasification of solid fuel deposits or by in situ combustion in oil wells, incorporating a temperature-sensitive element comprising a metal tube several meters long to be incorporated in a pipe for supplying coolant to the well, and a rod of a metal having a low coefficient of expansion coaxial with the pipe, the upper end of which rod is attached to the upper part of the metal tube and the lower end of which rod is connected to a valve member by a connecting element having adjustable clearance or play, the metal tube is lined with a layer of impermeable material having a low coefficient of thermal conductivity.

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