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Self-adjusting valve

  • US 6,105,379 A
  • Filed: 03/14/1997
  • Issued: 08/22/2000
  • Est. Priority Date: 08/25/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus for controlling the flow of refrigerant fluid through an evaporator in a refrigeration system comprising a self-adjusting thermally powered expansion valve having a back pressure for controlling fluid flow downstream of the valve independently of the fluid pressure upstraem of the valve, said valve has an inlet and an outlet for passage of fluid through the valve and a valve element intermediate the inlet and outlet such that the position of the valve element determines the flow passage area for flow between the inlet and outlet,a first probe for sensing the temperature at a first location and providing a fluid pressure that is representative of the sensed temperature to configure the valve element for controlling the flow of refrigerant fluid through the orifice, anda second probe for sensing the temperature at a second location and providing a fluid pressure that is representative of the sensed temperature to configure the valve element for controlling the flow of refrigerant fluid through the orifice.

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