Thermal expansion valve and system including such device and met

Details Thermal expansion valve and system including such device and met Thermal expansion valve and system including such device and met

1998-10-13

1999-06-22

Tapolcal, William E.

Refrigeration

Automatic control

Refrigeration producer

236 92B, 236102, F25B 4104

Patent

active

059138912

ABSTRACT:
A thermal expansion valve comprises a metal tube for flowing a fluid therethrough, and a metal rod fixed only at a first end in the tube and disposed wholly within the tube, the metal tube having a greater coefficient of expansion than the metal rod. A plug having an orifice therethrough is disposed in the tube proximate a free end of the rod. Lengthwise thermal expansion and contraction of the tube and the rod caused by the temperature of the fluid in the tube and around the rod causes the free end of the rod to retreat from the plug to increase flow of the fluid therethrough, and causes the free end of the rod to approach the plug to restrict flow of the fluid therethrough, respectively.

REFERENCES:
patent: 2971349 (1961-02-01), Orth et al.
patent: 3294148 (1966-12-01), Alvarado
patent: 4441327 (1984-04-01), Klee et al.
patent: 5819548 (1998-10-01), Clawson

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