Expansion valve

Details Expansion valve Expansion valve

1997-09-11

1999-07-20

Tapolcai, William E.

Automatic temperature and humidity regulation

Thermostatic

With pressure control

219137R, F25B 4104

Patent

active

059246294

ABSTRACT:
An expansion valve has a housing with a hole extending through its outer wall. A plug body seals the hole after a heat sensing gas, which senses the temperature of the gas-phase refrigerant passing through the expansion valve, is pressurized in the housing through the hole. The plug body, which is made from a cut metallic material, seals the hole to maintain the pressurized gas in the housing. The plug body is welded to the housing by an electrical weld. A corrosion inhibitor can be applied around the weld periphery to prevent corrosion from forming at the weld areas. The plug body has a line contact portion formed by a tapered surface, e.g., a conical portion, with a plurality of concentrically arranged a line contact portion, which has spaced projections. These projections can be formed, for instance, by cutting circumferentially around the tapered surface. The spacings between the spaced projections form a plurality of weld areas that can securely seal the plug body at the line contact portion to the housing.

REFERENCES:
patent: 2152781 (1939-07-01), Wile
patent: 2472149 (1949-06-01), Dillman
patent: 4143790 (1979-03-01), Ueno et al.
patent: 4384657 (1983-05-01), Ueno et al.
patent: 4499136 (1985-02-01), Nakamura et al.
patent: 4735835 (1988-04-01), Taira et al.
patent: 4935080 (1990-06-01), Hassell et al.
patent: 5072605 (1991-12-01), Imazu et al.
patent: 5228588 (1993-07-01), Aizawa et al.
patent: 5249447 (1993-10-01), Aizawa et al.
patent: 5303864 (1994-04-01), Hirota

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