Expansion valve

Details Expansion valve Expansion valve

1997-09-23

2000-11-14

Tapolcai, William E.

Automatic temperature and humidity regulation

Thermostatic

With pressure control

62225, 251900, F25B 4104

Patent

active

061457531

ABSTRACT:
A thermal expansion valve has a valve housing, a valve, a valve controller, a rod, and a seal ring. The valve housing has a first refrigerant passage, which is adapted to pass a liquid-phase refrigerant, and a second refrigerant passage, which is adapted to communicate a gas-phase refrigerant. The valve housing has a wall that separates the first and second passages. This wall has an opening that is in fluid communication with the first and second passages. The valve controls flow of the liquid-phase refrigerant entering the first passage. The valve controller is mounted on the valve housing and has a diaphragm and first and second chambers separated by the diaphragm. The rod extends between the diaphragm and the valve and is movably displaceable through the opening in the wall to open and close the valve to control the amount of the liquid-phase refrigerant entering the first passage. The seal ring is positioned in the opening and engages the opening surface of the wall and the rod to seal the opening. The seal ring has an X-shaped profile, with four sealed portions, two of which engage the opening surface and two of which engage the rod member to seal the opening against the opening surface of the wall and the rod.

REFERENCES:
patent: 2841429 (1958-07-01), McCuistion
patent: 4191203 (1980-03-01), Panigati
patent: 5040905 (1991-08-01), Boyd
patent: 5172727 (1992-12-01), Stoll et al.
patent: 5297728 (1994-03-01), Yano et al.
patent: 5361597 (1994-11-01), Hazime et al.

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