Balanced single port thermostatic expansion valve

Details Balanced single port thermostatic expansion valve Balanced single port thermostatic expansion valve

1976-08-26

1978-06-20

Wayner, William E.

Automatic temperature and humidity regulation

Thermostatic

With pressure control

62225, 13750518, G05D 2700

Patent

active

040957420

ABSTRACT:
A thermostatic expansion valve for large-capacity refrigeration systems has a pressure-balanced valve pin and no means of communicating inlet pressures to the underside of the diaphragm. The valve pin has a coaxial bore, a pair of end faces, a pair of cylindrical portions fitting slideably in a feed bore leading to an outlet chamber, a reduced stem portion of small diameter between the pair of cylindrical portions, and a pair of shoulders connecting the reduced stem portion to the pair of cylindrical portions. The shoulders are exposed to the same pressure so that the valve pin is balanced.

REFERENCES:
patent: 3087705 (1963-04-01), Hamilton
patent: 3150687 (1964-09-01), Kalle
patent: 3786651 (1974-01-01), Eschbaugh et al.
patent: 3967782 (1976-07-01), Eschbaugh et al.

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