The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 1990
Filed:
May. 22, 1989
Hazime Tanaka, Yokohama, JP;
Ernest W Schumacher, Ovilla, TX (US);
Abstract
A thermostatic expansion valve located at the inlet of an evaporator in the refrigeration apparatus has a valve housing supporting a diaphragm in its sealed space. Pressure from a thermal bulb is applied on the upper surface of the diaphragm, and pressure of a reduced-pressure refrigerant in the inlet of the evaporator is applied on the lower surface of the diaphragm through on equalizing signal passage extending from a refrigerant passage formed in the housing to the sealed space in the housing. In the refrigerant passage, a valve seat is formed. The equalizing signal passage is opened at the passage in the downstream side of the valve seat. A sectional area of the refrigerant passage between the passage side opening of the signal passage and the valve seat is larger than that of the refrigerant passing hole of the valve seat but smaller than that of the refrigerant passage at a position remoter from the valve seat than the passage side opening of the signal passage.