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. 16, 1979
Filed:
Nov. 03, 1977
Bernard L Kunz, Collinsville, IL (US);
Emerson Electric Co., St. Louis, MO (US);
Abstract
An expansion valve for a refrigeration system, and in particular, for a reversible flow or heat pump application is provided in which the valve is electrically operated by a heat motor mounted to a valve body. The valve includes a valve stem operatively connected to the heat motor. The valve stem position, and consequently, valve operation, is controlled by heat motor operation. Because of the reverse flow nature of the fluid flow in the system described, means for protecting the heat motor from fluid leakage is necessary, if the valve is to function properly. The valve of this invention includes bleed or drain means positioned to drain fluid from the heat motor, and seal means on the valve stem of the valve to reduce flow leakage along the stem.