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. 23, 1990
Filed:
Feb. 10, 1989
Joseph H Heffner, Chesterfield, MO (US);
G Thomas Seener, St. Louis, MO (US);
Dennis L Hoehne, St. Louis, MO (US);
Sporlan Valve Company, St. Louis, MO (US);
Abstract
This combination expansion valve and check valve (18) includes a valve body (22) having an inlet (24) and a outlet (26). A control valve (28) is disposed between the inlet and the outlet which controls flow through the valve when refrigerant flow is normal and pressure is higher at the inlet than the outlet. A by-pass conduit (60) is connected between the inlet and the outlet and includes an external conduit (62) and a passage (70) within the valve communicating with the outlet. A check valve (58) is disposed within the passage which selectively blocks flow through the conduit. The check valve includes a floating disc (66) moving between spaced check valve ports (61, 63) to block flow through the conduit when the expansion valve is operating and to permit flow through the conduit when flow is reversed. Two identical valves (18a) and (18b) are reversely connected to tandem to operate alternatively as expansion valves in a heat pump system (10).