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:
Aug. 01, 1978
Filed:
Apr. 21, 1977
Harold T Lange, St. Louis, MO (US);
Sporlan Valve Company, St. Louis, MO (US);
Abstract
A filter-drier assembly adapted for bidirectional flow in heat pump systems. The filter-drier assembly includes a pair of bypass lines in the liquid line, each bypass line circumventing one of the expansion devices located in the liquid line. An expansion device is located ahead of the outdoor coil for use in one mode of operation and a second expansion device is located ahead of the indoor coil for use in the other mode of operation. A filter-drier unit is disposed in each bypass line, each filter-drier unit including a check valve enabling flow through the associated bypass line and filter-drier unit in one direction and precluding flow in the opposite direction. The check valve of each filter-drier unit precludes flow in the bypass line when its associated expansion device is operable in one mode of operation. The filter-drier unit includes a shell provided with an inlet and an outlet, and filtering and drying elements in the shell between the inlet and outlet. The check valve is connected to the outlet to enable flow through the shell and through the filtering and drying elements from inlet to outlet and to preclude reverse flow.