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:
Feb. 24, 1987
Filed:
Nov. 04, 1985
Abstract
Reversible four-way valve for the refrigerating system. It has a cylindrical valve body through which a single piston is adapted to reciprocate slidably. This single piston divides the cylindrical valve body into two chambers. One of the two chambers is used for admitting high pressure gas thereinto whereas the other is assigned for controlling the piston in counteracting the high pressure gas. For this purpose, the piston is formed with a pressure equalizing hole therein to communicate the two chambers with each other while the piston is urged toward the chamber into which the high pressure is admitted. This is done by a compression spring having a force stronger than required to overcome all resistance when both chambers are under the equal pressure. Since the reversible valve has only two chambers, compact design is possible and the operation is stable.