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:
Mar. 31, 1998
Filed:
Jun. 06, 1995
Manabu Ota, Ogaki, JP;
Pacific Engineering Co., Ltd., Ogaki, JP;
Abstract
A four-way change-over valve for an air conditioner has first to fourth piping holes sequentially arranged on a concentric circle at a predetermined pitch in a planar portion of a valve seat formed in a thick disk shape as one portion of a valve case. The change-over valve also has a rotary valve rotatably arranged on an upper face of this valve seat and having at least one communicating groove for independently connecting two adjacent piping holes of the four piping holes to each other. Cooling and heating operations of the air conditioner are switched by rotating the rotary valve. A service valve with a four-way change-over valve for an air conditioner is characterized in that both service valves on liquid and gas sides of a refrigerant circuit are integrated with each other and are further integrated with the four-way change-over valve as one valve unit with one valve seat as a common valve seat. In accordance with such valve structures, the four-way change-over valve has a simplified structure and is made compact.