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. 18, 2003
Filed:
Aug. 28, 2001
Applicant:
Inventors:
Assignee:
Aisan Kogyo Kabushiki Kaisha, Obu, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K 3/1383 ;
U.S. Cl.
CPC ...
F16K 3/1383 ;
Abstract
Bi-directional pilot type electromagnetic flow valves are capable of preventing reverse flow while utilizing the advantageous properties of pilot type electromagnetic valves. Bi-directional pilot type electromagnetic flow valves may include two pilot type electromagnetic flow valves that are connected in series, but disposed in opposite operational directions. Preferably, one of the pilot type electromagnetic flow valves acts as an anti-reverse flow valve. Therefore, the two-way piping can be switch between a state preventing reverse flow and a state permitting reverse flow. Moreover, a relatively small solenoid coil can be utilized to drive the pilot type electromagnetic valves.