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:
Sep. 20, 2011
Filed:
Jun. 14, 2007
Tadahiro Ohmi, Sendai, JP;
Nobukazu Ikeda, Osaka, JP;
Kouji Nishino, Osaka, JP;
Masaaki Nagase, Osaka, JP;
Kyousuke Dohi, Osaka, JP;
Ryutaro Nishimura, Osaka, JP;
Tadahiro Ohmi, Sendai, JP;
Nobukazu Ikeda, Osaka, JP;
Kouji Nishino, Osaka, JP;
Masaaki Nagase, Osaka, JP;
Kyousuke Dohi, Osaka, JP;
Ryutaro Nishimura, Osaka, JP;
Other;
Fujikin Incorporated, Osaka, JP;
Abstract
A fluid passage is emergently-closed in a short time without causing a water hammer by an extremely simple device and operation. A water hammerless closing device includes an actuator operated valve provided in a fluid passage, an electro-pneumatic conversion device for supplying a 2-step actuator operating pressure Pa to an actuator operated-type valve, a vibration sensor removably secured to the pipe passage on the upstream side of the actuator operated-type valve, and a tuning box receiving a vibration detection signal Pr from the vibration sensor and delivering a control signal Sc to the electro-pneumatic conversion device for controlling the step operating pressure Ps' of the 2-step actuator operating pressure Pa so that, with the control signal Sc being regulated, the electro-pneumatic conversion device outputs the 2-step actuator operating pressure Pa with the step operating pressure Ps′ capable of bringing the vibration detection signal Pr substantially to zero.