Title:
流体用開閉弁装置
Document Type and Number:
Japanese Patent JP4654747
Kind Code:
B2
Abstract:
A check valve (fluid on-off valve device) 1A, capable of attaining high sealability in either case where a differential pressure is high or low, comprises a valve body assembly (valve body) 3A contacting and separating from a valve seat portion for communicating and blocking a fluid passage. The valve body assembly 3A comprises a valve body 10, a low-pressure seal portion 12 constituted out of soft material and a high-pressure seal portion 13 constituted out of harder material than the low-pressure seal portion 12. In blocking a fluid passage, when a differential pressure between an upstream path 7 and a downstream path 8 in the fluid passage is relatively low, the low-pressure seal portion 12 comes into close contact with a protrusion 6 to block the fluid passage, while when the differential pressure is relatively high, the low-pressure seal portion 12 is compressively deformed by the differential pressure and the high-pressure seal portion 13 comes into close contact with the valve seat body 4, thus blocking the fluid passage.
Inventors:
Ishitoya
Nobuo Kobayashi
Atsuko Ogami
Akira Yamashita
Nobuo Kobayashi
Atsuko Ogami
Akira Yamashita
Application Number:
JP2005117597A
Publication Date:
March 23, 2011
Filing Date:
April 14, 2005
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F16K1/34; F16K15/00; F16K25/00; F16K39/02
Domestic Patent References:
| JP55031023U | ||||
| JP63062670U | ||||
| JP58084459U | ||||
| JP52002528U |
Foreign References:
| GB1213100A |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Shinji Oga
Toshifumi Onuki
Shinji Oga
Toshifumi Onuki