Title:
SEAL STRUCTURE FOR GATE VALVE
Document Type and Number:
WIPO Patent Application WO/2011/104861
Kind Code:
A1
Abstract:
Provided is a seal structure for a gate valve, which is suitable for obtaining a gate valve that is comprised of compact components and has an excellent sealing capability. A gate valve (GV) to be sealed using a sheet-like member (W) is comprised of a pressing member (2) having a pressing surface (1); a receiving member (4) having a receiving surface (3) opposed to the pressing surface (1); a gate (5) having one end opened toward the receiving surface (3); a first annular sealing element (6) which seals a clearance around the open end of the gate (5); a second sealing element (7) which is adjacent to the first sealing element (6) when the pressing surface (1) is pressed to the receiving surface (3); a space (8) surrounded by the pressing surface (1), the receiving surface (3), the first and second sealing elements (6, 7), and the sheet-like member (W) passing through the gate (5) when the pressing surface (1) is pressed to the receiving surface (3); and a differential evacuation passage (9) which is in communication with the space (8). The space (8) is evacuated via the differential evacuation passage (9) and, accordingly, functions as a differential pressure chamber for a differential evacuation seal for sealing a microscopic clearance around the sheet-like member (W) using a differential evacuation.
Inventors:
YOSHIDA HIDEHIKO (JP)
Application Number:
PCT/JP2010/053079
Publication Date:
September 01, 2011
Filing Date:
February 26, 2010
Export Citation:
Assignee:
IRIE KOKEN KK (JP)
YOSHIDA HIDEHIKO (JP)
YOSHIDA HIDEHIKO (JP)
International Classes:
F16K51/02
Foreign References:
| JPH05251361A | 1993-09-28 | |||
| JP2000232069A | 2000-08-22 | |||
| JPH02369U | 1990-01-05 | |||
| JP2000216094A | 2000-08-04 | |||
| JPS6418149U | 1989-01-30 |
Attorney, Agent or Firm:
WADA Shigenori et al. (JP)
Wada 成 rule (JP)
Wada 成 rule (JP)
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Claims: