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Title:
DIAPHRAGM VALVE
Document Type and Number:
WIPO Patent Application WO/2019/188510
Kind Code:
A1
Abstract:
Provided is a diaphragm valve with which a seal created by the peripheral edge of a diaphragm can be maintained. A diaphragm valve 1 comprises a diaphragm part, a primary-side part 103, a secondary-side part 104, a main valve 60, a back-pressure chamber 31, a primary-side auxiliary flow channel, a secondary-side auxiliary channel, an auxiliary valve 45, an auxiliary-valve drive unit 40, and body portions 10, 30 that accommodate the main valve 60. The area of a portion in a first body portion 10 that receives one-directional pressure heading from the primary-side part 103 toward the back-pressure chamber 31 is greater than the area of a portion in the first body portion 10 that receives other-directional pressure acting from the back-pressure chamber 31 toward the primary-side part 103.

Inventors:
DOMOTO NAOKI (JP)
KUSHIMOTO ATSUSHI (JP)
Application Number:
PCT/JP2019/011210
Publication Date:
October 03, 2019
Filing Date:
March 18, 2019
Export Citation:
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Assignee:
LIXIL CORP (JP)
International Classes:
F16K7/12; F16K31/126
Domestic Patent References:
WO2003056222A12003-07-10
Foreign References:
EP0930402A21999-07-21
US20120168005A12012-07-05
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (JP)
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