Title:
バタフライバルブ
Document Type and Number:
Japanese Patent JP4808792
Kind Code:
B2
Abstract:
Provided is a butterfly valve that prevents occurrence of erosion, thereby rendering it possible to secure fine adjustment of a volumetric flow rate of a fluid in an area of low degree of valve opening or in an area of minute degree of valve opening, to infallibly attain high range ability. This invention provides a butterfly valve for opening and shutting an interior of an elastic seat ring 2 mounted in a cylindrical valve casing 1 by rotation of a disc valve member 3, wherein the butterfly valve comprises depressing valve parts 10 and 11 provided at least on an orifice side 8 of the valve member 3 and adapted to make depressing contact with the elastic seat ring 2 in the area of low degree of opening or in the area of minute degree of opening of the valve member 3, a void part 12 formed along an outer peripheral edge of the valve member 3 or at a downstream side position of the outer peripheral edge, and communicating parts 13 formed in the valve member 3 or the depressing valve parts 10 and 11 to establish communication from the void part 12 toward a downstream side.
Inventors:
Hiroshi Ando
Yoshiharu Sato
Yoshiharu Sato
Application Number:
JP2009062265A
Publication Date:
November 02, 2011
Filing Date:
March 16, 2009
Export Citation:
Assignee:
KITZ CORPORATION
International Classes:
F16K1/226; F16K1/22; F16K25/04; F16K47/02
Domestic Patent References:
| JP59101054U | ||||
| JP2589805Y2 | ||||
| JP43668C2 | ||||
| JP11063246A | ||||
| JP1075665U |
Attorney, Agent or Firm:
Tetsuo Kobayashi