Title:
CHECK VALVE
Document Type and Number:
Japanese Patent JP2017210969
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a check valve for a drain hole of a manhole or the like capable of easily stopping or recovering a function of the check valve.SOLUTION: A check valve 11 comprises: a main body case 13 which is cylindrical, in which a male screw part 18 is formed along an outer circumference, and which includes a first flange part 19 expanded outside and a second flange part 24 expanded inside in an upper portion and is threaded with a concrete integrated component; a filter member 14 which is disposed in a lower portion of the main body case; a valve 15 which is disposed so as to be freely idled inside of the main body case, has a semi-spherical shape, and is filled with a foam material 27 for buoyancy therein; a packing 16 which is provided annular along an edge of the second flange part and to which the valve can be adhered; and a cover member 17 which can be positioned in an upper portion of the packing, separated from the packing, and disposed so as to perform drainage or tightly disposed in a water cutoff state.SELECTED DRAWING: Figure 3
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Inventors:
NISHIBORI WATARU
WATABE YUICHI
WATABE YUICHI
Application Number:
JP2016102248A
Publication Date:
November 30, 2017
Filing Date:
May 23, 2016
Export Citation:
Assignee:
FUKOKU SEKIYU KK
MANHOLE COMMERCIAL FIRM CO LTD
MANHOLE COMMERCIAL FIRM CO LTD
International Classes:
F16K31/22; E02D29/12; E03F7/04; H02G9/10
Domestic Patent References:
| JP2011066997A | 2011-03-31 | |||
| JP2010248775A | 2010-11-04 | |||
| JP2000291037A | 2000-10-17 | |||
| JP2000324669A | 2000-11-24 |
Foreign References:
| US4296778A | 1981-10-27 | |||
| WO2015019426A1 | 2015-02-12 |
Attorney, Agent or Firm:
Patent Business Corporation Tokyo Alpa Patent Office