Title:
PIPING STRUCTURE WITH CHECK-VALVE
Document Type and Number:
Japanese Patent JP2016211627
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a piping structure including a check-valve closing a closed part with its resiliency in which the check-valve is prevented from generating whistle-like sound when negative pressure is generated at a downstream side of the check-valve.SOLUTION: In a piping structure with a check-valve 1 installed in piping where fluid passes to prevent inverse flow in the piping, the check valve 1 has a closing part formed by an abutting surface made of elastic raw material that is abutted against a wall surface, the closing part closes a piping flow passage while the abutting surface abuts against the wall surface under a state in which stress does not act against the check-valve 1. When an upstream side of the check-valve shows a higher pressure as compared with that of the downstream side, the abutting surface is moved away from the wall surface to open the piping flow passage to allow fluid to pass from the upstream side to the downstream side. An intake part 3 for intaking surrounding air outside the piping is provided at the downstream side of the check-valve 1.SELECTED DRAWING: Figure 2
Inventors:
KUBONAI HIDEKI
NISHINA TAKASHI
NISHINA TAKASHI
Application Number:
JP2015093689A
Publication Date:
December 15, 2016
Filing Date:
April 30, 2015
Export Citation:
Assignee:
MARUICHI CORP
International Classes:
F16K15/14; E03C1/298; F16K15/16
Domestic Patent References:
| JPH06101257A | 1994-04-12 | |||
| JPH07268922A | 1995-10-17 | |||
| JP2010031546A | 2010-02-12 | |||
| JP2016196744A | 2016-11-24 | |||
| JP2010270839A | 2010-12-02 |