Title:
POSITIVE/NEGATIVE PRESSURE RELIEF DEVICE FOR DRAIN PIPE
Document Type and Number:
Japanese Patent JP2019206901
Kind Code:
A
Abstract:
To provide a positive/negative pressure relief device for a drain pipe that can suppress the emission of bad odor while making it possible to cope with both positive and negative pressures inside the drain pipe with a simple structure.SOLUTION: A positive/negative pressure relief device 1 for a drain pipe comprises: a cylindrical main body section 2 which is connected to a drain pipe 4 at one end side and into which external air can flow at the other end side; and volume variation means 3 which partitions the main body section 2 into an intake side area 2a into which external air flows and a drain pipe side area 2b into which air from the drain pipe 4 flows, and which allows variation of volume of the drain pipe side area 2b in the main body section 2 by variation of air pressure in the drain pipe 4. The volume variation means 3 has a check valve 10 that allows external air to flow into the drainage pipe side area 2b and suppresses discharge of air from the drain pipe 4 to the intake side area 2a.SELECTED DRAWING: Figure 1
Inventors:
IRISAWA TORU
Application Number:
JP2019015620A
Publication Date:
December 05, 2019
Filing Date:
January 31, 2019
Export Citation:
Assignee:
SANKEI SUPPORT KK
International Classes:
E03C1/122; E03C1/298; F16K24/06
Attorney, Agent or Firm:
Akio Iida
Michiko Ema
Chiori Ueda
Toshiyuki Ando
Michiko Ema
Chiori Ueda
Toshiyuki Ando