JPH01180069U

JPH01180069U -

Info

Publication number: JPH01180069U
Application number: JP7662688U
Authority: JP
Priority date: 1988-06-09
Filing date: 1988-06-09
Publication date: 1989-12-25

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例に係る逆流防止弁の
水流停止時の縦断面図であり、第２図はその通水
時の縦断面である。１…ケーシング、２…弁室、３…弁部材、４…
逆止バネ、５…入口、６…出口、７…連通路、８
…ドレン路。 FIG. 1 is a longitudinal sectional view of a check valve according to an embodiment of the present invention when water flow is stopped, and FIG. 2 is a longitudinal sectional view of the check valve when water flow is stopped. 1...Casing, 2...Valve chamber, 3...Valve member, 4...
Check spring, 5...Inlet, 6...Outlet, 7...Communication path, 8
...Drain path.

Claims

[Scope of utility model registration request]

A casing, a cylindrical valve chamber formed in the casing, a valve member inserted into the valve chamber so as to be displaceable in the axial direction of the valve chamber, and a check spring that biases the valve member toward one end of the valve chamber. , an inlet that is opened at one end of the valve chamber and communicates with the upstream side, an outlet that is opened at the other end of the valve chamber and communicates with the downstream side, and one end of the valve chamber and the other end of the valve chamber are communicated with each other outside the valve chamber. Comprising a communication passage and a drain passage opened in the middle part of the valve chamber and communicating with the atmosphere,
When the valve member is displaced toward one end of the valve chamber by the valve closing spring, the inlet and the communication passage are blocked by the valve member, and the outlet and the drain passage are located at the other end of the valve chamber than the valve member. When the water flowing in from the inlet displaces the valve member toward the other end against the check spring due to its dynamic pressure, the inlet and the communication passage are communicated with each other. A backflow prevention valve characterized in that the drain passage is configured to be blocked from the inlet and the outlet by the valve member.