LOW-TORQUE WATER SHUTOFF-TYPE LINE STOPPING VALVE USING STEPWISE PRESSURE POINT SUPPORT

Title:

LOW-TORQUE WATER SHUTOFF-TYPE LINE STOPPING VALVE USING STEPWISE PRESSURE POINT SUPPORT

Document Type and Number:

WIPO Patent Application WO/2020/159023

Kind Code:

A1

Abstract:

The present invention relates to a low-torque water shutoff-type line stopping valve using stepwise pressure point support and, particularly, to: a line stopping valve for a line stopping method, the valve being used for the line stopping method enabling construction without shutting off water when a pipe is replaced or repaired; and a disc for low-torque water shutoff, to be used for the line stopping valve. Normally, foreign material is inevitably generated on the inner wall inside a pipe as time passes, and the foreign material is unavoidably generated during an operation such as pipeline repair. The foreign material floats in the pipe because of external impact applied to the pipe, the flow of fluid or the like, and a large amount of the foreign material accumulates on the inner bottom of the pipe because of gravity. Therefore, the water stopping performance of the valve disc mounted in the pipe decreases, and performance degradation worsens according to the elapse of time after the disc is mounted. Specifically, unlike a conventional valve providing method using a water stopping surface of the disc as a main body of the valve, the line stopping valve using the inner wall of the pipe as the water stopping surface, as in the present invention, has a more serious problem of water stopping performance degradation due to the foreign material. However, the disc, according to the present invention, is supported while removing the foreign material formed on the inner surface of the pipe, so as to improve support power and airtightness since, when the disc comes in contact with the inner side of the pipe so as to block a flow path, first two points come in contact with and are supported by the inner surface of the pipe, and then the two points supported by pressure sweep the inner surface of the pipe outward, thereby finally achieving surface contact with and support by same, and protrudes to support the pipe in the center after making surface contact and being supported, thereby enabling airtightness to be more improved. Therefore, a multi-stage type disc according to the present invention can have effects of enabling water stopping while sweeping out the foreign material, which disrupts water stopping, by using horizontally dispersed power, according to the interaction of an auxiliary groove part (24a) and a sweeping groove part (12a) from the time point at which the disc comes in contact with the bottom surface of the pipe; reducing the power required for water stopping to be lower than that of a conventional disc so as to be capable of stopping water by using lower torque, so that a low-torque water shutoff-type disc can be provided; and enabling the problem of water stopping performance degradation caused by the foreign material to be resolved.

Inventors:

KIM JAE HYUN (KR)
HONG HYUN BAE (KR)
GU DONG RYUL (KR)

Application Number:

PCT/KR2019/010549

Publication Date:

August 06, 2020

Filing Date:

August 20, 2019

Export Citation:

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Assignee:

KIM JAE HYUN (KR)

International Classes:

F16K3/314; F16K3/28; F16K27/04

Foreign References:

KR101157077B1	2012-06-21
JPS59147169A	1984-08-23
KR101067247B1	2011-09-27
KR101620049B1	2016-05-23
EP3321550A1	2018-05-16
KR980005477A	1998-03-30
KR101839729B1	2018-03-16
KR101067247B1	2011-09-27
KR101577777B1	2015-12-15
KR101157077B1	2012-06-21

Other References: