NZ778570B2

NZ778570B2 - Low-torque water shutoff-type line stopping valve using stepwise pressure point support

Info

Publication number: NZ778570B2
Application number: NZ778570A
Authority: NZ
Inventors: Dong Ryul Gu; Hyun Bae Hong; Jae Hyun Kim
Original assignee: Jae Hyun Kim
Filing date: 2019-08-20
Publication date: 2024-02-27

Abstract

The present invention relates to a low-torque water shutoff-type line stopping valve using stepwise pressure point support, and method for enabling construction without shutting off water when a pipe is replaced or repaired. It is known that 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 due to external impact applied to the pipe which can cause water stopping performance degradation. 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. The rubber member in the disc of the present invention comprises a perforated area closing part inserted into the hole of the pipe so as to perform a closing function, and an inner area blocking part configured to extend in the downward direction of the closing part and to have a narrower width than the closing part so as to cut off the inside of the pipe; wherein the inner area blocking part is formed to bend along the inner shape of the pipe, and includes a sweeping groove part configured to be concave in a V-shape and formed on an entirety of an inner pipe-engaging surface that is oriented perpendicular to a longitudinal axis of the pipe and along one side of the inner pipe-engaging surface that is oriented parallel to the longitudinal axis of the pipe; The disc of the present invention also comprises an auxiliary groove part (24a) and a sweeping groove part (12a). The present invention reduces 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; and improves water stopping performance.

Claims

CLAIMS ?

1. A low-torque water shutoff-type line stopping valve using stepwise pressure point support, comprising a valve 5 body mounted on a pipe so as to surround a circumference thereof; a cutting apparatus temporarily mounted in an opening of an upper hemispheric body of the valve body and configured to form a hole in an outer diameter surface of the pipe; and a bonnet mounted at an upper portion of the 10 valve body so as to interference-fit a multistage-type disc into the pipe, wherein the line stopping valve comprises: the low-torque water shutoff-type multistage-type disc configured to be easily adhered to an inner surface of the 15 pipe so as to support the inner surface of the pipe while removing foreign substances from the inner surface of the pipe, and thus to reduce torque about a stem at an upper portion of the multistage-type disc required for water stoppage compared to a conventional disc so as to be capable 20 of stopping water using lower torque, wherein the multi-stage disc: comprises a rubber member and a casting member; wherein the rubber member comprises a perforated area closing part inserted into the hole of the pipe so as to 25 perform a closing function, and an inner area blocking part configured to extend in the downward direction of the closing part and to have a narrower width than the closing part so as to cut off the inside of the pipe; wherein the inner area blocking part is formed to bend 5 along the inner shape of the pipe, and includes a sweeping groove part configured to be concave in a V-shape and formed on an entirety of an inner pipe-engaging surface that is oriented perpendicular to a longitudinal axis of the pipe and along one side of the inner pipe-engaging surface that 10 is oriented parallel to the longitudinal axis of the pipe; when the multi-stage disc comes into contact with the inner surface of the pipe so as to block a flow path, two points of the multistage-type disc initially come into 15 contact with and are supported by the inner surface of the pipe, then the two points supported by pressure sweep away from each other and in the direction of a longitudinal axis of the pipe, and thus the multistage-type disc finally achieves surface contact with and is supported by the inner 20 surface of the pipe so as to remove the foreign substances from the inner surface of the pipe and thus to clean an area of the pipe which comes into contact with the multi stage- type disc. 25

2. A low-torque water shutoff-type line stopping valve using stepwise pressure point support according to claim 1, wherein the rubber member further comprises: a first step formed between the perforated area closing part and the inner area blocking part and configured to have 5 a slope so as to form a wide top and narrow bottom structure; guide parts configured to protrude from both sides of the perforated area closing part and to have one flat surface, and guided along an inner wall of the bonnet; a column configured to extend upwards from the 10 perforated area closing part; and a bracket located on the column.

3. A low-torque water shutoff-type line stopping valve using stepwise pressure point support according to claim 1 15 or 2, wherein the inner area blocking part further includes: a shape-maintaining protrusion configured to protrude convexly in a V-shape and formed in a portion of the inner pipe-engaging surface that is oriented parallel to the longitudinal axis of the pipe and is absent the sweeping 20 groove part.

4. A low-torque water shutoff-type line stopping valve using stepwise pressure point support according to claim 2 or 3, wherein the casting member comprises: 25 a bracket connected to a stem of the bonnet; a column configured to extend downwards from the bracket; a closing part frame formed at a lower portion of the column and configured to have the same shape as the perforated area closing part and a smaller size than the 5 perforated area closing part so as to be located inside the perforated area closing part; a second step formed to have a stepped shape so as to be located inside the first step of the rubber member; second guide parts configured to protrude upwards from 10 both sides of the closing part frame so as to be located inside the guide parts of the rubber member; and a blocking part frame formed at the lower portion of the closing part frame and located inside the inner area blocking part of the rubber member, 15 wherein the blocking part frame comprises an auxiliary groove part configured to be concave inwards and formed on lower and side surfaces thereof.

5. A low-torque water shutoff-type line stopping valve 20 using stepwise pressure point support according to claim 3 or 4, wherein: the shape-maintaining protrusion is formed on the portion of the inner pipe-engaging surface that is oriented parallel to the longitudinal axis of the pipe and is absent 25 the sweeping groove part; and the shape-maintaining protrusion comes into direct contact with the inner surface of the pipe so as to block the flow path, and prevents the sweeping groove part from spreading when the sweeping groove part is returned to an 5 original shape thereof after use of the disc valve.