JP2002022059A - Gate valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry a fluid leaked to the downstream of a valve element to the outside so that the shut-off property of a conduit by the valve element can be confirmed. SOLUTION: A communicating groove 15 communicating with the inside and the outside of the conduit is formed on the downstream circumferential surface of an operation rod 10 for supporting the valve element 1, and the fluid leaked to the downstream of the valve element 1 is carried to the outside through the communicating groove 5 and detected by a detecting means (pressure gauge) 24 mounted on a guide case 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate valve device for shutting off a line of a branch connecting pipe attached to a fluid pipe through which a fluid flows, and more particularly, to detecting a fluid leaking to a downstream side. The present invention relates to a gate valve device capable of confirming fluid shutoff.

[0002]

2. Description of the Related Art For example, in a method of connecting a branch pipe to a main pipe without interrupting the flow of fluid in the main pipe, the applicant of the present invention discloses a connecting pipe attached to the main pipe in Japanese Patent Laid-Open No. 6-8196.
The sluice valve device already proposed in Japanese Patent Publication No. 9 is used.

In this gate valve device, a flexible valve element that can be raised and lowered is inserted in a state where it is bent by an insertion hole of a connection pipe attached to the main pipe, and is expanded in a circular shape in the connection pipe to thereby form a circular valve inside the main pipe. The operation of inserting the fluid into the connection pipe is performed after the branch hole is drilled in the main pipe by the drilling device, and the removal of the drilling device and the branch pipe are performed. When the valve body is lifted after the mounting operation of the above is completed, the fluid in the main pipe is branched to the branch pipe side.

[0004]

Since the conventional gate valve device described above does not have a means for checking fluid shutoff, foreign matter may be trapped between the valve body and the connection pipe. When the hermeticity is impaired, the fluid may leak to the downstream side of the valve body and flow out to the outside when removing the perforating device or attaching the branch pipe.

In particular, if the fluid is a flammable gas or a harmful liquid, it is dangerous. Therefore, it is necessary to confirm the shutoff of the fluid before removing the drilling device.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and the fluid leaking to the downstream side of a valve body is caused to flow out to the outside, so that the fluid shut-off property can be easily confirmed. It is intended to provide a gate valve device with high safety.

[0007]

In order to achieve the above object, a gate valve device according to the present invention comprises a connecting pipe for fluid branching attached to a fluid pipe through which a fluid flows, and a cutting pipe attached to the connecting pipe. Or, provided between the drilling device and the drilling device, after opening at least a part of the fluid pipe by these devices, by temporarily blocking the conduit of the connection pipe, the cutting or removal of the drilling device or the like. A gate valve device used when performing, a valve element that is inserted into the conduit of the connection pipe to shut off fluid, or a part of the downstream side of the support member thereof,
According to the present invention having the above configuration, wherein the communication portion communicating with the inside of the pipe and the outside is provided, when the pipe of the connection pipe is cut off by the valve body, the fluid leaked to the downstream side of the valve body is Since it flows out to the outside through the communicating part, it is possible to indirectly confirm the blocking property of the pipeline by the valve body.

[0008] In the gate valve device, the valve body is an elastically deformable and flexible circular seal frame slidably fitted to the operating rod, and an expandable and contractible film-like body for closing an upstream opening surface thereof. A flexible member that can be elastically deformed from an insertion hole formed in the connecting pipe and inserted into a conduit and expanded in the conduit to shut off fluid; A communication groove communicating with the inside and outside of the conduit is formed on one of the downstream sliding contact surfaces of the cylindrical guide member for slidably guiding the insertion hole in the insertion hole. ,
This is preferably a communication part. This way,
Since there is no need to form any communication groove in the flexible valve body, when the valve body is bent, it is prevented from being torn starting from the communication groove portion.

[0009] In the gate valve device, the valve body includes an elastically deformable circular seal frame slidably fitted to the operating rod, and an expandable and contractible film-like body for closing an upstream opening surface thereof. A flexible frame which is elastically deformed from an insertion hole formed in a connecting pipe, inserted into a pipe, and expanded in the pipe so as to block fluid. On the downstream side of the plug portion for tightly plugging the insertion hole formed integrally with, a communication hole communicating with the inside of the pipeline and the outside is drilled,
This is preferably a communication part. This way,
Since the communication hole can be easily formed, the cost can be reduced.

In the gate valve device described above, a case body provided with a fluid detecting means is hermetically attached to the opening outside the insertion hole of the valve body formed in the connection pipe, and the case body flows into the case body through the communication part. Preferably, the fluid is detected by the detection means. By doing so, the fluid such as gas, which has flowed into the case body, can be reliably detected by the detecting means, and safety is enhanced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of a gate valve device of the present invention used in a method of attaching a branch pipe to a main pipe without shutting off fluid, and a flexible valve. The body 1 has a substantially circular cored metal 2, a seal frame 3 made of rubber or the like vulcanized and molded in a ring shape so as to cover the mandrel 2, and is integrally formed with the seal frame 3, and one of the central portions thereof It has a circular film-like body 4 that closes the opening surface (the opening surface on the upstream side in use).

The mandrel 2 comprises a pair of left and right leaf springs 5 and 5 bent in a semicircular shape, and upper and lower ends of each leaf spring 5 are buried guide fittings at the upper and lower parts of the seal frame 3. Pins are pivotally mounted on both left and right sides of the holding member 6 and the holding metal member 7.

On the upper portion of the seal frame 3, an adhesive tube 1 described later is provided.
A cylindrical plug portion 8 for sealing the insertion hole 23 formed in the plug 8 is integrally connected upward.

The outer diameter of the seal frame 3 is slightly larger than the inner diameter of the connecting pipe 18 to be described later, which is to block the fluid.

An operating rod 10 having an operating handle 9 mounted on the upper end thereof is inserted into the guide fitting 6 as a vertically flexible sliding rod. The lower end of the operating rod 10 is fitted into the holding fitting 7.
Screws 11 prevent the screw from coming off and prevent it from rotating.

A cylindrical stopper collar 12 is slidably fitted to the operating rod 10 between the guide fitting 6 and the holding fitting 7. A plurality of notched grooves 13 are provided at the upper end of the stopper collar 12.

An inverted conical projection 14 is formed at the center of the lower surface of the holding fitting 7, and this projection 14 is formed in a portion corresponding to the tip of the projection 14 when the valve body 1 is pushed into the connecting pipe. Is strongly pressed against the inner peripheral surface of the connection pipe to prevent the valve body 1 from being displaced due to fluid pressure.

The outer peripheral surface of the operating rod 10 on the right side (downstream side) of the portion where the guide fitting 6 is inserted into the guide fitting 6 is slightly cut off to form a planing surface, so that a seal frame slightly below the guide fitting 6 is provided. 3, a communication groove 15 communicating with the outside of the valve body 1 above the guide fitting 6 is formed. The lower end of the communication groove 15 communicates with any of the plurality of cutout grooves 13 formed at the upper end of the stopper collar 12.

Next, an example of use of the first embodiment will be described.

As schematically shown in FIG. 3, the gate valve device of the present invention is provided above a connection pipe 18 which is directed sideways at a joint 17 mounted on a main pipe 16 through which a fluid such as gas flows. A cylindrical guide case 19 is hermetically mounted, and is housed in the guide case 19 for use.

The operation of inserting the valve element 1 into the connection pipe 18 is performed after the branch hole 21 is formed in the main pipe 16 by the drilling device 20 mounted on the connection pipe 18.

That is, as shown in the enlarged vertical sectional front view of FIG. 4, the valve body 1 is placed in the guide case 19 such that the membrane 4 is orthogonal to the connecting pipe 18 and the upstream side thereof. After being elastically deformed and inserted, the upper end opening of the guide case 19 is sealed by a closing plate 22 through which the operating rod 10 is inserted.

Next, the operating rod 10 is pushed downward to insert the valve body 1 into the pipe through the insertion hole 23 at the upper part of the connecting pipe 18 so that the lower end of the seal frame 3 contacts the bottom of the pipe. Then, the insertion hole 23 is sealed with the stopper portion 8.

Then, the valve element 1 expands in a substantially circular shape due to the elastic restoring force of the leaf spring 5 in the mandrel 2 as shown by the two-dot chain line in FIG.

At the time of the cutoff, if foreign matter is caught between the outer peripheral surface of the seal frame 3 and the inner peripheral surface of the connection pipe 18 to impair their adhesion, gas from the main pipe 16 is released. Leakage occurs downstream of the valve body 1, and there is a danger in removing the perforating device 20 after shutting off and connecting a branch pipe (not shown).

In the gate valve device of the present invention, when the fluid such as the gas leaks to the downstream side of the valve body 1, the leaked gas is transferred to the stopper collar 12 as shown by an arrow as shown in FIG. Through the notch groove 13 at the upper end of the guide rod 6, and into the guide pipe 19 through the gap at the upper end of the guide fitting 6.

Therefore, for example, the pressure gauge 2
4 to measure the gas pressure in the guide case 19 or to detect a small amount of gas flowing into the guide case 19 by attaching a gas sensor (not shown), thereby connecting the connection pipe 18 by the valve element 1. The blocking property can be easily confirmed indirectly.

When the fluid is a liquid, a small hole may be formed in the lower part of the guide case 19 to visually check whether or not the liquid flows out.

FIG. 5 shows a second embodiment of the present invention. Instead of forming a communication groove 15 in the operation rod 10, a communication hole 25 is formed in the downstream side of the plug portion 8 so as to extend vertically. Then, the fluid leaking to the downstream side of the valve body 1 is caused to flow into the guide case 19 through the communication hole 25.

In this embodiment, the same operation and effect as described above can be achieved, and the communication rod 15 does not need to be formed in the operating rod 10 by machining or the like, so that the cost can be reduced.

FIG. 6 shows a third embodiment of the present invention, in which a hard rubber or the like having a larger cross-sectional area than a conduit is provided between a connecting pipe 18 and a mounting pipe 26 of a drilling device (not shown). A gate valve device 28 having a plate-shaped valve element 27 is interposed, and the fluid leaked downstream through the communication groove 29 formed on the downstream side surface of the valve element 27 is introduced into the upper guide case 30. It is designed to flow in.

Also in the third embodiment, by attaching a pressure gauge, a gas sensor, and the like to the guide case 30,
The fluid blocking performance of the valve body 27 can be easily confirmed.

The present invention is not limited to the above embodiment.

In the first embodiment, the operating rod 10
Instead of omitting the communication groove 15 formed in the
May be formed on the inner peripheral surface on the downstream side in the vertical direction, and a gas or the like leaked to the downstream side may flow out into the guide case 19 through this communication groove.

A part of the guide rod 6 of the operating rod 10 is slightly hollow from the lower end to the upper end thereof, and leaks gas and the like from the communication hole formed from the downstream side toward the lower end of the hollow hole. May be detected by a sensor or the like.

[0037]

According to the present invention, the following effects can be obtained. (A) According to the first aspect of the invention, the fluid leaked to the downstream side of the valve element flows out to the outside through the communication portion.
It is possible to easily and indirectly confirm the blocking property of the pipeline by the valve body.

Therefore, it is possible to prevent the removal of the perforation device or the like in a state where the fluid such as the flammable gas is leaking, and the safety is enhanced. (B) According to the second aspect of the present invention, since it is not necessary to provide a communication groove in the flexible valve body, when the valve body is bent, it is torn starting from the communication groove portion. Is prevented. (C) According to the third aspect of the present invention, since the communication hole can be easily formed, the cost can be reduced as compared with the case where the communication groove is formed by machining the operating rod or the like. (D) According to the invention as set forth in claim 4, since a fluid such as a combustible gas which has flowed into the case body can be reliably detected by the detecting means, safety is further improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view taken along line II-II of FIG.

FIG. 3 is a schematic vertical sectional side view showing an example of use.

FIG. 4 is also a longitudinal sectional front view showing a procedure for inserting a valve body into a connection pipe.

FIG. 5 is a vertical sectional side view of a main part showing a second embodiment of the present invention.

FIG. 6 is a vertical sectional side view showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve body 2 Core metal 3 Seal frame 4 Membrane body 5 Leaf spring 6 Guide metal (guide member) 7 Holding metal 8 Plug part 9 Operation handle 10 Operation rod 11 Screw 12 Stopper collar 13 Notch groove 14 Projection 15 Communication groove 16 Pipe (flow pipe) 17 Joint 18 Connection pipe 19 Guide case (case body) 20 Drilling device 21 Branch hole 22 Closure plate 23 Insertion hole 24 Pressure gauge (detection means) 25 Communication hole 26 Mounting pipe 27 Valve body 28 Gate valve device 29 Communication groove 30 Guide case (case body)

Continuing from the front page (71) Applicant 000105556 Cosmo Machine Co., Ltd. Room 706, 7th floor, New Shimbashi Building, 1-701, 2--16 Shimbashi, Minato-ku, Tokyo (72) Inventor Daisuke Saito 2 Ichikawaminami, Ichikawa-shi, Chiba No. 8-8 Keiyo Gas Co., Ltd. (72) Inventor Goro Kawamura 2-8-8 Kawaminami, Ichikawa-shi, Chiba Pref. Inside Keiyo Gas Co., Ltd. (72) Inventor Yasuhiro Toyota 1-chome Chiyo, Hakata-ku, Fukuoka City, Fukuoka Prefecture 17-1 Inside Seibu Gas Co., Ltd. (72) Inventor Kenji Koshirodo 1-1-1 Chiyo, Hakata-ku, Fukuoka City, Fukuoka Prefecture 17-1 Inside Seibu Gas Co., Ltd. (72) Inventor Tsuyoshi Takamura 2-chome, Shimbashi, Minato-ku, Tokyo 16-1, 1-1701 New Shimbashi Building, Room 706 Cosmo Koki Co., Ltd. In-house (72) Inventor Kensuke Nakazato 2-16-1, Shinbashi, Minato-ku, Tokyo, 1-16-1 New Shimbashi Building, Room 706 Cosmo Koki Stock Association In-house F-term (reference) 3H053 AA02 AA35 BA01 BA18 DA02 3H065 AA03 AA08 BB24 BC01 CA01

Claims (4)

[Claims] 1. A connecting pipe for fluid branch attached to a fluid pipe through which a fluid flows, and a cutting or perforating device attached to the connecting pipe, and at least one of the fluid pipes is provided by these devices. After opening the part, by temporarily blocking the conduit of the connection pipe, a gate valve device used when performing the cutting or removal of the drilling device, etc., in the pipeline of the connection pipe A gate valve device comprising: a valve body that inserts and shuts off fluid; 2. A valve body comprising: an elastically deformable and flexible circular seal frame slidably fitted to an operating rod; and a stretchable film-like body closing an upstream opening surface thereof. A flexible member which is elastically deformed from an insertion hole formed in a connecting pipe, is inserted into a conduit, and is expanded in the conduit so as to block a fluid. A communication groove communicating with the inside of the pipeline and the outside is formed on one of the sliding surfaces on the downstream side of the cylindrical guide member that slidably guides the insertion hole portion. The gate valve device according to claim 1, wherein the gate valve device is a communication part. 3. The connecting pipe, wherein the valve body comprises an elastically deformable circular seal frame slidably fitted to the operating rod, and an expandable and contractible membrane state for closing an upstream opening surface thereof. A flexible member that is elastically deformed from an insertion hole formed in the seal frame and inserted into a conduit and expanded in the conduit to block a fluid, and is formed integrally with the seal frame. 2. The gate valve device according to claim 1, wherein a communication hole that communicates with the inside of the pipeline and the outside is formed on a downstream side of the plug portion that plugs the insertion hole, and the communication hole is used as the communication portion. 4. A case body provided with a fluid detecting means is hermetically attached to an opening outside the insertion hole of the valve body formed in the connection pipe, and the fluid flowing into the case body through the communication part is provided.
4. The gate valve device according to claim 1, wherein the gate valve is detected by a detecting unit.