JP2502619Y2 - Flow path switching valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, for example, existing pipes such as water pipes should be partially replaced with new pipes, or repairs should be performed by newly installing valves in the existing pipes. In this case, as shown in FIG. 4, the branch pipe (1 ') bypassing the repair location (A) is connected in advance to the existing pipe (1) in the uninterrupted water state to repair the repair location (A). Until the end of, the water flow to the repair point (A) is stopped while maintaining the water flow by the branch pipe (1 '), and after the repair, the water flow to the repair point (A) can be restarted. The present invention relates to a flow path switching valve which is used for connecting and connecting an existing pipe (1) and a branch pipe (1 ') and is not removed after repairing but remains as it is.

[Conventional technology]

This kind of flow path switching valve is used for the purpose of temporarily blocking the flow path of the existing pipe for a short period until the repair of the repaired part is completed, and it is not used on the premise of repeated operation of the valve body. Therefore, there is a demand to simplify the valve body structure and reduce the cost without deteriorating the sealing performance of the valve body.

Therefore, if an attempt is made to open a valve element that receives a large fluid pressure from the existing piping side at the blockage action position of the branch side flow passage against the fluid pressure, a large operation is applied to the valve element that tries to separate from the valve seat. Paying attention to the point that the valve body is easily deformed by the reaction force and the sealing property at the closing action position of the repair side flow passage is impaired, as shown in FIG. A communication passage (022) that connects the existing pipe (1) and the branch pipe (1 ') in a state of bypassing the valve is provided, and repair is performed from the block action position of the branch side flow passage (0A3) of the valve body (011). Prior to the switching operation of the side passage (0A2) to the closing action position, the opening / closing valve (021) is opened, and the existing pipe (1) side and the branch pipe (1 ') side of the valve body (011) are almost opened. The valve body (01
Prevents deformation caused by the switching operation of 1), and
The bending strength required in 11) is minimized to simplify the valve body structure.

[Problems to be solved by the device]

Therefore, it is necessary to open a hole in the pipe that constitutes the existing pipe at the site in the uninterrupted water state and connect the pipe that constitutes the communication path to the hole by welding means, etc. Not only that, but especially if you want to easily connect by welding, there is a drawback that the welding construction conditions are poor due to the leakage of fluid such as water from the hole, and it is difficult to obtain sufficient connection strength. If the communication passage is left as it is after the completion of repair of a part, there is a possibility that the part will be damaged due to aging and the fluid will leak out.

The present invention has been made in view of the above situation, and it is not necessary to provide a communication passage each time at the site, and even if the communication passage is left as it is, fluid may leak from the connecting portion due to aging. It is an object of the present invention to provide a flow path switching valve with a small number.

[Means for Solving the Problems] A characteristic configuration of the present invention for achieving the above-mentioned object is a valve box interposed in the middle of an existing pipe, and a pipe portion of the existing pipe that does not have a repaired portion. And a connection portion for a pipe portion having a repair portion, and a branch pipe connection portion to which a branch pipe bypassing the repair portion of the existing pipe is connected, and the repair portion is provided in the valve box. With respect to the non-repair side flow passage on the side of the pipe portion not having, a branch side flow passage continuous to the branch pipe side, and a repair side flow passage continuous to the pipe portion having a repair portion of the existing pipe In a flow path switching valve having one flow path changing valve body that can be selectively connected, the non-repair side flow path in a state where the flow path changing valve body closes the branch side flow path. And a communication passage for allowing a part of the fluid of A valve capable of switching the passage between a communication state and a non-communication state is provided, and the communication passage is provided in the valve box over a space communicating with the non-repair side flow passage and a space communicating with the branch side flow passage. There is a point.

The flow path changing valve body may be provided so as to be able to selectively close three flow paths facing the junction between the existing pipe and the branch pipe, and the non-repair side flow path of the existing pipe. It is advisable to provide the space connected to the above in a space formed inside the three closing positions of the flow path changing valve body.

[Action]

Prior to the switching operation from the closing action position of the branch side flow passage of the valve body to the closing action position of the repair side flow passage, it is possible to keep the existing pipe side and the branch pipe side of the valve body at substantially equal pressure. The communication passage is provided in the flow passage switching valve in advance, so that the communication passage can be provided in the flow passage switching valve under optimum construction conditions.

[Effect of device]

Therefore, it is possible to save the time and effort required for on-site construction, and moreover, it is easy to obtain a predetermined connection strength. Therefore, even if the communication passage is left as it is, there is little possibility that the fluid will leak from the connection portion due to aging.

The flow path switching valve according to claim 2, wherein the valve body is provided so as to selectively block three flow paths facing the junction between the existing pipe and the branch pipe, and the space on the side of the existing pipe. Is a space formed inside the three closing positions of the valve body, and therefore, when connecting to any existing pipe on the upstream side or the downstream side of the repair location, the branch pipe bypassing the repair location. There is an advantage that it is possible to connect to the existing pipe by selecting a connection posture that is convenient for the connection.

Moreover, even if either side of the existing pipe is closed with the valve body,
Since the communication passage is communicated with the side through which the fluid flows, for example, the communication passage is a repair side flow passage in the existing pipe, as in the case where the communication passage is communicated with the valve body outside the closing action position, It is not necessary to close the communication passage after switching the repair side flow path of the valve body to the blocking action position to prevent fluid from leaking to the repair location side, and it can be handled easily.

[Example] As shown in Fig. 4, the pipe portion (1B) having the repaired portion (A) of the existing water pipe (1) (an example of the existing pipe) is removed to replace the pipe portion (1B) with a new pipe. In the water supply work to be renewed to, a bypass water pipe (1 ') (an example of a branch pipe) that bypasses the repair location (A) is connected in advance to the existing pipe (1) through the flow path switching valve (9), Until the repair work to the repair place (A) is completed by shutting off the water flow to the repair place (A) side by the flow path changing valve body (11) of the flow path switching valve (9).
Detour water pipe (1 ') instead of the pipe part (1B) to be removed
It is configured to maintain water flow.

The flow path switching valve (9) is a connection device provided with a closed case (2) and is connected to the existing pipe (1) in a water-free state.

As shown in FIG. 3, the closed case (2) is attached to the existing pipe (1) to form a closed space (3) with the outer peripheral surface of the existing pipe (1). And a cutting device (4) for switching and removing a pipe portion of an appropriate length located inside the existing pipe (1) when installed.
The existing pipe (1) is equipped with a pipe working port (5) for inserting
It is divided into a plurality of parts in the circumferential direction so that it can be attached and detached.

A valve (6) is attached to the pipe working port (5), and the valve (6) has a size such that the cutting device (4) can be installed inside the cutting device (4). A water blocking case (8) slidably held through an operating shaft (7) for insertion into and removal from the sealed case (2) is detachably attached.

Therefore, as shown in FIG. 3 (a), the valve (6) is opened and the cutting device (4) is inserted and moved into the closed case (2) to move the pipe portion of the existing pipe (1) of an appropriate length. Cut and cut the cutting device (4) together with the cut portion of the water stop case (8)
The valve (6) is closed after being pulled up to the inside so that cutting work can be performed while water is being passed through the existing pipe (1).

The flow path switching valve (9) is for connecting the upstream cut end of the cut end of the existing pipe (1) formed by the cutting to the end of the bypass water pipe (1 '). Specifically, the non-repair side flow path (A1) connected to the upstream side of the existing pipe (1), the repair side flow path (A2) connected to the repair location (A) side, and the bypass water pipe Flow path changing valve body (11) for selectively blocking the branch side flow path (A3) connected to the (1 ') side
It is configured with a three-way valve equipped with.

The flow path switching valve (9) composed of the three-way valve is the first
As shown in FIG. 2 and FIG. 2, a valve box (10) of a size that can pass through the counter pipe working port (5) of the closed case (2) and a rotary type installed in the valve box (10). And the flow path changing valve body (11).

The valve box (10) has a flange (10a) as a connecting portion for a pipe portion (1A) of the existing pipe (1) that does not have a repair portion (A), and a repair portion (A). Flange (10a) as a connection to the broken pipe (1B)
And a flange (10b) as a branch pipe connecting portion to which the branch pipe (1 ') bypassing the repaired portion (A) of the existing pipe (1) is connected. That is, this valve box (10)
Is provided with a first tube (10A) for forming a passage in which a flange (10a) as a connecting portion for communicating with the cut end of the existing pipe (1) is continuously provided near both ends. (Ten
A second sheet cylinder (10B) is fixed to the middle portion in the longitudinal direction of (A) in a state of traversing in the radial direction, and is attached to the peripheral wall of the second cylinder (10B) at the end of the bypass water pipe (1 '). A first cylinder (10A) and a second cylinder (10) are provided with a third pipe (10C) for forming a passage, which is provided with a flange (10b) as a branch connection portion for communicating connection.
B) and the upstream side flow passage (A) in the first cylinder (10A)
A first opening (S1) for communicating 1) with the second cylinder (10B);
The second opening (S2) that connects the repair side flow passage (A2) in the first cylinder (10A) to the second cylinder (10B) and the branch side flow passage (A3) in the third cylinder (10C). A third opening (S3) communicating with the second cylinder (10B) is formed.

The second cylinder (10B) has its axial center (X) connected to the first cylinder (10B).
It is arranged so as to be displaced toward the third cylinder (10C) side with respect to the axis (Y) of A).

The flow path changing valve body (11) has a pair of upper and lower split cylinder-shaped blocking plates (11A) formed in an arcuate cross section with a radius of curvature larger than the radius of the second cylinder (10B). Fan-shaped arm (11C)
Is connected to the valve stem (11B) via the
A reinforcing rib (11D) is continuously provided on the outward curved surface side of A).

Then, the valve rod (11B) is supported by the lid (10D) that closes both ends of the second cylinder (10B), and the flow path changing valve body (1
In the state in which the shield plate (11A) peripheral edge and the arm (11C) radial end face of 1) are slid along the inner peripheral surface of the second cylinder (10B), the second cylinder (10B) By rotating around the axis (X), a first closing action position for closing the first opening (S1) and a second closing action position for closing the second opening (S2) and the third opening (S3). ) Is selectively switched to the third closing position.

Incidentally, (12) is a sealing material for sealing between the valve box (10) and the flow path changing valve body (11), and is attached to the flow path changing valve body (11), It may be attached to the valve box (10).

A valve capable of switching the space (A4) on the side of the existing pipe sandwiching the valve body (11) for changing the flow path at the third closing position and the branch side flow path (A3) between a communication state and a non-communication state. A communication passage (22) provided with (21) is a lid (10) for the third cylinder (10C) and the second cylinder (10B).
Even if the flow path changing valve body (11) is switched to either of the first and second closing action positions, the communication path (22) is in the water flow path. It is configured to communicate.

As shown in FIGS. 1 and 3, the cut ends of the existing pipe (1) and both ends of the first cylinder (10A) of the flow path switching valve (9) positioned concentrically with the cut ends. A seal ring (13) is fitted slidably in the axial direction so as to close the gap between the cut end and both ends of the first tubular portion (10A), and the seal ring (13) is attached to the shaft. A screw shaft (14) that slides in the core direction is provided so as to penetrate the sealed case (2).

The seal ring (13) has a flange (13a) for joining to the flange (10a) of the first cylinder (10A) via a bolt and nut (15), and the seal ring (1a).
The seal ring (13) is pushed between the 3) and the cut end.
A flange (13b) for joining via a bolt and a nut (18) to a push ring (17) that presses and fixes a packing (16) that fixes the seal to the cut end in a sealed state is provided. In addition, (19) is an O-ring for stopping water held on the inner periphery of the seal ring (13), and (20) is a flange (13a) of the seal ring (13) and the first cylinder (10A). , (10a) is a waterproof packing.

The flow path switching valve (9) that is connected to the water passage downstream side of the existing pipe (1) also has the same structure, and only the relative positional relationship with the repair location (A) is different, so detailed description thereof is omitted. To do.

[1] As shown in FIG. 3 (a), the valve (6) is opened, the cutting device (4) is inserted into the closed case (2) and moved, and a pipe of an appropriate length of the existing pipe (1) is moved. Cut the part.

[2] After pulling the cutting device (4) and the cut pipe portion up to the inside of the water blocking case (8) and closing the valve (6),
The water shut-off case (8) is removed from the valve (6), the flow path changing valve element (11) is located at the third closing action position on the operation shaft (7) of the water shut-off case (8), and The cutting device (4) for the flow path switching valve (9), which switches the passage (22) to the non-communication state.
After mounting instead of, the waterproof case (8) is mounted on the valve (6) as shown in FIG.

[3] As shown in FIG. 3C, the valve (6) is opened to connect the flow path switching valve (9) to the switching end in the closed case (2), that is, the valve box (10). ) First cylinder (10A) is inserted to a position where it is positioned on the same axis as the cut end, and the screw shaft (14) is operated to fit the seal ring (13) onto the cut end only. Slide from the position to the connection position where the cut end and the end of the first tubular portion (10A) are externally fitted,
The flow path switching valve (9) is temporarily connected to the cut end.

[4] As shown in FIG. 3 (d), the closed case (2) is removed from the existing pipe (1) to expose the flow path switching valve (9), and the flow path switching valve (9) and the seal ring ( The flange (10a), (13a) with 13) are connected, the push ring (17) and the seal ring (13) are connected, and the flow path switching valve (9) is permanently installed in the existing pipe (1). .

[5] After connecting the bypass water pipe (1 ') to the flow path switching valve (9), the communication path (22) is switched to a communication state, and water is preliminarily supplied into the branch side flow path (A3) to branch. Operate the flow path changing valve element (11) to switch to the second closing action position while keeping the inside pressure of the side flow path (A3) almost equal to that of the existing pipe side space (A4). The bypass water pipe (1 ') is made to communicate and the pipe portion (1A) is removed in the uninterrupted water state.

[6] After replacing the pipe portion (1A) with a new pipe, the flow path changing valve body (11) of the flow path switching valve (9) is switched to the third closing action position, and the flow path switching valve (9) Is left in a state of being connected to the existing pipe (1).

The bypass water pipe (1 ') may be removed if the sealing property of the flow path changing valve body (11) at the third closing action position at this time is reliable or almost reliable. In this case, the flange ( A branch plate is attached to 10b) and the branch side flow path (A3) is completely blocked.

[Another embodiment]

I. As shown in FIGS. 5, 6 (a) and 6 (b), it passes through the inside of the wall thickness of the flow path changing valve body (11) and communicates with the front and rear of the flow path changing valve body (11). The communication passage (22) is formed, and the valve rod (11B) is attached to the flow path changing valve body (11) so as to be relatively rotatable only within a certain range, as shown in FIG. , A groove (2 formed in the valve stem (11B) by rotating the valve stem (11B) to a fixed position with respect to the flow path changing valve body (11).
2a) is communicated with the communication passageway (22), the communication passageway (22) is switched to the communication state, and as shown in FIG. 6 (b), valve stem operation when closing the repair side passageway (A2) The valve (21) for switching to the non-communication state may be configured by.

B. The communication passage (22) may be formed within the thickness of the valve box.

C. Of the three flow paths facing the confluence of the existing pipe and the branch pipe, a flow path changing valve body that selectively blocks only the two flow paths of the branch side flow path and one of the existing pipes was provided. It may be a flow path switching valve.

D. It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the flow path switching valve according to the present invention. Fig. 1 is a vertical plan view of a main part, Fig. 2 is a cross-sectional view of the main part, and Figs. 3 (a) to 3 (d) are connections. Fig. 4 is an explanatory view of the construction work and is a plan view of the usage state. 5 and 6 show another embodiment,
FIG. 5 is a sectional view of an essential part, and FIGS. 6 (a) and 6 (b) are vertical plan views of an essential part. FIG. 7 is an explanatory diagram of a conventional example. (1) …… Existing piping, (1 ′) …… Branching pipe, (10a)…
… Connection part, (10b) …… Branch connection part, (11) …… Flow path changing valve body, (A) …… Repair location, (A1), (A2), (A
3) …… flow path, (A4) …… space, (21) …… valve body, (2
2) …… A passage.

Claims (2)

(57) [Scope of utility model registration request] 1. A connection to a pipe part (1A) of the existing pipe (1) which does not have a repairing part (A), in a valve box (10) interposed in the middle of the existing pipe (1). Part (10a),
A branch pipe connection part to which a connection part (10a) for a pipe part (1B) having a repair part (A) and a branch pipe (1 ') bypassing the repair part (A) of the existing pipe (1) are connected. (Ten
b) is provided, and the branch pipe (1) is provided in the valve box (10) with respect to the non-repair side flow path (A1) on the pipe portion (1A) side not having the repair portion (A). 1 ') side branch side flow path (A3) and repair side flow path (A) connected to the pipe portion (1B) of the existing pipe (1) having the repair location (A).
2) One flow path changing valve body (1
1) In the flow path switching valve including the above, a part of the fluid of the non-repair side flow path (A1) in a state where the flow path changing valve body (11) closes the branch side flow path (A3). Is provided with a communication passage (22) for allowing the flow into the branch side flow passage (A3), and a valve (21) capable of switching the communication passage (22) between a communication state and a non-communication state, The communication passage (22) is provided in the valve box (10) over a space communicating with the non-repair side flow channel (A1) and a space communicating with the branch side flow channel (A3). A flow path switching valve. 2. The three flow passages (A1), (A2), () in which the flow passage changing valve body (11) faces a confluence portion of the existing pipe (1) and the branch pipe (1 '). A3) is provided so that it can be selectively closed, and the space (A4) connected to the non-repair side flow path (A1) of the existing pipe (1) is closed by the flow path changing valve body (11). The flow path switching valve according to claim 1, which is a space formed inside the operating position.