JP6706358B2 - Valve device - Google Patents

Description

The present invention relates to a valve device in which a fluid pipe is cut by a cylindrical cutter in a casing that encloses the fluid pipe in a hermetically sealed manner, and the fluid pipe can be mounted in the casing in a non-discontinuous state.

In a conventional valve device that cuts a fluid pipe with a cylindrical cutter in a casing that encloses a fluid pipe in a hermetically sealed manner and that can be mounted in the casing in an undisturbed state, in order to reduce the size and weight of the casing, The fluid pipe is cut by cutting the fluid pipe with a cylindrical cutter having a diameter as small as possible, the valve body is directly inserted into the housing, and the housing is blocked by the valve body to control the flow in the fluid pipe.
(For example, refer to Patent Document 1).

Japanese Patent Publication No. 2006-515406 (page 6, FIG. 1-5)

In Patent Document 1, since the fluid pipe is cut using a small-diameter cylindrical cutter, the separation distance of the portion where the cut surface of the fluid pipe comes closest is small, and the valve body is directly attached to the housing. I had to insert it. However, if the valve body is inserted directly into the housing, the turbulence of the fluid flowing inside the housing will increase, and the pressure loss will increase, as well as the force acting on the valve body due to the pressure difference across the valve body will increase. There is a possibility that the reliability of the product may decrease.

The present invention has been made in view of such a problem, and the fluid pipe is cut by a cylindrical cutter in a casing that surrounds the fluid pipe in a hermetically sealed state, and the fluid pipe is inserted into the casing in an undisturbed state. It is an object of the present invention to provide a valve device that can be attached and that can reduce pressure loss even when the distance between the cut surfaces of the fluid pipe is small and that has a long-term reliability.

In order to solve the above problems, the valve device of the present invention is
A valve device comprising: a casing that encloses a fluid pipe in a sealed manner; and an inserter that cuts the fluid pipe in the casing with a cylindrical cutter and that can be inserted into the casing in an undisturbed state. The insert body includes a valve body and a valve seat body having a valve seat hole portion, and the valve body can open and close the valve seat hole portion to control fluid. The width of the base end portion in the pipe axis direction is formed to be larger than the width of the valve seat body in the pipe axis direction at the position closest to the cut surface of the fluid pipe.
According to this feature, the insert body including the valve body and the valve seat body that can be inserted into the closest part of the fluid pipe cut surface cut by the cylindrical cutter is the base end side of the valve seat body. Has a large width in the axial direction of the pipe, and the separation width between the relevant portion and the cut surface of the fluid pipe can be minimized, so that turbulence of the flow in the housing can be suppressed, pressure loss can be reduced, and eventually the valve device The acting force can be reduced and long-term reliability can be secured.

The valve device of the present invention is
It is characterized in that the valve seat body has a valve seat body inclined surface which is opposed to the fluid pipe cut surface and is tapered in a direction in which the valve seat body is inserted.
According to this feature, the surface of the valve seat facing the cut surface of the fluid pipe has the valve seat tilted surface that is tapered in the direction in which the valve seat is inserted. The provided valve device can be inserted into the housing, and the base end portion of the valve seat body, which has a large pipe axis direction width formed by the valve seat body inclined surface, reduces the separation width between the valve seat body and the fluid pipe cut surface. Therefore, the disturbance of the flow in the housing can be suppressed.

The valve device of the present invention is
It is characterized in that the valve body has a valve body inclined surface that faces the valve seat hole portion and that is tapered in a direction in which the valve body is inserted.
According to this feature, since the valve body is the valve body inclined surface that faces the valve seat hole portion and is tapered in the direction in which the valve body is inserted, the width in the pipe axial direction is formed large. Since the base end portion has high rigidity, it can withstand the moment acting by the fluid, and as a result, the long-term reliability of the valve opening/closing control can be secured.

The valve device of the present invention is
The valve seat hole portion is formed to have substantially the same diameter as the fluid pipe.
According to this feature, since the hole portion of the valve seat body is formed to have substantially the same diameter as the fluid pipe, it is possible to reduce the change in the flow-down cross section and suppress the turbulence of the flow in the housing.

The valve device of the present invention is
The valve seat body is provided with an extending portion extending toward the cut surface of the fluid pipe.
According to this feature, since the fluid is guided by the extending portion that extends toward the fluid pipe cutting surface on the inclined surface of the valve seat body, it is possible to suppress the turbulence of the flow in the housing.

It is a partial front sectional view showing a state in which a fluid pipe cutting device is installed in a housing attached to an existing fluid pipe. It is a partial cross section figure of the A arrow of FIG. It is a partial front sectional view showing a state in which the valve body is installed in the housing by the valve body inserting device. (A) is a BB arrow view of FIG. 3, and is a figure which shows the state which temporarily fixed the valve lid with the holding screw, (b) is a figure which shows the state which temporarily fixed the holding screw. FIG. 7 is a partial front cross-sectional view showing the step of installing the valve body in the housing and inserting the fixing member into the recess. (A) is a plan view showing a state in which a fixing member is inserted into a housing recess, and (b) is a partial front sectional view. It is a figure which shows the process of attaching an upper cover to a flange part. (A) is a top view which shows the state which attached the upper cover to a flange part and completed the installation body attachment process, (b) is a partial front sectional view. It is a figure which shows the dimensional relationship of the valve seat of a valve device, and the cut surface of the existing fluid pipe.

A valve device according to the present invention will be described with reference to FIGS. 1 to 9.

As shown in FIGS. 1 to 5, a valve device 1 according to the present invention includes a housing 4 that hermetically surrounds an existing fluid pipe 2, and a valve body 5 as an insertable body that can be inserted into the housing 4. , With. The valve body 5 includes a valve lid 5a that closes the housing opening 41d of the housing 4, a valve seat body 5b having a valve seat hole 5f, a valve body 5v that opens and closes the valve seat hole 5f, and an upper portion of the valve body 5v. Is provided with a valve operating shaft 5j. Further, the valve device 1 includes a packing which is housed in the packing box 5h and seals the valve operating shaft 5j, a packing (not shown) which seals between the valve body 5v and the valve seat body 5b, and the valve seat body 5b and the casing. A sealing member 5e for sealing the space with the body 4 is provided. The valve device 1 is hermetically inserted into the housing 4, and the valve operating shaft 5j is rotated to move the valve body 5v, so that the valve body 5v is provided with a valve seat hole portion provided in the valve seat body 5b. The flow of the existing fluid pipe 2 can be controlled by opening/closing 5f. However, the sealing between the valve body 5v and the valve seat body 5b is not limited to packing, and may be sealing between metals, for example.

Here, the existing fluid pipe 2 is made of, for example, ductile cast iron for waterworks buried in the ground, is formed in a substantially circular shape in cross section, and the inner peripheral surface is covered with an epoxy resin layer. The fluid pipe according to the present invention may be made of metal such as cast iron or steel, or made of asbestos, concrete, vinyl chloride, polyethylene or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe is not limited to the epoxy resin layer, and may be coated with, for example, mortar, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe by powder coating. Further, in the present embodiment, the fluid in the fluid pipe is tap water, but not limited to tap water in this embodiment, for example, industrial water, agricultural water, sewage, etc., gas or a gas-liquid mixture of gas and liquid. It doesn't matter. Further, the materials of the housing 4 and the valve body 5 may also be adapted to the above.

As shown in FIG. 1, the casing 4 attached to the outer peripheral surface of the existing fluid pipe 2 is a so-called split T-shaped pipe, and is a casing in the radial direction of the existing fluid pipe 2 (up and down direction in this embodiment). The structure is divided into an upper part 41 and a housing lower part 42. Further, the housing 4 is provided with detachment preventing metal fittings 6, 6 for preventing detachment of the existing fluid pipe 2.

A neck portion 41a, a flange portion 41b connected to the neck portion 41a, and a housing opening portion 41d connected to the flange portion 41b and communicating with the inside of the housing are formed in the housing upper portion 41, and further at the end portion of the housing opening portion 41d. Has a case recess 41c into which a fixing member 7 described later is inserted and fixed. A fluid pipe cutting device 70, a valve body inserting device 80 (see FIG. 3), etc. can be attached to the flange portion 41b via a fixed flange body 50, which will be described later, and a working valve 60.

On the other hand, the housing lower portion 42 has a bowl-shaped housing bottom portion 42d, and a discharge hole 42b is formed at the center of the housing bottom portion 42d. A valve 49 can be connected to the discharge hole 42b, and as will be described later, chips generated when the existing fluid pipe 2 is cut can be discharged together with the fluid through the discharge hole 42b by operating the valve 49. There is.

In the present embodiment, the case upper part 41 and the case lower part 42 will be referred to as the description, but the dividing direction of the case is not limited to the vertical direction, and may be, for example, the horizontal direction or the inclination direction of a predetermined angle. Further, the number of divisions may be three or more. Similarly, the piping direction of the existing fluid pipe 2 is not limited to the horizontal direction, and may be the vertical direction, for example. Further, the cutting direction of the cutter 72 described later is not limited to the vertical direction, and may be, for example, the horizontal direction. In the following embodiments, the cutter 72 will be described as an example of using a cylindrical cutter such as a hole saw with good work efficiency, but a wire saw, a cutting tool, or the like may be used.

Hereinafter, the fixed flange body 50, the work valve body 60, and the fluid pipe cutting device 70 will be described. As shown in FIG. 1, with the housing 4 hermetically attached to the existing fluid pipe 2, the fixed flange body 50, the working valve body 60, and the fluid pipe cutting device 70 are attached to the flange portion 41 b of the housing upper portion 41. Is installed.

As shown in FIGS. 1 and 2, a seal member 53 is inserted on the joint surface between the fixed flange portion 51 and the flange portion 41 b of the fixed flange body 50, and tightened by bolts and nuts 54. The fixed flange portion 51 and the flange portion 41b are sealed. In the radial direction of the fixed flange portion 51, a plurality of cap screws 52 are hermetically attached at predetermined intervals in the circumferential direction. As will be described later, when the valve body 5 is inserted into the housing 4, The valve body 5 can be temporarily fixed.

As shown in FIG. 1, a seal member 63 is inserted at a joint surface between the work valve housing 61 of the work valve body 60 and the fixed flange body 50, and the work valve body 60 and the fixed flange body are tightened by bolts 55. 50 is sealed. A work valve 62, which slides horizontally to open and close between the housing 4 and the fluid pipe cutting device 70, is hermetically attached to the work valve housing 61 of the work valve body 60.

In addition, a seal member 73 is inserted at the joint surface between the fluid pipe cutting device 70 and the working valve main body 60, and tightened by a bolt 74 so that the fluid pipe cutting device 70 and the working valve main body 60 are sealed. It Further, a cutter 72 attached to the cutter shaft 75 is attached to the punching device housing 71 in a sealed manner so as to be vertically movable and rotatable. The cutter 72 and the cutter shaft 75 can be rotationally driven from outside the fluid pipe cutting device 70 by a driving device (not shown).

Hereinafter, a cutting process of the existing fluid pipe 2 and a mounting process of the valve body 5 will be described.

First, the cutting step will be described. As shown in FIG. 1, with the work valve 62 opened, the existing fluid pipe 2 is cut by the cutter 72 in a non-disrupted state. Since the cutter 72 has a cylindrical shape, the pipe cutting portion of the existing fluid pipe 2 is formed in an arc shape along the cylindrical cutter 72 when viewed from the direction of the cutter shaft 75. The chips generated when the existing fluid pipe 2 is cut are discharged together with the fluid by operating the valve 49 attached to the discharge hole 42b provided at the center of the lower portion 42 of the housing.

After cutting the existing fluid pipe 2, the cutter 72 is raised to close the work valve 62 of the work valve housing 61 and seal the space between the housing 4 and the fluid pipe cutting device 70. Then, the fluid in the fluid pipe cutting device 70 is discharged, the fluid pipe cutting device 70 is removed from the work valve main body 60, and the cutting process work of the existing fluid pipe 2 is completed.

Next, as shown in FIG. 3, the valve body insertion device 80 is hermetically attached to the upper portion of the working valve body 60. In this valve body insertion device 80, an insertion device housing 86, an insertion shaft 87, and a holding portion 83 for holding the valve body 5 is attached to one end of the insertion shaft 87 by a mounting bolt 88, and the insertion shaft 87 At the end, a screw portion 89 screwed into the insertion shaft 87 and a handle 90 for rotating the screw portion 89 are provided, and the handle 90 is rotated to move the insertion shaft 87 up and down to move the valve body 5 Can be inserted into and removed from the housing 4.

When the handle 90 is rotated to lower the insertion shaft 87 and the valve body 5 on which the fixing members 7 and 7 are installed is inserted into and installed in the housing 4, as shown in FIG. The cap screw 52 provided on the flange main body 50 is screwed in, and the valve lid inclined surface 5c formed on the outer peripheral portion of the valve lid 5a of the valve main body 5 is temporarily fixed by the cap screw 52. After that, the fluid in the valve body insertion device 80 is discharged, the insertion device lid 84 is removed, the mounting bolt 88 that connects the holding portion 83 and the insertion shaft 87 is removed from the work hole 85, and the valve body insertion device 80 is operated. After detaching from the valve body 60, the holding portion 83 of the valve body inserting device 80 is removed from the valve body 5 (see FIG. 3).

Next, as shown in FIG. 5, when the valve body insertion device 80 is removed from the working valve body 60, the valve body insertion device 80 is fixed in a casing recess 41c formed in the casing upper portion 41, which will be described later, in a substantially rectangular shape in a plan view. Mount the members 7, 7. By mounting the fixing member 7 so as to straddle the valve lid 5a and the housing recess 41c, the fixing member 7 can hold the fluid force applied to the valve lid 5a. At this time, the work valve housing interior 61b of the work valve housing 61 has a narrow work space due to the presence of the packing box 5h and the like, and the distance from the work valve housing flange 61a of the work valve housing 61 to the fixing member is also small. Since it is far, it is difficult to insert the fixing member 7. Therefore, the work jig 92 can be inserted between the valve lid 5a and the fixing member 7 so that the fixing member 7 can be inserted into the housing recess 41c. As shown in FIGS. 5 and 6, the fixing member 7 is provided with the tapered portion 7d, so that the working jig 92 can be easily inserted even in a narrow working space. Further, the fixing member 7 is provided with a plurality of holes 7e, 7e. By inserting a working jig (not shown) into the holes 7e, 7e, not only can the fixing member 7 be inserted into the housing recess 41c even when the working space is small, but the fixing member 7 can also be removed from the housing recess 41c. It can be easily removed.

Subsequently, as shown in FIG. 6, the fixing members 7, 7 are locked by the plurality of bolts 7a, 7a. Then, the cap screw 52 is loosened (see FIG. 4B), and the fixed flange body 50 and the work valve body 60 are removed. As described above, since the fixed flange main body 50 can be removed, the structure of the installation body can be formed without leaving the fixed flange main body 50 and the plurality of holding screws 52 provided on the fixed flange main body 50 in the housing 4 and aging deterioration. Not only can it be simplified, but the fixed flange body 50 and the plurality of cap screws 52 that have been removed can be attached to another housing and reused.

Finally, as shown in FIGS. 7 and 8, the upper lid 43 is attached to the flange portion 41b by the bolts and nuts 43b, and the attaching step of the installation body is completed. Further, an upper lid convex portion 43 a that holds the fixing member 7 is provided at a position where the upper lid 43 faces the fixing member 7. Since the fixing member 7 is also held by the upper lid convex portion 43a in a state where the upper lid 43 is fastened to the flange portion 41b with the bolts and nuts 43b, the pressure applied to the fixing member 7 can be reduced. Although the upper lid 43 is formed with the upper lid convex portion 43c so as to hold not only the fixing member 7 but also the valve lid 5a, it may be omitted.

The operational effects of the valve device 1 according to the present invention will be described below. As shown in FIG. 9, the valve body 5 can be inserted into the housing 4 in a non-discontinuous flow state by cutting with a cylindrical cutter 72 in the housing 4 that hermetically surrounds the existing fluid pipe 2. It is composed.

Here, when the existing fluid pipe 2 is radially cut by the cylindrical cutter 72, as shown in FIG. 9, the distance between the fluid pipe cutting surfaces 2a, 2a in the pipe axis direction is determined by the existing fluid pipe 2 Is maximum at the top and bottom, and the minimum separation distance L1 is at a substantially intermediate position between the top and bottom of the existing fluid pipe 2. The minimum distance L1 determines the sizes of the valve seat body 5b and the valve body 5v of the valve device 1 that can be inserted into the housing 4.

For example, when the width of the valve seat body 5b in the pipe axis direction is large, the existing fluid pipe 2 is cut by the cutter 72 having a large diameter so that the valve seat body 5b can pass while ensuring the minimum separation distance L1. Need to However, in order to cut the existing fluid pipe 2 with the cutter 72 having a large diameter, it is necessary to enlarge the housing 4 that hermetically surrounds the existing fluid pipe 2. Therefore, the cost of the valve device 1 is increased, and the amount of excavation of earth and sand for burying the large valve device 1 is increased, so that the installation cost is also increased. In addition, when the housing 4 becomes large, the surface area of the valve body 5 inserted into the housing also becomes large, so that the force exerted by the fluid on the valve body 5 also becomes large and it is necessary to further reinforce the valve seat body 5b. The cost of the device 1 also increases.

On the contrary, when the housing 4 that hermetically surrounds the existing fluid pipe 2 is made small and the existing fluid pipe 2 is cut by the cylindrical cutter 72 having a small diameter, the minimum separation distance L1 also becomes small, so the valve seat body 5b, It is necessary to thin the valve body 5v. As a result, the structural strength of the valve seat body 5b and the valve body 5v is limited to a low level, and long-term reliability deteriorates.

Therefore, in the valve device 1 of the present invention, as shown in FIG. 9, the pipe axis direction width L2 of the valve seat at the position closest to the fluid pipe cutting surface 2a is smaller than the minimum separation distance L1 of the existing fluid pipe 2. By forming and miniaturizing the housing 4, the valve seat body 5b and the valve body 5v can also be miniaturized. By reducing the size of the housing 4, the cost of the valve device 1 and the installation cost of the valve device 1 can be reduced, and the surface areas of the valve seat body 5b and the valve body 5v can be reduced to reduce the valve seat body 5b and the valve body 5v. The force applied to can be reduced.

On the other hand, since the valve seat body 5b and the valve body 5v are in a cantilevered state, the structural strength of the valve seat body 5b and the valve body 5v is restricted to be low by making the housing 4 small. Therefore, in order to withstand the high stress generated in the valve seat body 5b and the valve body 5v, the valve seat body 5b faces the fluid pipe cutting surface 2a and tapers in the direction in which the valve seat body 5b is inserted. An inclined valve seat body inclined surface 5q is provided, and the pipe axis direction width L3 of the valve seat body 5b on the base end side is larger than the pipe axis direction width L2 of the valve seat body 5b at the position closest to the fluid pipe cut surface 2a. It is made large. Similarly, the valve body 5v is provided with a valve body inclined surface 5r that faces the valve seat hole portion 5f and is tapered in a direction in which the valve body 5v is inserted. The width L4 is formed to be larger than the width L2 in the pipe axis direction of the valve seat body 5b at the position closest to the fluid pipe cut surface 2a.

Further, since the valve seat body 5b can be brought closer to the fluid pipe cut surface 2a by forming the pipe axis direction width L3 on the proximal end side of the valve seat body 5b large, the valve seat body 5b can be used to disconnect the inside of the housing. Since it is possible to reduce the area change and suppress the turbulence of the flow in the housing 4, it is possible to reduce the pressure loss.

Further, as shown in FIG. 9, the valve seat body 5b is provided with a valve seat body extending portion 5p extending toward the fluid pipe cut surface 2a. The valve seat body extending portion 5p extends in the circumferential direction along the fluid pipe cutting surface 2a toward the fluid pipe cutting surface 2a, so that the flow from the existing fluid pipe 2 is applied to the valve seat body extending portion 5p. The pressure loss can be suppressed by suppressing the turbulence of the flow in the housing, and the force acting on the valve body can be reduced, and long-term reliability can be secured. Further, by forming the valve seat hole portion 5f so as to have the same cross section as the fluid pipe, it is possible to reduce the cross-sectional area change of the flow path, suppress the turbulence of the flow in the housing, and reduce the pressure loss. .. The valve seat hole portion 5f preferably has the same diameter as the inner diameter of the fluid pipe, but may be appropriately matched with the outer diameter of the fluid pipe or the like.

Although the embodiments of the present invention have been described above with reference to the drawings, the specific configurations are not limited to these embodiments, and modifications and additions within the scope not departing from the gist of the present invention are included in the present invention. Be done.

In FIG. 9, the surface of the valve seat body 5b that faces the fluid pipe cut surface 2a is formed as a valve seat body inclined surface 5q that is tapered in the direction in which the valve seat body 5b is inserted into the housing 4. .. However, the surface of the valve seat body 5b that faces the fluid pipe cut surface 2a is not limited to the inclined surface, and a portion above the position where the valve seat body 5b comes closest to the fluid pipe cut surface 2a is formed in a stepwise shape. May be. Further, the width L3 of the valve seat body 5b on the base end side in the pipe axis direction may be further increased to be larger than the minimum separation distance L1 of the existing fluid pipe 2. For example, at a position above the position where the valve seat body 5b comes closest to the fluid pipe cut surface 2a, the valve seat body 5b or the valve seat body extension portion 5p, or the pipe of the valve seat body 5b and the valve seat body extension portion 5p. The width in the axial direction is further increased to minimize the distance between the valve seat body 5b and the fluid pipe cutting surface 2a or the distance between the valve seat body extension 5p and the fluid pipe cutting surface 2a. It is possible to further suppress the turbulence of the flow and reduce the pressure loss.

1 Valve device 2 Existing fluid pipe (fluid pipe)
4 Case 5 Valve body (insert body)
5a valve lid 5b valve seat body 5f valve seat hole portion 5p valve seat body extended portion 5q valve seat body inclined surface 5r valve body inclined surface 5v valve body 72 cutter

Claims (5)

A casing having a divided structure that hermetically surrounds a water pipe, and a portion where the cut surfaces of the water pipe are formed into an arc shape by being cut by a cylindrical rotatable cutter in a constant flow state in the casing. A valve body inserted into and installed in the valve body, wherein the valve body has a valve body, a valve seat body having a valve seat hole portion, and a valve lid for closing a housing opening portion of the housing. And a sealing member for sealing between the valve seat body and the housing, the valve body being inserted toward the valve seat body installed in the housing The hole is openable and closable, and the width of the valve seat on the proximal side of the valve seat in the pipe axis direction is approximately the midpoint between the top and bottom of the water pipe that is closest to the cut surface. Is formed to be larger than the width in the axial direction of the water pipe, and is formed to be larger than the minimum distance between the cut surfaces of the water pipe, and the middle of the top and bottom of the water pipe closest to the cut surface. tube axis direction width of the valve seat body opposed to each other in position, the valve device being characterized in that it is smaller than the minimum distance between the cutting surface. The valve device according to claim 1, wherein the valve seat body has a valve seat body sloped surface that faces the cut surface and is tapered in a direction in which the valve seat body is inserted. The valve device according to claim 1 or 2, wherein the valve body has a valve body inclined surface that faces the valve seat hole portion and is inclined in a direction in which the valve body is inserted. The lower part of the case forming the case has a bowl-shaped case bottom that is sealed by the sealing member, and a discharge hole is formed in the center of the case bottom. 4. The valve device according to any one of 3 to 3. The valve device according to claim 1, wherein the valve seat body includes an extending portion that extends toward the cut surface.

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