JP2019070445A - Valve device - Google Patents

Abstract

To provide a valve device which is capable of reducing a pressure loss and improves long-term reliability even in a case where a separation distance of a cross section of a fluid pipe is small in the valve device in which the fluid pipe is cut by a cylindrical cutter inside of a housing that encloses the fluid pipe in a sealed state and which can be attached into the housing in a non-cutoff flow state.SOLUTION: A valve main body comprises a valve body 5v, a valve seat body 5b including a valve seat hole part 5f, a valve lid 5a closing a housing opening 41d of a housing 4, and a sealing member which seals a clearance between the valve seat body 5b and the housing 4. The valve body 5v is inserted towards the valve seat body 5b which is installed inside of the housing 4, thereby opening/closing the valve seat hole part 5f. A width L3 in a pipe axial direction at a proximal end side of the valve seat body 5b is formed larger than a width L2 of the valve seat body 5b in the pipe axial direction at a substantially intermediate position between the top and the bottom of a water supply pipe 2 that is closest to a cross section 2a. The width L2 of the valve seat body 5b in the pipe axial direction which is opposite at the substantially intermediate position between the top and the bottom of the water supply pipe 2 that is closest to the cross section 2a is formed smaller than a minimum separation distance L1 mutually between the cross sections 2a and 2a.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a valve device which can cut a fluid pipe with a cylindrical cutter in a housing which encloses the fluid pipe in a sealing manner, and can be mounted in the housing without interruption.

In order to reduce the size and weight of a casing in a valve device which can cut a fluid pipe with a cylindrical cutter in a casing that hermetically encloses a conventional fluid pipe and attach it in the casing in a discontinuous flow state, The fluid pipe was cut with a cylindrical cutter as small as possible, and the valve body was directly inserted into the housing, and the flow in the fluid pipe was controlled by blocking the housing with the valve body.
(See, for example, Patent Document 1).

Japanese Patent Application Publication No. 2006-515406 (page 6, FIGS. 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 is closest is reduced, and the valve body is directly attached to the housing. I had no choice but to insert it. However, if the valve body is inserted directly into the housing, the turbulence of the fluid flowing in the housing will be increased, and the pressure loss will increase, and the pressure difference across the valve body will also increase the force acting on the valve body. Reliability could be reduced.

  The present invention has been made in view of such problems, and the fluid pipe is cut with a cylindrical cutter in a housing which encloses the fluid pipe in a sealing manner, and the fluid pipe is cut in a discontinuous flow state in the housing. It is an object of the present invention to provide a long-term reliable valve device capable of reducing pressure loss even in the case of a mountable valve device, even when the separation distance of the cut surfaces of the fluid pipe is small.

In order to solve the above-mentioned subject, the valve device of the present invention,
A valve device comprising: a housing sealingly enclosing a fluid pipe; and an insert which is cut by the cylindrical cutter in the housing and which can be inserted into the housing without interruption. The insert body includes a valve body and a valve seat body having a valve seat hole portion, and the valve body can control the fluid by opening and closing the valve seat hole portion. It is characterized in that the tube axial direction width on the proximal end side is formed larger than the tube axial direction width of the valve seat body at the position closest to the fluid tube cut surface.
According to this feature, the insert body including the valve body and the valve seat body which can be inserted into the closest portion of the fluid pipe cut surface cut by the cylindrical cutter is the proximal end side of the valve seat body The width in the axial direction of the tube is formed large, and the separation width between the portion and the fluid tube cut surface can be minimized, so that the disturbance of the flow in the housing can be suppressed and the pressure loss can be reduced. The acting force can be reduced to ensure long-term reliability.

The valve device of the present invention is
The valve seat body is characterized by having a valve seat body inclined surface which is opposed to the fluid pipe cut surface and which is tapered in a direction in which the valve seat body is inserted.
According to this feature, the surface facing the fluid pipe cutting surface has a valve seat inclined surface that tapers in the direction in which the valve seat is inserted. The valve device provided can be inserted into the housing, and the gap between the valve seat body and the fluid pipe cut surface can be reduced by the base end of the valve seat body having a large axial axial width formed by the valve seat inclined surface. Since it can, it can control the disorder of the flow in a case.

The valve device of the present invention is
The said valve body is characterized by having a valve body inclined surface which faces the said valve seat hole part, and tapers in the direction in which this valve body is inserted.
According to this feature, since the valve body is the valve body inclined surface which faces the valve seat hole and tapers in the direction in which the valve body is inserted, the width in the tube axial direction is formed large. Since the proximal end has high rigidity, it can withstand the moment exerted by the fluid, which can ensure the long-term reliability of the valve body opening / closing control.

The valve device of the present invention is
The valve seat hole is formed to have substantially the same diameter as the fluid pipe.
According to this feature, since the hole 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 flow disturbance in the housing.

The valve device of the present invention is
The valve seat body is characterized by including an extending portion extending toward the fluid pipe cutting surface.
According to this feature, since the fluid is guided by the extending portion extended toward the fluid pipe cutting surface on the inclined surface of the valve seat body, it is possible to suppress the disturbance of the flow in the housing.

It is a partial front sectional view which shows the state which installed the fluid pipe cutting device in the housing attached to the existing fluid pipe. It is a partial cross section figure of A arrow of FIG. It is a partial front sectional view which shows the state which installed the valve main body in the housing | casing by the valve main body insertion apparatus. (A) is a BB arrow view of FIG. 3, and shows a state in which the valve cover is temporarily fixed by the presser screw, and (b) shows a state in which the temporary lock of the presser screw is released. It is a partial front sectional view which shows the process of installing a valve main body in a housing | casing, and inserting a fixing member in a recessed part. (A) is a top view which shows the state which inserted the fixing member in the housing | casing recessed part, (b) is partial front sectional drawing. 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 the flange part and completed the installation body attachment process, (b) is partial front sectional drawing. It is a figure which shows the dimensional relationship of the valve-seat body of a valve apparatus, and the cut surface of an existing fluid pipe.

  The valve arrangement according to the invention will be described with reference to FIGS. 1 to 9.

  As shown in FIGS. 1 to 5, the valve device 1 according to the present invention includes a housing 4 that encloses the existing fluid pipe 2 in a sealing manner, a valve main body 5 as an insert that can be inserted into the housing 4. And. The valve main body 5 includes a valve cover 5a for closing the case opening 41d of the housing 4, a valve seat 5b having a valve seat hole 5f, a valve body 5v for opening and closing the valve seat hole 5f, and an upper portion of the valve body 5v. And a valve operating shaft 5j connected thereto. Furthermore, the valve device 1 includes a packing housed in the packing box 5h for sealing the valve operation shaft 5j, a packing (not shown) for sealing between the valve body 5v and the valve seat body 5b, and the valve seat body 5b and the housing A sealing member 5e is provided to seal between the body 4 and the body. Then, the valve device 1 is sealingly inserted into the housing 4, and the valve operation shaft 5j is rotated to move the valve body 5v, whereby the valve body 5v is provided in the valve seat body 5b. The flow of the existing fluid pipe 2 can be controlled by opening and closing 5f. However, the seal between the valve body 5v and the valve seat body 5b is not limited to the packing, and may be, for example, a seal between metals.

  Here, the existing fluid pipe 2 is made of, for example, ductile cast iron for water supply 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, asbestos, concrete, vinyl chloride, polyethylene or polyolefin. Furthermore, the inner peripheral surface of the fluid pipe may be coated with, for example, a mortar or the like without being limited to the epoxy resin layer, or an appropriate material may be coated on the inner peripheral surface of the fluid pipe by powder coating. Further, although the fluid in the fluid pipe in the present embodiment is fresh water, the fluid is not limited to the above embodiment, and, for example, a gas-liquid mixture of gas or gas in addition to industrial water, agricultural water, sewage etc. It does not matter. Also, the materials of the housing 4 and the valve main body 5 may be compatible with the above.

  As shown in FIG. 1, the housing 4 attached to the outer peripheral surface of the existing fluid pipe 2 is a so-called split T-shaped pipe, and the housing is in the radial direction of the existing fluid pipe 2 (vertical direction in this embodiment) The structure is divided into an upper portion 41 and a lower portion 42 of the case. 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, a housing opening 41d connected to the flange portion 41b and communicating with the inside of the housing are formed in the housing upper part 41, and further, an end of the housing opening 41d is formed. A housing recess 41c is formed to insert and fix a fixing member 7 described later. A fluid pipe cutting device 70, a valve body insertion device 80 (see FIG. 3) and the like can be attached to the flange portion 41b via a fixed flange main body 50 and a work valve 60 described later.

  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. The discharge hole 42b can be connected to the valve 49, and as described later, chips generated at the time of cutting the existing fluid pipe 2 can be discharged together with the fluid from the discharge hole 42b by operating the valve 49. There is.

  In the present embodiment, the casing upper portion 41, the casing lower portion 42, and the like are referred to, but the division direction of the casing is not limited to the upper and lower directions, and may be, for example, a horizontal direction or an inclined direction at a predetermined angle. Also, the number of divisions may be three or more. Similarly, the piping direction of the existing fluid pipe 2 is not limited to horizontal, and may be vertical, for example. Furthermore, the cutting direction of the cutter 72 described later is not limited to the vertical direction, and may be, for example, a horizontal direction. In the following embodiment, although the cutter 72 demonstrates the example which uses cylindrical cutters, such as a hole saw with sufficient working efficiency, a wire saw, a cutting tool, etc. may be used.

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

  As shown in FIG. 1 and FIG. 2, the seal member 53 is inserted in the joint surface of the fixed flange portion 51 of the fixed flange main body 50 and the flange portion 41 b and tightened by the bolt and nut 54 The fixed flange portion 51 and the flange portion 41 b are sealed. In the radial direction of the fixed flange portion 51, a plurality of presser screws 52 are sealingly attached at predetermined intervals in the circumferential direction, and when the valve main body 5 is inserted into the housing 4 as described later. The valve body 5 can be temporarily fixed.

  As shown in FIG. 1, a seal member 63 is inserted between the work valve body 61 of the work valve body 60 and the fixing flange body 50, and the work valve body 60 and the fixing flange body are tightened by bolts 55. It is sealed with 50. A work valve 62, which can be opened and closed between the housing 4 and the fluid pipe cutting device 70 by sliding movement in a horizontal direction, is sealingly attached to the work valve casing 61 of the work valve main body 60.

  Further, the joint surface between the fluid pipe cutting device 70 and the working valve body 60 is inserted with the sealing member 73, tightened by a bolt 74, and sealed between the fluid pipe cutting device 70 and the working valve body 60. Ru. Furthermore, a cutter 72 attached to the cutter shaft 75 is sealingly, vertically and movably and rotatably attached to the punching device housing 71. The cutter 72 and the cutter shaft 75 can be rotationally driven from the outside of the fluid pipe cutting device 70 by a drive device (not shown).

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

  First, the cutting process will be described. As shown in FIG. 1, with the work valve 62 open, the existing fluid pipe 2 is disconnected by the cutter 72 in a non-continuous flow 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 cutting the existing fluid pipe 2 operate the valve 49 attached to the discharge hole 42b provided at the center of the lower part 42 of the housing to discharge the chips together with the fluid.

  After cutting the existing fluid pipe 2, the cutter 72 is raised, the work valve 62 of the work valve housing 61 is closed, and the space between the housing 4 and the fluid pipe cutting device 70 is sealed. Thereafter, 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 finished.

  Next, as shown in FIG. 3, the valve body insertion device 80 is sealingly attached to the upper portion of the working valve body 60. The valve main body insertion device 80 has an insertion device housing 86, an insertion shaft 87, and a holding portion 83 for holding the valve main body 5 attached to one end of the insertion shaft 87 by a mounting bolt 88. At the end, there are provided a screw portion 89 screwed into the insertion shaft 87, and a handle 90 for turning the screw portion 89. The handle 90 is turned to raise and lower the insertion shaft 87. Can be inserted into and removed from the housing 4.

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

  Next, as shown in FIG. 5, when the valve main body insertion device 80 is removed from the working valve main body 60, fixing in a generally rectangular shape in plan view is made in a housing recess 41c formed in a housing upper portion 41 described later. Attach the members 7, 7. Then, by mounting the fixing member 7 so as to straddle the valve cover 5a and the housing recess 41c, the fixing member 7 can hold the fluid force applied to the valve cover 5a. At this time, the work valve case interior 61b of the work valve case 61 has a narrow work space due to the presence of the packing box 5h etc. Furthermore, the distance from the work valve case flange 61a of the work valve case 61 to the fixing member is also Since it is far, insertion of the fixing member 7 is difficult. Therefore, the fixing member 7 can be inserted into the housing recess 41 c by inserting the working jig 92 between the valve cover 5 a and the fixing member 7. As shown in FIGS. 5 and 6, the fixing member 7 is provided with a tapered portion 7d, and 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, even if the working space is narrow, not only can the fixing member 7 be inserted into the housing recess 41c, but also the fixing member 7 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. Thereafter, the setscrew 52 is loosened (see FIG. 4 (b)), and the fixing flange main body 50 and the working valve main body 60 are removed. As described above, since the fixing flange main body 50 can be removed, the fixing flange main body 50 and the plurality of holding screws 52 provided on the fixing flange main body 50 are left in the housing 4 and the structure of the installation body is not deteriorated with age. Besides being simple, it is possible to attach the removed fixed flange body 50 and the plurality of set screws 52 to another case and reuse them.

  Finally, as shown in FIGS. 7 and 8, the upper lid 43 is attached to the flange portion 41b by the bolt and nut 43b, and the attaching process of the installation body is completed. Further, at a position where the upper lid 43 faces the fixing member 7, an upper lid convex portion 43a for holding the fixing member 7 is provided. Since the fixing member 7 is also held by the upper lid convex portion 43a in a state where the upper lid 43 is tightened to the flange portion 41b by the bolt and nut 43b, the pressure received by the fixing member 7 can be reduced. In addition, although the upper cover convex part 43c is formed in the upper cover 43 so that not only the fixing member 7 but the valve cover 5a may be hold | maintained, you may abbreviate | omit.

  Hereinafter, the effect of the valve apparatus 1 which concerns on this invention is demonstrated. As shown in FIG. 9, the valve main body 5 can be cut by the cylindrical cutter 72 in the housing 4 that encloses the existing fluid pipe 2 in a sealing manner, and can be inserted into the housing 4 without interruption. It is a structure.

  Here, when the existing fluid pipe 2 is radially cut by the cylindrical cutter 72, as shown in FIG. 9, the separation distance between the fluid pipe cut surfaces 2a and 2a in the tube axial direction is the existing fluid pipe 2 The maximum distance between the top and bottom of the fluid tube 2 is obtained, and the minimum separation distance L1 is obtained approximately at the middle between the top and bottom of the existing fluid pipe 2. The sizes of the valve seat body 5b and the valve body 5v of the valve device 1 which can be inserted into the housing 4 are determined by the minimum separation distance L1.

  For example, when the width in the axial direction of the valve seat body 5b is large, the existing fluid pipe 2 is cut by the cutter 72 having a large diameter to secure the minimum separation distance L1 so that the valve seat body 5b can pass through You 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 which encloses the existing fluid pipe 2 in a sealing manner. As a result, the cost of the valve device 1 increases, and the amount of earth and sand excavated for burying the large valve device 1 also increases, so the installation cost also increases. Further, if the housing 4 becomes large, the surface area of the valve main body 5 inserted into the housing also becomes large, so the force of the fluid acting on the valve main body 5 also becomes large, and it is necessary to further reinforce the valve seat 5b. The cost of the device 1 also increases.

  On the contrary, when the existing fluid pipe 2 is cut with a small diameter cylindrical cutter 72 by reducing the housing 4 which encloses the existing fluid pipe 2 in a sealing manner, the minimum separation distance L1 is also reduced, so the valve seat 5b, It is necessary to make the valve body 5v thinner. As a result, the structural strength of the valve seat body 5b and the valve body 5v is limited to a low level, and the long-term reliability is reduced.

  Therefore, as shown in FIG. 9, in the valve device 1 of the present invention, the axial width L2 of the valve seat at the position closest to the fluid pipe cut surface 2a is smaller than the minimum separation distance L1 of the existing fluid pipes 2 By forming the housing 4 and miniaturizing the housing 4, the valve seat 5b and the valve 5v can also be miniaturized. By making the housing 4 smaller, the cost of the valve device 1 and the installation cost of the valve device 1 can be reduced, and the surface area of the valve seat body 5b and the valve body 5v can be reduced to make the valve seat body 5b and the valve body 5v. Can be reduced.

  On the other hand, since the valve seat body 5b and the valve body 5v are in a cantilever state, the structural strength of the valve seat body 5b and the valve body 5v is limited to a low level 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 cut surface 2a and tapers in the direction in which the valve seat body 5b is inserted. An inclined valve seat inclined surface 5q is provided, and a tube axial width L3 on the base end side of the valve seat 5b is greater than a tube axial width L2 of the valve seat 5b at a position closest to the fluid pipe cut surface 2a. It is enlarged and formed. Similarly, the valve body 5v is provided with a valve body inclined surface 5r which is opposed to the valve seat hole portion 5f and is tapered in the direction in which the valve body 5v is inserted, and the tube axial direction of the proximal end side of the valve body 5v The width L4 is formed larger than the width L2 in the axial direction of the valve seat 5b at the position closest to the fluid pipe cut surface 2a.

  Further, the valve seat body 5b can be brought close to the fluid pipe cut surface 2a by forming the tube axial direction width L3 on the base end side of the valve seat body 5b large, so that the inside of the casing is cut off by the valve seat body 5b. Since the change in area can be reduced and the disturbance of the flow in the housing 4 can be suppressed, the pressure loss can be reduced.

  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. Since the valve seat body extending portion 5p extends circumferentially along the fluid pipe cut surface 2a toward the fluid pipe cut surface 2a, the flow from the existing fluid pipe 2 is the valve seat body extending portion 5p. Thus, it is possible to reduce the pressure loss by suppressing the disturbance of the flow in the housing, and hence the force acting on the valve body can be reduced, and the long-term reliability can be ensured. 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 change in cross sectional area of the flow path, to suppress the disturbance of the flow in the housing and to reduce the pressure loss. . The valve seat hole 5f preferably has the same diameter as the inner diameter of the fluid pipe, but may be appropriately matched to 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 configuration is not limited to these embodiments, and any changes or additions may be made without departing from the scope of the present invention. Be

  In FIG. 9, the surface on which the valve seat body 5b is opposed to the fluid pipe cut surface 2a is formed as a valve seat sloped surface 5q which is tapered in the direction in which the valve seat body 5b is inserted into the housing 4. . However, the surface on which the valve seat body 5b is opposed to the fluid pipe cut surface 2a is not limited to the inclined surface, and the portion above the position where the valve seat body 5b approaches the fluid pipe cut surface 2a most widely is formed stepwise. May be In addition, the tube axial direction width L3 on the base end side of the valve seat body 5b can be further increased to be larger than the minimum separation distance L1 of the existing fluid pipe 2. For example, 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 above the position where the valve seat body 5b most approaches the fluid pipe cut surface 2a. The axial width is further increased to minimize the separation distance between the valve seat 5b and the fluid pipe cut surface 2a or the separation distance between the valve seat extension 5p and the fluid pipe cut surface 2a. It is possible to further suppress flow disturbance and reduce pressure loss.

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

Claims (5)

  A divided structure surrounding a water pipe in a sealed manner, and a separated portion of the cut surfaces of the water pipe which is cut by a cylindrical rotatable cutter in an intermittent flow state and formed in an arc shape in the housing. Valve body inserted and installed in the valve body, the valve body comprising a valve body, a valve seat body having a valve seat hole portion, and a valve lid for closing the case opening 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 opening in the hole can be opened and closed, and the axial direction width of the proximal end side of the valve seat body is the valve seat at a substantially intermediate position between the top and the bottom of the water pipe closest to the cut surface. Is formed larger than the axial direction width of the pipe, and is opposed at a substantially intermediate position between the top and the bottom of the water pipe closest to the cut surface. That the tube axis direction width of the valve seat body, 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 inclined surface which is inclined in a direction in which the valve seat body is opposed to the cutting surface and inserted.   The valve device according to claim 1 or 2, wherein the valve body has a valve body inclined surface which faces the valve seat hole and tapers in a direction in which the valve body is inserted.   The lower part of the case constituting the case has a bowl-like case bottom sealed by the sealing member, and a discharge hole is formed at the center of the case bottom. The valve device according to any one of to 3.   The valve device according to any one of claims 1 to 4, wherein the valve seat body includes an extending portion extending toward the cutting surface.

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