Valve body installation method

Abstract

To provide a long-term highly reliable installation method of a valve main body, capable of cutting a fluid pipe with a cylindrical cutter in a housing surrounding the fluid pipe in a sealed state, and fitting into the housing under a non-cut flow state.SOLUTION: A valve main body 5 comprises: a valve body 5v; a valve operation shaft 5j connected to the upper part of the valve body 5v; a valve seat body 5b having a valve seat hole portion 5f opened / closed by the valve body 5v; a valve lid 5a closing a housing opening 41d of a housing 4; and a sealing member for sealing an interval between the valve seat body 5b and the housing 4. A valve body insertion device 80 includes: an insertion device housing 86; an insertion shaft 87 capable of advancing / retreating to / from the insertion device housing 86; and a holding part 83 disposed in one end of the insertion shaft 87. The valve main body 5 is inserted into the housing 4 in a state that the holding part 83 holds the valve main body 5 below the upper end of the valve operation shaft 5j, and above the valve lid 5a.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a valve device that can be installed in a housing that hermetically surrounds a fluid pipe, by cutting the fluid pipe with a cylindrical cutter, and in the housing in a state where the flow is not interrupted. [Background technology]

[0002] In a conventional valve device in which a fluid pipe is cut with a cylindrical cutter inside a housing that hermetically surrounds the fluid pipe and can be installed inside the housing in a state where flow is uninterrupted, in order to make the housing smaller and lighter, the fluid pipe is cut with a cylindrical cutter with as small a diameter as possible, and a valve body is inserted directly into the housing, and the valve body blocks the housing, thereby controlling the flow inside the fluid pipe. (See, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2006-515406 (page 6, Figures 1-5) Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, the fluid pipe is cut using a small-diameter cylindrical cutter, which reduces the distance between the cut surfaces of the fluid pipe and the closest point, making it necessary to insert the valve disc directly into the housing. However, inserting the valve disc directly into the housing increases turbulence in the fluid flowing within the housing, resulting in increased pressure loss. In addition, the pressure difference between the front and rear of the valve disc increases the force acting on the valve disc, potentially reducing long-term reliability.

[0005] The present invention has been made with an eye on these problems, and aims to provide a method for installing a valve body that has long-term reliability, in which a fluid pipe is cut with a cylindrical cutter inside a housing that hermetically surrounds the fluid pipe, and the valve body can be installed inside the housing in an uninterrupted flow state. [Means for solving the problem]

[0006] The present invention provides a valve body installation method in which a water pipe is cut by a cylindrical rotatable cutter in a state of continuous flow in a divided housing that hermetically surrounds the water pipe, and the housing is filled with clean water, and a valve body is inserted into a space between the cut surfaces of the water pipe that are formed in an arc shape in the housing using a valve body insertion device, The valve body is connected to a valve element and an upper part of the valve element, and the valve element can be turned by rotating an operating part at the upper end. Up and down A movable valve operating shaft; Opened and closed by the valve body The valve seat includes a valve seat body having a valve seat hole, a valve cover that closes the housing opening of the housing, a sealing member that seals the gap between the valve seat body and the housing, and a housing portion formed above the valve cover and inside the valve seat body. Valve box and, ,before The valve body insertion device , insert The insertion device has an insertion device housing, an insertion shaft that can advance and retreat relative to the insertion device housing, and a holding portion provided at one end of the insertion shaft, The valve body is held at a position outside the valve box that is spaced below the operating portion at the upper end of the valve operating shaft and above the upper surface of the valve cover, and the valve body with the valve cover is inserted and installed in the housing. It is characterized by the following.

[0007] The housing is provided with a detachment prevention device that prevents the water pipe from being detached. It is characterized by the following.

[0008] A discharge hole is formed at the bottom of the housing at approximately the center in the tube axis direction. It is characterized by the following.

[0009] With the holding portion holding the valve body, the outer periphery of the valve body is fixed by a fixing means provided on the housing side below the holding portion. It is characterized by the following.

[0010] A top cover is attached to the flange portion of the housing into which the valve body is inserted. It is characterized by the following. [Brief explanation of the drawings]

[0011] [Figure 1]1 is a partial front cross-sectional view showing a state in which a fluid pipe cutting device is installed in a housing attached to an existing fluid pipe. FIG. [Figure 2] FIG. 2 is a partial cross-sectional view taken along the arrow A in FIG. [Figure 3] FIG. 10 is a partial front cross-sectional view showing the state in which the valve body is installed in the housing by the valve body insertion device. [Figure 4] 4(a) is a view taken along the arrow BB in FIG. 3, showing the state in which the valve cover is temporarily fixed by the press screw, and FIG. 4(b) is a view showing the state in which the press screw has been released from temporary fixation. [Figure 5] 10 is a partial front cross-sectional view showing a process of installing the valve body in the housing and inserting the fixing member into the recess. FIG. [Figure 6] 1A is a plan view showing a state in which the fixing member is inserted into the housing recess, and FIG. 1B is a partial front cross-sectional view. [Figure 7] 10A and 10B are diagrams showing a process of attaching an upper cover to a flange portion. [Figure 8] 1A is a plan view showing the state in which the upper cover has been attached to the flange portion and the installation body attachment process has been completed, and FIG. 1B is a partial front cross-sectional view. [Figure 9] 10 is a diagram showing the dimensional relationship between the valve seat body of the valve device and a cross section of an existing fluid pipe. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] A valve device according to the present invention will be described with reference to FIGS.

[0013] As shown in FIGS. 1 to 5 , the 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 that serves as an insertable body that can be inserted into the housing 4. The valve body 5 includes a valve cover 5a that closes a housing opening 41d of the housing 4, a valve seat body 5b having a valve seat hole 5f, a valve element 5v that opens and closes the valve seat hole 5f, and a valve operating shaft 5j connected to the top of the valve element 5v. The valve device 1 further includes a packing housed in a packing box 5h that seals the valve operating shaft 5j, a packing (not shown) that seals the gap between the valve element 5v and the valve seat body 5b, and a sealing member 5e that seals the gap between the valve seat body 5b and the housing 4. The valve device 1 is hermetically inserted into the housing 4, and by rotating the valve operating shaft 5j to move the valve element 5v, the valve element 5v can open and close the valve seat hole 5f provided in the valve seat body 5b, thereby controlling the flow of the existing fluid pipe 2. However, the sealing between the valve body 5v and the valve seat body 5b is not limited to packing, and may be, for example, a metal-to-metal seal.

[0014] Here, the existing fluid pipe 2 is made of, for example, ductile cast iron for use in waterworks, buried underground, has a generally circular cross section, and its inner surface is coated with an epoxy resin layer. The fluid pipe of the present invention may also be made of other metals, such as cast iron or steel, or asbestos, concrete, polyvinyl chloride, polyethylene, or polyolefin. The inner surface of the fluid pipe is not limited to the epoxy resin layer and may be coated with, for example, mortar, or a suitable material such as powder coating. In this embodiment, the fluid in the fluid pipe is tap water. However, this is not limited to tap water; it may also be industrial water, agricultural water, sewage, or a gas or a gas-liquid mixture. The materials of the housing 4 and valve body 5 may also be compatible with the above.

[0015] 1, the housing 4 attached to the outer periphery of the existing fluid pipe 2 is a so-called split T-pipe, and is structured to be divided into an upper housing 41 and a lower housing 42 in the radial direction (vertical direction in this embodiment) of the existing fluid pipe 2. The housing 4 is also provided with separation prevention fittings 6, 6 that prevent the existing fluid pipe 2 from separating.

[0016] The housing upper part 41 is formed with a neck part 41a, a flange part 41b connected to the neck part 41a, a housing opening part 41d connected to the flange part 41b and communicating with the inside of the housing, and further formed at the end of the housing opening part 41d is a housing recess part 41c into which a fixing member 7, which will be described later, is inserted and fixed. The flange part 41b can be fitted with a fluid pipe cutting device 70, a valve body insertion device 80 (see FIG. 3), etc. via a fixing flange main body 50 and an operation valve 60, which will be described later.

[0017] Meanwhile, the lower housing part 42 has a bowl-shaped housing bottom part 42d, and a discharge hole 42b is formed in the center of the housing bottom part 42d. A valve 49 can be connected to the discharge hole 42b, and as will be described later, by operating the valve 49, chips generated when the existing fluid pipe 2 is cut can be discharged together with the fluid from the discharge hole 42b.

[0018] In this embodiment, the housing is described as having an upper housing portion 41, a lower housing portion 42, etc., but the direction in which the housing is divided is not limited to being vertical, and may be, for example, horizontal or tilted at a predetermined angle. The number of divisions may be three or more. Similarly, the piping direction of the existing fluid pipe 2 is not limited to being horizontal, and may be, for example, vertical. Furthermore, the cutting direction of the cutter 72, which will be described later, is not limited to being vertical, and may be, for example, horizontal. In the following embodiment, an example will be described in which the cutter 72 is a cylindrical cutter such as a hole saw, which has good work efficiency, but a wire saw, a cutting tool, etc. may also be used.

[0019] The following describes the fixed flange body 50, the working valve body 60, and the fluid pipe cutting device 70. As shown in Figure 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 41b of the housing upper part 41.

[0020] 1 and 2, a seal member 53 is inserted at the joint surface between the fixed flange portion 51 of the fixed flange main body 50 and the flange portion 41b, and is tightened with bolts and nuts 54 to seal the fixed flange portion 51 and the flange portion 41b. A plurality of cap screws 52 are attached in a sealed manner to the radial direction of the fixed flange portion 51 at predetermined intervals in the circumferential direction, so that the valve main body 5 can be temporarily fixed when the valve main body 5 is inserted into the housing 4, as will be described later.

[0021] 1, a seal member 63 is inserted between the joining surface of the working valve housing 61 of the working valve main body 60 and the fixed flange main body 50, and is fastened with a bolt 55, thereby sealing the working valve main body 60 and the fixed flange main body 50. A working valve 62 is attached in a sealed state to the working valve housing 61 of the working valve main body 60, and the working valve 62 slides horizontally to open and close the space between the housing 4 and the fluid pipe cutting device 70.

[0022] A seal member 73 is inserted into the joint surface between the fluid pipe cutting device 70 and the working valve body 60 and is fastened with a bolt 74, sealing the gap between the fluid pipe cutting device 70 and the working valve body 60. A cutter 72 attached to a cutter shaft 75 is attached to the drilling device housing 71 in a sealed manner so as to be movable up and down and rotatable. The cutter 72 and cutter shaft 75 can be rotated from outside the fluid pipe cutting device 70 by a drive unit (not shown).

[0023] The process of cutting the existing fluid pipe 2 and the process of attaching the valve body 5 will be described below.

[0024] First, the cutting process will be described. As shown in Figure 1, with the work valve 62 open, the existing fluid pipe 2 is cut with the cutter 72 without interrupting the flow. Because the cutter 72 is cylindrical, the cut portion of the existing fluid pipe 2 is formed in an arc shape that follows the cylindrical cutter 72 when viewed from the direction of the cutter axis 75. 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 located in the center of the lower part of the housing 42.

[0025] After the existing fluid pipe 2 is cut, the cutter 72 is raised to close the work valve 62 of the work valve housing 61, sealing the space between the housing 4 and the fluid pipe cutting device 70. Thereafter, the fluid inside the fluid pipe cutting device 70 is discharged, and the fluid pipe cutting device 70 is removed from the work valve main body 60, completing the cutting process of the existing fluid pipe 2.

[0026] 3, a valve body insertion device 80 is attached in a sealed state to the top of the working valve body 60. This valve body insertion device 80 includes an insertion device housing 86, an insertion shaft 87, one end of which has a holder 83 for holding the valve body 5 attached with a mounting bolt 88, and the other end of the insertion shaft 87 has a threaded portion 89 that is screwed into the insertion shaft 87, and a handle 90 for rotating the threaded portion 89. The handle 90 can be rotated to raise and lower the insertion shaft 87, thereby inserting and removing the valve body 5 into and from the housing 4.

[0027] The handle 90 is rotated to lower the insertion shaft 87, and the valve body 5 with the fixing members 7, 7 installed is inserted and installed into the housing 4. As shown in Figure 4(a), the cap screws 52 provided on the fixing flange body 50 are screwed in, and the valve cover inclined surface 5c formed on the outer periphery of the valve cover 5a of the valve body 5 is temporarily fixed by the cap screws 52. Thereafter, the fluid in the valve body insertion device 80 is drained, the insertion device cover 84 is removed, and the mounting bolts 88 connecting the holding part 83 and the insertion shaft 87 are removed from the working hole 85. The valve body insertion device 80 is then removed from the working valve body 60, and the holding part 83 of the valve body insertion device 80 is then removed from the valve body 5 (see Figure 3).

[0028] Next, as shown in FIG. 5, after the valve body insertion device 80 is removed from the working valve body 60, the fixing members 7, 7, which are generally rectangular in plan view, are attached to the housing recess 41c formed in the housing upper part 41 (described later). The fixing member 7 is then attached so that it straddles the valve cover 5a and the housing recess 41c, allowing the fixing member 7 to withstand the fluid force acting on the valve cover 5a. The working valve housing interior 61b of the working valve housing 61 has a limited working space due to the presence of the packing box 5h and other components. Furthermore, the distance from the working valve housing flange 61a of the working valve housing 61 to the fixing member 7 is long, making it difficult to insert the fixing member 7. Therefore, a working jig 92 is inserted between the valve cover 5a and the fixing member 7, allowing the fixing member 7 to be inserted into the housing recess 41c. As shown in FIGS. 5 and 6, the fixing member 7 has a tapered portion 7d, allowing the working jig 92 to be easily inserted even in a limited working space. Furthermore, a plurality of holes 7e, 7e are provided in the fixing member 7. 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 in a small working space, but the fixing member 7 can also be easily removed from the housing recess 41c.

[0029] Next, as shown in Figure 6, the fixing members 7, 7 are locked with a plurality of bolts 7a, 7a. Thereafter, the cap screws 52 are loosened (see Figure 4(b)), and the fixing flange body 50 and the working valve body 60 are removed. Because the fixing flange body 50 can be removed in this way, the fixing flange body 50 and the plurality of cap screws 52 provided on the fixing flange body 50 are left in the housing 4, and not only does this simplify the structure of the installed body without causing deterioration over time, but the removed fixing flange body 50 and the plurality of cap screws 52 can be attached to another housing and reused.

[0030] Finally, as shown in Figures 7 and 8, the top cover 43 is attached to the flange portion 41b with bolts and nuts 43b, completing the installation process of the installation body. In addition, a top cover protrusion 43a that holds the fixing member 7 is provided at the position of the top cover 43 facing the fixing member 7. When the top cover 43 is fastened to the flange portion 41b with the bolts and nuts 43b, the fixing member 7 is also held by the top cover protrusion 43a, so the pressure applied to the fixing member 7 can be reduced. Note that the top cover 43 is formed with a top cover protrusion 43c to hold not only the fixing member 7 but also the valve cover 5a, but this may be omitted.

[0031] The following describes the effects of the valve device 1 according to the present invention. As shown in Figure 9, the valve body 5 can be cut by a cylindrical cutter 72 inside the housing 4 that hermetically surrounds the existing fluid pipe 2, and inserted into the housing 4 without interrupting the flow.

[0032] 9, when the existing fluid pipe 2 is cut in the radial direction with the cylindrical cutter 72, the distance between the fluid pipe cut surfaces 2a, 2a in the pipe axis direction is greatest at the top and bottom of the existing fluid pipe 2, and becomes a minimum distance L1 at a position approximately midway between the top and bottom of the existing fluid pipe 2. The size of the valve seat body 5b and valve body 5v of the valve device 1 that can be inserted into the housing 4 is determined by this minimum distance L1.

[0033] For example, if the valve seat body 5b has a large axial width, it is necessary to cut the existing fluid pipe 2 with a large-diameter cutter 72 and ensure the minimum clearance distance L1 so that the valve seat body 5b can pass through. However, in order to cut the existing fluid pipe 2 with a large-diameter cutter 72, the housing 4 that hermetically encloses the existing fluid pipe 2 must be large. This increases the cost of the valve device 1, and the amount of earth excavated to bury the large valve device 1 also increases, resulting in higher installation costs. Furthermore, if the housing 4 is large, the surface area of the valve body 5 inserted into the housing also increases, which increases the force that the fluid acts on the valve body 5. This requires further reinforcement of the valve seat body 5b, further increasing the cost of the valve device 1.

[0034] Conversely, if the housing 4 that hermetically encloses the existing fluid pipe 2 is made smaller and the existing fluid pipe 2 is cut with a small-diameter cylindrical cutter 72, the minimum separation distance L1 also becomes smaller, so the valve seat body 5b and valve body 5v must be made thinner. As a result, the structural strength of the valve seat body 5b and valve body 5v is limited, and long-term reliability is reduced.

[0035] 9, the valve device 1 of the present invention is configured so that the pipe axial width L2 of the valve seat body at the position closest to the fluid pipe cross section 2a is smaller than the minimum separation distance L1 of the existing fluid pipe 2, thereby reducing the size of the housing 4 and thereby enabling the valve seat body 5b and valve body 5v to also be made smaller. 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 valve body 5v can be reduced, thereby reducing the force applied to the valve seat body 5b and valve body 5v.

[0036] On the other hand, because the valve seat body 5b and the valve body 5v are cantilevered, reducing the size of the housing 4 limits the structural strength of the valve seat body 5b and the valve body 5v. To withstand the high stress generated in the valve seat body 5b and the valve body 5v, the valve seat body 5b has an inclined surface 5q that faces the cross section 2a of the fluid pipe and tapers toward the direction in which the valve seat body 5b is inserted. The axial width L3 of the valve seat body 5b at its base end is larger than the axial width L2 of the valve seat body 5b at its closest position to the cross section 2a of the fluid pipe. Similarly, the valve body 5v has an inclined surface 5r that faces the valve seat hole 5f and tapers toward the direction in which the valve seat body 5v is inserted. The axial width L4 of the valve seat body 5v at its base end is larger than the axial width L2 of the valve seat body 5b at its closest position to the cross section 2a of the fluid pipe.

[0037] Furthermore, by increasing the pipe axial width L3 on the base end side of the valve seat body 5b, the valve seat body 5b can be brought closer to the cross-sectional surface 2a of the fluid pipe, and therefore the valve seat body 5b can reduce the change in cross-sectional area inside the housing 4 and suppress turbulence in the flow inside the housing 4, thereby reducing pressure loss.

[0038] As shown in FIG. 9 , the valve seat body 5b has a valve seat body extension 5p extending toward the fluid pipe cut surface 2a. The valve seat body extension 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 guided by the valve seat body extension 5p, suppressing flow turbulence within the housing and reducing pressure loss. This reduces the force acting on the valve body and ensures long-term reliability. Furthermore, by forming the valve seat hole 5f to have the same cross section as the fluid pipe, the change in the cross-sectional area of the flow path is minimized, suppressing flow turbulence within the housing and reducing pressure loss. While the valve seat hole 5f preferably has the same diameter as the inner diameter of the fluid pipe, it may also be adjusted to the outer diameter of the fluid pipe as appropriate.

[0039] 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 the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0040] 9, the surface of the valve seat body 5b facing the cut surface 2a of the fluid pipe is formed as a valve seat body inclined surface 5q that tapers 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 facing the cut surface 2a of the fluid pipe is not limited to an inclined surface, and the portion above the position where the valve seat body 5b is closest to the cut surface 2a of the fluid pipe may be formed to be wider in a stepped manner. Also, the width L3 of the base end side of the valve seat body 5b in the pipe axial direction may be made even larger, so that it is even larger than the minimum separation distance L1 of the existing fluid pipe 2. For example, above the position where the valve seat body 5b is closest to the cross section 2a of the fluid pipe, the width of the valve seat body 5b or the valve seat body extension 5p, or the valve seat body 5b and the valve seat body extension 5p in the pipe axial direction can be further increased to minimize the distance between the valve seat body 5b and the cross section 2a of the fluid pipe or the distance between the valve seat body extension 5p and the cross section 2a of the fluid pipe, thereby further suppressing flow disturbance within the housing 4 and reducing pressure loss. [Explanation of symbols]

[0041] 1 Valve gear 2 Existing fluid pipe (fluid pipe) 4. Cabinet 5 Valve body (insert body) 5a Valve lid 5b Valve seat body 5f Valve seat hole 5p Valve seat body extension part 5q Valve seat body inclined surface 5r Valve body inclined surface 5v valve body 72 Cutter

Claims

1. A valve body installation method in which a water pipe is cut with a cylindrical rotatable cutter in a sealed housing surrounding the water pipe, and the housing is filled with clean water in an uninterrupted flow state, and a valve body is inserted into a space between the cut surfaces of the water pipe, which are formed in an arc shape, using a valve body insertion device, and installed: the valve body comprises a valve disc, a valve operating shaft connected to the top of the valve disc and capable of moving the valve disc up and down by rotating an operating part at the top end, a valve seat body having a valve seat hole opened and closed by the valve disc, a valve lid that closes the housing opening of the housing, a sealing member that seals the gap between the valve seat body and the housing, and a valve box formed above the valve lid and having an accommodating part for the valve disc inside; the valve body insertion device comprises an insertion device housing, an insertion shaft that can advance and retreat relative to the insertion device housing, and a holding part provided at one end of the insertion shaft, and the valve body with the valve lid is inserted into the housing and installed in a state where the holding part holds the valve body at a position outside the valve box that is spaced below the operating part at the upper end of the valve operating shaft and above the upper surface of the valve lid.

2. 2. The method for installing a valve body according to claim 1, further comprising providing a device for preventing the water pipe from coming off the housing.

3. 3. The method for installing a valve body according to claim 1, wherein a discharge hole is formed in the bottom of the housing at approximately the center in the axial direction of the pipe.

4. A method for installing a valve body according to any one of claims 1 to 3, characterized in that, while the holding portion holds the valve body, the outer periphery of the valve body is fixed by a fixing means provided on the housing side below the holding portion.

5. 5. The method for installing a valve body according to claim 1, further comprising the step of attaching an upper cover to a flange portion of the housing into which the valve body is inserted.

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