Valve device, valve device constructing method, and valve device assembling method

Abstract

To provide a valve device capable of properly deforming a seal member, a valve device construction method, and a valve device assembling method.SOLUTION: A valve body 3 of a valve device 1 has: a first seal member 5 having a first seal part 50 for sealing an edge of a through hole K1 and a second seal part 51 deformable in a diameter-enlarging direction D3; a support member 6 supporting the first seal member 5; and a moving member 8 relatively movable to the support member 6 in an insertion direction D2 of the valve body 3. The moving member 8 relatively moves to the support member 6 in the insertion direction D2 of the valve body 3, so that the moving member 8 can pressurize the second seal part 51 to deform the second seal part 51 in a diameter enlarging direction D3. A communication passage 53 communicated with upstream and downstream sides of the valve body 3 is formed on the first seal member 5 in the insertion direction D2 of the valve body 3. The communication passage 53 is blocked by the moving member 8 relatively moving to the support member 6 in the insertion direction D2 of the valve body 3.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a valve device used in a fluid pipe such as a water pipe, a method for installing the valve device, and a method for assembling the valve device. [Background technology]

[0002] As an example of a valve device used in a fluid pipe such as an existing water pipe, a valve device is disclosed that opens and closes the fluid pipe by inserting or withdrawing a valve body into or from a through hole formed in the fluid pipe. The valve body has a support member that is movable along the insertion direction (downward) of the valve body, and a seal member supported by the support member. The seal member has an annular first seal portion for sealing the through hole, and a U-shaped second seal portion that is deformable radially outward of the fluid pipe and for sealing the inner wall of the fluid pipe.

[0003] The closing action of the valve disc is described as follows: The support member moves downward and the seal member is pressed against the lower inner wall of the fluid pipe. When the support member is forcibly lowered further, the U-shaped second seal portion is compressed vertically, so that both the left and right side portions of the second seal portion are forcibly expanded laterally (in the radial direction of the fluid pipe) to expand in diameter, and the second seal portion seals the inner wall of the fluid pipe. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 6-159526 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, in order for the second seal portion to adequately seal the inner wall of the fluid pipe, it is necessary to appropriately deform the second seal portion outward in the pipe diameter direction of the fluid pipe. In order to utilize the force that advances in the insertion direction of the valve body, it may be difficult to deform the second seal portion outward in the pipe diameter direction of the fluid pipe. In addition, the force required to deform the second seal portion for sealing may be affected by water pressure, making it difficult to deform the second seal portion outward in the pipe diameter direction of the fluid pipe.

[0006] The present disclosure provides a valve device, a method for installing the valve device, and a method for assembling the valve device, which are capable of appropriately deforming a seal member. [Means for solving the problem]

[0007] The valve device of the present disclosure comprises a valve body insertable into a fluid pipe through a through hole formed in the fluid pipe, the valve body having a first seal member having a first seal portion for sealing an edge of the through hole and a second seal portion which is deformable in a radial expansion direction perpendicular to the insertion direction of the valve body and expands radially outward of the fluid pipe to seal an inner wall of the fluid pipe, a support member which supports the first seal member, and a movable member which is movable relative to the support member in the insertion direction of the valve body, the movable member moving relative to the support member in the insertion direction of the valve body allows the movable member to press the second seal portion to deform the second seal portion in the radial expansion direction, and a communication passage communicating with upstream and downstream of the valve body is formed in the insertion direction of the valve body in the first seal member, and the communication passage is blocked by the movable member which moves relative to the support member in the insertion direction of the valve body. [Brief description of the drawings]

[0008] [Figure 1] 1 is a partially cutaway cross-sectional view showing a valve device 1 provided in a fluid pipe K of a first embodiment, as viewed in a direction parallel to a pipe axis direction D1. [Diagram 2] 1 is a partially cutaway cross-sectional side view showing a valve device 1 provided in a fluid pipe K of a first embodiment. [Diagram 3]1 is a partially cutaway cross-sectional view showing a valve device 1 provided in a fluid pipe K of a first embodiment, taken along a line parallel to the pipe axis direction and passing through the center of a valve body. [Figure 4] 2 is a perspective view showing a state in which a first seal member 5, a support member 6, a second seal member 7, a moving member 8 and a fixed member 9 which constitute a valve body 3 are assembled. FIG. [Diagram 5] 1 is a plan view seen from a line of sight parallel to the insertion direction of the valve body, showing how a first seal member 5, a support member 6, a second seal member 7, a moving member 8 and a fixed member 9 that constitute the valve body 3 are assembled. FIG. [Figure 6] 1 is a front view seen from a line of sight parallel to the axial direction of the fluid pipe, showing how the first seal member 5, support member 6, second seal member 7, movable member 8 and fixed member 9 that constitute the valve body 3 are assembled. [Figure 7] 1 is a side view showing a state in which a first seal member 5, a support member 6, a second seal member 7, a moving member 8 and a fixed member 9 that constitute a valve body 3 are assembled. FIG. [Figure 8] 1 is a bottom view showing how a first seal member 5, a support member 6, a second seal member 7, a moving member 8 and a fixed member 9 that constitute a valve body 3 are assembled. FIG. [Figure 9] 4 is a cross-sectional view corresponding to FIG. 3, illustrating a process of inserting the valve body 3. FIG. [Figure 10] 4 is a cross-sectional view corresponding to FIG. 3, illustrating a process of inserting the valve body 3. FIG. [Figure 11] 4 is a cross-sectional view corresponding to FIG. 3, illustrating a process of inserting the valve body 3. FIG. [Figure 12] FIG. 11 is a cross-sectional view corresponding to FIG. 10 in the second embodiment. [Figure 13] 10 is a cross-sectional view showing a modified valve body 3, taken along the insertion direction of the valve body 3 and the pipe axis direction D1 of the fluid pipe K. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [First embodiment] Hereinafter, the valve device 1 used in the fluid pipe K of the first embodiment of the present disclosure, a method for installing the valve device 1, and a method for assembling the valve device 1 will be described.

[0010] 1 and 2, the valve device 1 has a valve box 2 that can be attached to a fluid pipe K of an existing pipe (water pipe), a valve disc 3 housed in the valve box 2, and a valve box packing 4 that seals a gap between the inner surface of the valve box 2 and the outer circumferential surface of the fluid pipe K. A through hole K1 is formed in the fluid pipe K by a drilling device in an uninterrupted flow state, and the valve disc 3 is inserted into the fluid pipe K through the through hole K1, thereby installing the valve device 1 in the fluid pipe K. The through hole K1 is smaller than the inner diameter of the fluid pipe K.

[0011] The valve box 2 is made of a metal material and is a split T-shaped pipe fitted onto the fluid pipe K, watertightly surrounding the outer circumferential surface of a predetermined portion of the fluid pipe K. The valve box 2 has a two-part structure, an upper part and an lower part, and is composed of an upper member 2A and a lower member 2B. The upper member 2A and the lower member 2B are joined by a fastener S1 at the ends in the circumferential direction of the fluid pipe K. In the first embodiment, the fastener S1 is made of a bolt and a nut, but it is also possible to join them by welding instead.

[0012] The valve box gasket 4 is formed from an elastic material such as rubber, and is arranged in an annular shape between the upper member 2A and the outer peripheral surface of the fluid pipe K, in a position surrounding the through hole K1 formed in the fluid pipe K.

[0013] The valve disc 3 is configured to be able to rise and fall in response to the operation of the valve stem 30, and blocks the flow path of water flowing through the fluid pipe K. Figure 3 shows the valve disc 3 in a raised, open position, and the flow path is blocked when the valve disc 3 moves down to the closed position. The upper part of the valve box 2 is closed by a valve lid 21, which supports the valve stem 30.

[0014] 1 to 8, the valve body 3 has a first seal member 5, a support member 6, a second seal member 7, a moving member 8, and a fixed member 9. The first seal member 5 and the second seal member 7 are made of an elastic material such as rubber. The support member 6, the moving member 8, and the fixed member 9 are made of a metal material.

[0015] The support member 6 supports the first seal member 5. The moving member 8 is inserted into the support member 6 and is a member that can move relative to the support member 6 in the insertion direction D2 of the valve body 3. In the first embodiment, the moving member 8 has a rod-shaped portion 80 and a pair of protruding pieces 81 that protrude radially outward from the rod-shaped portion 80. The pair of protruding pieces 81 are provided to press the second seal portion 51 described later from the inside. The valve shaft 30 is connected to the base end (upper end; end in the opposite direction to the insertion direction D2 of the valve body 3) of the rod-shaped portion 80, and the screw top is screwed together by the rotation of the threaded valve shaft 30, allowing the moving member 8 to move up and down. The second seal member 7 is provided at the tip (lower end; end in the insertion direction D2 of the valve body 3) of the rod-shaped portion 80. The second seal member 7 is a seal member provided separately from the first seal member 5, and is formed in a circular shape when viewed from a line of sight parallel to the insertion direction D2 of the valve body 3.

[0016] The fixing member 9 is a member that prevents the moving member 8 from coming off the supporting member 6. It closes a part of a housing chamber 63 (described later) of the supporting member 6 into which the moving member 8 is inserted (see FIG. 4). In the first embodiment, the fixing member 9 is fixed to the supporting member 6 by a fastener S2 such as a bolt, but the method of fixing the fixing member 9 to the supporting member 6 can be changed as appropriate.

[0017] The first seal member 5 has a first seal portion 50 for sealing the edge of the through hole K1. The first seal portion 50 has an annular portion along the edge of the through hole K1. The annular portion as the first seal portion 50 is formed larger than the through hole K1. By forcibly inserting the annular portion as the first seal portion 50 into the through hole K1, the first seal portion 50 deforms and comes into close contact with the edge of the through hole K1.

[0018] The first seal member 5 has a second seal portion 51 that is deformable in a radial expansion direction D3 to seal the inner wall of the fluid pipe K in the radial expansion direction D3. The radial expansion direction D3 is a direction perpendicular to the insertion direction D2 of the valve body 3 and expands outward in the pipe diameter direction of the fluid pipe K. The second seal portion 51 expands (deforms) in the radial expansion direction D3 by being pressed by the moving member 8, and becomes larger than the inner diameter of the through hole K1, thereby closely contacting the inner wall of the fluid pipe K in the radial expansion direction D3. In the first embodiment, the first seal member 5 has a U-shaped portion connected to the annular portion. Specifically, the first seal member 5 has a pair of extension portions that each extend downward (in the insertion direction D2 of the valve body 3) from the annular portion, and the lower ends of the pair of extension portions are connected to form the U-shaped portion. In the first embodiment, the second seal portion 51 is provided in a side portion of the U-shaped portion.

[0019] The first seal member 5 has a third seal portion 52 for sealing the inner wall of the fluid pipe K in the insertion direction D2 of the valve body 3. The third seal portion 52 is provided at the bottom (the end portion in the insertion direction D2 of the valve body 3) of the U-shaped portion of the first seal member 5. The third seal portion 52 is pressed in the insertion direction D2 of the valve body 3 by a pressing portion 64 (described later) of the support member 6, thereby coming into close contact with the inner wall of the fluid pipe K in the insertion direction D2 of the valve body 3.

[0020] Among the first seal member 5, the first seal portion 50 is the softest. This is because the first seal portion 50 needs to be pressed into the through hole K1 to be in close contact with the edge of the through hole K1, and therefore the first seal portion 50 needs to be relatively soft (has low rubber hardness). In contrast, the second seal portion 51 needs to be deformed in the radial expansion direction D3 by being pressed by the moving member 8 to be in close contact with the inner wall of the fluid pipe K, and if the rubber is too soft, it may lose to the water pressure and escape, and may not be in close contact with the inner wall of the fluid pipe K. Therefore, at least a part of the second seal portion 51 is harder than the first seal portion 50. In the first embodiment, the first seal member 5 is rubber, and the upper part of the first seal member 5 is made of soft rubber, and the lower part is made of hard rubber. The interface between the upper rubber and the lower rubber passes through the second seal portion 51, but this can be changed as appropriate.

[0021] The support member 6 has an annular first groove 60 that accommodates part of the annular portion of the first seal member 5, and a second groove 61 that accommodates part of the U-shaped portion of the first seal member 5. The first groove 60 is formed on the outer periphery of the support member 6 so as to be annular about the valve body axis parallel to the insertion direction D2 of the valve body 3. The second groove 61 is formed on a pair of side portions and the bottom of the support member 6.

[0022] The support member 6 has an accommodation chamber 63 therein for accommodating a moving member 8, which will be described later. The accommodation chamber 63 has a dimension that allows the moving member 8 to move in the insertion direction D2 of the valve body 3. The accommodation chamber 63 has a pair of first openings 63a that open in the radial expansion direction D3 and a second opening 63b that opens downward (the insertion direction D2 of the valve body 3). The pair of first openings 63a and second openings 63b each communicate with the second groove 61. As shown in FIGS. 3, 9 to 11, when the U-shaped portion of the first seal member 5 is accommodated in the second groove 61, the inner portion 51a of the second seal portion 51 extends from the radially outer side of the valve body 3 toward the inner side to the accommodation chamber 63. When viewed from a line of sight parallel to the insertion direction D2 of the valve body 3, the inner portion 51a of the second seal portion 51 is disposed at a position overlapping the moving member 8 in a natural state in which no external force is acting. The inner portion 51a of the second seal portion 51 is inclined from the outer side to the inner side in the radial direction of the valve body 3 as it moves toward the insertion direction D2 of the valve body 3 (from top to bottom). As a result, when the moving member 8 moves in the insertion direction D2 of the valve body 3 without moving the support member 6, the pair of protruding pieces 81 of the moving member 8 come into contact with the inner portion 51a of the second seal portion 51, and the moving member 8 presses the second seal portion 51 in the radial expansion direction D3. As a result, the second seal portion 51 is deformed in the radial expansion direction D3.

[0023] The support member 6 has a pressing portion 64 that presses the third seal portion 52 in the insertion direction D2 (downward) of the valve body 3. A first restricting surface 65 is provided on the opposite side of the pressing portion 64 in the insertion direction D2 of the valve body 3. The first restricting surface 65 is in contact with the inner portion 51a of the second seal portion 51 and restricts the inner portion 51a of the second seal portion 51 pressed by the moving member 8 from moving in the insertion direction D2 of the valve body 3. Specifically, it is preferable that the first restricting surface 65 is disposed at a position overlapping both the inner portion 51a of the second seal portion 51 and the moving member 8 when viewed from a line of sight parallel to the insertion direction D2 of the valve body 3. This is because the first restricting surface 65 can appropriately receive the inner portion 51a of the second seal portion 51 pressed in the insertion direction D2 of the valve body 3.

[0024] The tip end (third seal portion 52) of the first seal member 5 is fixed to the pressing portion 64 of the support member 6. The third seal portion 52 and the pressing portion 64 can be fixed by any fixing means such as fixing with a bolt or fixing with an adhesive. For example, in the case of fixing with a bolt, a bolt protruding upward is fixed to the annular portion constituting the third seal portion by adhesive or fitting, a bolt hole penetrating vertically is opened in the pressing portion 64, and the upward bolt of the third seal portion is passed through the bolt hole of the pressing portion 64 from below and fixed. The lower end (third seal portion 52) of the U-shaped portion of the first seal member 5 of the first embodiment is easily affected by the pressure of the fluid from the upstream to the downstream of the fluid pipe K when the valve body 3 is opened and closed, and the lower end (third seal portion 52) of the first seal member 5 is easily dropped off from the support member 6. By fixing the third seal portion 52 to the pressing portion 64 of the support member 6, it is possible to suppress or prevent this dropping off.

[0025] The pair of first openings 63a of the support member 6 accommodate a portion of the second seal portion 51. The support member 6 has a pair of second restriction surfaces 66 (see Figs. 4, 7, and 8). The pair of second restriction surfaces 66 sandwich at least a portion of the second seal portion 51 disposed in the pair of first openings 63a from both the upstream and downstream sides of the valve body 3. The pair of second restriction surfaces 66 restrict the second seal portion 51 from deforming toward the upstream and downstream sides of the valve body 3. This makes it easier to deform the second seal portion 51 toward the outside in the pipe diameter direction of the fluid pipe K (diameter expansion direction D3).

[0026] In the first seal member 5, in the insertion direction D2 of the valve body 3, a communication passage 53 communicating with the upstream and downstream of the valve body 3 is formed. This communication passage 53 is closed by the movement of the moving member 8 relative to the support member 6 in the insertion direction D2 of the valve body 3. In the first embodiment, a third opening 54 that opens in three directions, the upstream and downstream of the valve body 3 and the insertion direction D2 of the valve body 3, is formed at the end of the first seal member 5 in the insertion direction D2 of the valve body 3. The third opening 54 forms the communication passage 53. The third opening 54 of the first seal member 5 and the second opening 63b of the support member 6 are in communication. As the moving member 8 moves in the insertion direction D2 of the valve body 3, the second seal member 7 provided at the tip of the rod-shaped portion 80 of the moving member 8 advances in the third opening 54 and the second opening 63b, and the second seal member 7 comes into close contact with the inner wall of the fluid pipe K in the insertion direction D2 of the valve body 3, and the communication passage 53 is closed.

[0027] <How to assemble the valve device> As shown in FIG. 4, the support member 6 is inserted into the first seal member 5, and the first seal member 5 is supported by the support member 6. Next, the movable member 8 is inserted into the inside (accommodation chamber 63) of the support member 6. The pair of protruding pieces 81 of the movable member 8 are fitted into the pair of slits 63c in the accommodation chamber 63. The pair of slits 63c allows the movable member 8 to slide relative to the support member 6 without rotating. Next, the fixed member 9 is attached to the support member 6 using the fastener S2, so that the movable member 8 does not come off from the support member 6. This completes the valve body 3 of the valve device 1.

[0028] <Water-stopping mechanism of valve device (construction method)> The valve body 3 assembled by the above-mentioned valve device assembly method is inserted into the fluid pipe K as shown in Fig. 3, and the first seal portion 50 is brought into close contact with the edge of the through-hole K1 as shown in Fig. 9. When the operation of the valve shaft 30 is continued, the moving member 8 further advances in the insertion direction D2 of the valve body 3, and the moving member 8 presses the first seal member 5 and the support member 6, and the third seal portion 52 is pressed against the bottom wall of the fluid pipe K. At this time, the fluid pipe K is not blocked, and the two gaps on the sides of the second seal portion 51 and the communication passage 53 are open, so that the flow of the fluid is not stopped.

[0029] When the operation of the valve shaft 30 is further continued, the moving member 8 moves downward relative to the supporting member 6 while the supporting member 6 is stopped, and the moving member 8 presses the inner portion 51a of the second seal portion 51 in the radial expansion direction D3 and the insertion direction D2 of the valve body 3. The movement of the inner portion 51a of the second seal portion 51 in the insertion direction D2 of the valve body 3 is restricted by the first restricting surface 65 of the pressing portion 64 of the supporting member 6. Furthermore, the inner portion 51a of the second seal portion 51 is sandwiched from both the upstream and downstream sides of the valve body 3 by a pair of second restricting surfaces 66. Therefore, the second seal portion 51 is easily deformed in the radial expansion direction D3, and as shown in FIG. 10, the second seal portion 51 is deformed in the radial expansion direction D3, and the gap that existed on the side of the valve body 3 is closed. At this time, the communication passage 53 is in an open state. If the communication passage 53 has already been blocked when the second seal portion 51 blocks the gap, the second seal portion 51 must also deform against the pressure of the fluid, which may require a large operating force on the valve stem 30 or may result in the second seal portion 51 not properly closing the gap. However, since the communication passage 53 remains open until the second seal portion 51 has completely closed the gap, the second seal portion 51 can properly close the gap. The timing at which the communication passage 53 is blocked can be adjusted by the length of the rod-shaped portion 80 of the moving member 8.

[0030] After the second seal portion 51 has completed closing the gap, if the operation of the valve shaft 30 is continued, the movable member 8 moves downward relative to the support member 6 while the support member 6 is stationary, and the second seal member 7 provided on the movable member 8 closes the communicating passage 53, as shown in Figure 11.

[0031] When the valve body 3 is opened, the movable member 8 moves upward relative to the support member 6, and the second seal member 7 provided on the movable member 8 moves from a state in which it has been blocking the communication passage 53 to a state in which it opens the communication passage 53. Furthermore, as the opening operation of the valve body 3 continues, the second seal portion 51 contracts in diameter. At this time, the communication passage 53 opens before the second seal portion 51 deforms, so the opening operation can be performed smoothly.

[0032] [Second embodiment] The second embodiment will be described with reference to Fig. 12. In the second embodiment, unlike the first embodiment, the communication passage 53 is not provided, and therefore the moving member 8 does not close the communication passage 53, and the second seal member 7 is not provided. The other configurations are the same as those of the first embodiment.

[0033] The operation of the valve device 1 of the second embodiment will be described. The valve body 3 assembled by the above-mentioned assembly method of the valve device 1 is inserted into the fluid pipe K, and the first seal portion 50 is brought into close contact with the edge of the through hole K1. When the operation of the valve shaft 30 is continued, the moving member 8 further advances in the insertion direction D2 of the valve body 3, and the moving member 8 presses the first seal member 5 and the support member 6, and the third seal portion 52 is pressed against the bottom wall of the fluid pipe K. At this time, the fluid pipe K is not blocked, and the two side gaps of the second seal portion 51 are open, and the flow of the fluid is not stopped. When the operation of the valve shaft 30 is further continued, as shown in FIG. 12, the moving member 8 moves downward relative to the support member 6 while the support member 6 is stopped, and the moving member 8 presses the inner portion 51a of the second seal portion 51 in the radial expansion direction D3 and the insertion direction D2 of the valve body 3. The movement of the inner portion 51a of the second seal portion 51 in the insertion direction D2 of the valve body 3 is restricted by the first restriction surface 65 of the pressing portion 64 of the support member 6. Furthermore, the inner portion 51a of the second seal portion 51 is sandwiched from both the upstream and downstream sides of the valve body 3 by a pair of second restriction surfaces 66. Therefore, the second seal portion 51 is easily deformed in the radial expansion direction D3, and as shown in Fig. 10, the second seal portion 51 deforms in the radial expansion direction D3, and the gap that existed on the side of the valve body 3 is closed.

[0034] In this way, by pressing the first seal member 5 in the insertion direction D2 of the valve body 3 with the support member 6, the second seal portion 51 is expanded in diameter and is less likely to deform. However, as described above, pressing is performed with the moving member 8 separate from the support member 6, so that the second seal portion 51 can be appropriately deformed.

[0035] <Modification> (A) In the above embodiment, the fluid pipe K is a water pipe, but is not limited to this.

[0036] (B) In the above embodiment, the first seal member 5 has a shape in which an annular portion and a U-shaped portion are joined together, and the support member 6 is open (not covered) on both the upstream and downstream sides of the valve body 3, but the shape of the first seal member 5 can be changed as appropriate. For example, as shown in Fig. 13, the first seal member 5 may cover the support member 6 from both the upstream and downstream sides of the valve body 3.

[0037] (C) In the above embodiment, the rubber hardness of the first seal portion 50 is softer than the rubber hardness of at least a part of the second seal portion 51, but this is not limited to the above. The hardness of the first seal portion 50 and the second seal portion 51 may be the same. In addition, the interface between the high hardness portion and the low hardness portion of the first seal member 5 can be changed as appropriate.

[0038] [1] As described above, although not particularly limited, as in the first and second embodiments, the valve device 1 includes the valve body 3 that can be inserted into the fluid pipe K through a through hole K1 formed in the fluid pipe K, and the valve body 3 includes a first seal member 5 having a first seal portion 50 for sealing the edge of the through hole K1 and a second seal portion 51 that is deformable in a radial expansion direction D3 perpendicular to the insertion direction D2 of the valve body 3 and expands outward in the radial direction of the fluid pipe K to seal the inner wall of the fluid pipe K, a support member 6 that supports the first seal member 5, and a support member 6 that is deformable in the insertion direction D2 of the valve body 3. and a movable member 8 that is movable relative to the support member 6, and the movable member 8 moves relative to the support member 6 in the insertion direction D2 of the valve body 3, so that the movable member 8 presses the second seal portion 51 and deforms the second seal portion 51 in the radial expansion direction D3, and a communication passage 53 that communicates with the upstream and downstream of the valve body 3 is formed in the insertion direction D2 of the valve body 3 in the first seal member 5, and the communication passage 53 is blocked by the movable member 8 that moves relative to the support member 6 in the insertion direction D2 of the valve body 3.

[0039] By pressing the first seal member 5 in the insertion direction D2 of the valve body 3 with the support member 6, the second seal portion 51 is expanded in diameter and is less likely to deform. However, as described above, pressing is performed with the moving member 8 separate from the support member 6, so that the second seal portion 51 can be appropriately deformed. Furthermore, because the communication passage 53 is closed by the movable member 8, it is possible to control the timing of closing the communication passage 53 after the second seal portion 51 has been deformed in the radial expansion direction D3 accurately in advance. As a result, by keeping the communication passage 53 open and not blocked at the time when the second seal portion 51 is closed, it is possible to prevent the pressure of the fluid from interfering with the closing of the second seal portion 51, it is possible to reduce the force required to close the second seal portion 51, and it is possible to appropriately deform the second seal portion 51.

[0040] [2] The valve device 1 described in [1] above may be configured such that the first sealing member 5 has a third sealing portion 52 for sealing the inner wall of the fluid pipe K in the insertion direction D2 of the valve body 3, the support member 6 has a pressing portion 64 for pressing the third sealing portion 52 in the insertion direction D2 of the valve body 3, and the pressing portion 64 has a first regulating surface 65 for regulating the movement of the inner portion 51a of the second sealing portion 51 pressed by the moving member 8 in the insertion direction D2 of the valve body 3. With this configuration, the second seal portion 51 is more likely to deform in the radial expansion direction D3 without deforming in the insertion direction D2 of the valve body 3, making it possible to more appropriately achieve close contact of the second seal portion 51 with the inner wall of the fluid pipe K.

[0041] [3] In the valve device 1 described in the above [2], the first seal member 5 may be fixed to the pressing portion 64. According to this configuration, when the valve body 3 is opened or closed, it is possible to prevent the first seal member 5 from falling off the support member 6 due to the influence of the pressure of the fluid flowing from the upstream to the downstream of the fluid pipe K.

[0042] [4] In the valve device 1 described in any one of [1] to [3] above, the support member 6 may have a pair of second regulating surfaces 66 that sandwich at least a portion of the second seal portion 51 from both the upstream and downstream sides of the valve body 3, and the pair of second regulating surfaces 66 may regulate the second seal portion 51 from deforming toward the upstream and downstream sides of the valve body 3. With this configuration, the second seal portion 51 is more likely to deform in the radial expansion direction D3 without deforming upstream or downstream of the valve body 3, making it possible to more appropriately achieve close contact of the second seal portion 51 with the inner wall of the fluid pipe K.

[0043] [5] In the valve device 1 described in any one of [1] to [4] above, the movable member 8 may have a second seal member 7 formed separately from the first seal member 5, and the second seal member 7 may block the communicating passage 53. According to this configuration, the same seal member as the first seal member 5 is not deformed, so that the communication passage 53 is easily blocked.

[0044] [6] The valve device 1 described in [5] above may have an opening (third opening 54) formed at the end of the first sealing member 5 in the insertion direction D2 of the valve body 3, the opening opening in three directions, namely, the upstream and downstream of the valve body 3 and the insertion direction D2 of the valve body 3, and the opening (third opening 54) forming a communicating passage 53. This is a preferred embodiment for blocking the communication passage 53.

[0045] [7] In the valve device 1 according to any one of the above [1] to [6], at least a part of the second seal portion 51 may be harder than the first seal portion 50. According to this configuration, sealing by the first seal portion 50 and sealing by the second seal portion 51 can be appropriately achieved.

[0046] [8] Although not particularly limited, as in the first and second embodiments, the method of installing the valve device 1 is a method of installing the valve device 1 in which the valve body 3 is inserted into the fluid pipe K through a through hole K1 formed in the fluid pipe K in a state of uninterrupted flow, and the valve body 3 includes a first seal member 5 having a first seal portion 50 for sealing the edge of the through hole K1 and a second seal portion 51 that is deformable in a radial expansion direction D3 perpendicular to the insertion direction D2 of the valve body 3 and expands outward in the pipe radial direction of the fluid pipe K in order to seal the inner wall of the fluid pipe K, a support member 6 that supports the first seal member 5, and a movable member 8 that is movable relatively to the support member 6 in the insertion direction D2 of the valve body 3. , a communication passage 53 communicating with the upstream and downstream of the valve body 3 is formed in the first seal member 5 in the insertion direction D2 of the valve body 3, and the valve body 3 is inserted into the fluid pipe K to bring the first seal portion 50 into close contact with the edge of the through hole K1; moving the movable member 8 relative to the support member 6 in the insertion direction D2 of the valve body 3, and pressing the second seal portion 51 with the movable member 8 to deform the second seal portion 51 in the radial expansion direction D3; and blocking the communication passage 53 by the movable member 8 which moves relative to the support member 6 in the insertion direction D2 of the valve body 3 after the second seal portion 51 has deformed.

[0047] [9] Although not particularly limited, as in the first and second embodiments, a method of assembling a valve device 1 may be a method of assembling a valve device 1 having a valve body 3 that can be inserted into a fluid pipe K through a through hole K1 formed in the fluid pipe K, and may include supporting a first seal member 5 on a support member 6, the first seal member 5 having a first seal portion 50 for sealing the edge of the through hole K1 and a second seal portion 51 that is deformable in a radial expansion direction D3 that is perpendicular to the insertion direction D2 of the valve body 3 and expands outward in the pipe radial direction of the fluid pipe K to seal the inner wall of the fluid pipe K, inserting a movable member 8 that is movable relative to the support member 6 in the insertion direction D2 of the valve body 3 into the inside of the support member 6, and attaching a fixed member 9 that prevents the movable member 8 from coming out of the support member 6 to the support member 6.

[0048] Although the embodiments of the present disclosure have been described above based on the drawings, the specific configurations should not be considered to be limited to these embodiments. The scope of the present disclosure is indicated not only by the description of the above-mentioned embodiments but also by the claims, and further includes all modifications within the meaning and scope equivalent to the claims.

[0049] The structures employed in the above-described embodiments may be employed in any other embodiment. The specific configurations of the components are not limited to the above-described embodiments, and may be modified in various ways without departing from the spirit of the present disclosure. [Explanation of symbols]

[0050] 1: Valve device 3: Valve body 5: First seal member 6: Support member 7: Second seal member 8: Moving parts 9: Fixing member 50: First seal part 51: Second seal part 51a:Inner part 52: Third seal part 53:Communication path 64: Pressing part 65: First Regulatory Surface 66: Second Regulatory Plane D2: Insertion direction D3: Diameter expansion direction K:Fluid pipe K1: Through hole

Claims

1. a valve body that can be inserted into a fluid pipe through a through hole formed in the fluid pipe, The valve body is a first seal member having a first seal portion for sealing an edge of the through hole, and a second seal portion deformable in a radial expansion direction perpendicular to the insertion direction of the valve body and expanding radially outwardly of the fluid pipe in order to seal an inner wall of the fluid pipe; a support member for supporting the first seal member; a movable member that is movable relative to the support member in an insertion direction of the valve body; having When the movable member moves relative to the support member in the insertion direction of the valve body, the movable member can press the second seal portion to deform the second seal portion in the radial expansion direction, a communication passage that communicates with upstream and downstream of the valve body is formed in the first seal member in the insertion direction of the valve body, and the communication passage is blocked by the movable member that moves relative to the support member in the insertion direction of the valve body.

2. the first seal member has a third seal portion for sealing an inner wall of the fluid pipe in an insertion direction of the valve body, the support member has a pressing portion that presses the third seal portion in an insertion direction of the valve body, The valve device according to claim 1 , wherein the pressing portion has a first restriction surface that restricts an inner portion of the second seal portion pressed by the moving member from moving in the insertion direction of the valve body.

3. The valve device according to claim 2 , wherein the first seal member is fixed to the pressing portion.

4. 2. The valve device according to claim 1, wherein the support member has a pair of second regulating surfaces that sandwich at least a portion of the second seal portion from both the upstream and downstream sides of the valve body, and the pair of second regulating surfaces regulate the second seal portion from deforming toward the upstream and downstream sides of the valve body.

5. 2. The valve device according to claim 1, wherein the movable member has a second seal member formed separately from the first seal member, the second seal member closing the communication passage.

6. 6. The valve device according to claim 5, wherein an opening that opens in three directions, that is, upstream and downstream of the valve body and in the insertion direction of the valve body, is formed at an end of the first seal member in the insertion direction of the valve body, and the opening forms the communicating passage.

7. The valve arrangement of claim 1 , wherein at least a portion of the second seal portion is harder than the first seal portion.

8. A method for installing a valve device, comprising inserting a valve body into a fluid pipe through a through hole formed in the fluid pipe in an uninterrupted flow state, The valve body is a first seal member having a first seal portion for sealing an edge of the through hole, and a second seal portion deformable in a radial expansion direction perpendicular to the insertion direction of the valve body and expanding outward in a radial direction of the fluid pipe in order to seal an inner wall of the fluid pipe; a support member for supporting the first seal member; a movable member that is movable relative to the support member in an insertion direction of the valve body, a communication passage that communicates with an upstream side and a downstream side of the valve body is formed in the first seal member in an insertion direction of the valve body, The method comprises: inserting the valve body into the fluid pipe so that the first seal portion is brought into close contact with an edge of the through hole; moving the movable member relative to the support member in an insertion direction of the valve body, and pressing the second seal portion with the movable member to deform the second seal portion in the radial expansion direction; closing the communication passage by the movable member which moves relative to the support member in the insertion direction of the valve body after the second seal portion is deformed; A method for installing a valve device, comprising:

9. 1. A method for assembling a valve device including a valve body that can be inserted into a fluid pipe through a through hole formed in the fluid pipe, comprising the steps of: a first seal member having a first seal portion for sealing an edge of the through hole and a second seal portion deformable in a radial expansion direction perpendicular to the insertion direction of the valve body and expanding outward in a radial direction of the fluid pipe in order to seal an inner wall of the fluid pipe, the second seal member being supported by a support member; inserting a movable member into the support member, the movable member being movable relative to the support member in an insertion direction of the valve body; a fixing member for preventing the movable member from coming off the support member is attached to the support member; A method for assembling a valve device, comprising:

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