JPH09144912A - Valve device for fluid transport pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture of a valve device and reduce the manufacturing cost while an elastic seal member attached to a valve element and the seat surface of a valve seat are brought in pressure contact with each other when a valve is closed so that a contacting margin in the diametral direction of the center hole of the valve seat is equalized in the annular direction of the seat surface. SOLUTION: A valve element 7 by which the center hole 6b of a valve seat 6 can be closed and a valve operating mechanism C by which the valve element 7 is operated to be swingingly opened/closed, are arranged in a valve casing 4 equipped with a channel 3 communicated with the passing hole 2 of a fluid transport pipe A and a valve seat 6. An elastic seal member 9 brought in contact with the seat surface 6a of the valve seat 6 when a valve is closed, is attached on a side surface opposed to the valve seat 6 of the valve element 7, the allowance for allowing relative movement in a constant range along the seat surface 6a of the valve element 7 against the valve operating mechanism C, are arranged to a connecting part between the valve element 7 and the valve operating mechanism C and the valve operating mechanism C, and also a projection 8 is arranged on the side surface of the valve element 7 corresponding to the center hole 6 of the valve seat 6 so that the valve element 7 is moved in a direction where the center of the center hole 6b of the valve seat 6 and the center of the valve element 7 are matched to each other when the valve element 7 is operated to be closed while the elastic seal member 9 is compressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a channel wall in a valve box provided with a channel connectable with a through hole formed in a peripheral wall of a fluid transport pipe such as a water pipe or the like. A valve seat having an annular seat surface on one side in the direction, a valve body capable of closing the central hole of the valve seat, and a valve operation for opening and closing the valve body in a perspective direction relative to the seat surface of the valve seat. A mechanism and, provided on the valve box, on the side surface corresponding to the valve seat of the valve body,
The present invention relates to a valve device for a fluid transport pipe, which is provided with an elastic seal member that is pressed against the seat surface of the valve seat in a face-to-face contact state when the valve body is closed.

[0002]

2. Description of the Related Art A conventional valve device for a fluid transport pipe is shown in FIG.
As shown in FIG. 5, the flow path 51 in the valve box 50 is formed in a straight line along the centerline X direction of the through hole 52 of the fluid transport pipe A, and the flow path of the valve box 50 facing the flow path 51 is formed. A seat surface 53a of the valve seat 53 is formed on the wall 50a along an imaginary plane intersecting the center line X direction of the through hole 52 at an angle of 45 degrees, and the seat surface 53a corresponding to the seat surface 53a is formed. An elastic seal material 55 is fixed to the side surface of the valve body 54, which is pressed against the seat surface 53a in a face-to-face contact state when the valve body 54 is closed. Further, the valve operating mechanism C, which opens and closes the valve body 54 in the perspective direction with respect to the seat surface 53a of the valve seat 53, rotates about the valve box 50 in a posture along the center line X direction of the through hole 52. Flexible operating shaft 56
And the center line X of the through hole 52 as the operation shaft 56 rotates.
Screw piece 57 slidingly moving along the direction, and the through hole 5
2 includes a valve actuation body 58 which is pivotally supported by the valve box 50 so as to be swingable around an axis orthogonal to the center line X direction of the No. 2 and which is integrally formed with the valve body 54. The swing gear portion of the body 58 has a rack gear 5 formed on the screw piece 57.
A gear 60 meshing with the gear 9 is externally fitted and fixed.
Further, the valve box 50 is integrally formed with a semi-tubular half-joint body 50A that is externally mounted on the upper half of the circumferential wall of the fluid transport pipe A, and has a circumference of the half-joint body 50A. Of the semi-tubular half-split joint body 61 that is externally mounted on the lower half portion of the pipe peripheral wall and the connecting flange 50B that is formed so as to project horizontally from each of both end edges in the horizontal direction. The connecting flange 61A formed to protrude is removably fixedly connected via a bolt 62 and a nut 63, respectively.

[0003]

In this type of valve device for a fluid transport pipe, when the valve body 54 is closed by the valve operating mechanism C, the elastic sealing material 55 fixed to the valve body 54 and the valve are closed. The seat surface 53a of the seat 53 and the central hole 53 of the valve seat 53
It is important that the contacting amount in the diametrical direction of b is evenly pressed in the annular direction of the seat surface 53a. Therefore, conventionally, it is necessary to improve not only the processing accuracy of the entire valve box 50 including the seat surface 53a of the valve seat 53 but also the processing accuracy of the valve body 54 and the valve operating mechanism C assembled to the valve box 50. Moreover, the valve actuator 58 and the valve operating mechanism C
Since it is necessary to increase the mounting accuracy of the valve box 50 to the valve box 50, there is a problem that the manufacturing cost of the valve device increases. The present invention has been made in view of the above circumstances, and its purpose is to:
When the valve body is closed, the elastic sealing material attached to the valve body and the seat surface of the valve seat are evenly distributed in the annular direction of the seat surface in the diametrical direction of the central hole of the valve seat. It is to make it easy to manufacture the valve device and to reduce the manufacturing cost even when the valve device is pressed against.

[0004]

In order to achieve the above-mentioned object, a characteristic constitution of a valve device for a fluid transport pipe according to claim 1 of the present invention is that in the above-mentioned constitution, the valve body and the valve operating mechanism are At least one of the connecting portion or the valve operating mechanism is provided with a flexibility that allows relative movement within a certain range along the seat surface of the valve body with respect to the valve operating mechanism,
When the valve body is closed while compressing the elastic sealing material, the center of the center hole of the valve seat and the center of the valve body are aligned with the side surface of the valve body corresponding to the center hole of the valve seat. The point is that a protrusion is formed to move the valve body in the direction. According to this characteristic configuration, even if a manufacturing error or an assembly error occurs in the valve box, the valve body, the valve operation mechanism, etc., the valve operation mechanism closes the valve body to cause the elasticity of the valve body. When the seal member is pressed against the seat surface of the valve seat while being compressed, the protrusion formed on the side surface of the valve body within the range of interchange provided in the valve operating mechanism or the connecting portion or the valve operating mechanism and the connecting portion. While being guided by the elastic seal material to the peripheral edge of the center hole of the valve seat, the valve body is moved along the seat surface in a direction in which the center of the center hole of the valve seat and the center of the valve body coincide with each other. Therefore, even if the machining accuracy and the mounting accuracy of the valve box, the valve body, the valve operating mechanism, etc. are low, when the valve body is closed, the elastic sealing material attached to the valve body and the seat surface of the valve seat are Since the contact hole in the diametrical direction of the central hole of the valve seat can be pressed and pressed evenly in the annular direction of the seat surface, a valve with high sealing performance can be achieved while facilitating manufacturing and reducing manufacturing cost. The device can be manufactured.

A characteristic configuration of a valve device for a fluid transport pipe according to a second aspect of the present invention is that the surface of the elastic seal member which is in contact with the seat surface is formed as a flat surface. According to this characteristic configuration, for example, when the valve body is closed by the elastic sealing material itself, the elastic seal member is brought into contact with the peripheral edge of the center hole of the valve seat so that the center of the center hole coincides with the center of the valve body. Compared to the case where a tapered surface that guides the movement of the valve element is formed on, the elastic seal material and the seat surface of the valve seat can easily secure a sufficient contact margin in the diameter direction of the central hole, and the sealing performance is reliable. Can be increased.

A characteristic configuration of a valve device for a fluid transport pipe according to claim 3 of the present invention is that the flow path is L-shaped in a state of being orthogonal or substantially orthogonal to the center line of the through hole of the fluid transport pipe. The seat surface of the valve seat is formed along a plane intersecting obliquely with respect to the center line of the through hole, and the seat surface of the valve seat is formed on the flow path wall of the bent portion of the flow path. The perforation tool insertion passage that communicates with the flow path from the center line direction of
A point is that a lid formed on the valve box and closing the opening of the perforation tool insertion passage is detachably provided on the valve box. According to this characteristic configuration, when the through hole is formed in the pipe peripheral wall of the fluid transport pipe, not only can a part of the flow passage in the valve box mounted on the pipe peripheral wall be used as a passage for inserting the perforating tool, Since the valve body can also serve as the shut-off valve required when the punching tool is pulled out from the flow path, the cost and cost of using the flow path and the valve body of the valve device for the drilling work for the fluid transport pipe can be improved. It can be advantageously performed in terms of construction period.

According to a fourth aspect of the present invention, there is provided a characteristic feature of a valve device for a fluid transport pipe, wherein the valve operating mechanism is a rotatable operating shaft pivotally supported by a valve box in a posture along a center line direction of the through hole. A screw piece that moves along the direction of the center line of the through hole as the operation shaft rotates, and a shaft support for swinging around a shaft center orthogonal to the direction of the center line of the through hole in the valve box. And a gear that meshes with a rack gear formed on the outer surface of the screw piece is integrally formed on the valve actuating body. According to this characteristic configuration, since the rack gear is formed on the outer surface of the screw piece and the gear is integrally formed on the valve actuating body, the number of parts is reduced and the assembling work of the valve operating mechanism is facilitated. be able to.

According to a fifth aspect of the present invention, there is provided a characteristic configuration of a valve device for a fluid transport pipe, wherein a valve body is three-dimensionally oriented with respect to the valve body between the valve body and the valve body of the valve operating mechanism. Is provided with a connecting portion slidably connected to and a sliding restricting portion for restricting a relative sliding range of the connecting portion within a predetermined range. According to this characteristic configuration, even when the seat surface of the valve seat and the surface of the elastic sealing material of the valve body are not parallel at the valve closed position, the sliding operation of the valve body with respect to the valve actuating body in the three-dimensional direction results in elasticity. The surface of the sealing material can be pressed into contact with the seat surface of the valve seat substantially evenly, and the deterioration of the sealing performance due to partial contact between the surface of the elastic sealing material and the seat surface of the valve seat can be suppressed.

According to a sixth aspect of the present invention, there is provided a characteristic feature of a valve device for a fluid transport pipe, wherein the hemispherical connecting portion is a hemispherical projection formed so as to project from a rear surface of a valve body toward a valve actuating body, A first screw shaft portion projectingly formed from the top of the protrusion,
From the hemispherical recess of the valve actuating body which is fitted slidably relative to the hemispherical protrusion, the first mounting hole of the valve operating body through which the first screw shaft portion penetrates, and the first mounting hole. The valve includes a first female screw member that is screwed onto the tip side of the protruding first screw shaft portion, and the valve is provided between the hemispherical projection of the valve body and the hemispherical recess of the valve actuating body. The point is that a part of the elastic sealing material that covers the body is interposed. According to this characteristic configuration, it is possible to suppress the deterioration of the sealing performance due to the one-sided contact between the surface of the elastic seal material and the seat surface of the valve seat, by sliding the valve body in the three-dimensional direction with respect to the valve actuation body. Not only can this be done, but the generation of contact noise between the valve actuating element and the valve element can be suppressed by utilizing part of the elastic sealing material that covers the valve element.

According to a seventh aspect of the present invention, there is provided a characteristic feature of a valve device for a fluid transport pipe, wherein the sliding restricting portion is provided on a rear surface of the valve body and at a position apart from the connecting portion. A shaft, a second mounting hole of the valve actuating body through which the second screw shaft portion penetrates, and a second female screw member screwed to the tip end side of the second screw shaft portion protruding from the second mounting hole, The valve actuating body comprises an elastic body interposed between the inner peripheral surface of the second mounting hole and the outer peripheral surface of the second female screw member, and the inner diameter of the second mounting hole is set to the second screw. It is formed so as to be larger than the outer diameter of the shaft portion so as to allow relative sliding in the three-dimensional direction between the valve actuating body and the valve body within a certain range. According to this characteristic configuration, while allowing relative sliding of the valve actuating body and the valve body in the three-dimensional direction within a certain range,
An elastic body interposed between the valve actuating body and the second female screw member suppresses generation of contact noise between the inner peripheral surface of the second mounting hole of the valve actuating body and the outer peripheral surface of the second female screw member. You can

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] A valve device for a fluid transport pipe shown in Figs. 1 to 8 is a cast iron split valve which is detachably attached to a peripheral wall 1 of a fluid transport pipe A such as a water pipe made of cast iron pipe in an exterior state. T-shaped tube B
In addition, a cast iron valve box provided with a flow dividing flow passage 3 connected to a through hole 2 formed in a peripheral wall 1 of the fluid transport pipe A in a state of uninterrupted flow that does not stop the flow of fluid such as tap water. 4 is fastened and fixed with bolts 5 in a disassembled state, and the valve box 4
A valve seat 6 having an annular seat surface 6a on the axially upstream side (upstream side) of the flow path 3 is formed on the flow path wall 4a facing the flow path 3 of FIG. A valve body 4 made of cast steel capable of being operated and a valve operating mechanism C for swinging and opening and closing the valve body 7 in a perspective direction with respect to the seat surface 6a of the valve seat 6 are provided.
It is provided and configured. In addition, the entire circumference of the valve body 7 is covered with an elastic sealing material 9 such as synthetic rubber (for example, styrene-butadiene rubber), and the surface of the elastic sealing material 9 that abuts the seat surface 6a is closed. It is formed in a flat surface along the seat surface 6a of the valve seat 6.

The split T-shaped tube B is mounted so as to hold the pipe peripheral wall 1 from one side surface side in the pipe radial direction, that is, to mount the upper half part side of the pipe peripheral wall 1 from the upper surface side. The cast iron semi-tubular first half joint body 20 is mounted so as to hold the pipe peripheral wall 1 from the other side surface side in the pipe radial direction, that is, the lower half of the pipe peripheral wall 1 is held from the lower surface side. The cast iron semi-tubular second half joint body 21 to be mounted, and the connecting flange 20A and the second half joint which are formed to project horizontally from each of both circumferential edges of the first half joint body 20. The body 21 is composed of a bolt 22 and a nut 23 for respectively tightening and connecting a connecting flange 21A formed in a horizontal direction from each of both circumferential edges of the body 21. Further, the first half joint body 20 has a connection pipe portion 20C provided with a connection port 20B communicating with the through hole 2 and a ring-shaped ring which is pressed around the through hole 2 on the outer peripheral surface of the pipe peripheral wall 1. An annular recess 20D that holds the elastic packing 24 is formed.

The flow path 3 in the valve box 4 is bent and formed in an L shape in a state of being orthogonal or substantially perpendicular to the center line X of the through hole 2 of the fluid transport pipe A, and the flow path 3 A seat surface 6a of the valve seat 6 is formed on the flow path wall 4a at the bent portion along an imaginary plane intersecting the center line X of the through hole 2 at an angle of 45 degrees, and On the upper side of the box 4, a punching tool insertion passage 10 communicating with the flow path 3 from the direction of the center line X of the through hole 2 is formed. Also,
In the valve box 4, a first tubular portion 4A that constitutes a flow passage portion on the downstream side of the flow passage 3 and a second tubular portion 4B that forms the perforation tool insertion passage 10 are formed, The first tubular portion 4A
A first male screw 4b for connecting and connecting the flow dividing pipe D is formed on the outer peripheral surface of the above, and the opening of the perforation tool insertion passage 10 is closed on the outer peripheral surface of the second tubular portion 4B. A second male screw 4c is formed for detachably screwing the lid 11, and a sheet packing 12 is provided between the lid 11 and the end surface of the second tubular portion 4B.

The valve operating mechanism C is constructed as follows. As shown in FIGS. 3 to 5, the valve box 4 communicates with the upstream side of the flow path 3, that is, between the seat surface 6a of the valve seat 6 and the connection port 20B of the split T-shaped pipe B. A valve operating chamber S communicating with a flow passage portion located between the valve operating chamber S and the valve housing 4 is formed above the valve box 4, and the opening of the valve operating chamber S is opened by the O-ring 3.
The second lid 31 that is sealed via 0 is screwed and fixed to a female screw formed on the inner peripheral surface of the opening of the valve box 4 in a detachable state. A first bearing portion 31a penetratingly formed at a central position of the second lid body 31 and an inner wall surface of the valve operating chamber S side opposite to the first bearing portion 31a in a direction parallel to the center line X direction (vertical direction) of the through hole 2. The operation shaft 32, which is rotatable around an axial center along the center line X direction of the through hole 2, extends over the recessed second bearing portion 4d formed at the one end of the operation shaft 32. The operating shaft 32 is provided with an engaging portion 32a for a manually-operated rotary operating tool such as a wrench or a box wrench on the protruding shaft portion of the operating shaft 32.
The male screw portion 32b located in the valve operating chamber S has a structure shown in FIG.
As shown in FIG. 3, a screw that reciprocally slides along the center line X direction of the through hole 2 along the sliding guide surface 4e formed on the inner wall surface of the valve operating chamber S as the operating shaft 32 is rotated. Piece 3
3 is screwed together. Further, as shown in FIGS. 5 and 7, the male screw portion of the operation shaft 32 is provided on the inner wall surface of the valve box 4 facing the valve operation chamber S and at a position corresponding to the swing axis of the valve body 7. Three
Bearing portion 13 having a substantially hook shape that opens toward the 2b side
On the U-shaped bearing surface 13a of the bearing portion 13, around the axis orthogonal to the center line X direction of the through hole 2, that is, the pipe axis P direction of the fluid transport pipe A. A swinging fulcrum shaft 34A of a valve actuating body 34, which is swingable around an axis along, is detachably supported, and the screw piece 33 is attached to the swinging fulcrum shaft 34A of the valve operating body 34.
Fan-shaped gear 35 meshing with the rack gear 33a formed in
Are integrally formed. In addition, the diameter of the U-shaped bearing surface 13a of the bearing portion 13 is formed to be larger than the outer diameter of the swing fulcrum shaft 34A of the valve actuation body 34, and the direction along the seat surface 6a of the valve seat 6 is considered. It is configured to allow relative movement within a certain range in the diametrical direction of the swing fulcrum shaft 34A including.

The valve operating body 34 and the valve body 7 of the valve operating mechanism C
As shown in FIG. 3 and FIG.
4, a connecting portion E that slidably connects the valve body 7 along the hemispherical surface in a three-dimensional direction, and a sliding restricting portion F that restricts the relative sliding range of the connecting portion E to a predetermined range. Is provided.

The connecting portion E is formed so as to integrally project from the back surface of the valve body 7 toward the valve actuating body 34 side, and integrally project from the top of the hemispherical projection 40. A first screw shaft 41, a hemispherical recess 42 of the valve actuating body 34 that is slidably fitted to the hemispherical protrusion 40 in a three-dimensional direction, and a valve actuation through which the first screw shaft 41 penetrates. The first mounting hole 43 of the body 34, and the first mounting hole 43
First screwed to the tip side of the first screw shaft 41 protruding from the first
It is composed of a female screw member (hexagonal nut) 44.
Then, the inner diameter of the first mounting hole 43 is set to the first screw shaft 4
The outer diameter of the valve body 7 is larger than the outer diameter of the first mounting hole 43, and there is a gap between the inner surface of the first mounting hole 43 and the outer peripheral surface of the first screw shaft 41. It is configured to allow sliding in a three-dimensional direction within a certain range. Further, the hemispherical protrusion 40 of the valve body 7 and the valve actuating body 34
A part of the elastic sealing material 9 that covers the valve body 7 is interposed between the hemispherical recess 42 and the hemispherical recess 42.

The sliding restricting portion F is provided on the back surface of the valve body 7 and from the connecting portion E to the swing fulcrum shaft 34A of the valve operating body 34.
A second screw shaft 46 screwed and fixed to a portion distant to the side, a second mounting hole 47 of the valve actuating body 34 through which the second screw shaft portion 46 penetrates, and a second mounting hole 47 protruding from the second mounting hole 47. A second female screw member (hexagonal nut) 48 screwed to the tip side of the 2-screw shaft 46, and a second mounting hole 47 formed in the valve actuating body 34.
And a second elastic member 49 made of synthetic rubber (for example, styrene-butadiene rubber), which is fitted onto the second female screw member 48 so as to enter the large-diameter hole portion. The inner diameter of the small-diameter hole portion of the hole 47 is formed to be larger than the outer diameter of the second screw shaft 46, and the inner surface of the small-diameter hole portion of the second mounting hole 47 and the outer peripheral surface of the second screw shaft 46 are formed. With a gap of, the relative movement of the valve actuating body 34 and the valve body 7 along the hemispherical surface is allowed within a certain range while compressing the elastic body 49.

In the valve operating mechanism C and the connecting portion E between the valve operating mechanism C and the valve body 7, within a certain range along the seat surface 6a of the valve body 7 with respect to the valve operating mechanism C. There is flexibility to allow relative movement. As shown in FIGS. 4 and 5, this accommodation includes a gap formed between the inner surface of the first mounting hole 43 and the outer peripheral surface of the first screw shaft 41, and the second
The gap formed between the inner surface of the small-diameter hole portion of the mounting hole 47 and the outer peripheral surface of the second screw shaft 46, and the hemispherical projection 4 of the valve body 7.
0 and a relative movement allowance due to elastic compression of a part of the elastic sealing material 9 interposed between the hemispherical recess 42 of the valve actuator 34,
It is configured with a gap formed between the bearing surface 13a of the bearing portion 13 and the outer peripheral surface of the swing fulcrum shaft 34A of the valve actuating body 34, and a clearance of a meshing portion between the rack gear 33a of the screw piece 33 and the fan-shaped gear 35. Has been done. Further, as shown in FIGS. 3, 4, 6, and 8, the side surface of the valve body 7 corresponding to the center hole 6b of the valve seat 6 is provided with the valve body 7 while compressing the elastic sealing material 9. When the closing operation is performed, the protrusion 8 for moving the valve body 7 along the seat surface 6a in a direction in which the center of the center hole 6b of the valve seat 6 and the center of the valve body 7 are aligned with each other.
Are embedded in the elastic sealing material 9. In order to configure the protrusion 8, a plurality of sizes (three in the embodiment) smaller than the inner diameter of the central hole 6b of the valve seat 6 are used.
8A is formed integrally with the valve element 7 along the major axis direction of the valve element 7 (or the central hole 6b), and the elastic seal is formed on each of both ends of each of the protrusions 8A. When the valve body 7 is closed while compressing the material 9, the center of the valve body 7 and the center hole 6b of the valve seat 6 are cooperated with the peripheral edge of the central hole 6b of the valve seat 6 using the elastic sealing material 9 as a medium. An inclined surface 8a is formed to guide the valve element 7 along the seat surface 6a in a direction coinciding with the center of the sheet.

When the engaging portion 32a of the operating shaft 32 is rotated toward the valve closing side by an artificial rotating operation tool such as a spanner or a box wrench, the screw piece 33 moves downward along the center line X direction of the through hole 2. To the rack gear 3 of the screw piece 33.
The fan-shaped gear 35 meshing with 3a is rotated, and the valve actuating body 34 is swung toward the valve seat 6 around the axis of the fluid transport pipe A along the pipe axis P direction. At a position where the flat surface of the elastic seal material 9 covering the valve body 7 connected to the valve actuating body 34 is parallel to the seat surface 6a of the valve seat 6, the flat surface of the elastic seal material 9 and the valve seat 6 are arranged. When a slight gap is generated between the seat surface 6a and the operating shaft 32 is further rotated to the valve closing side from this state, the operating shaft 32 is positioned on the tip end side of the valve body 7, that is, the valve operating body. The corner portion of the elastic seal member 9 located at the position farthest from the swing fulcrum of 34 contacts the seat surface 6a of the valve seat 6, and the valve body 7 compresses the elastic body 49 and the valve actuation body 3
4, the elastic seal member 9 is pressed against the flat surface side of the elastic seal member 9 while being compressed over the entire seat surface 6a of the valve seat 6. When the elastic sealing material 9 located around the projection 8A is compressed due to this pressure contact, the inclined surface 8a of the projection 8A and the peripheral edge of the center hole 6b of the valve seat 6 are formed by using the elastic sealing material 9 as a medium. Of the center of the valve body 7 and the center hole 6 of the valve seat 6
Since the valve element 7 is guided to move along the seat surface 6a within the interchange range in the direction in which the center of b matches, even if there is a manufacturing error or an assembly error of the valve seat 6 or the valve element 7, etc. Make sure that the seat surface 6a of the valve seat 6 and the elastic sealing material 9 on the valve body 7 side are pressed against each other in a state where the center hole 6b of the valve seat 6 is evenly contacted in the radial direction of the seat surface 6a. Can be made.

[Second Embodiment] In the first embodiment,
When the valve body 7 is closed while compressing the elastic sealing material 9, the valve body 7 is moved along the seat surface 6a in a direction in which the center of the central hole 6b of the valve seat 6 and the center of the valve body 7 coincide with each other. The protruding portion 8 for moving is composed of a plurality of (three in this embodiment) protrusions 8A integrally formed along the major axis direction of the valve body 7 (or the central hole 6b). As shown, on the side surface of the valve body 7 corresponding to the center hole 6b of the valve seat 6, a disc-shaped projection 8B having a diameter smaller than the inner diameter of the center hole 6b of the valve seat 6 is integrated with the valve body 7. When the valve body 7 is closed on the outer peripheral surface of the disk-shaped projection 8B while compressing the elastic sealing material 9, the central hole of the valve seat 6 using the elastic sealing material 9 as a medium is formed. By cooperation with the peripheral edge of 6b, the valve body is oriented in a direction in which the center of the valve body 7 and the center of the center hole 6b of the valve seat 6 are aligned. The may be performed to form an inclined surface 8b which moves guided along the sheet surface 6a. Other configurations are the same as those in the first embodiment.

[Third Embodiment] In the first embodiment,
When the valve body 7 is closed while compressing the elastic sealing material 9, the valve body 7 is moved along the seat surface 6a in a direction in which the center of the central hole 6b of the valve seat 6 and the center of the valve body 7 coincide with each other. The protruding portion 8 for moving is composed of a plurality of (three in this embodiment) protrusions 8A integrally formed along the major axis direction of the valve body 7 (or the central hole 6b). As shown, an annular projection 8D having a size smaller than the inner diameter of the central hole 6b of the valve seat 6 is integrally formed on the side surface of the valve body 7 corresponding to the central hole 6b of the valve seat 6, and When the valve body 7 is closed on the outer peripheral surface of the annular projection 8C while compressing the elastic seal material 9, the elastic seal material 9 acts as a medium to cooperate with the peripheral edge of the central hole 6b of the valve seat 6 to form a valve. Guide and move the valve body 7 in a direction in which the center of the body 7 and the center of the center hole 6b of the valve seat 6 coincide with each other. It may be performed to form a slope 8d. Other configurations are the same as those in the first embodiment.

[Other Embodiments] The protrusion 8 formed on the side surface of the valve body 7 corresponding to the central hole 6b of the valve seat 6 closes the valve body 7 while compressing the elastic sealing material 9. When this is done, the elastic seal material 9 is used as a medium in cooperation with the peripheral edge of the center hole 6b of the valve seat 6 so that the center of the center hole 6b of the valve seat 6 and the center of the valve body 7 coincide with each other. The shape and size of the protrusion 8 can be appropriately changed as long as the member 7 can be moved along the seat surface 6a. In each of the above embodiments, the valve element 7 and the valve operating mechanism C are used.
The connection portion E and the valve operating mechanism C are provided with an accommodation allowing relative movement of the valve element 7 with respect to the valve operating mechanism C within a certain range along the seat surface 6a. It may be formed by forming only one of the portion E and the valve operating mechanism C. In each of the above-described embodiments, the entire valve body 7 is covered with the elastic seal material 9, but it is also possible to cover only one side surface of the valve body 7 corresponding to the valve seat 6 with the elastic seal material 9. The valve box 4 including the flow path 3 may be formed in a shape as shown in FIG. In short, channel 3
The shape of the valve box 4 including the can be appropriately changed according to the purpose of use and the like.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a front view of a valve device for a fluid transportation pipe showing a first embodiment.

FIG. 2 is a side view of a valve device for a fluid transport pipe.

FIG. 3 is an enlarged sectional front view of a valve device for a fluid transport pipe.

FIG. 4 is an enlarged sectional front view of a main part.

FIG. 5 is an enlarged cross-sectional view of a valve shaft support portion.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 3;

7 is a sectional view taken along line VII-VII in FIG.

FIG. 8 is an enlarged perspective view of a valve body.

FIG. 9 is an enlarged perspective view of a valve body showing a second embodiment.

FIG. 10 is an enlarged perspective view of a valve body showing a third embodiment.

FIG. 11 is an enlarged sectional front view showing a conventional valve device for a fluid transport pipe.

[Explanation of symbols]

 A fluid transport pipe C valve operating mechanism E connection part F sliding restriction part 1 pipe peripheral wall 2 through hole 3 flow path 4 valve box 4a flow path wall 6 valve seat 6a sealing surface 6b center hole 7 valve body 8 protrusion 9 elastic seal Material 10 Passage for inserting punching tool 11 Lid body 32 Operation shaft 33 Screw piece 33a Rack gear 34 Valve actuating body 35 Gear (fan gear) 40 Hemispherical protrusion 41 First screw shaft portion 42 Hemispherical recess 43 First mounting hole 44 First Female screw member 46 Second screw shaft portion 47 Second mounting hole 48 Second female screw member 49 Elastic body

Claims (7)

[Claims] 1. A flow channel wall (4) in a valve box (4) having a flow channel (3) communicatively connectable with a through hole (2) formed in a peripheral wall (1) of a fluid transport pipe (A). 4a), a valve seat (6) having an annular seat surface (6a) is formed on one side of the flow path (3) in the axial direction, and the central hole (6b) of the valve seat (6) can be closed. A valve body (7) and a valve operating mechanism (C) for opening and closing the valve body (7) in the direction of the seat surface (6a) of the valve seat (6) are provided in the valve box (4). With
The side surface of the valve body (7) corresponding to the valve seat (6) has a seat surface (6) of the valve seat (6) when the valve body (7) is closed.
A valve device for a fluid transport pipe, comprising: an elastic seal member (9) which is pressed into contact with a) in a face-to-face contact state, wherein a connecting portion (E) between the valve body (7) and the valve operating mechanism (C). ) Or at least one of the valve operating mechanism (C), the seat surface (6a) of the valve body (7) with respect to the valve operating mechanism (C).
Along with the elastic seal member (1) on the side surface of the valve body (7) corresponding to the central hole (6b) of the valve seat (6). When the valve body (7) is closed while compressing 9), the valve body (7) is oriented in a direction in which the center of the central hole (6b) of the valve seat (6) and the center of the valve body (7) coincide with each other. ) A valve device for a fluid transport pipe, which is formed with a protrusion (8) for moving (1). 2. The valve device for a fluid transport pipe according to claim 1, wherein a surface of the elastic sealing material (9) which is in contact with the seat surface (6a) is formed as a flat surface. 3. The flow path (3) is bent and formed in an L shape in a state of being orthogonal or substantially perpendicular to the center line of the through hole (2) of the fluid transport pipe (A), and the flow path is formed. The seat surface (6a) of the valve seat (6) is formed on the flow path wall (4a) at the bent portion of (3) along a plane that obliquely intersects the center line of the through hole (2). A passage (10) for inserting a perforating tool which is communicated with the flow path (3) from the center line direction of the through hole (2) is formed in the valve box (4), and the perforating tool insertion is further performed. The valve device for a fluid transport pipe according to claim 1 or 2, wherein a lid (11) for closing the opening of the use passage (10) is detachably provided on the valve box (4). 4. A rotatable operating shaft (32) pivotally supported by the valve box (4) in a posture along the center line direction of the through hole (2), and the valve operating mechanism (C). A screw piece (33) that moves along the direction of the center line of the through hole (2) as the shaft (32) rotates, and swings around an axis center that is orthogonal to the direction of the center line of the through hole (2). A valve actuating body (34) movably supported by a valve box (4), and the valve actuating body (34)
The valve device for a fluid transport pipe according to claim 1, 2 or 3, wherein a gear (35) that meshes with a rack gear (33a) formed on the outer surface of the screw piece (33) is integrally formed on the valve. 5. A valve actuator (3) of the valve operating mechanism (C).
4) and the valve body (7), a connecting portion (E) for connecting the valve body (7) to the valve operating body (34) slidably in a three-dimensional direction, and this connecting portion. The valve device for a fluid transport pipe according to claim 4, further comprising a sliding restriction portion (F) for restricting a relative sliding range in (E) to a predetermined range. 6. The connecting portion (E) has a hemispherical projection (40) formed so as to project from the back surface of the valve body (7) toward the valve actuating body (34) side, and the hemispherical projection (40). And a valve actuating body (3) fitted to the first screw shaft part (41) formed to project from the top part of the
4) hemispherical recess (42) and the first screw shaft portion (4)
1) The first mounting hole (4) of the valve actuator (34) through which
3) and the first protruding from the first mounting hole (43)
It is composed of a first female screw member (44) screwed to the tip side of the screw shaft portion (41), and has a hemispherical projection (40) of the valve body (7) and a valve actuating body (34). The valve device for a fluid transport pipe according to claim 5, wherein a part of the elastic sealing material (9) covering the valve body (7) is interposed between the valve and the hemispherical recess (42). 7. A second screw shaft portion (46) provided on the back surface of the valve body (7) and away from the connecting portion (E), wherein the sliding restriction portion (F) is provided. The second screw shaft portion (4
6) The second mounting hole (4) of the valve actuator (34) through which
7) and a second female screw member (4) screwed to the tip side of the second screw shaft portion (46) protruding from the second mounting hole (47).
8) and an elastic body (49) interposed between the inner peripheral surface of the second mounting hole (47) of the valve actuating body (34) and the outer peripheral surface of the second female screw member (48). In addition, the inner diameter of the second mounting hole (47) is set to the second screw shaft portion (4
The valve actuating body (34) is formed to have a diameter larger than that of 6).
The valve device for a fluid transport pipe according to claim 5 or 6, wherein relative sliding between the valve body and the valve body (7) in a three-dimensional direction is allowed within a certain range.