JP3662117B2 - Seat mounting structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal sheet in a rotary valve, a butterfly valve or the like, and relates to a sheet mounting structure for a metal sheet to a valve box.
[0002]
[Prior art]
Conventionally, some rotary valves and butterfly valves are equipped with a metal sheet. An example of this type of metal sheet mounting structure is shown in FIG. FIG. 3 shows a mounting structure of the metal sheet 2 in the rotary valve 1. The rotary valve body 3 has a valve body sheet 5 on the opening periphery of the open port 4, and a valve body sheet on the inner surface of the valve box 6. A metal sheet 2 slidably in contact with 5 is disposed. The metal sheet 2 has an annular shape, and is integrally formed with a seal portion 2a that is in sliding contact with the valve body sheet 5 and a seat portion 2b that supports the seal portion 2a. It is fixed to.
[0003]
[Problems to be solved by the invention]
In the above-described conventional configuration, the metal sheet 2 is directly fixed to the valve box 6 with the mounting bolts 7 prior to the insertion of the rotary valve body 3 during assembly, and after the rotary valve body 3 is inserted, Since the position of the metal sheet 2 cannot be adjusted due to the presence of the rotary valve body 3, it is necessary to virtually position the metal sheet 2 with respect to the rotary valve body 3 using shims or the like. In addition, when an overload of the rotary valve body 3 is accidentally applied to the metal sheet 2 during assembly, there is a problem that the metal sheet 2 is deformed and a desired sealing performance cannot be exhibited.
[0004]
The present invention solves the above-described problems, and an object thereof is to provide a sheet attachment structure for attaching a metal sheet so that the position can be adjusted after assembly.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the seat mounting structure according to the first aspect of the present invention includes a valve body that opens and closes a flow path in the valve box in the valve box so as to be rotatable about the axis of the valve stem. In a valve in which a metal sheet that is slidably contacted is disposed on the inner surface of the valve box, a metal sheet formed by integrally forming an annular seal portion that is slidably contacted with a valve body and a cylindrical barrel-shaped seat portion that supports the seal portion Is fitted in the flow path in the valve box, and is provided to be close to and away from the valve body in the axial direction of the flow path in the valve box, and the metal sheet and the valve box are disposed on the end face side of the seat portion of the metal sheet. Tighten the packing between the seat of the metal sheet and the packing holding ring by installing an annular packing holding ring that can move in the axial direction of the flow path in the valve box. Bolts are installed on the packing retainer ring, inside the valve box The sheet holding rings projecting and retracting screwed into the inner peripheral surface of the road in the axial direction of the valve box in the flow path on the end surface of the gland ring provided in contact, the sheet pressing ring of the valve box in the flow path By moving in and out in the axial direction, the seal portion and the seat portion of the metal sheet are integrally moved in the axial direction of the flow path in the valve box through the packing pressing ring .
[0006]
With the configuration described above, the seat pressing ring is rotated from the opening side of the flow passage in the valve box, and is pushed to the valve body side in the axial direction of the flow passage by screwing with the inner peripheral surface of the flow passage in the valve box and tightened. The packing holding ring and the metal sheet connected with the attached bolt are moved together with the packing to the valve body side, and the seal portion of the metal sheet is brought into contact with the valve body. Therefore, the metal sheet can be positioned with respect to the valve body after the assembly in which the valve body is disposed in the valve box, and a precise sealing performance can be ensured. Moreover, at the time of assembly, by disposing the metal sheet in a state of being separated from the valve body, it is possible to avoid a situation where the metal sheet receives an overload of the valve body when the valve body is mounted.
In the seat mounting structure according to the second aspect of the invention, the seal portion has a flexible support portion having a U-shaped cross section that is curved in the radial direction, and is integrally formed on the seat portion via the flexible support portion. is there.
According to this, the sealing performance can be enhanced by the preload given by the elasticity in the flexible support portion.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 2, the rotary valve 11 is formed by dividing the valve box 12 into a first valve box 12 a and a second valve box 12 b in the fluid flow direction. A rotary valve body 14 that opens and closes the passage 13 is rotatably arranged around the shaft center of the valve rod 15 and the trunnion 15a, and an operating device 16 is connected to the proximal end side of the valve rod 15.
[0008]
The rotary valve body 14 is formed by integrally forming a cylindrical open port portion 14a and a bottomed cylindrical closed port portion 14b disposed in a direction orthogonal to the axis of the open port portion 14a. And the valve body sheet | seat 17 is provided in the opening peripheral part of the closed port part 14b, and the valve body seal | sticker part 17a is formed in the valve body sheet | seat 17 by the metal plating.
[0009]
A metal sheet 18 that is in sliding contact with the valve body sheet 17 of the rotary valve body 14 is disposed on the inner surfaces of the first valve box 12a and the second valve box 12b. The metal sheet 18 is formed by integrally forming an annular seal portion 18a that is in sliding contact with the valve body sheet 17 of the rotary valve body 14 at the valve body seal portion 17a, and a cylindrical body-shaped seat portion 18b that supports the seal portion 18a. In addition, the seat portion 18b is disposed so as to be fitted in the valve box flow path 13, and is provided so as to be able to approach and separate from the rotary valve body 14 in the axial direction of the valve box flow path 13. The seal portion 18 a has a flexible support portion 18 c having a U-shaped cross section that is curved in the radial direction, and a predetermined gap t between the end surface of the flexible support portion 18 c and the inner surface of the valve box 12 in the moving direction of the metal sheet 18. Is provided. An annular protrusion 18d protruding in the axial direction is formed on the end face side of the seat 18b of the metal sheet 18.
[0010]
An annular packing retainer ring 19 disposed to face the metal sheet 18 is provided so as to be movable in the axial direction of the flow path 13 in the valve box, and an annular protrusion 18d on the side facing the seat portion 18b of the metal sheet 18. A small diameter portion 19a that fits inside is provided, and a packing 20 for sealing a gap between the outer peripheral surface of the metal sheet 18, the valve box 12, and the inner peripheral surface is disposed in the small diameter portion 19a. The packing retainer ring 19 has a plurality of tightening bolts 21 screwed into the metal sheet 18. The tightening bolt 21 tightens the packing 20 between the seat portion 18 b of the metal sheet 18 and the packing retainer ring 19. . On the end face side of the packing pressing ring 19, there is provided a sheet pressing ring 22 which is screwed into the inner peripheral surface of the valve box flow path 13 and moves in and out in the axial direction of the flow path.
[0011]
With the above-described configuration, the metal sheet 18 is mounted on the first valve box 12a and the second valve box 12b from the inside of the valve box 12 and rotated to the first valve box 12a in the state where the valve box 12 is divided at the time of assembly. The valve body 14 is inserted, the valve rod 15 and the trunnion 15a are mounted, the rotary valve body 14 is disposed at a predetermined position, the first valve box 12a and the second valve box 12b are joined, and the bolts 12c are connected and fixed.
[0012]
Next, the packing 20 and the packing holding ring 19 are inserted from the opening side of the flow path 13 in the valve box, the packing holding ring 19 is connected to the metal sheet 18 with the fastening bolts 21, and the packing 20 is appropriately tightened. Further, the seat pressing ring 22 is inserted to a predetermined position where it is threadedly engaged with the inner peripheral surface of the valve box internal flow path 13, and then the rotation of the flow path is achieved by screwing with the inner peripheral surface of the valve box internal flow path 13. In the axial direction, it is pushed out to the rotary valve body 14 side, and the packing holding ring 19 and the metal sheet 18 are moved together with the packing 20 to the rotary valve body 14 side.
[0013]
While adjusting the gap between the metal sheet 18 and the rotary valve body 14, the tightening bolt 21 is tightened, the packing 20 is pressed against the inner peripheral surface of the flow passage 13 in the valve box, and finally the elasticity in the flexible support portion 18c The seal portion 18a of the metal sheet 18 is brought into contact with the valve body seal portion 17a of the valve body sheet 17 while being preloaded with an appropriate surface pressure. Even after this, the sealability of the packing portion 20 can be adjusted by tightening the tightening bolt 21.
[0014]
Therefore, after assembly, the metal sheet 18 can be precisely positioned with respect to the rotary valve body 14 to ensure the sealing performance, and the sealing performance can be enhanced by the preload provided by the elasticity in the flexible support portion 18c. In addition, by arranging the metal sheet 18 in a state of being separated from the rotary valve body 14 during assembly, it is possible to avoid a situation in which the metal sheet 18 receives an overload of the rotary valve body 14 when the rotary valve body 14 is mounted. 18 can be prevented from being deformed, and a reliable mounting operation without failure can be performed. Even when fluid leakage occurs due to changes over time during use, the surface pressure is increased by tightening the seat pressing ring 22, or the tightening bolt 21 is tightened or the packing 20 is replaced. It can be easily dealt with.
[0015]
【The invention's effect】
As described above, according to the first invention, the metal sheet can be positioned with respect to the valve body after assembly by rotating the seat pressing ring from the opening side of the flow passage in the valve box. The sealing performance of the packing can be adjusted by tightening the tightening bolts, and the metal sheet is placed away from the valve body during assembly so that the metal sheet is overloaded when the valve body is installed. Can be avoided. Furthermore, fluid leakage due to changes over time can be easily coped with by tightening the sheet pressing ring and the tightening bolt, or by replacing the packing.
Further, according to the second aspect of the invention, the sealing performance can be enhanced by the preload given by the elasticity in the flexible support portion.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rotary valve in an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A in FIG.
FIG. 3 is a schematic diagram showing a conventional seat mounting structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Rotating valve 12 Valve box 12a 1st valve box 12b 2nd valve box 13 Flow path 14 in valve box Rotating valve body 14a Open port part 14b Closed port part 15 Valve rod 17 Valve body sheet | seat 17a Valve body seal | sticker part 18 Metal sheet 18a Seal portion 18b Seat portion 18c Flexible support portion 19 Packing holding ring 20 Packing 21 Tightening bolt 22 Sheet holding ring

Claims (2)

In a valve in which a valve body that opens and closes the flow path in the valve box is arranged in the valve box so as to be rotatable around the axis of the valve stem, and a metal sheet that is in sliding contact with the valve body is arranged on the inner surface of the valve box. A metal sheet formed by integrally forming an annular seal portion that is in sliding contact with a cylindrical barrel-shaped seat portion that supports the seal portion is disposed with the seat portion fitted in the flow path in the valve box, In the axial direction of the flow path, it is provided so as to be able to approach and separate from the valve body, and a packing for sealing the gap between the metal sheet and the valve box is disposed on the end surface side of the seat portion of the metal sheet, and an annular packing holding ring is provided for the valve. Provided to be movable in the axial direction of the flow path in the box. A tightening bolt is provided on the packing retainer ring to tighten the packing between the seat of the metal sheet and the packing retainer ring. sheet press for projecting and retracting in the axial direction of the valve box in the flow path engaged Contact provided swell on the end face side of the gland ring, by causing projecting and retracting the sheet pressing ring in the axial direction of the valve box in the flow path, through a gland ring, seal portion and the seat of the metal sheet A seat mounting structure characterized in that the portion is integrally moved in the axial direction of the flow path in the valve box . The seat mounting structure according to claim 1, wherein the seal portion has a flexible support portion having a U-shaped cross section that is curved in the radial direction, and is integrally formed with the seat portion via the flexible support portion.

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