JP2000046205A - Seat fitting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seat fitting structure to which a metal seat is fitted in a positionally regulating manner after the assembly. SOLUTION: A metal seat 18 is provided on a rotary valve element movably in the axial direction with a seat part 18a internally fitted to a flow path in a valve casing, a packing 20 is arranged on an end face side of the metal seat 18, an annular packing holding ring 19 is provided movable in the axial direction of the flow path in the valve casing, the packing 20 is tightened by a tightening bolt 21 between the seat part 18a of the metal seat 18 and the packing holding ring 19, and a seat holding ring 22 to be screwed in an inner circumferential surface of the flow path in the valve casing and advanced/retracted thereto/ therefrom in the axial direction of the flow path is allowed to abut on the end face side of the packing holding ring 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal sheet for a rotary valve, a butterfly valve and the like, and more particularly to a structure for attaching a metal sheet to a valve box.

[0002]

2. Description of the Related Art Conventionally, some rotary valves and butterfly valves are provided with a metal sheet. FIG. 3 shows an example of this type of metal sheet mounting structure. FIG. 3 shows a mounting structure of the metal sheet 2 in the rotary valve 1. The rotary valve element 3 has a valve element sheet 5 on the periphery of the opening of the open port 4, and a valve element sheet on the inner surface of the valve box 6. 5, a metal sheet 2 that slides on the metal sheet 5 is arranged. The metal sheet 2 has an annular shape, and is integrally formed with a seal portion 2a that slides on the valve body sheet 5 and a seat portion 2b that supports the seal portion 2a.
Directly fixed to.

[0003]

In the above-described conventional construction, 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. After the valve element 3 is inserted, the position of the metal sheet 2 cannot be adjusted due to the presence of the rotary valve element 3.
Positioning had to be performed virtually using a shim or the like. Also, during assembly, the rotary valve 3
Is applied to the metal sheet 2, the metal sheet 2
However, there was a problem that the desired sealing performance could not be exhibited.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a sheet mounting structure for mounting a metal sheet so that a position can be adjusted after assembly.

[0005]

In order to solve the above-mentioned problems, a seat mounting structure according to the present invention is arranged such that a valve element for opening and closing a flow passage in a valve box is rotatable around the axis of a valve stem in a valve box. In a valve in which a metal sheet slidably contacting the valve body is arranged on the inner surface of the valve box, an annular seal portion slidably contacting the valve body and a cylindrical body-shaped seat portion supporting the seal portion are integrally formed. The metal sheet is disposed such that the seat portion is fitted inside the flow path in the valve box, and is provided so as to be able to approach and separate from the valve body in the axial direction of the flow path in the valve box, and the end face side of the seat portion of the metal sheet. In addition, a packing for sealing the gap between the metal sheet and the valve box is arranged, and an annular packing holding ring is provided so as to be movable in the axial direction of the flow path in the valve box. Press the tightening bolt to tighten the packing Provided swell, those provided in contact with the sheet holding rings projecting and retracting in the axial direction of the flow path screwed to the inner peripheral surface of the valve box in the flow path on the end face side of the gland ring.

[0006] With the above structure, the seat press ring is rotated from the opening side of the flow path in the valve box, and is screwed with the inner peripheral surface of the flow path in the valve box so as to move toward the valve body in the axial direction of the flow path. The packing press ring and the metal sheet, which are pushed out and connected with the tightening bolts, are integrally moved together with the packing toward the valve body, 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 element after assembling in which the valve element is disposed in the valve box, and precise sealing performance can be ensured. In addition, by disposing the metal sheet at a distance from the valve body during assembly, it is possible to prevent the metal sheet from being overloaded by the valve body when the valve body is mounted.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2, the rotary valve 11
Moves the valve box 12 in the direction of fluid flow to the first valve box 12a.
And a second valve box 12b, and a rotary valve element 14 that opens and closes a flow path 13 in the valve box is provided inside the valve box 12 with a valve stem 15
And, it is arranged rotatably around the axis of the trunnion 15 a, and the operating device 16 is connected to the base end side of the valve rod 15.

The rotary valve element 14 has a cylindrical open port portion 14.
a and a bottomed cylindrical closed port portion 14b disposed in a direction perpendicular to the axis of the open port portion 14a, and a valve is provided on an opening peripheral portion of the open port portion 14a and the closed port portion 14b. The valve seat 17 is provided.
The valve body seal portion 17a is formed by a bank.

On the inner surfaces of the first valve box 12a and the second valve box 12b, a metal sheet 18 which is in sliding contact with the valve sheet 17 of the rotary valve 14 is arranged. The metal sheet 18 is formed by integrally forming an annular seal portion 18a that slides on 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 18 b is disposed so as to be fitted in the valve box flow path 13, and the rotary valve element 1 is arranged in the axial direction of the valve box flow path 13.
4 is provided so as to be able to approach and separate freely. The seal portion 18 a has a flexible support portion 18 c having a U-shaped cross section that curves 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. Metal sheet 1
An annular projection 18d protruding in the axial direction is formed on the end face side of the seat 18b of FIG.

An annular gasket holding ring 19 disposed opposite to the metal sheet 18 is provided so as to be movable in the axial direction of the flow path 13 in the valve box. The small diameter portion 19a has a small diameter portion 19a fitted in the annular projection 18d, and a packing 20 for sealing a gap between the outer peripheral surface of the metal sheet 18 and the valve box 12 and the inner peripheral surface is arranged in the small diameter portion 19a. Packing press ring 19
Has tightening bolts 21 screwed into the metal sheet 18 at a plurality of locations.
The packing 20 is tightened between the seat portion 18b of the above and the packing holding ring 19. Packing press ring 19
On the side of the end face, there is provided a sheet pressing ring 22 which is screwed into the inner peripheral surface of the flow path 13 in the valve box and protrudes and retreats in the axial direction of the flow path.

With the above-described configuration, at the time of assembly, 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 while the valve box 12 is divided, and the first valve box 12 is mounted. The rotary valve element 14 is inserted into the
5 and the trunnion 15a are mounted, the rotary valve body 14 is arranged at a predetermined position, the first valve box 12a and the second valve box 12b are joined, and connected and fixed with bolts 12c.

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 tightening bolts 21, and the packing 20 is properly tightened. . Further, the seat holding ring 22 is inserted to a predetermined position where it is screwed into the inner peripheral surface of the valve box inner passage 13, and then the flow passage is screwed with the inner peripheral surface of the valve box inner passage 13 by a rotation operation. The gasket is pushed out toward the rotary valve element 14 in the axial direction, and the packing holding ring 19 and the metal sheet 18 are moved integrally with the packing 20 toward the rotary valve element 14.

The tightening bolt 21 is tightened while adjusting the gap between the metal sheet 18 and the rotary valve body 14, and the packing 2
0 is pressed against the inner peripheral surface of the flow path 13 in the valve box, and finally the elastic portion of the flexible support portion 18 c causes the sealing portion 18 a of the metal sheet 18 to bear a suitable surface pressure on the valve body sealing portion 17 a of the valve body sheet 17. Abut while preloading.
Even after this, the sealing property of the packing portion 20 can be adjusted by tightening the tightening bolts 21.

Therefore, after assembling, the metal sheet 18 can be precisely positioned with respect to the rotary valve body 14 to secure the sealing property, and the sealing property can be enhanced by the preload given by the elasticity of the flexible support portion 18c. it can. And when assembling,
By disposing the metal sheet 18 away from the rotary valve body 14, it is possible to prevent the metal sheet 18 from being overloaded by the rotary valve body 14 when the rotary valve body 14 is mounted, and to prevent the metal sheet 18 from being deformed. In addition, reliable mounting work without failure can be performed. Further, even when a fluid leaks due to a temporal change during use, it is possible to increase the surface pressure by retightening the sheet holding ring 22, retighten the tightening bolt 21, or replace the packing 20. Can be easily dealt with.

[0015]

As described above, according to the present invention, the metal sheet is positioned with respect to the valve body after assembly by rotating the sheet pressing ring from the opening side of the flow path in the valve box. The sealing performance of the packing can be adjusted by tightening the tightening bolts, and by disposing the metal sheet away from the valve body during assembly, the metal sheet can be overloaded when the valve body is mounted. Can be avoided. Further, fluid leakage due to a change over time can be easily dealt with by retightening the sheet holding ring and the tightening bolt or by replacing the packing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a rotary valve according to 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 Rotary valve 12 Valve box 12a 1st valve box 12b 2nd valve box 13 Flow path in a valve box 14 Rotating valve 14a Open port 14b Closed port 15 Valve stem 17 Valve seat 17a Valve seal 18 Metal sheet 18a Seal part 18b Seat part 18c Flexible support part 19 Packing holding ring 20 Packing 21 Tightening bolt 22 Sheet holding ring

Claims (1)

[Claims] 1. A valve in which a valve element for opening and closing a flow path in a valve box is rotatably disposed around an axis of a valve rod in a valve box, and a metal sheet slidingly contacting the valve element is disposed on an inner surface of the valve box. In the above, a metal sheet obtained by integrally forming an annular seal portion slidingly contacting the valve body and a cylindrical body-shaped seat portion supporting the seal portion is disposed by fitting the seat portion inside the valve box flow path. At the same time, a packing is provided on the end face side of the seat portion of the metal sheet to seal the gap between the metal sheet and the valve box. A packing holding ring is provided so as to be movable in the axial direction of the flow path in the valve box, and a tightening bolt for tightening the packing is provided between the seat portion of the metal sheet and the packing holding ring on the packing holding ring. Screws into the inner peripheral surface and moves back and forth in the axial direction of the flow path Seat mounting structure, wherein the chromatography preparative retainer ring on the end face side of the gland ring that is provided in contact with.