JPH10252902A - Valve box sheet - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a valve box sheet that can be provided simply and reliably. SOLUTION: A seat mounting portion 28 is formed on an inner peripheral surface of a valve box 21 to protrude in a radial direction of a flow path in the valve box, and is provided between one side surface of the seat mounting portion 28 and an inner peripheral surface of the valve box 21. An annular sheet 23 is pressed into contact with the peripheral edge of the valve body when the flow path in the valve box is fully closed. Resin injection grooves 28 and 27 facing the inner peripheral surface of the valve box 21 and the seat 23 are formed along the circumferential direction of the valve box, and the resin injection grooves 28 and 27 are formed in the resin injection grooves 28 and 27 through the resin injection holes 29. Sheet 23 is filled with curable resin 30.
Is fixed to the inner peripheral surface of the valve box 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a valve box seat provided for a butterfly valve, a ball valve, an eccentric structure valve, and the like.

[0002]

2. Description of the Related Art For example, in an eccentric structure valve shown in FIG.
A valve shaft 3 is provided inside the valve box 1 in a direction crossing the flow path 2 in the valve box, and a valve body 4 is provided fixed to the valve shaft 3.
The valve shaft 4 is rotated by the
, And are arranged at a flow path fully open position as shown in FIG. 4 and a flow path fully closed position as shown in FIG.

A valve body 4 is provided on the inner peripheral surface of the valve box 1 when the flow path is fully closed.
Is provided with a valve box sheet 6 against which the peripheral edge portion is pressed, and the valve box sheet 6 secures the sealing performance when the flow path is fully closed. The mounting method of the valve box sheet 6 includes a bonding method, a holding plate method of fixing with a holding plate, a screwing method, a press fitting method, and the like.

FIG. 6 shows a valve box seat 6 mounted by press-fitting.
A radially projecting seat mounting portion 7 is formed on the inner peripheral surface of the valve box 1, and an annular seat 8 is press-fitted between the inner peripheral surface of the valve box 1 and the seat mounting portion 7. doing. For press-fitting, an acute angle V-shaped groove is formed between the inner peripheral surface of the valve box 1 and the seat mounting portion 7, and the seat 8 is formed by a rubber seat portion 10 having a seat surface 9 formed thereon. It is composed of a rubber sheet part 10 and a metal sheet part 11 fitted to the sheet mounting part 7.

[0005] Fig. 7 shows a valve box seat 6 mounted by a screw-in system. An internal thread 12 is formed on the inner peripheral surface of the valve box 1 along the circumferential direction of the valve box and radially. A metal sheet portion provided with a protruding sheet attachment portion 13, and a rubber sheet portion 15 having a seat surface 14 formed thereon and an external thread portion 16 screwed into the female thread portion 12 at the position of the sheet attachment portion 13. 17 and an O-ring 1 between the annular sheet 18 and the metal sheet portion 17.
9 are provided.

[0006]

However, in the above-mentioned conventional mounting method of the valve box sheet, in the case of the press-fitting method,
It is necessary to accurately form the inner peripheral surface of the valve box 1 and the metal sheet portion 11 so as to be fitted to each other. In the case of a screw-in system, the inner peripheral surface of the valve box 1 and the metal sheet portion 17 are respectively fitted. While forming the screw part 12 and the male screw part 16,
Since it is necessary to accurately form the sheet mounting portion 13 and the metal sheet portion 17 so as to fit each other, and to interpose the O-ring 19, there is a problem that processing and mounting operations are not easy.

An object of the present invention is to solve the above-mentioned problems and to provide a valve box sheet which can be provided simply and reliably.

[0008]

In order to solve the above-mentioned problem, the valve box seat according to the first aspect of the present invention is provided at a position eccentric from a valve shaft crossing a flow path in the valve box, A valve box seat that presses against a peripheral portion of a valve body that rotates around an axis, wherein a sheet mounting portion that protrudes in a radial direction of a flow path in the valve box is formed on an inner peripheral surface of the valve box and faces the valve body. Between the one side surface of the seat mounting portion and the inner peripheral surface of the valve box, an annular seat that presses against the peripheral portion of the valve body when the flow path in the valve box is fully closed is fitted, and the inner peripheral surface of the valve box is fitted. A resin injection groove facing the sheet is formed along the circumferential direction of the valve box. A resin injection hole communicating with the resin injection groove on the valve box side is formed through the valve box. The seat is fixed to the inner peripheral surface of the valve box by the curable resin filled in the resin injection groove and the seat-side resin injection groove. It is intended.

Preferably, the sheet comprises a metal core having a sheet-side resin injection groove formed therein, and an elastic material sheet covering the outer surface of the core and the periphery of the sheet-side resin injection groove. Provided.

As the curable resin, for example, an epoxy resin can be used. When assembling the valve box sheet as described above, the seat is moved along the axial direction of the flow path in the valve box and fitted between the seat mounting portion and the inner peripheral surface of the valve box, and the valve box side With the resin injection groove and the sheet-side resin injection groove facing each other, it is only necessary to inject the curable resin into the valve box-side resin injection groove and the sheet-side resin injection groove through the resin injection hole, so that work is easy. is there.

Further, since the space between the inner peripheral surface of the valve box and the seat is securely sealed by the cured resin, high precision is not required for the inner peripheral surface of the valve box, the seat mounting portion and the seat, and processing is easy. It is. After assembly, the resin cured inside the valve box-side resin injection groove and the seat-side resin injection groove engages with each groove, so that the seat does not move in the axial direction of the flow path and the seat is prevented from falling off. You. The seat made up of the metal core and the elastic seat can ensure the sealing performance between the valve body and the fitting and processing.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The valve box sheet according to the present invention is shown in FIG.
A valve body, such as an eccentric structure valve described with reference to FIG. 5, which has a valve shaft provided in a direction crossing the flow path in the valve box and rotates around the axis of the valve shaft to open and close the flow path in the valve box. The valve box sheet, which is pressed against the peripheral portion of the valve body when the flow path in the valve box is fully closed, can be widely applied to a valve provided at a position eccentric from the axis of the valve shaft. Description is omitted.

[0013] In the valve box sheet shown in Figs.
A seat mounting portion 22 protruding in the radial direction of the flow path in the valve box 21 is formed on the inner peripheral surface of the valve box 21 in an annular shape along the circumferential direction of the valve box 21. An annular sheet 23 is fitted between one side surface and the inner peripheral surface of the valve box 21 so as to be in pressure contact with the peripheral edge of the valve body when the valve box internal flow path is fully closed.

The annular sheet 23 includes a metal core 24 and a rubber sheet 26 having a sheet surface 25 formed thereon. A sheet-side resin injection groove 27 is formed on the outer peripheral surface of the core portion 24 along the circumferential direction thereof.
Numeral 6 is arranged so as to cover the outer surface of the core portion 24 and the peripheral edge of the sheet-side resin injection groove 27.

In the valve box 21, a valve box-side resin injection groove 28 having the same width as the sheet-side resin injection groove 27 is formed on the inner peripheral surface facing the sheet-side resin injection groove 27. A plurality of resin injection holes 29 communicating with the resin injection groove 28 and the outside of the valve box 21 are formed.

Valve box side resin injection groove 28 and resin injection hole 2
9 and a curable resin 30 inside the sheet-side resin injection groove 27.
The curable resin 30 allows the seat 2 to be seated on the inner peripheral surface of the valve box 21 at the position of the seat mounting portion 22.
3 is fixed. A plug 31 is provided in the resin injection hole 29.

When assembling the above-described valve box sheet, the seat 23 is moved along the axial direction of the flow path in the valve box so that the seat 23 is moved between the seat mounting portion 22 and the inner peripheral surface of the valve box 21. The valve case-side resin injection groove 28 and the seat-side resin injection groove 27
In this state, the curable resin 30 may be injected into the valve box-side resin injection groove 28 and the seat-side resin injection groove 27 through the resin injection hole 29, and the operation is easy.

Since the space between the seat 23 and the inner peripheral surface of the valve box 21 is securely sealed by the curable resin 30, the seat 2
3. High accuracy is not required for the inner peripheral surfaces of the seat mounting portion 22 and the valve box 21, and processing is easy.

Sheet 23 covered with rubber sheet portion 26
Can reliably seal the gap between the valve body and the valve body, and can be easily fitted and processed. After assembling, the resin 30 hardened inside the valve box-side resin injection groove 28 and the seat-side resin injection groove 27 engages with each groove 28, 27, so that the seat 2
3 does not move in the axial direction of the flow path, and the falling off of the sheet 23 is prevented.

[0020]

According to the present invention, opposed resin injection grooves are provided on the inner peripheral surface of the valve box and the seat fitted between the inner peripheral surface of the valve box and the seat mounting portion, and each resin injection groove is provided. Since the seat is fixed to the inner peripheral surface of the valve box by the resin injected into the groove, the seat can be easily and reliably installed.

Since the resin is securely sealed between the inner peripheral surface of the valve box and the seat, high precision is not required for the inner peripheral surface of the valve box, the seat mounting portion, and the seat. Processing is easier than.

Further, since the cured resin is engaged with each of the resin injection grooves, the sheet does not move in the axial direction of the flow path, thereby preventing the sheet from falling off.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state after assembly of a valve box sheet according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state before assembly of the valve box sheet.

FIG. 3 is a partially cutaway perspective view showing the entire configuration of a conventional eccentric structure valve provided with a valve box sheet.

FIG. 4 is a cross-sectional view showing the arrangement of the valve element when the flow path in the valve box is fully opened in the eccentric structure valve.

FIG. 5 is a cross-sectional view showing the arrangement of the valve body when the flow path in the valve box is fully closed in the eccentric structure valve.

FIG. 6 is a sectional view showing a conventional valve box sheet.

FIG. 7 is a cross-sectional view showing another conventional valve box sheet.

[Explanation of symbols]

 21 Valve case 22 Seat mounting part 23 Seat 24 Core part 26 Seat part 27 Seat side resin injection groove 28 Valve box side resin injection groove 29 Resin injection hole 30 Curable resin

Claims (2)

[Claims] 1. A valve box sheet provided at a position eccentric from a valve shaft crossing a flow path in a valve box and pressed against a peripheral portion of a valve body rotating around the axis of the valve shaft, the valve box sheet comprising: A surface of the valve mounting flow path is formed on a surface thereof and a seat mounting portion protruding in the radial direction is formed between the one side surface of the seat mounting portion facing the valve body and the inner peripheral surface of the valve housing. At the time of closing, an annular sheet is pressed into contact with the peripheral portion of the valve body, and resin injection grooves opposed to the inner peripheral surface of the valve box and the sheet are formed along the circumferential direction of the valve box. A resin injection hole communicating with the resin injection groove is provided in the valve box, and the sheet is filled in the valve box with the curable resin filled into the valve box-side resin injection groove and the seat-side resin injection groove through the resin injection hole. A valve box seat fixed to a peripheral surface. 2. The sheet comprises a metal core having a sheet-side resin injection groove formed therein, and an elastic material sheet covering the outer surface of the core and the periphery of the sheet-side resin injection groove. The valve box sheet according to claim 1, wherein: