JPH07167310A - Elastic metal seat - Google Patents

Abstract

PURPOSE:To enable exchange of an elastic metal seat and secure high sealability. CONSTITUTION:A cold setting rubber elastic seat 9 is circularly arranged adjacent to an inner periphery of an elastic metal seat 1 composed of a tubular circular body provided with a cut circle 1A. A circular retainer 6 is abutted against a valve body 3 and the elastic seat 9. Fastening members 8 each composed of a bolt are penetrated into through-holes 7 formed on the circular retainer 6 with equal intervals in a circumferential direction. Its male screw is inserted into a female screw 3A formed on the valve body 3 for fastening. The elastic metal seat 1 is detachably held by proper sandwiching force of the circular retainer 6 and the valve body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elastic metal sheet used for valves such as butterfly valves, ball valves and sluice valves (slide valves).

[0002]

2. Description of the Related Art For example, as an elastic metal sheet used in a conventional butterfly valve, the one shown in FIG. 3 is known. This kind of elastic metal sheet 1 has a missing circle portion 1
Welded 2 composed of a tubular annular body with A
Is attached to the outer circumference of the valve body 3. Therefore, when the valve body 3 is fully closed, the elastic metal sheet 1 is pressed against the mating seat portion to perform sealing. That is, when the valve body 3 is fully closed, the elastic metal sheet 1 is brought into pressure contact with the valve box seat 5 on the side of the valve box 4 and elastically deformed, and by this elastic deformation, the pressure contact force with the valve box seat 5 is increased and sealing is performed. It is like this.

However, since the elastic metal sheet 1 is attached to the outer periphery of the valve body 3 by the welding 2, even if the sealing property is deteriorated due to wear of the elastic metal sheet 1 with time, the elastic metal sheet 1 is removed from the valve body 3. It has the drawback that it cannot be removed and replaced.

FIG. 4 shows an elastic metal sheet 1 which has solved the above-mentioned inability to be replaced. The elastic metal sheet 1 is also composed of a tubular annular body having a cutout portion 1A, the annular retainer 6 is applied to the valve body 3, and a plurality of through holes 7 are formed through the annular retainer 6 at equal intervals in the circumferential direction. A fastening member 8 made of a bolt is inserted into each of the holes (only one through hole 7 is shown in FIG. 4), and the male screw portion thereof is screwed into the female screw portion 3A formed on the valve body 3 for fastening. As a result, the elastic metal sheet 1 is held by the valve body 3 and the annular retainer 6 by an appropriate clamping force, and the elastic metal sheet 1 and the valve body 3 and the elastic metal sheet 1 and the annular retainer 6 and the valve body 3 are held. A seal ring (O ring) O, O, O is provided between the ring retainer 6 and the annular retainer 6, respectively.

With such a structure, the elastic metal sheet 1 is provided on the valve box seat 5 on the valve box 4 side when the valve body 3 is fully closed.
When the elastic metal sheet 1 deteriorates in sealing performance due to the wear of the elastic metal sheet 1 over time, the elastic metal sheet 1 can be sealed by being elastically deformed by being pressed into contact with the valve box seat 5 by this elastic deformation. Cancel the fastening by 8,
The elastic metal sheet 1 can be easily replaced by removing the annular retainer 6. However, since the elastic metal sheet 1 is held by being sandwiched between the valve body 3 and the annular retainer 6, as compared with the structure in which the elastic metal sheet 1 is attached to the valve body 3 by welding 2 as shown in FIG. The amount of elastic deformation is restricted. As a result, it becomes difficult to press the elastic metal sheet 1 into pressure contact with the valve box seat 5 due to high elasticity, and the sealing property is slightly deteriorated. Moreover, there is a risk that leakage will occur at the seal portion due to the seal rings O, O, O.

[0006]

The problem to be solved is that in the structure in which the elastic metal sheet is attached by welding, it is impossible to remove and replace the elastic metal sheet even if the sealing property deteriorates due to wear over time. If the elastic metal sheet can be replaced, the amount of elastic deformation is limited, so that it is difficult to press-contact due to high elasticity, and the sealing property is slightly inferior, and leakage may occur at the seal portion due to the seal ring. This is the point of having this.

[0007]

SUMMARY OF THE INVENTION The present invention provides an annular elastic metal sheet which is attached to the outer surface of a valve body or the inner surface of a valve box and presses against a mating seat portion to seal.
The elastic metal sheet is constituted by a tubular annular body having a cutout portion, and a rubber elastic seat is annularly formed adjacent to a direction in which a pressing force is applied during press contact with the mating side. The elastic metal sheet and the rubber elastic seat are detachably held by sandwiching the retainer with the outer surface of the valve body or the inner surface of the valve box. And achieved the purpose of ensuring high sealing performance.

[0008]

According to the present invention, when the elastic metal sheet is abraded with time and its sealing property is deteriorated, the elastic metal sheet can be easily replaced by removing the retainer. Moreover, since the elastic deformation of the rubber elastic seat is added to the elastic deformation of the elastic metal sheet, the restriction of the elastic deformation amount is relaxed, and the elastic metal sheet is highly elastically pressed against the other side to achieve high sealing performance. Can be secured. In addition, since the rubber elastic seat closely contacts the elastic metal sheet,
High sealing performance can be ensured also between the elastic metal sheet and the rubber elastic seat.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged sectional view partially showing a state in which an elastic metal sheet is attached to the outer circumference of a valve body of a butterfly valve. It should be noted that the same or corresponding portions as those of the conventional example shown in FIGS. In FIG. 1, the elastic metal sheet 1 is configured by a tubular annular body having a circular cross section with a cutout portion 1A and a flat portion 1B provided on the outer peripheral portion. An elastic seat 9 made of a room temperature curable rubber is arranged in an annular shape adjacent to the inner circumference of the elastic metal sheet 1. That is, the outer peripheral surface of the elastic metal sheet 1 is arranged such that the outer peripheral surface of the inner peripheral half of the elastic seat 9 is in uniform contact with the outer peripheral surface of the elastic seat 9 made of rubber.

The elastic metal sheet 1 and the elastic seat 9 made of a room temperature curable rubber put the annular retainer 6 against the valve body 3 and form a plurality of through holes 7 formed in the annular retainer 6 at equal intervals in the circumferential direction (however, , Only one through hole 7 is shown in FIG. 1)
A fastening member 8 made of a bolt is inserted into each of the above, and its male screw portion is screwed into a female screw portion 3A formed in the valve body 3 to be fastened, whereby the valve body 3 is appropriately clamped.
And an annular retainer 6. In particular,
The elastic metal sheet 1 is held between the valve body 3 and the annular retainer 6 in a state where a part of the outer peripheral portion of the elastic metal sheet 1 is exposed.

With this structure, when the valve body 3 is fully closed, the flat portion 1B of the elastic metal sheet 1 is pressed against the valve box seat 5 on the valve box 4 side to be elastically deformed, and at the same time, the room temperature curable rubber is used. The made elastic seat 9 also elastically deforms. That is, when the elastic metal sheet 1 is elastically deformed, the elastic seat 9 made of a room temperature curable rubber is used.
Since the elastic deformation of 1 is taken into consideration, the restriction of the elastic deformation amount caused by the elastic metal sheet 1 being sandwiched between the valve body 3 and the annular retainer 6 and held is relaxed. This allows
The elastic metal sheet 1 can be pressed against the valve box sheet 5 with high elasticity to ensure high sealing performance. Further, since the elastic seat 9 made of the room temperature curable rubber is closely attached to the elastic metal sheet 1, a high sealing property is secured between the elastic metal sheet 1 and the elastic seat 9 made of the room temperature curable rubber. It is possible to surely prevent the leakage of water.

On the other hand, when the sealability of the elastic metal sheet 1 deteriorates with time, the elastic metal sheet 1 can be easily replaced by releasing the fastening by the fastening member 8 and removing the annular retainer 6. It is possible. Of course, the elastic seat 9 made of a room temperature curable rubber can be replaced if necessary.

FIG. 2 shows a modification of the present invention. Note that FIG.
The same or corresponding parts as in the embodiment of the present invention are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 2, an annular rubber tube 10 is arranged adjacent to the inner peripheral side of the elastic seat 9 made of a room temperature curable rubber. By forming the annular cavity 11 in this manner, the elastic metal sheet 1 can be pressed against the valve box seat 5 with higher elasticity than that of the embodiment of FIG. 1 to ensure high sealing performance. Of course, the elastic metal sheet 1, the elastic seat 9 made of a room temperature curable rubber, and the annular rubber tube 1
Exchange of 0 is possible.

In the above-described embodiment, the elastic seat 9 is formed by arranging the room temperature curable rubber in an annular shape, but the elastic seat 9 is formed by the rubber lining layer. May be. Further, although the description has been given of the configuration in which the butterfly valve is attached to the outer circumference of the valve body 3, the butterfly valve may be attached to the inner circumference of the valve casing 4. In this case, an elastic seat 9 made of a room temperature curable rubber may be arranged adjacent to the outer periphery of the elastic metal sheet 1, or the elastic seat 9 may be formed by a rubber lining layer. Further, the present invention is not limited to butterfly valves, but can be used for valves such as ball valves or gate valves (slide valves).

[0015]

As described above, according to the present invention, when the elastic metal sheet is abraded with time and its sealing property is deteriorated, the elastic metal sheet can be easily replaced, and the elastic metal sheet is elastically deformed to be made of rubber. Since the elastic deformation of the elastic seat is taken into consideration, the restriction of the elastic deformation amount is relaxed, and therefore the elastic metal sheet can be pressed against the other side with high elasticity to ensure high sealing performance. Further, since the rubber elastic seat closely contacts the elastic metal sheet, a high sealing property can be secured between the elastic metal sheet and the rubber elastic seat, and leakage from this can be reliably prevented. .

[Brief description of drawings]

FIG. 1 is an enlarged sectional view partially showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view partially showing a modified example of the present invention.

FIG. 3 is an enlarged sectional view partially showing a conventional example.

FIG. 4 is an enlarged sectional view partially showing another conventional example.

[Explanation of symbols]

 1 Elastic Metal Sheet 1A Missing Circle of Elastic Metal Sheet 3 Valve Body 4 Valve Box 5 Valve Box Seat 6 Annular Retainer 9 Rubber Elastic Seat

Claims (1)

[Claims] 1. An annular elastic metal sheet, which is attached to the outer surface of a valve body or the inner surface of a valve box and presses against a mating seat portion for sealing, wherein the elastic metal sheet is provided with a tubular shape having a cutout portion. The elastic metal seat and the elastic seat made of rubber are arranged annularly adjacent to each other in the direction in which the pressing force at the time of pressure contact with the other side is loaded. An elastic metal sheet, wherein the elastic metal sheet is detachably held by sandwiching the retainer with the outer surface of the valve body or the inner surface of the valve box.