JPH07117172B2 - Manufacturing method of butterfly valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve for connecting and disconnecting a pipeline, and more particularly to a novel method for manufacturing a butterfly valve.

(Prior Art) Conventionally, a disc-shaped valve body is rotatably arranged from the outside in a cylindrical body, and the pipe line is interrupted by contact and separation between the outer peripheral edge of the valve body and the inner peripheral surface of the body. A butterfly valve adapted to perform the above is known.

Since the main body of such a butterfly valve is generally manufactured by forging, it is heavy and inconvenient to handle, and it is expensive due to many machining such as cutting and drilling.
Also, because the main body or valve body is fitted with an elastic sealing material called a seat ring or a rubber sheet, the connection with piping is restricted and a connection method such as a clamp joint, welding or flare may be adopted. It was extremely difficult.

(Problems to be Solved by the Invention) The present invention has been made to solve the drawbacks found in conventional butterfly valves, is lightweight and can be manufactured at low cost, and the connection method with piping can be freely changed. It is intended to provide a possible method of manufacturing a butterfly valve.

(Means for Solving the Problems) In order to solve the above-mentioned problems, a means adopted by the present invention is to use a pipe material having a predetermined length and an inner diameter at a diametrically opposed position at a diametrically opposed position at a substantially central portion thereof. To form a valve stem support (7) (8), and the closed end of one valve support (7) is opened as a penetration (10) and both ends are formed. After forming the pipe connection parts (9) and (9 ') into the main body (1) and inserting the valve rod (4) into the other valve shaft support portion (8), the valve rod is placed at the diametrically opposed position. A rubber sheet (6) having an insertion hole is inserted into the valve rod (4) and arranged in the main body (1), and then the rubber sheet (6) is received in the recesses (16) and (16 ') to form a valve. Two valve plates (15) (15 ') having symmetrical shapes with respect to a plane passing through the center of the rod
Are integrally joined to form a valve body (2), and then the drive side valve stem (3) inserted from the outside into one valve stem support (7) is inserted into the valve body (2) and rotated. It is characterized by being directly connected to the direction.

(Operation) First, the other valve rod (4) is rotatably supported in the main body (1) made of a pipe material, and the rubber sheet (6) is inserted into the valve rod (4) and arranged in the main body (1). Then, the valve plates (15) and (15 ') are integrally formed while receiving the rubber sheets (6) in the recesses (16) and (16') of the two symmetrical valve plates (15) and (15 '). Since the valve body (2) is joined to the valve plate (2) and the drive side valve rod (3) is inserted into the valve plate (2) and connected in the rotational direction to form a butterfly valve, pipe material is used. It is easy to assemble the valve rod, the rubber sheet and the valve body into the formed body.

(Effect of the invention) According to the present invention, since the main body is lightweight, the handling becomes convenient, and the transportation cost and the labor cost can be reduced.
By lowering manufacturing costs, the competitiveness of products can be improved.
Further, since the shape can be easily changed corresponding to the structure for connection with the pipe, there is no restriction on the connection with the pipe, and the application of the butterfly valve can be expanded. (Embodiment) A preferred embodiment of the present invention will be described below with reference to the drawings. In the figure, (1) is a butterfly valve main body, (2) is a disc-shaped valve body rotatably mounted in the main body (1), and the valve body (2) is a valve at a symmetrical position. The rods (3) and (4) are rotatably supported by the main body (1). One valve rod (3) penetrates the valve body (1) and extends outward, and a desired valve drive means (5) is attached to the end thereof.

The valve body (1) is made of a cylindrical pipe material having a desired length, and the valve rod shaft support portion (7) is located at a substantially symmetrical position in the radial direction in the central portion.
(8) is formed, and a pipe connecting portion (9) is formed at the longitudinal end.
(9 ') is formed. One valve stem supporting portion (7) has a short tube shape capable of penetrating the valve stem (3) on the driving side, projects radially outward from the outer peripheral surface of the main body (1), and penetrates the inside and the outside. It has a hole (10). Further, the other valve stem supporting portion (8) has a cylindrical cap shape with its outer end closed, and similarly protrudes radially outward from the outer peripheral surface of the main body (1) to form a blind hole. A valve rod (4) on the floating side is rotatably supported on (11).

The pipe connecting part (9) is composed of a clamp groove which surrounds the outer peripheral surface of the main body (1) in an annular shape in proximity to the end of the main body (1),
As shown in FIG. 6, a clamp joint (14) is fitted between the clamp groove (13) on the pipe (12) side to connect the main body (1) and the pipe (12). Further, the second pipe connecting portion (9 ') is a flare in which the end portion of the main body (1) is expanded outward in the shape of a trumpet, and is flare-connected to the pipe. In the drawing, the clamp groove (9) and flare (9 ')
Are formed on both ends of one main body (1), but this is merely for convenience of description, and actually, either one of the connection structures is formed on both ends of the main body (1). Is.

The main body (1) is manufactured by bulging the pipe material in the radial direction by bulging or the like. The shape and structure of the main body (1) of the present invention are most suitable for producing from a pipe material by bulging. Bulge processing is a processing method in which a pressure is applied to the inside of a material to bulge and form a part of the material, and there are mechanical energy, compressed air, explosive energy, electric energy, etc. as a pressure generation source. The method of using rubber is most suitable for the molding of (1). That is, a pipe material having a desired length and a wall thickness, which is a raw material, is radially bulged in the split mold to be molded into the above shape.
The through hole (10) of the drive side valve stem support (7) is formed by punching with a press or a drill.

The valve body (2) is formed by integrally joining two valve plates (15) (15 ') having symmetrical shapes with respect to a plane passing through the centers of the valve rods (3) (4). The recesses (16) (1) for receiving the rubber sheet (6) are provided on the outer peripheral portions of the valve plates (15) (15 ').
6 ') is formed, and the recesses (16) (16') become a space for receiving and sandwiching the rubber sheet (6) when the two valve plates (15) (15 ') are joined to each other. The tip of 6) projects outward from the outer circumference of the valve body (2) and can come into contact with and separate from the inner circumferential surface of the main body (1).

(17) is a valve shaft cylinder that pivotally supports the drive side valve rod (3),
The lower flange is fitted to the outer circumference of the valve stem support (7) and welded for connection.

The valve is assembled by first pivotally supporting the other valve rod (4) in the main body (1) formed of a pipe material, and inserting the rubber sheet (6) into the main body (1). And then the two recesses (16) (1) of the two valve plates (15) (15 ') of symmetrical shape.
While receiving the rubber sheet (6) in 6 '), the valve plate (15) (1
5 ') are integrally joined by means such as welding to form the valve body (2), and the drive side valve rod (3) is inserted into the valve plate (2) and connected in the rotational direction to form a butterfly valve. Form.

[Brief description of drawings]

1 is a longitudinal sectional view, FIG. 2 is a sectional perspective view of a main body, FIG. 3 is a perspective view of a valve body, FIG. 4 is a sectional perspective view of a valve body, and FIG. 5 is an exploded perspective view of a valve body. FIG. 6 is a vertical sectional view showing a connection state with a pipe. (1) …… Main body, (2) …… Valve disc (3) (4) …… Valve rod, (5) …… Valve driving means (6) …… Rubber sheet, (7) (8) …… Valve Rod shaft support (9) (9 ') …… Piping connection, (10) …… Penetration (11) …… Blank shaft hole, (12) …… Piping (13) …… Clamp groove, (14 ) …… Clamp joint (15) (15 ′) …… Valve plate, (16) (16 ′) …… Concave (17) …… Valve shaft cylinder

Claims (1)

[Claims] 1. A pipe material having a predetermined length and an inner diameter is bulged radially outward in a diametrically opposed position at a substantially central portion thereof to form a valve shaft support portion (7) (8), The closed end of one valve stem support portion (7) is opened to form a through portion (10), and pipe connecting portions (9) and (9 ') are provided at both ends.
After forming the main body (1) and inserting the valve rod (4) into the other valve shaft support portion (8), a rubber sheet (6) having valve rod insertion holes formed at diametrically opposite positions is formed. The valve rod (4)
It is placed in the body (1) while being inserted into the
The valve body (2) is formed by integrally joining two valve plates (15) (15 ') having a symmetrical shape with respect to a plane passing through the center of the valve rod while receiving the rubber sheet (6) in the (16'). ) Is formed,
Next, a butterfly valve, characterized in that a drive side valve rod (3) inserted into one valve rod shaft support portion (7) from the outside is inserted into the valve body (2) and directly connected in the rotational direction.