JPH08240272A - Butterfly valve - Google Patents

Abstract

PURPOSE: To reduce weight and shorten a manufacture period by forming a butterfly valve out of a hollow cylindrical metal tube valve body, a lining layer of elastomer material on the internal surface thereof, and a disc type valve in the body, and providing a valve seat on the internal surface of the lining layer for the external surface of the valve to contact and depart therefrom. CONSTITUTION: This valve is formed out of a valve body 1 of hollow cylindrical metal tube, a lining layer 2 of elastomer material to conceal a part of the internal surface thereof and disc type valve 4 rotatably supported in the body 1. Furthermore, shaft holes 9 are formed through the body 1 at opposite positions in the same radial direction, and valve rod guides 7 and 8 are coupled to the hole 9. Also, the guides 7 and 8 are extended externally from the body 1 and fixed thereto. Valve rods 5 and 6 are laid through the guides 8 and 8, and the rod 5 is extended from the guide 7 for connection to a drive means. Also, a circumferentially extended valve seat 3 is formed on the internal surface of the layer 2 at a center position for contact with and departure from the peripheral edge of a valve 4 for open/close operation. As a result, weight can be substantially reduced. Also, the metal tube is available on the market. Thus, a manufacture period and cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve having a valve body formed of a hollow cylindrical metal pipe such as a steel pipe.

[0002]

2. Description of the Related Art Conventionally, the valve body of a butterfly valve is most commonly formed by casting and has a flange type, a lug type, a wafer type structure or the like depending on the connection form with a piping pipe. However, since it is heavy and inconvenient to handle, it requires bolts and nuts for connecting the piping pipe to the flange, and the piping pipe and the butterfly valve body must be accurately centered.
There was a problem that the workability of piping was poor. Further, casting is not a preferable processing means because it has many problems in terms of workability and working environment.

Further, since the cast product has a heavy weight, it is difficult to line the seat ring arranged in the valve body with a mold, and it is generally mounted by a fitting method. However, in the fitting method,
Since there is a risk of the seat ring falling off, it could not be used under fluid conditions such as high flow velocity, high differential pressure, high temperature, or there was a risk of rusting or corrosion.

In particular, in the case of a small-diameter valve which has been widely used in recent years to improve the efficiency of fluid transportation, when the seat ring is fitted into the valve, there is a high risk of the seat ring falling off and it cannot be practically adopted. There was a problem.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the problems found in the butterfly valve provided by the conventional casting process, in which the valve main body is a hollow cylindrical metal pipe body such as a steel pipe. Is to be formed in.

[0006]

Means for Solving the Problems In order to solve the above-mentioned problems, the means adopted by the present invention covers a valve body made of a hollow cylindrical metal tube and a part of the inner peripheral surface of the valve body. A lining layer made of an elastomeric material and a disc-shaped valve body rotatably supported in the valve body. A shaft hole is formed in the valve body at opposite positions in the same diameter direction. While connecting the rod guides, they are extended to the outside of the valve main body and fixed to the valve main body, the valve rod is axially mounted on the valve rod guide, and one valve rod is extended outward from the valve rod guide to drive means. And a valve seat is formed on the inner peripheral surface of the lining layer so that the outer peripheral surface of the valve element comes into contact with and separates from the inner peripheral surface of the lining layer.

A short tubular valve rod guide is inserted into the shaft hole from the inside of the valve body and fixed to the valve body while extending outward from the valve body,
A pipe-shaped tubular gland member is inserted and fixed to the valve rod guide from the outside of the valve body, and a valve rod that axially supports the valve body is axially mounted on the valve rod guide and the tubular gland member, and one valve rod is tubular gland. It is characterized in that it extends outward from the member and can be connected to the drive means.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described in detail below with reference to the drawings. In the figure
(1) is a valve body, which is formed by cutting a steel pipe into a predetermined length. Steel pipes used for various pipes, for example, for water supply, water transportation, heating furnaces, etc., have a uniform outer diameter standard regardless of the difference in operating temperature and material. Therefore, by using such a steel pipe for piping as a valve body, as a result of matching the outer diameter dimensions in the connection between the piping and the butterfly valve, centering becomes extremely simple, and
It is not necessary to use bolt tightening means as in the past, and connection can be made by a band method or a joint method.

A part of the inner peripheral surface of the valve body (1) is covered with a lining layer (2) made of an elastomer material such as rubber.
A valve seat (3) extending in the circumferential direction is formed at the center of the inner peripheral surface of the lining layer (2), and the outer peripheral edge of the disc-shaped valve body (4) is brought into contact with and separated from the valve seat (3) to open and close the valve. Bring

The valve body (4) is formed by means known in the art, such as casting,
It has a disk-shaped structure formed by processing means such as forging, and is rotatably supported on the valve body (1) by valve rods (5) and (6) that extend in opposite directions in the same diameter direction. To be done. One valve rod (5)
Extends out of the valve body (1) and is connected to a desired driving means (not shown) to transmit a rotational force to the valve body (4). Disc
The (4) and the two valve rods (5) and (6) are connected to each other by a square or hexagonal corner connection, a key connection, or a suitable connecting means such as a taper bolt / nut. (7) and (8) are valve rods
(5) A corrosion-resistant valve rod guide for axially inserting (6), which is inserted from the inside of the valve body (1) into a shaft hole (9) formed at a diametrically opposed position of the valve body (1). The flange portions (7a) and (8a) are fitted and held by abuttingly locking the inner peripheral surface of the valve body (1), and are fixed by means such as welding. Tubular gland members (10) and (11) are externally fitted to the valve stem guides (7) and (8), respectively.
One end of each of (0) and (11) is fixed to the outer peripheral surface of the valve body (1) by means such as welding.

The tubular gland member (10) for axially inserting the valve rod (5) on the drive side is opened at the outer end, and the valve rod (5) extends outward for connection with the drive means. Is allowed. The other tubular gland member (11) has its outer end sealed with a lid plate (12) via a sealing material (13), and the other valve rod (6) is
It terminates in this tubular gland member (11). A valve stem guide (14) is fitted to the outer end of the driving side tubular gland member (10) to ensure the stability and smooth rotation of the valve stem (5). A sealing means (15) such as an O-ring (15) is applied to seal between the valve stem (5) and the valve stem guide (14).

A method for forming the lining layer (2) having the valve seat (3) on a part of the inner peripheral surface of the valve body (1) will be described with reference to FIG. The lining layer (2) is a valve body in which an elastomer material such as unvulcanized rubber is press-fitted using a mold and vulcanized.
It is formed by baking on the inner peripheral surface of (1).

The molding die is composed of a first die and a second die.
(16, 17), the first mold (16) is a cylindrical body (19) having a valve seat molding portion (18) on the outer peripheral surface of the upper part, and a cross section at the lower part of the cylindrical body (19).

[Outside 1] The valve seat forming part (18) and the cylindrical body (19) have a predetermined shape and a thick wall seat (3). ) And lining layer on the inner surface of the valve body
Form (2). A jig insertion hole (22) extending in the diametrical direction is formed through the valve seat molding portion (18). Also, flange
The inner diameter of (21) is substantially the same as the outer diameter of the valve body (1), and there is no risk of rattling of the mold when the first mold (16) is set. As shown in the figure, when inserting the jig (23) into the jig insertion hole (22) through the valve rod guides (7) and (8),
A predetermined space is formed between the end (1 ') of the valve body (1) and the bottom surface of the groove (20). The second mold (17) is the first mold described above.
A cylindrical body (24) stacked on (16), and the cylindrical body (24)
Cross section at the top of

[Outside 2] It is provided with a flange portion (26) which is continuous through the groove portion (25). The cylindrical body (24), the groove portion (25) and the flange portion (26) have the same functions as the cylindrical body (19), the groove portion (20) and the flange portion (21) of the first mold, The axial length and outer diameter of the body (1) are restricted.

On the outer peripheral surface of the lower part of the second mold (17), a lining layer molding part (27) continuous with the valve seat molding part (18) of the first mold (16) is formed. The first and second molds (16) (17) are
It is joined so as to form a parting line (28) at a position outside the valve seat portion.

While inserting the jig (23) from the valve rod guides (7) and (8) into the jig insertion hole (19), as shown in FIG. 2, the first and second molds (16) and (17). When sequentially stacking and setting them on the valve body (1), the first and second molds (16) (17) and the valve body (1) are the flange portions (21) (26) and the valve body ( Due to the insertion relationship with the outer peripheral surface of 1), the positions are accurately set and combined, and the space is provided between the first and second molds (16) (17) and the inner peripheral surface of the valve body (1). The required spacing for molding the lining layer is formed.

In the actual molding of the lining layer (2), first, the first mold (16) is set on the valve body (1), and then the unvulcanized elastomer material is press-fitted into the lining layer molding space. After that, the second mold (17) is set and heated so that vulcanization is performed. After the vulcanization is completed, the second mold (17)
The upper mold, pull out the jig (23), and remove the first mold (16).
The valve body (1) on which the lining layer (2) is formed is pulled out from above. After that, since the extra elastomer at the time of press fitting protrudes into the gap between the valve body (1) and the molds (16) and (17), this is cut off to obtain a finished product.

According to the present invention, since the valve body is formed of a hollow cylindrical metal tube body such as a steel tube, a great reduction in weight can be achieved, and since the tube body can be a commercially available product, the manufacturing period can be shortened. In addition to cost reduction,
Various problems such as in casting can be solved.

Further, since the lining layer including the valve seat can be baked and attached to the inner peripheral surface and the end surface of the valve main body by the vulcanizing means using the mold, the adhesion of the lining layer is good and a wide range of fluid conditions can be obtained. It is possible to provide a butterfly valve that can be applied to a wide range of applications.

Since the lining layer is molded by a mold set on the basis of the outer diameter of the valve body, the inner diameter of the valve seat is stable, and the lining layer becomes a seat ring that improves the sealing performance when fully closed. Can be installed, and high quality and high performance products can be obtained.

Since the valve body has the same outer diameter as the pipe outer diameter of the pipe line, it is possible to use a simple connecting means such as a band or a joint, which improves the workability of the pipe and saves the piping cost. Can be planned.

Since the lining layer including the valve seat partially covers the inner peripheral surface of the valve body, the economical efficiency is particularly improved when the use of an expensive elastomer material is required. You can

[0022]

According to the present invention, since the valve main body is formed of a hollow cylindrical metal pipe body such as a steel pipe, a significant reduction in weight can be achieved, and since the pipe body can be a commercially available product, it can be manufactured in a manufacturing period. Can be shortened and cost can be reduced, and various problems such as casting can be solved.

Further, since the valve body has the same outer diameter as the pipe outer diameter of the pipe pipeline, a simple connecting means such as a band or a joint can be used, so that the workability of the pipe is improved and the pipe cost is reduced. You can save money.

Further, since the lining layer including the valve seat partially covers the inner peripheral surface of the valve body, the economical efficiency is improved especially when the use of an expensive elastomer material is required. You can

[Brief description of drawings]

[Fig. 1] Vertical sectional view

FIG. 2 is a vertical sectional view showing a set state of a mold and a valve body.

[Explanation of symbols]

 (1) Valve body (2) Lining layer (3) Valve seat (4) Valve body (5) Valve rod (6) Valve rod (7) Valve rod guide (8) Valve rod guide (9) Shaft hole (10) ) Tubular gland member (11) Tubular gland member (12) Lid body (13) Seal material (14) Valve rod guide (15) Sealing means (16) First mold (17) Second mold (18) Valve seat Molding part (19) Cylindrical body (20) Groove part (21) Flange part (22) Jig insertion hole (23) Jig (24) Cylindrical body (25) Groove part (26) Flange part (27) Lining layer molding part ( 28) Parting line

Claims (2)

[Claims] 1. A valve body made of a hollow cylindrical metal tube, a lining layer made of an elastomer material covering a part of the inner peripheral surface of the valve body, and rotatably supported in the valve body. It is composed of a disc-shaped valve body, and has a shaft hole formed in the valve body at opposite positions in the same diametrical direction.The shaft hole is connected to the valve rod guide and extended outwardly of the valve body to be fixed to the valve body. A valve stem is axially mounted on the valve stem guide, and one valve stem extends outward from the valve stem guide to be connectable to a drive means, and an inner peripheral surface of the lining layer forms an outer peripheral surface of the valve body. A butterfly valve characterized in that it has a valve seat that contacts and separates. 2. A short tubular valve rod guide is inserted into the shaft hole from the inside of the valve body, and is extended to the outside of the valve body and fixed to the valve body.
A pipe-shaped tubular gland member is inserted and fixed to the valve rod guide from the outside of the valve body, and a valve rod that axially supports the valve body is axially mounted on the valve rod guide and the tubular gland member, and one valve rod is tubular gland. The butterfly valve according to claim 1, wherein the butterfly valve extends outwardly from the member and can be connected to the drive means.