JPH083777Y2 - Butterfly valve - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is capable of easily disassembling and assembling for periodical cleaning, and also stabilizes a rubber valve seat having a relatively low physical property value for a long period of time. The present invention relates to a new improvement of a butterfly valve that can be used as described above.

(Prior Art) A butterfly valve applied to a pipeline that conveys medicines and foods and drinks prevents the medicines and foods and drinks that are controlled fluids from adhering to become unsanitary and putrefaction. Therefore, it is legally obligatory to disassemble and wash regularly. The rubber valve seat, which is interposed between the butterfly valve body and the valve body, must not be made of a material that causes an odor to the fluid to be handled or changes the taste. It is required to have oil resistance. As a material satisfying such requirements, for example, fluororubber is used for medicines and silicone rubber is used for foods and drinks. These rubber materials have the same tensile strength and tear strength. It has low physical properties and the material cost per unit volume is extremely high. For example, silicone rubber is more
Tensile strength and tear strength are as low as about 1/3, and the cost is 10 times. Therefore, it is possible to stably use materials with low physical properties and high costs for a long period of time.
Moreover, it is desired to have a structure that can reduce the cost as much as possible.

Conventionally, butterfly valves for application to medicines and foods and drinks have been disclosed in, for example, Japanese Utility Model Publication No. 59-11228.
This butterfly valve is an open / close clamp that tightens both flanges of the valve body in the axial direction via a rubber valve seat to fasten them, and by opening and closing the clamp, the butterfly valve can be easily disassembled and assembled. is there.

However, in such a known butterfly valve, the rubber valve seat that is interposed in the valve body that is tightened by the clamp has a rectangular cross section, and is partially pulled by sliding contact with the valve body when opening and closing the valve. It has a drawback that cracks and breakage are likely to occur by repeatedly receiving and compression, and it is easily drawn inward by the fluid pressure flowing in the valve body, so the width of the rubber valve seat must be increased, It was not possible to reduce the material cost.

(Problems to be Solved by the Invention) This invention makes it possible to stably use a rubber valve seat with low physical properties and high material cost for a long period of time, and to reduce the material cost. It is intended to provide a structure of a butterfly valve that can be easily disassembled and assembled for regular cleaning and can be easily centered during assembly.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention is divided into two in the valve axis direction, and when they are joined, a fitting groove (2) having a trapezoidal cross section is formed on the inner peripheral surface. ) Forming a pair of valve bodies (1a)
(1b), a rubber valve seat (3) having a trapezoidal cross section fitted in the fitting groove (2), a driving side valve rod (5) and a floating side valve rod (6) at diametrically opposed positions. A fixed disc-shaped valve body (4) and a pair of ring-shaped outer ring members which are split into two in a direction orthogonal to the valve axis direction and which are fitted to the outer peripheral surfaces of the valve bodies (1a) and (1b). Consisting of (7a) and (7b), valve body (1a)
(1b) is joined by the joining surface (10) having a cross section, and the valve bodies (1a) (1b) and the outer ring members (7a) (7b) are fitted by the fitting faces having the cross section, and the outer ring member ( 7a) (7b)
It is characterized in that it is assembled by tightening with a tightening bolt.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. The butterfly valve according to the present invention comprises a pair of main bodies (1a) and (1b), which are divided into left and right by a vertical surface along the valve axis and are joined together to join the main bodies (1a) and (1b). A rubber valve seat (3) fitted in a fitting groove (2) having a trapezoidal cross section, a disc-shaped valve body (4), and a position where the valve body (4) opposes in the valve axial direction. Is fixed vertically to the drive side valve rod (5), which extends outward in the valve axis direction, the floating side valve rod (6), and is vertically divided along a horizontal plane orthogonal to the center of the valve shaft. When joined, it comprises a pair of outer ring members (7a) (7b) that can join the above-mentioned bodies (1a) (1b) together to assemble one valve body.

As shown in Fig. 5, the valve bodies (1a) and (1b) consist of a cylindrical ring body, and are divided into left and right (in Fig. 3) by a vertical surface along the valve axis, and when joined, the inner circumference An annular recess (2a) that becomes a fitting groove (2) with a trapezoidal cross section in the center of the surface
(2b) is formed. Further, semi-circular hole portions (9a) (9b) which become circular valve shaft holes (9) when similarly joined are formed at diametrically opposite positions. The joint surface (10) of the valve bodies (1a) and (1b) is a joint surface having a cross-sectional shape as shown in FIG. 6 to prevent displacement during joint in the vertical and horizontal directions in FIG. It has a structure that allows easy and reliable centering of the valve body.

The rubber valve seat (3) is fitted into the fitting groove (2) created by joining the pair of valve bodies (1a) and (1b) while maintaining proper compression. The rubber valve seat (3) has a trapezoidal cross section,
The inner surface of the valve stem (5) is as shown in Figs.
It is formed to have the same minimum width as the width of the boss portion of the valve body (4) which comes in contact with and separates from the periphery of (6), and the material amount required for the rubber valve seat (3) is minimized to reduce the material cost. ing.
Further, the rubber valve seat (3) and the valve body (4) which comes in contact with and separates from the inner peripheral surface of the rubber valve seat (3).
The outer peripheral surface of is made up of a part of a spherical surface with the same center, and is designed to allow 360 ° rotation of the valve body without excessive wear of the rubber valve seat. The life of the valve seat can be dramatically extended. The center of the inner peripheral surface of the rubber valve seat (3) preferably has a middle-high structure composed of an arcuate projecting surface slightly projecting inward.
Improves the elasticity of the rubber valve seat and enhances the sealing effect. Seventh
As shown in the figure, the inner diameter R ₁ of the rubber valve seat (3) has a size slightly smaller than the outer diameter of the valve body (4), and the difference in size serves as a compression margin to exert the primary sealing function. Furthermore,
The inner peripheral surface of the valve shaft hole (11) through which the valve rod penetrates is formed into an arcuate surface having a radius R ₂ to create a compression margin for the valve rod and improve the secondary sealing effect. Further, the rubber valve seat (3) is provided with R ₃ and R ₄ in FIG. 7 at the outer peripheral corners of the rubber valve seat (3) in order to eliminate the presence of a thin portion, a variable thickness portion or an acute angle portion. The indicated roundness prevents the rubber valve seat from cracking.

The drive side valve rod (5) to which the valve body (4) is fixed is attached to the rubber valve seat (3), the valve shaft holes (9) and (11) of the valve bodies (1a) and (1b), and the outer ring member (7a). The valve shaft cylinder (12) provided integrally extends and extends outward, and an actuator (not shown) can be appropriately applied to the outer end. As shown in FIG. 2, a slit (13) is formed on the outer end surface of the drive side valve rod (5) so as to coincide with the direction of the valve body (4), so that the direction of the valve body (4) can be maintained even when pipes are connected. Can be confirmed. At the diametrically opposed position to the drive side valve rod (5), the floating side valve rod (6) fixed to the valve body (4) is located inside the valve body (1a) (1b) as shown in FIG. It is terminated.

The outer ring members (7a) (7b) are ring-shaped members that are vertically divided along a horizontal plane orthogonal to the center of the valve shaft,
Cross-sectional mating surface (14) on the outer peripheral surface of the valve body (1a) (1b)
And the valve bodies (1a) and (1b) are integrally joined. Inside the fitting surface between the fitted valve bodies (1a) (1b) and the outer ring members (7a) (7b), there is a slight gap (1) as shown in FIG. The fitted outer ring members (7a) and (7b) are fixed by tightening the flange portions (15a) and (15b) formed at both ends of the joint surface with tightening bolts (8).

A valve shaft cylinder (12) is integrally formed on the upper outer ring member (7a) to allow the drive-side valve rod (5) to penetrate therethrough as described above, and also to prevent the valve shaft cylinder (12) from outside. At the end, a mounting flange (16) that forms a pedestal for mounting the actuator is formed.

An annular groove (17) having a cross section is formed at the outer ends of the valve bodies (1a) and (1b), and an O-ring (18) is inserted into the annular groove (17) for flange connection at the time of pipe connection. For gasket.

When assembling, first, the valve body (4) is incorporated into the rubber valve seat (3) while inserting the valve rods (5) and (6) fixed to the valve body (4) into the valve shaft hole (11). Next, while incorporating the rubber valve seat (3) in the fitting groove (2), the valve body (1a) (1b)
The outer ring member (7a) (7b) by joining the valve body (1a) (1b)
Fit to the outer peripheral surface of. Then, the outer ring members (7a) and (7b) are tightened with the tightening bolts (8) to integrate the whole. After assembly, as shown in Figures 9 and 10, the piping pipe (19)
Assemble a butterfly valve between the end faces of and tighten it between the joint flanges (20) to secure. By this tightening,
The O-ring (18) is compressed and seals between the piping pipe (19) and the valve bodies (1a) (1b). After connecting the pipes, an appropriate actuator is applied while confirming the direction of the valve body (4) with the slit (13) at the outer end of the drive side valve rod (5).

(Operation) A pair of valve bodies (1a) (1b) divided into two in the valve axis direction
Are joined and fixed by a pair of outer ring members (7a) (7b) which are fitted to the outer peripheral surface thereof and which are split in two in a direction orthogonal to the valve axis direction. Since the rubber valve seat (3) is sandwiched and fixed in the fitting groove (2) provided in the inner peripheral surface, the entire outer ring can be easily disassembled by removing the outer ring members (7a) and (7b). You can do it.

Since the rubber valve seat (3) is formed to have the same width as the valve body boss portion around the valve shaft, the rubber valve seat can have the minimum necessary width, and the material cost can be reduced. ,
The inner peripheral surface that comes in contact with and separates from the valve body is constructed with a part of the spherical surface of the same center as the outer peripheral surface of the valve body, so that no excessive rotational force is applied when the valve body rotates, and excessive wear is prevented. I can. Furthermore, since the rubber valve seat is formed in a trapezoidal cross section and the corners are rounded in an arcuate shape, there is no thin-walled portion, wall-thickened portion or acute-angled portion, and tension or compression due to sliding contact with the valve disc It reduces the risk of cracking.

Since the valve bodies (1a) and (1b) are joined at the joint surface of the cross section, the centering of the valve body is facilitated, the fitting with the rubber valve seat is ensured, and further the outer ring member The mating can be done securely.

The valve rod is divided into a drive side and a floating side and is fixed to the valve body as a separate body, and the rubber valve seat is fitted in the fitting groove and a step is formed between the rubber valve seat and the inner peripheral surface of the valve body. Since it can be incorporated so as not to occur, pressure loss can be reduced.

Since a slit is formed on the outer end surface of the drive side valve rod so as to match the direction of the valve body, even when connecting pipes,
The direction of the valve body can be easily confirmed.

(Effect of the Invention) According to the present invention, the butterfly valve can be disassembled and assembled easily and reliably, so that periodic cleaning can be easily performed, and the rubber valve seat can reduce the material cost. Moreover, it is particularly suitable for applying a rubber valve seat made of a material having a low physical property value and a high material cost because it is free from excessive wear and less likely to cause cracks, and is extremely excellent as a butterfly valve for medicines and foods and drinks. A structure can be provided.

[Brief description of drawings]

1 is a front view, FIG. 2 is a plan view, FIG. 3 is a cross-sectional view, FIG. 4 is a cross-sectional view showing a state in which a valve body is incorporated, FIG. 5 is an exploded perspective view, and FIG. A partially enlarged cross-sectional view showing the joint surface,
FIG. 7 is a partially enlarged cross-sectional view of the rubber valve seat, FIG. 8 is a partially enlarged cross-sectional view showing the fitting of the valve body and the outer ring member, and FIGS. 9 and 10 are cross-sectional views showing the joint with the pipe. is there. (1a) (1b) …… Valve body, (2) …… Mating groove (3) …… Rubber valve seat, (4) …… Valve disc (5) …… Drive side valve rod, (6) …… Floating valve rod (7a) (7b) …… Outer ring member, (8) …… Tightening bolt (9) …… Valve shaft hole, (10) …… Joint surface (11) …… Valve shaft hole, (12 ) …… Valve shaft cylinder (13) …… Slit, (14) …… Mating surface (15a) (15b) …… Flange part (16) …… Mounting flange, (17) …… Annular groove (18)… … O-ring, (19) …… Piping pipe (20) …… Joint flange

Claims (6)

[Scope of utility model registration request] 1. A pair of valve bodies (1a) (1b), which are divided into two in the valve axis direction and form a fitting groove (2) having a trapezoidal cross section on the inner peripheral surface when joined, and the fitting groove. A rubber valve seat (3) having a trapezoidal cross section fitted in (2) and a disc-shaped valve body (3) in which a drive side valve rod (5) and a floating side valve rod (6) are fixed at diametrically opposed positions ( 4) and a pair of ring-shaped outer ring members (7a) (7b) which are split in two in a direction orthogonal to the valve axis direction and which are fitted to the outer peripheral surface of the valve body (1a) (1b). , The valve bodies (1a) and (1b) are joined by the cross-section joint surface (10), and the valve bodies (1a) and (1b) and the outer ring members (7a) and (7b) are fitted by the cross-section mating surfaces. In addition, the butterfly valve is characterized in that the outer ring members (7a, 7b) are assembled by tightening with tightening bolts. 2. The butterfly valve according to claim 1, wherein the inner peripheral surface width of the rubber valve seat is formed to be the same as the width of the valve body boss portion. 3. A butterfly valve according to claim 1, wherein the inner peripheral surface of the rubber valve seat and the outer peripheral surface of the valve body are part of a spherical surface having the same center. 4. A rubber valve seat, wherein the inner peripheral surface of the valve shaft hole is formed as an arcuate surface projecting inward.
The butterfly valve according to (2) or (3). 5. A butterfly valve according to claim 1, wherein a slit is formed on the outer end surface of the drive side valve rod so as to coincide with the direction of the valve body. 6. An O that adheres to a pipe on the outer end surface of the valve body.
The butterfly valve according to claim 1, further comprising a ring.