JPH0750615Y2 - Butterfly valve - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Industrial field of application) The present invention relates to a butterfly valve to be mounted on pipes of water, oil, gas, etc., and in particular, it is easy to connect to the pipes and can be connected. The butterfly valve has excellent features such as a small space for and a good seat property.

(Prior art and its problems) Many of the conventional butterfly valves are wafer type, and a single set of flanges is required to attach this wafer type butterfly valve to a pipe. The connection had to be made by screwing or welding, the work was cumbersome, and a large space was required for the connection.

Further, the expansion and contraction and bending of the pipe cannot be absorbed, which causes inconvenience such as leakage.

Although a flange type or a welding type butterfly valve is also manufactured, the former requires one set of flanges and has the same problem as in the case of the wafer type described above. Further, in the latter case, there is a problem that the elastic material such as rubber is damaged by the welding heat and the expansion and contraction of the pipe cannot be absorbed.

The present invention is intended to solve the problems of these conventional butterfly valves.

Configuration of the Invention (Means for Solving the Problems) The present invention has the following structure in order to solve the problems of the conventional butterfly valve described above.

A seat ring made of an elastic material such as rubber is fitted on the inner peripheral surface of the annular body, and a disc-shaped disc is attached to the inside of the seat ring, and the disc is rotated to bring it into sealing contact with the seat ring. A butterfly valve that closes
The seat ring is provided with a pipe seal part projecting on both sides of the body, and the pipe seal part has both end faces formed in a conical surface, and the inner surface of the cylinder is in close contact with the outer peripheral surface of the pipe to be connected. A two-divided cover, which is formed into a circular shape and is mounted so as to sandwich the body and the pipe seal portion, is connected by a bolt, and the both end surfaces are compressed by the conical inner surface formed on the cover, and the pipe seal portion is formed. Was tightly sealed to the outer peripheral surface of the pipe.

In this case, the pipe sealing portion may be shaped to be pressed inward in the radial direction by the pressure of the fluid, and annular protrusions protruding inward in the radial direction may be formed at both ends of the cover. May be fitted into an annular groove formed on the outer peripheral surface of the pipe.

Further, it is preferable to form a circumferential groove and a projection which are fitted to the body and the cover, and a circumferential groove and a projection which are fitted to the body and the seat ring. Should be formed.

(Operation) Since the butterfly valve of the present invention is configured as described above, it operates as follows.

First, loosen the bolts that connect the cover, pipe with an annular groove formed on the outer peripheral surface at an appropriate distance from the pipe end, from both sides of the butterfly valve to the pipe seal portion, and the annular protrusion of the cover in this annular groove. Fit it to a position where it can be fitted and tighten the bolts to join the two-part cover.

At this time, since the annular protrusion fits into the annular groove, the pipe can move only by a margin between the annular protrusion and the annular groove, but does not come off. Since this margin can absorb the expansion and contraction of the pipe, it is preferable to provide only the expansion and contraction due to the expected thermal expansion or thermal contraction of the pipe.

Further, the pipe seal portion has an inner peripheral surface of a cylindrical inner surface that is in close contact with the outer peripheral surface of the pipe, and the conical inner surface of the cover compresses both end surfaces of the conical surface of the pipe seal portion. The pipe seal part is tightly sealed to the pipe to prevent leakage of fluid in the pipe.

Further, since the pipe seal portion is shaped so as to be pressed inward in the radial direction by the pressure of the fluid, the above-mentioned close contact seal is further ensured. Further, since the pipe sealing portion is made of an elastic material such as rubber, it is possible to absorb the bending of the pipe.

Also, since the groove and the protrusion in the circumferential direction are fitted between the body and the cover and between the body and the seat ring, the relative positions of the seat ring, the body and the cover do not change, and both pipe seals The parts are compressed evenly, and the pipes can be reliably connected at both ends. Further, the seat ring does not move due to the rotation of the disc.

Since the butterfly valve of the present invention operates as described above, it is easy to mount on the pipe, the space for mounting is small, the sealing property is reliable, and the expansion and contraction and bending of the pipe are absorbed. It is an excellent valve that can.

Since the body and cover do not come into contact with the fluid, it is not necessary to select the material according to the fluid, and if the material for the seat ring and disc is selected according to the fluid, it is suitable for a wide range of applications such as the conventional butterfly valve of this type. It still has the advantages that discs, stems, etc. can be common with conventional butterfly valves.

(Embodiment) FIG. 1 is a vertical cross-sectional view showing a state where one embodiment of a butterfly valve of the present invention is attached to a pipe, and FIG.
FIG. 3 is a cross-sectional view showing an X-X cross section of the drawing, and FIG.
FIG. 3 is a perspective view showing the assembly of the body, seat ring, disc and stem shown in FIGS.

1 to 3, 1 is a butterfly valve and 2 is a butterfly valve.
Is a body, 3 is a seat ring, 4 is a disc, 5 is a cover, 6 is a bolt, and 7 is a pipe.

In the butterfly valve 1, a seat ring 3 formed of an elastic material such as rubber is fitted on an inner peripheral surface 2a of an annular body 2, and a disc-shaped disc 4 is mounted inside the seat ring 3. It is a valve that opens the valve by rotating the disc 4 so as to make a sealing contact with the seat ring 3.

The seat ring 3 is provided with a pipe seal portion 3a protruding on both sides of the body 2, both end surfaces 3b of the pipe seal portion 3a are formed in a conical shape, and the inner peripheral surface 3c is an outer peripheral surface 7a of the pipe 7. Is formed on the inner surface of a cylinder that is in close contact with. Further, the pipe sealing portion 3a is formed with an annular bag-shaped portion 3d so that it is pressed inward in the radial direction by the pressure of the fluid.

A bolt hole 5a for connecting with a bolt 6 is formed in the two-divided cover 5, and the body 2 and the pipe seal portion 3a are mounted so as to be sandwiched and tightened with the bolt 6. Further, the inner surfaces 5b on both sides of the cover 5 are conical, and the inner surfaces 5b compress both end surfaces 3b of the pipe seal portion 3a to tightly seal the pipe seal portion 3a to the outer peripheral surface 7a of the pipe 7. It has become.

Further, both ends 5c of the cover 5 are formed with annular protrusions 5d protruding inward in the radial direction, and these annular protrusions 5d are fitted into annular grooves 7b formed on the outer peripheral surface 7a of the pipe 7. .

Further, the body 2 and the cover 5 are assembled by fitting the circumferential groove 2b formed on the body 2 and the circumferential projection 5e formed on the cover 5 into each other. Is assembled by fitting the circumferential groove 2c formed in the body 2 and the circumferential projection 3e formed in the seat ring 3 into each other.

Next, the operation will be described based on the embodiment shown in FIGS.

First, the bolt 6 that joins the cover 5 is loosened, and the pipe 7 having the annular groove 7b formed on the outer peripheral surface 7a at an appropriate distance from the pipe end 7c of the pipe 7 is attached to the pipe seal portion 3a from both sides of the butterfly valve 1.
To the position where the annular projection 5d of the cover 5 can be fitted in the annular groove 7b, and the bolt 6 is tightened to tighten the two-divided cover 5
Combine.

At this time, since the annular protrusion 5d is fitted into the annular groove 7b, the pipe 7
Can move only in the margin between the annular protrusion 5d and the annular groove 7b, but cannot move out. Since this margin can absorb the expansion and contraction of the pipe 7, it is preferable to provide only the expansion and contraction due to the expected thermal expansion or contraction of the pipe 7.

Further, the pipe seal portion 3a has an inner peripheral surface 3c in the shape of a cylindrical inner surface that is in close contact with the outer peripheral surface 7a of the pipe 7, and the conical inner surface 5b of the cover 5 covers both end surfaces 3b of the pipe seal portion 3a. Since it is compressed, the pipe seal portion 3a is tightly sealed to the pipe 7 to prevent the fluid in the pipe 7 from leaking.

Further, since the pipe seal portion 3a is formed with the annular bag-shaped portion 3d so as to be pressed inward in the radial direction by the pressure of the fluid, the above-mentioned close seal is further ensured. Further, since the pipe seal portion 3a is made of an elastic material such as rubber, it is possible to absorb the bending of the pipe 7 to a certain extent.

Further, between the body 2 and the cover 5, and between the body 2 and the seat ring 3, the circumferential grooves 2b and 2c and the circumferential protrusion 5e are provided.
Since they are fitted with each other, the relative positions of the seat ring 3, the body 2 and the cover 5 do not change, both pipe seal portions 3a are uniformly compressed, and the pipes can be reliably connected at both ends. Further, the seat ring 3 does not move due to the rotation of the disc 4.

Since the butterfly valve 1 of the present invention operates as described above, it is easy to mount on the pipe 7, the space for mounting is small, the sealing property is reliable, and the pipe 7 expands and contracts and bends. It is an excellent valve that can absorb.

Since the body 2 and the cover 5 are not in contact with the fluid, it is not necessary to select the material depending on the fluid, and if the material for the seat ring 3 and the disc 4 is selected according to the fluid, it is suitable for a wide range of applications. It still has the advantages of the butterfly valve, and the disc 4, stem 8, etc. can be common with conventional butterfly valves.

Effect of the Invention Since the butterfly valve of the present invention is constructed and operates as described in detail above, it has a number of excellent effects as described below.

No separate fittings such as flanges are required to attach to the pipe.

Easy to install on the pipe.

The space for mounting on the pipe may be small.

The pipe will not come out.

No fluid leaks from the connection.

Can absorb expansion and contraction and bending of piping.

The relative positions of the seat ring, body and cover do not shift, the seal connection with the pipes at both ends is even, and the seat ring does not move due to rotation of the disc.

It is not necessary to change the material selection for the body and cover depending on the liquid, and it can be used for a wide range of purposes by selecting the material for the seat ring and disc.

The disc and stem can be shared with conventional butterfly valves.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a state where one embodiment of a butterfly valve of the present invention is attached to a pipe, FIG. 2 is a transverse sectional view showing an XX section of FIG. 1, and FIG. FIG. 3 is a perspective view showing the assembly of the body, the seat ring, the disc and the stem shown in FIGS. 1 and 2 and the two-divided cover. 1 ... Butterfly valve, 2 ... Body 2a ... Inner peripheral surface, 2b, 2c ... Groove 3 ... Seat ring, 3a ... Piping seal part 3b ... Both end surfaces, 3c ... Inner peripheral surface 3e ... Protrusion, 5 ... Cover 5b ... Inner surface, 5c ... Both ends 5d ... Annular projection, 5e ... Projection 6 ... Bolt, 7 ... Piping 7a ... Outer peripheral surface, 7b ... Annular groove

Claims (5)

[Scope of utility model registration request] 1. A seat ring formed of an elastic material such as rubber is fitted on the inner peripheral surface of an annular body, a disc-shaped disc is mounted inside the seat ring, and the disc is rotated to rotate the sheet. A butterfly valve that closes a ring by sealingly contacting the ring, wherein the seat ring is provided with a pipe seal portion projecting to both sides of the body, and the pipe seal portion has both end surfaces formed in a conical surface shape and has an inner circumference. A conical surface formed on the cover by connecting a two-divided cover that is formed so as to closely contact the outer peripheral surface of the pipe to be connected to the outer peripheral surface of the pipe and clamps the body and the pipe seal portion with a bolt. A butterfly valve, characterized in that both end faces are compressed by a ring-shaped inner surface, and the pipe sealing portion is closely sealed to the pipe. 2. The butterfly valve according to claim 1, wherein the pipe seal portion is shaped to be pressed radially inward by the pressure of the fluid. 3. An annular projection protruding inward in the radial direction is formed at both ends of the cover, and the annular projection is fitted in an annular groove formed on the outer peripheral surface of the pipe. Butterfly valve. 4. A butterfly valve according to claim 1, wherein a circumferential groove and a protrusion are formed on the body and the cover so as to be fitted to each other. 5. A butterfly valve according to claim 1, wherein a circumferential groove and a protrusion are formed on the body and the seat ring so as to be fitted to each other.