JPH07293711A - Butterfly valve - Google Patents

Abstract

PURPOSE:To provide a butterfly valve where the cleaning and assembly/overhaul work can be facilitated. CONSTITUTION:A passage is opened/closed by rotating a plate-shaped valve element 3 in a cylindrical valve box 2, and a pair of recessed parts is formed in the valve element, and a holder 15 is mounted in a hole 5 formed in the valve box in an attachable/detachable manner, and a tip part 16 of the holder 15 is inserted in the recessed part of the valve element. A handle 20 is mounted in a hole 6 formed in the valve box in an attachable/detachable manner, and a tip part 22 of the handle 20 is inserted in the recessed part of the valve element in a locking/releasing manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve which opens and closes a passage by rotating a flat plate-shaped valve element in a cylindrical valve box.

[0002]

2. Description of the Related Art Conventionally, a butterfly valve is well known and, for example, as shown in FIG. 9, a pair of holes 5 is formed in a cylindrical valve housing 50 which is composed of a pipe having a size of about 250A.
1, 51 are perforated, and a rubber sheet 52 is provided on the inner surface of the valve box 50.
Is pasted. As shown in FIG. 10, a disc-shaped valve body 53 has a through hole 54 formed therein, and a valve rod 55 has a handle 56 attached thereto. Then, the valve element 53 is inserted into the valve box 50, and the valve rod 55 inserted into the hole 51 from the outside of the valve box 50 is passed through the through hole 54 of the valve element 53 and the valve pin 55 is inserted with the two pins 57. On the other hand, the valve body 53 is fixed.

[0003]

However, in the conventional butterfly valve, the size of the through hole formed in the valve body is, for example, φ25, and the length is 250 mm, which is elongated.
It is extremely difficult to clean this through hole. Moreover, the total weight of the butterfly valve is about 20 kg and the length of the valve rod is 300 mm, which makes it very difficult to assemble and disassemble the valve. The rubber sheet is generally attached to the inner surface of the valve box with a bond. After long-term use, the adhesive surface is peeled off and cleaning water or powder enters the gap between the rubber sheet and the inner surface of the valve box. However, there is a problem that it cannot be removed. Further, as the material of the conventional rubber sheet, neoprene 60 ° is usually used, but neoprene is hard and requires a great deal of labor for the attachment and detachment work of the rubber sheet. Further, there is a problem that metal scraps are generated during a short period of use due to friction between metal members at the contact portion between the hole formed in the valve box and the valve rod.

Therefore, an object of the present invention is to solve the above problems and to provide a butterfly valve which is easy to clean and assemble and disassemble.

[0005]

According to the present invention, a passage is opened and closed by rotating a flat plate-shaped valve element in a cylindrical valve box, and a pair of recesses are formed in the valve element. , A pair of holes formed in the valve box, with a pressing member being removably attached to one of the pair of holes formed in the valve box, and the tip of the pressing member being inserted into one of the recesses of the valve body. There is provided a butterfly valve in which a handle is detachably attached to the other of the two and the tip end of the handle is removably inserted into the other of the recesses of the valve body.

The butterfly valve further has the following features. -Install a packing sheet made of silicon resin that is pressure-bonded to the inner surface of the closed valve body on the inner surface of the valve box.・ Install a bush in the hole formed in the valve box.・ Install a sack at the tip of the retainer and handle to prevent the generation of metal scraps.

[0007]

According to the butterfly valve of the present invention, in comparison with the conventional elongated through hole formed in the valve body through the valve rod having a length of 300 mm, one of the pair of holes formed in the valve box is provided. The most characteristic feature is that the valve body is pivotally supported from both sides by attaching a retainer and attaching a handle to the other hole. According to the butterfly valve of the present invention, it is sufficient to provide the valve body with the recess into which the tip of the retainer is inserted and the recess into which the tip of the handle is removably inserted. Since it is not necessary to form a through hole in the valve body, cleaning work is extremely easy. Further, the valve can be assembled simply by inserting the tip of the retainer and the tip of the handle into the recess formed in the valve body, and the assembling work is significantly simplified.

[0008]

1 is a plan view of a butterfly valve 1 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1A.

A disc-shaped valve body 3 is installed inside a valve box 2 formed in a cylindrical shape. The valve box 2 is provided with a pair of holes 5 and 6, and bushes 7 and 8 are attached to the holes 5 and 6, respectively. The bushes 7 and 8 are preferably made of a material having high wear resistance such as Teflon (registered trademark of polyfluoroethylene fiber). A packing sheet 10 made of silicone resin is attached to the inner surface of the valve box 2.
The packing sheet 10 is fixed to the inner surface of the valve box 2 by a packing pressing ring 11 without using a bond. As shown in FIG. 3, the packing sheet 10 is provided with a pair of holes 12 and 13 corresponding to the holes 5 and 6 of the valve box 2. Silicon 50 ° is used for the packing sheet 7 of the embodiment.

One hole 5 of the valve box 2 and the packing sheet 10
A retainer 15 is detachably attached to the one hole 12 by, for example, screwing it into the valve box 2. A sack 14 for preventing the generation of metal scraps is attached to the tip portion 16 of the retainer 15, and the retainer 15 is attached to the valve box 2.
The tip portion 16 is configured to project into the inside of the valve box 2 when mounted. The tip portion 16 has a round bar shape. Further, the base end portion 18 of the pressing tool 17 is knurled in order to facilitate the attachment / detachment work of the pressing tool 15.

The other hole 6 of the valve box 2 and the packing sheet 10
A handle 20 is detachably attached to the other hole 13 of the. The tip portion 21 of the handle 20 is, as shown in FIG.
The shape is such that a tapered surface 22 is provided on a part of the round bar. Similar to the retainer 15, a sack 23 for preventing the generation of metal scraps is attached to the tip portion 21 of the handle 20, and the tip portion 21 when the handle 20 is attached to the valve box 2 is attached.
Is configured to project inside the valve box 2. It should be noted that both the sack 14 and the sack 23 described above may be made of a material having high wear resistance, such as Teflon (registered trademark of polyfluoroethylene fiber). In this way, the valve box 2
Attach the retainer 15 and the handle 20 to the retainer 15
The valve body 3 is supported from both sides by projecting the tip portion 16 of the valve body 22 and the tip portion 22 of the handle 20 into the valve box 2. An operating rod 26 for rotating the valve body 3 is provided at the base end portion 25 of the handle 20.

Next, FIG. 5 is a plan view of the valve body 3, FIG. 6 is a front view of the valve body 3, FIG. 7 is a left side view of the valve body 3, and FIG. 8 is a right side view of the valve body 3. .

The valve body 3 comprises a disc-shaped valve plate 30 having a diameter slightly smaller than the inner diameter of the valve box 2 and a boss portion 31 provided at the center of the valve plate 30. At the left end of the boss portion 31, a recess 32 into which the tip portion 16 of the pressing tool 15 described above is inserted is formed. The concave portion 32 has a round hole shape so as to receive the tip portion 16 of the pressing member 15 formed in a round bar shape. On the other hand, at the right end of the boss portion 31, a recess 33 into which the tip portion 21 of the handle 20 described above is inserted is formed. The concave portion 33 is provided with a surface portion 35 corresponding to the tapered surface 22 provided on the tip portion 21 of the handle 20. In addition, above the boss portion 31, a grip handle 36 for facilitating holding the valve body 3 when the butterfly valve 1 is assembled or disassembled is attached.

In the butterfly valve 1 according to the embodiment of the present invention configured as described above, conventionally, a valve rod having a length of 300 mm is passed through an elongated through hole formed in the valve body. Compared with the above, the holding tool 15 is detachably attached to the one hole 5 formed in the valve box 2 and the handle 20 is detachably attached to the other hole 6, so that the inside of the valve box 2 is pressed. By projecting the tip 16 of the tool 15 and the tip 22 of the handle 20, the valve body 3 can be supported from both sides. At this time, the taper surface 22 provided on the distal end portion 21 of the handle 20 and the surface portion 35 provided on the recess 33 of the valve body 3 are engaged with each other, and the handle 20 is rotated outside the valve box 2 by The valve body 3 can be rotated inside the valve box 2 to open and close the passage.

Therefore, according to this butterfly valve 1, unlike the conventional case, the valve body is not provided with an elongated through hole, and the pressing member 15 is provided in the pair of recesses 32 and 33 formed in the valve body 3. Tip 16 and tip 22 of handle 20
The valve can be assembled simply by inserting, and the assembly work is extremely simple. Further, when cleaning, there is a feature that the cleaning work is extremely easy because it is possible to save the labor of washing the inside of the elongated through hole formed in the valve body as in the conventional case.

If the packing sheet 10 made of silicon 50 ° is used as in the embodiment, the work of attaching and detaching the inner surface of the valve box 2 becomes easy. Further, bushes 7 and 8 are attached to the holes 5 and 6 of the valve box 2, respectively, and the presser 1
Suck 1 on the tip 16 of the handle 5 and the tip 21 of the handle 20.
By depositing 4 and the sack 23, it becomes possible to prevent the generation of metal scraps.

[0017]

According to the present invention, a butterfly valve is provided which is extremely easy to clean and assemble and disassemble. In particular, by mounting a packing sheet made of silicone resin on the inner surface of the valve box, it is possible to significantly improve wear resistance and sealing performance as compared with a conventional rubber sheet made of neoprene. For example, a conventional rubber sheet made of neoprene wears out after about a year of use, and when the hopper is filled with water, the valve portion may leak. However, a packing sheet made of silicone resin should be attached. By doing so, we can solve such problems as water leaks,
Therefore, the butterfly valve of the present invention has an excellent feature that it can be sufficiently used as a valve for a passage through which a liquid flows.

[Brief description of drawings]

FIG. 1 is a plan view of a butterfly valve according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the arrow in FIG.

FIG. 3 is a vertical sectional view of a packing sheet.

FIG. 4 is a cross-sectional view taken along the arrow in FIG. 2B-B.

FIG. 5 is a plan view of the valve body.

FIG. 6 is a front view of the valve body.

FIG. 7 is a left side view of the valve body.

FIG. 8 is a right side view of the valve body.

FIG. 9 is a vertical cross-sectional perspective view of a valve box for explaining the related art.

FIG. 10 is an exploded view of a valve body for explaining a conventional technique.

[Explanation of symbols]

 2 valve box 3 valve body 5, 6 hole 15 retainer 16 tip of retainer 20 handle 22 tip of handle 32, 33 recess

Claims (4)

[Claims] 1. A method for opening and closing a passage by rotating a flat valve body in a tubular valve box, wherein a pair of recesses are formed in the valve body, and a pair of holes formed in the valve box. The presser is detachably attached to one of the recesses, the tip of the presser is inserted into one of the recesses of the valve body, and the handle is detachably attached to the other of the pair of holes formed in the valve box. A butterfly valve in which the tip of the handle is removably inserted into the other of the recesses of the valve body. 2. The butterfly valve according to claim 1, wherein a packing sheet made of a silicone resin is attached to the inner surface of the valve box so as to be crimped to the peripheral surface of the closed valve body. 3. The butterfly valve according to claim 1, wherein a bush is attached to a hole formed in the valve box. 4. The butterfly valve according to any one of claims 1 to 3, wherein a sack for preventing the generation of metal scraps is attached to the tip of the pressing member and the handle.