JPH09177996A - Butterfly valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a valve element from remaining in the middle domain of a flow passage during the whole opening of the flow passage, and to make it difficult to accumulate a foreign matter in a valve casing. SOLUTION: A valve rod 36 is provided below the axial center of a flow passage 34 in a valve casing 35, and a valve element 37 is provided with eccentricity taken from the axial center of the valve rod 36 to form a secondary eccentric type of butterfly valve 31. The valve casing 35 is formed so that a lower inner periphery 35a may have a straight extending ability along a flow direction, and an upper inner periphery 35b may form an circular arced face upward, and the valve element 37 is rotatably provided ranging over a position for covering an opening 32 and a position opposite to the upper inner periphery 35b of the valve box. Rubber seat parts 38a, 38b are provided ranging over the upper and the lower peripheral edge of the valve element 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a butterfly valve provided in a fluid conduit for water supply / sewerage.

[0002]

2. Description of the Related Art Generally, in fluid pipelines for water supply and sewerage, a gate valve is used as a water shutoff valve when the pipeline has a small diameter and a butterfly valve is used when the pipeline has a large diameter. However, the type of valve to be used is decided in consideration of price, size and the like.

As a sluice valve in a pipeline in which a fluid containing a foreign substance flows, such as a countermeasure against red water or agricultural sewage, a sluice valve shown in FIGS.
A soft-seal sluice valve such as that shown in is often used.

In the soft seal sluice valve 1, the valve box main body 2 is formed by providing tubular portions 4 and 5 serving as connection ports on both sides of the valve chamber 3, and the valve of the tubular portion 5 is provided in the valve chamber 3. A valve body 6 covering the indoor opening 5a is supported and guided by a valve rod 7 and a guide body 8 and is provided so as to be able to move in and out in the vertical direction.

The valve chamber 3 is formed so as to widen upward from the bottom portion in a V shape, and has a tubular portion 4, a valve chamber 3, and a tubular portion 5.
The lower inner peripheral surfaces 4a, 3a, 5b are formed without any step.

The valve body 6 has a lower part along the inner peripheral surface of the lower part of the valve chamber 3, and an upper part thereof is a valve chamber opening 5a of the tubular part 5.
The rubber lining 9 is provided over the entire surface.

On the inner peripheral surface of the valve chamber 3 along the upper peripheral edge of the valve chamber opening 5a of the tubular portion 5, a pressure contact rib 3 for pressure contacting the valve body 6 is formed.
b is provided circumferentially, the rubber lining 9 on the upper peripheral edge of the valve body 6 forms a convex portion 9a that engages with the pressure contact rib 3b, and the rubber lining 9 on the lower peripheral edge of the valve body is Room 3
A thick portion 9b that is pressed against the lower inner peripheral surface 3a.

A soft seal sluice valve 1 having such a configuration
The thick portion 9b at the lower peripheral edge of the valve body 6 is in pressure contact with the lower inner peripheral surface 3a of the valve chamber 3, and the convex portion 9a at the upper peripheral edge of the valve body 6 is the crimp rib 3b of the valve chamber 3. Since the valve body 6 covers the valve chamber opening 5a of the tubular portion 5 and closes the internal flow path in a state of being engaged with and pressed against the valve body 5, like the other valves, the valve body is attached to the lower inner peripheral surface 3a of the valve chamber 3. There is no need to form a groove or a convex portion for locking 6 to stop water, and this has an advantage that foreign matter is unlikely to accumulate.

When the butterfly valve is installed in a place such as a sewer where a large amount of foreign matter is contained in the fluid, a horizontal type in which the valve rod horizontally crosses the flow path is preferable. This is because the gap generated at the valve rod is small.

The concentric butterfly valve 11 shown in FIG.
A disc-shaped valve body 14 capable of opening and closing the flow path 13 is arranged inside the valve box 12, and the valve body 14 is opened and closed around the axis of a valve rod 15 penetrating the valve body 14 in the diameter direction. Is configured to let. Normally, a convex valve box seat 16 is provided at a portion of the inner peripheral surface of the valve box 12 where the peripheral edge of the valve body 14 is slidably contacted, in order to ensure water shutoff when the flow path is blocked by the valve body 14.
Are provided circumferentially.

The primary eccentric butterfly valve 21 shown in FIG.
Has a disc-shaped valve body 24 capable of opening and closing the flow passage 23, and a valve rod 25 provided at a position eccentric from the valve body 24 inside a valve box 22 having a widened central portion. The valve body 24 is configured to be opened and closed and rotated around the axis. A valve box seat 26 is circumferentially provided on the inner peripheral surface of the valve box 12. Such an eccentric butterfly valve 21 has a flow path 23.
Since the valve element 24 does not remain in the central region of the flow path 23 when the valve is fully opened, it is preferably used for sludge discharge and the like.

[0012]

However, as described above, the soft seal sluice valve 1 is provided with the groove or the convex portion for locking the valve body 6 on the lower inner peripheral surface 3a of the valve chamber 3 to stop the water. Since it is not formed, it has the advantage that foreign matter does not easily accumulate, but from the viewpoint of price and size, it is suitable for small diameter pipelines and difficult to use for large diameter pipelines. There is.

In the concentric butterfly valve 11, the valve body 14 remains in the central region of the flow path 13 when the flow path 13 is fully opened, and the valve box 1
The type in which the valve box seat 16 is provided on the inner peripheral surface of 2 is
There is a problem that foreign matter is likely to accumulate on the valve box seat 16.

The primary eccentric butterfly valve 21 has a flow path 23.
Although the valve body 24 does not remain in the central region of the flow path 23 when fully opened, the central portion of the valve box 22 is widened in order to open and close the valve body 24 around the axis of the valve rod 25. There is a problem that foreign matter is likely to accumulate on the part.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a butterfly valve in which a valve element does not remain in the central region of a flow passage when a flow passage is fully opened, and foreign matter does not easily accumulate in a valve box. To do.

[0016]

In order to solve the above-mentioned problems, a butterfly valve according to claim 1 of the present invention is a valve box in which internal passages formed between opposed openings are arranged in a horizontal direction. A valve rod that horizontally traverses the flow passage is provided below the axis of the flow passage inside the valve box, and the valve rod rotates around the axis of the valve rod at a position eccentric to the axis of the valve rod. A butterfly valve provided with a valve body for opening and closing a passage, wherein the valve box has a lower inner peripheral surface that is extensible along the flow direction, and an upper inner peripheral surface extending from one opening to the other is upward. An arcuate surface, the valve body is rotatably provided over a position where the flow passage is completely closed by covering one opening, and a position where the flow passage is fully opened facing the upper inner peripheral surface of the valve box. A rubber sheet, which is in pressure contact with the inner peripheral surface of the valve box, is provided on the peripheral portion of the valve body over the entire circumference of the valve body.

A butterfly valve according to claim 2 of the present invention comprises:
A pressure-contact rib for pressure-contacting the valve body is provided on the inner peripheral surface of the valve box along the upper peripheral edge of one opening, and a rubber sheet on the upper peripheral edge of the valve body is engaged with the pressure-contact rib in the rotational direction of the valve body. It is formed in a convex shape that fits.

A butterfly valve according to claim 3 of the present invention comprises:
The valve body has a shape in which a cross-section in the direction crossing the flow path widens in a V shape from the bottom toward the upper side, and the valve body has a shape in which the lower side is along the lower inner peripheral surface of the valve case, The upper portion is formed so as to have a shape along the peripheral edge of the opening.

In the structure according to the first aspect of the present invention, when closing the flow passage, the valve body is rotated around the axis of the valve rod so as to cover one opening of the valve box, and the lower peripheral portion of the valve body is arranged. The rubber sheet of is pressed against the inner surface of the lower part of the valve box,
The rubber sheet on the upper peripheral edge of the valve body is pressed against the inner peripheral surface of the valve box along the upper peripheral edge of one opening. At this time, since the valve rod is provided below the axial center of the flow path, the valve body should be pushed down to reach the position orthogonal to the flow path after reaching the position covering one opening of the valve box. The pressure contact between the rubber sheet on the upper peripheral edge of the valve body and the pressure contact rib of the valve box, and the pressure contact between the rubber sheet on the lower peripheral edge of the valve body and the lower inner peripheral surface of the valve box are large, resulting in high stoppage. Aqueous is obtained.

When the flow path is opened, the valve body is rotated in the opposite direction about the axis of the valve rod and is arranged at a position facing the upper inner peripheral surface of the valve box. In this state, since the valve body is not present in the central region of the flow path, the fluid flows smoothly, and the lower inner peripheral surface of the valve box has straight extensibility along the flow direction. The foreign substances contained in the water flow down without accumulating in the valve box.

When the valve body is opened and closed and rotated, the valve body moves upward while drawing an arcuate locus, but since the upper inner peripheral surface of the valve box forms an arcuate surface upward, An appropriate distance is maintained between the upper inner peripheral surface and the valve body.

According to the second aspect of the present invention, when the flow passage is closed, the rubber sheet at the upper peripheral edge portion of the valve body is brought into engagement pressure contact with the pressure contact rib of the inner peripheral surface of the valve box from above, and the lower peripheral edge portion of the valve body is engaged. In the state where the rubber sheet of the section is pressed against the inner peripheral surface of the lower portion of the valve box, it will be pushed down as described above,
The pressure contact between the rubber sheet at the upper peripheral edge of the valve element and the pressure contact rib of the valve box and the pressure contact between the rubber sheet at the lower peripheral edge of the valve element and the lower inner peripheral surface of the valve box are increased, and the waterproofness is enhanced.

According to the third aspect of the invention, when closing the flow path, the lower end of the valve body and the lower end portion of the opening coincide with each other at the lower end of the opening, and the peripheral edge of the valve body above the lower end. When the portion is outside the opening and the upper end portion of the valve body is located above the upper end portion of the opening at the upper end portion of the opening, the valve body comes into pressure contact with the valve box, and the water blocking performance is further enhanced.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a vertical cross-sectional view of a butterfly valve according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the valve box of the butterfly valve taken along the line A′-A ′. Butterfly valve 31
Is provided with a valve box 35 so that the internal flow passage 34 formed between the openings 32 and 33 facing each other extends in the horizontal direction.
A valve rod 36 that horizontally traverses the flow passage 34 is provided below the axis of the flow passage 34, and the valve rod 36 is rotated around the axis of the valve rod 36 at a position eccentric from the axis of the valve rod 36. It is configured by providing a valve body 37 that opens and closes the flow path 34.

The cross section of the valve box 35 in the direction crossing the flow passage has a shape that widens upward from the bottom portion in a V shape, and the lower inner peripheral surface 35a has straight extensibility along the flow direction and has an opening. An upper inner peripheral surface 35b extending from 32 to the opening 33 is formed so as to form an arc surface upward.

The lower portion of the valve element 37 is the lower inner peripheral surface 3 of the valve box.
5a, the upper part has a shape along the peripheral edge of the opening 32, and faces the position where the flow path 34 is completely closed by covering the opening 32 and the upper inner peripheral surface 35b of the valve box. And the position where the flow path 34 is fully opened is provided rotatably.

A pressure contact rib 35c, which is in pressure contact with the valve element 37, is circumferentially provided on the inner peripheral surface of the valve box 35 along the upper peripheral edge of the opening 32. A rubber lining 38 is applied to the entire surface of the valve body 37, and the rubber lining 38 on the upper peripheral edge of the valve body 37 has a convex shape that engages with the pressure contact rib 35c of the valve box 35 in the rotational direction of the valve body 37. Seat portion 38a
And a rubber lining 38 on the lower peripheral edge of the valve body 37.
Is the seat portion 3 that is in pressure contact with the lower inner peripheral surface 35a of the valve box 35.
8b.

In the butterfly valve 31 having the above-mentioned structure, when the flow passage 34 is closed, the valve body 37 is replaced by the valve rod 36.
And is arranged at a position that covers the opening 32 in a state of being orthogonal to the flow path 34, while the seat portion 38b of the lower peripheral edge portion of the valve body 37 is pressed against the lower inner peripheral surface 35a of the valve box. The seat portion 38a of the upper peripheral portion of the valve body 37 is engaged with and brought into pressure contact with the pressure contact rib 35c provided on the inner peripheral surface of the valve box 35.

At this time, the valve rod 36 is provided below the axis of the flow path.
Since the valve body 37 is provided with the opening 32 of the valve box 35,
After reaching the position covering the valve, it is pushed downward to reach the position orthogonal to the flow path, and the rubber sheet portion 38a of the upper peripheral portion of the valve body 37 and the pressure contact rib 35c of the valve box 35 are pressure contacted, and the valve Rubber sheet portion 38 on the lower peripheral edge of the body 37
The pressure contact between b and the inner peripheral surface 35a of the lower portion of the valve box becomes large, and high water shutoff can be obtained.

At this time, as described above, the valve box 35
Widens in a V-shape from the bottom toward the top,
7, since the lower side is along the lower inner peripheral surface 35a of the valve box 35 and the upper side is along the peripheral edge of the opening 32,
In the state where the valve body 37 covers the outside of the opening 32 from the lower end to the upper end of the opening 32, the valve box 35
Since it is in pressure contact with, it is possible to obtain a higher waterproofness.

When the flow path 34 is opened, the valve element 37 is rotated in the opposite direction about the axis of the valve rod 36 and is arranged at a position facing the upper inner peripheral surface 35b of the valve box. In this state, since the valve element 37 does not exist in the central region of the flow path 34, the fluid flows smoothly, and the lower inner peripheral surface 35a of the valve box has a straight extensibility along the flow direction. Therefore, the foreign matter contained in the fluid flows down without depositing in the valve box 35.

When opening and closing the valve element 37,
Although the valve body 37 moves upward while drawing an arcuate locus, the upper inner peripheral surface 35b of the valve box forms an upward arc surface, so that the upper inner peripheral surface 35b of the valve box and the valve body 37 are separated from each other. An appropriate distance is maintained between them, and the valve body 37 does not slide on the upper inner peripheral surface 35b of the valve box.

[0033]

As described above, according to the present invention, as the secondary eccentric butterfly valve, the lower inner peripheral surface of the valve box is formed so as to have a straight extensibility.
The valve body does not move to a position facing the upper inner peripheral surface of the valve box and interferes with the flow of the fluid, and there is no risk of foreign matter contained in the fluid accumulating in the valve box. On the other hand, when closing the flow path, the valve body having the rubber sheet on the peripheral edge is pressed against the opening peripheral edge of the valve box and then pushed down to contact the lower inner peripheral surface of the valve box. Even if the inner peripheral surface of the lower portion has a straight stretchability, a high water blocking effect can be obtained.

A pressure contact rib is provided on the inner peripheral surface of the valve box along the upper peripheral edge of the opening, and a rubber sheet on the upper peripheral edge of the valve body is formed into a convex shape that engages with the pressure contact rib in the rotational direction of the valve body. As a result, when the flow path is closed, the rubber sheet at the upper peripheral edge portion of the valve body is engaged with the pressure contact ribs on the inner peripheral surface of the valve box from above, and the rubber sheet at the lower peripheral edge portion is in the lower part of the valve box. It is pushed down in the state of being pressed against the inner peripheral surface, so that higher water blocking performance can be obtained.

Further, the valve box has a cross-section in the direction crossing the flow path that widens upward from the bottom in a V shape, and the valve body has the lower side along the lower inner peripheral surface of the valve box. When the flow path is closed, the valve body is formed into a shape that has a curved shape and the upper portion has a shape along the peripheral edge of the opening.
It covers from the lower end to the upper end of the opening to the outside of the opening, which also provides a higher water blocking effect.

[Brief description of the drawings]

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

FIG. 2 is A′-A ′ of the valve box of the butterfly valve shown in FIG.
It is arrow sectional drawing.

FIG. 3 is a partially crushed view showing the entire structure of a conventional soft seal sluice valve.

FIG. 4 is a partially crushed view showing the soft seal sluice valve of FIG. 3 from another direction.

FIG. 5 is a vertical cross-sectional view showing the overall configuration of a conventional concentric butterfly valve.

FIG. 6 is a vertical cross-sectional view showing the overall configuration of a conventional primary eccentric butterfly valve.

[Explanation of symbols]

 31 Butterfly valve 32, 33 Opening 34 Internal flow path 35 Valve box 35a Lower inner peripheral surface 35b Upper inner peripheral surface 35c Pressure contact rib 36 Valve rod 37 Valve body 38a Seat portion 38b Seat portion

Claims (3)

[Claims] 1. A valve box is provided so that internal flow passages formed between opposed openings extend along a horizontal direction, and a valve rod that horizontally crosses the flow passage is provided inside the valve box. A butterfly valve having a valve body that is provided below and that opens and closes a flow path by rotating about the axis of the valve rod at a position eccentric from the axis of the valve rod, wherein the valve box has a lower inner peripheral surface. Has a straight extensibility along the flow direction, and an upper inner peripheral surface extending from one opening to the other opening forms an upward arc surface, and the valve body covers one opening to completely close the flow path. A rubber sheet that is rotatably provided at a position facing the inner peripheral surface of the upper portion of the valve box to fully open the flow path, and a rubber sheet that is in pressure contact with the inner peripheral surface of the valve element is provided at the peripheral edge of the valve element over the entire periphery of the valve element. A butterfly valve characterized by being provided. 2. A pressure-contact rib for press-contacting the valve body is provided on the inner peripheral surface of the valve box along the upper peripheral edge of one opening, and a rubber sheet on the upper peripheral edge of the valve body is provided to the pressure-contact rib. The butterfly valve according to claim 1, wherein the butterfly valve is formed in a convex shape that engages in the rotational direction of the. 3. The valve box has a cross-section in a direction crossing the flow passage that widens upward from the bottom in a V shape.
3. The valve body according to claim 1, wherein the valve body is formed so that a lower side portion has a shape along a lower inner peripheral surface of the valve box and an upper side portion has a shape along a peripheral edge of the opening. Butterfly valve according to any one of.