JPH09144898A - Butterfly valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a butterfly valve capable of flowing fluid even if a passage is completely cut off by arranging a valve element to open and close the passage in a valve casing, arranging plural through holes penetrating in the obverse- reverse direction in this valve body, and arranging plugs to block up the through holes so as to be freely mountable and demountable. SOLUTION: A valve element having a diameter equal to an inside diameter of a passage 3 is arranged in the passage 3 arranged in a valve casing 2 of a butterfly valve 1, and this is rotating around the axis of a valve bar 5, and the passage 3 is driven so as to be opened and closed. Plural through holes 6 and 6 to form a passing waterway by penetrating in the obverse-reverse direction are arranged in this valve element, and plugs 7 and 7 to respectively block up these are arranged so as to be freely mountable on an demountable from the valve element. When fluid is required to be completely cut off, the passage 3 is fully closed by the valve element to block up the through holes 6 and 7 by the plugs 7 and 7. Even if the passage 3 is fully closed, when it is necessary to flow a small quantity of fluid, the plugs 7 and 7 are removed, and the fluid can be flowed from the through holes 6 and 6.

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 flow path in a valve box by rotating around a shaft of a valve rod in the valve box.

[0002]

2. Description of the Related Art As shown in FIG. 3, a valve body 14 is provided in a flow passage 13 provided in a valve box 12 of a butterfly valve 11, and the valve body 14 has a shaft of a valve rod 15. The flow path 13 is opened and closed by rotating around the center. Further, since the butterfly valve 11 is a clearance butterfly valve used for waterworks, agricultural waterworks, industrial waterworks, etc., which does not need to completely shut off the fluid, even if the flow passage 13 is fully closed by the valve body 14. There was a gap between the peripheral edge of the valve body 14 and the inner peripheral surface of the valve box 15.

[0003]

According to the above-mentioned conventional structure, even if the flow passage 13 is completely closed by the valve body 14, there is a gap between the peripheral edge of the valve body 14 and the inner peripheral surface of the valve box 15. Since the was opened, the fluid was flowing through the gap. For this reason, when it is desired to completely close the flow path 13 to completely shut off the fluid, it is necessary to replace the valve body 14 with a valve body having a diameter equal to the inner diameter of the flow path 13, which is very troublesome. There was a problem.

The present invention solves the above-mentioned problems, and
It is an object of the present invention to provide a butterfly valve that can completely block a flow path when fully closed, and that can flow a fluid even when the flow path is completely blocked.

[0005]

In order to solve the above-mentioned problems, a valve body is arranged in the valve box to open and close a flow path in the valve box by rotating around the axis of a valve rod. It is characterized in that the body is provided with a plurality of through holes penetrating in the front-back direction to form a water passage and a plug for closing the through holes is detachably provided.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a valve body 4 having a diameter equal to the inner diameter of the flow passage 3 is provided in the flow passage 3 provided in the valve box 2 of the butterfly valve 1 according to the present invention. The valve body 4 is rotated around the axis of the valve rod 5 to open / close the flow path 3. Further, the valve body 4 is provided with a plurality of through holes 6, 6 penetrating in the front-back direction to form a water passage, and plugs 7, 7 for respectively closing the through holes 6, 6 are provided on the valve body 4. On the other hand, it is detachably attached.

In the above structure, as shown in FIG. 1, when it is desired to completely shut off the fluid, the flow passage 3 is completely closed by the valve body 4 closing the through holes 6, 6 with the plugs 7, 7. . Further, even when the flow path 3 is completely closed by the valve body 4, when a small amount of fluid needs to flow, the through holes 6 of the valve body 4 are closed as shown in FIG. Plug 7, 7
And the fluid is circulated through the through holes 6, 6.

[0008]

As described above, according to the present invention, when it is desired to completely close the flow path and completely shut off the fluid, the fluid flow is completely shut off when the through hole is closed by the plug. You can Further, even if the flow path is completely closed, if a small amount of fluid needs to flow, the fluid can be flowed by removing the plug that closes the through hole of the valve body.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of the butterfly valve according to the embodiment when a through hole of a valve body is closed by a plug.

FIG. 3 is a sectional view of a conventional butterfly valve.

[Explanation of symbols]

 2 Valve box 3 Flow path 4 Valve body 5 Valve rod 6 Through hole 7 Plug

Claims (1)

[Claims] 1. A valve body is provided in a valve box for rotating around a shaft axis of a valve rod to open and close a flow path in the valve box, and a water passage is formed through the valve body in a front-back direction. The butterfly valve is characterized in that a plurality of through holes are provided and a plug that closes the through holes is detachably provided.