JP2005009512A - Ball valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball valve which can be easily set to the state opened for a minute flow rate. <P>SOLUTION: The ball valve 1 comprises a valve body 10 having a ball receiving chamber 11 and a pair of fluid passages 12a, 12b provided on both sides of the ball receiving chamber 11, a pair of annular valve seats 20a, 20b arranged in the valve body 10, a ball 30 which is received between a pair of the annular valve seats 20a, 20b in the ball receiving chamber 11 so as to rotate about a rotation axis and has a through hole 32 formed in the direction perpendicular to the rotation axis, and a valve rod connected with the upper end of the ball 30 for turning the ball 30 about the rotation axis. The ball 30 has notched grooves 34a, 34b at opposed side ends of both opening edges 33a, 33b of the through hole 32. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ball valve, and more particularly, to a ball valve that can be easily set to a very small valve open state.
[0002]
[Prior art]
A ball valve is attached to a pipe or a tank and is widely used for controlling a fluid flowing therethrough.
The ball valve 100 generally includes a valve body 110 having a ball storage chamber 111 and a pair of fluid passages 112a and 112b provided on both sides thereof as shown in FIG. A pair of annular valve seats 120a, 120b and a pair of annular valve seats 120a, 120b are accommodated in the ball accommodating chamber 111 so as to be rotatable around a rotation axis, and are orthogonal to the rotation axis. A ball 130 having a through hole 131 drilled in a direction, and a valve rod (not shown) connected to the upper end of the ball 130 and driving the ball 130 to rotate about the rotation axis; By rotating the valve stem by an operating part such as a handle or an electric actuator and rotating the ball 130 by about 90 degrees, the valve is fully opened or fully closed. It is those of the work can structure.
[0003]
[Problems to be solved by the invention]
Here, in the ball valve 100, when it is necessary to set the opening degree of the valve in various states, the fully opened state shown in FIGS. 6 (a) and 6 (b), and FIGS. 7 (a) and 7 (b). The semi-opened state shown can be easily set, but setting a very small valve open state shown in FIGS. 8 (a) and 8 (b) is possible by setting a valve stem and a ball or a valve stem and an operating portion. In view of the fact that the association between the ball and the like is not perfect and the ball rotation error is likely to occur, the setting is very difficult.
[0004]
In particular, when an electric actuator is used as the operation unit and the valve opening is set automatically by electric control, the valve opening cannot be finely adjusted using sound etc. unlike manual operation. Because of the fear of the valve being fully closed due to the rotation error, the minimum valve opening has been set to a relatively wide valve opening.
[0005]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a ball valve that can be easily set to a very small valve open state.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a ball valve according to the present invention has a valve body having a ball housing chamber and a pair of fluid passages provided on both sides thereof, and a pair of annular members disposed in the valve body. A ball having a through-hole that is accommodated in the ball accommodating chamber so as to be rotatable about a rotation axis between the pair of annular valve seats and is formed in a direction perpendicular to the rotation axis; A ball valve connected to an upper end of the valve and configured to rotate the ball about the rotation axis and cut the ball into opposite side ends of both mouth edges of the through-hole. A notch was formed.
[0007]
According to the above-described ball valve according to the present invention, a predetermined rotation width in which the position of the ball in a minute valve open state is determined by the length of the notch groove due to the presence of the notch groove formed in the ball. If the ball is positioned within the rotation width, a very small valve open state can be achieved. Therefore, the ball valve can be easily set to a very small valve open state.
[0008]
Here, in the present invention, the notch groove may be formed as a notch groove having a constant width. In this case, a very small amount of valve open state is further reduced within the range of the length of the notch groove. Thus, the ball valve can be easily finely adjusted to the open state.
[0009]
In the present invention, the valve rod for rotationally driving the ball may be connected to an electric actuator. In this case, the opening and closing of the ball valve can be controlled electrically. Thus, the ball valve can be easily set electrically in various states including a very small valve open state.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the above-described ball valve according to the present invention will be described in detail with reference to the drawings.
[0011]
Here, FIG. 1 is a longitudinal sectional view showing an entire ball valve according to the present invention, FIG. 2 is a perspective view showing a ball and a valve rod of the ball valve according to the present invention, and FIG. 3 is a ball valve according to the present invention. It is a cross-sectional view showing the ball.
[0012]
As shown in FIG. 1, the ball valve 1 according to the present invention includes a valve body 10, a pair of annular valve seats 20a and 20b disposed in the valve body 10, and the pair of annular valve seats 20a, It is mainly comprised from the ball | bowl 30 accommodated rotatably between 20b, and the valve rod 40 which rotationally drives the said ball | bowl 30. FIG.
[0013]
The valve body 10 is made of, for example, a casting, and is formed in a cylindrical member having a ball storage chamber 11 and a pair of fluid passages 12a and 12b provided on both sides of the ball storage chamber 11 so as to communicate with the ball storage chamber 11. ing.
[0014]
First, one annular valve seat 20a of the pair of annular valve seats 20a and 20b is inserted into the valve body 10 from the fluid passage 12b side (right side in FIG. 1), and then the ball 30 is inserted. Next, the other annular valve seat 20b is inserted. The previously inserted annular valve seat 20a (left side in FIG. 1) is positioned by a receiving portion 13 formed between the ball housing chamber 11 of the valve body 10 and the fluid passage 12a.
[0015]
Further, inner threads 16a and 14b are formed on the inner peripheral surfaces of the fluid passages 12a and 12b formed in the valve main body 10, respectively, and an inner cylinder 16 having a male screw 15 formed on the outer peripheral portion, the male screw 15 is fluidized. By screwing into a female screw 14b on the passage 12b side (right side in FIG. 1), the ball housing chamber 11 of the valve body 10 and the fluid passage 12b are screwed together. The inner cylinder 16 prevents the annular valve seat 20b inserted later (the right side in FIG. 1) from coming off, and the pair of annular valve seats 20a and 20b inserted into the valve body 10 and the ball 30. The positioning is made.
A water pipe (not shown) is connected to each of the fluid passages 12a and 12b formed in the valve body 10.
[0016]
The ball 30 is accommodated in the ball accommodating chamber 11 so as to be rotatable between the pair of annular valve seats 20a and 20b. A concave portion 31 is formed at the upper end of the ball 30, and one end of a valve rod 40 penetrating the peripheral wall of the valve body 10 is fitted into the concave portion 31, and the valve rod 40 is rotated by an electric actuator (not shown). As a result, the ball 30 rotates about the axis of the valve stem 40 as the rotation axis X.
[0017]
Further, the ball 30 is provided with a cylindrical through-hole 32 having a straight line Y perpendicular to the rotation axis X and passing through the center O of the ball 30 as a center line. The through-hole 32 acts as a passage that connects the pair of fluid passages 12a and 12b formed in the valve body 10 described above, and the ball 30 is rotated by the valve rod 40, whereby the through-hole 32 and the fluid passage are provided. The communication state with 12a and 12b changes, and fluid passages 12a and 12b are opened and closed.
[0018]
Opposite side end portions of both mouth edge portions 33a and 33b of the through-hole 32 of the ball 30, specifically, both of the through-holes 32 located on a horizontal plane including the straight line Y serving as the center line of the through-hole 32 Notch grooves 34a and 34b are formed in two side end portions of the four side end portions of the mouth edge portions 33a and 33b, respectively, as shown in FIG. The cutout grooves 34a and 34b are formed with a constant width.
[0019]
According to the ball valve 1 according to the present invention configured as described above, when it is necessary to set the opening of the valve in various states, as in the conventional ball valve, FIGS. When fully set to the fully open state shown in FIGS. 7A and 7B and the half-open state shown in FIGS. 7A and 7B, as well as to the minute valve open state shown in FIGS. 8A and 8B In the ball valve 1 according to the present invention, due to the presence of the notch grooves 34a and 34b formed in the ball 30, a very small amount is obtained as shown in FIG. 4 and FIGS. 5 (a) and 5 (b). The position of the ball 30 in the valve open state has a predetermined rotation width α determined based on the lengths of the cutout grooves 34 a and 34 b, and the presence of the rotation width α is a rotation error of the ball 30 or the like. The ball valve can be easily set even in a very small valve open state.
[0020]
Further, as in the ball valve 1 according to the embodiment of the present invention, when the cutout grooves 34a and 34b are formed in the cutout grooves 34a and 34b having a constant width, As shown in FIGS. 5 (a) and 5 (b), the ball valve can be easily finely adjusted to a very small valve open state within the range of the length of the cutout grooves 34a and 34b.
[0021]
Further, as in the ball valve 1 according to the above-described embodiment of the present invention, when the valve rod 40 for rotationally driving the ball 30 is structured to be connected to an electric actuator (not shown), the ball The ball valve can be electrically controlled to open and close the valve 1, and the opening of the valve can be easily set to various states including the above-described minute amount of valve open state.
[0022]
Although one embodiment of the ball valve according to the present invention has been described above, the present invention is not limited to the above-described embodiment, and the technical idea of the present invention, that is, “a ball that performs an opening / closing action”. A ball valve that has a notch groove and can be easily set to a very small valve open state. Naturally, various modifications and changes can be made within the scope of the technical idea.
[0023]
【The invention's effect】
According to the ball valve according to the present invention described above, the presence of the notch groove formed in the ball makes the position of the ball in a minute valve open state have a predetermined rotation width, and the minute valve open. There is an effect that it becomes a ball valve that can be easily set in a state.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an entire ball valve according to the present invention.
FIG. 2 is an exploded perspective view showing a ball and a valve stem of a ball valve according to the present invention.
3A and 3B are cross-sectional views showing a ball of a ball valve according to the present invention, where FIG. 3A is an overall view, and FIG. 3B is an enlarged view of a portion A.
FIG. 4 is a conceptual longitudinal sectional view showing a case where the ball valve according to the present invention is in a minute valve open state.
FIG. 5 is a conceptual side view showing a case where the ball valve according to the present invention is in a minute valve open state, where (a) shows a case where the ball is at an angle shown by a solid line in FIG. b) Each of the cases where the ball is at the angle indicated by the one-dot chain line in FIG.
6A and 6B are conceptual views showing a case where the ball valve is in a fully opened state, in which FIG. 6A is a longitudinal sectional view, and FIG. 6B is a side view.
7A and 7B are conceptual views showing a case where the ball valve is in a half-open state, in which FIG. 7A is a longitudinal sectional view, and FIG. 7B is a side view.
FIGS. 8A and 8B are conceptual diagrams showing a case where the ball valve is in a minute valve open state, where FIG. 8A is a longitudinal sectional view, and FIG. 8B is a side view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ball valve 10 Valve body 11 Ball storage chamber 12a, 12b Fluid passage 13 Receiving part 14a, 14b Female thread 15 Male thread 16 Inner cylinder 20a, 20b Annular valve seat 30 Ball 31 Recess 32 Through-hole 33a, 33b Edge part 34a, 34b Cutting Notched groove 40 Valve stem

Claims (3)

A valve body having a ball housing chamber and a pair of fluid passages provided on both sides thereof, a pair of annular valve seats disposed in the valve body, and a rotation axis between the pair of annular valve seats. A ball having a through hole that is rotatably accommodated in the ball housing chamber and is formed in a direction perpendicular to the rotation axis, and an upper end portion of the ball are connected, and the ball is rotated around the rotation axis. A ball valve comprising a valve rod for rotational driving, wherein each of the balls has a notch groove formed at each of opposite side edge portions of both mouth edges of the through hole. The ball valve according to claim 1, wherein the notch groove has a constant width. The ball valve according to claim 1, wherein the valve stem is connected to an electric actuator.

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