JPH11118047A - Ball valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate piping by eliminating the necessity of orientation of a ball valve in pipe connection and finishing to improve the sphericity of a ball and improve fluid control accuracy. SOLUTION: In a ball valve 10 wherein a ball 12 with a flow through hole 13 and a seal members 16 and 17 contacting both opening sides of this ball 12 are installed between the inlet side flow passage 11A and the outlet side flow passage 11B of a valve casing 11, and an operation handle 18 and the ball 12 are connected to each other through a valve rod 18A, both openings of the inflow side and outflow side of the flow through hole 13 of the ball 12 are made into a fan-like shape, and both of these fan-like shaped openings 14 and 15 are not symmetrical about the flow direction and are rotation symmetrical about the axis of the valve rod 18A, and the bottom section of the flow through hole 13 between the inflow and outflow side openings are opened facing downward, and the axis center of this opening section 19 and the axis center of the valve rod 18A and cocenteric with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ball valve.

[0002]

2. Description of the Related Art As a conventional ball valve, for example, in Japanese Utility Model Publication No. 3-29656 and Japanese Utility Model Laid-Open Publication No. 4-62969, a ball having a flow hole between an inlet channel and an outlet channel of a valve box is disclosed. A seal member that comes into contact with each of the two opening sides of the ball is attached, the electric actuator and the ball are connected via a valve rod, the opening on the inflow side of the passage hole of the ball is circular, and the opening on the outflow side is formed. Is described as a fan shape.

According to this ball valve, the ball is 90
By fully turning the valve, the valve can be fully opened or closed, and the opening and closing operation can be performed quickly and easily without the necessity of turning the handle several times to several tens of times unlike the gate valve. Further, by forming two sides intersecting at the tip of the fan-shaped opening into a convex curve bulging in the direction of the center line of the opening, the flow rate characteristics are equal percentage characteristics (the increase rate of the flow rate is the same as the valve opening degree. The flow characteristics are made linear by changing the two sides into a fan-shaped curve with respect to the center line of the opening (the flow is changed in direct proportion to the valve opening). 107165).

[0004]

However, in the above-mentioned ball valve, the opening on the inflow side of the ball is circular, while the opening on the outflow side is fan-shaped. There is a problem that the pipes are restricted and piping workability is deteriorated. In other words, in the ball valve before the improvement, since the openings on the inflow side and the outflow side of the ball are both circular, there is no problem in use, regardless of which of the inflow side and the outflow side is used for pipe connection. On the other hand, when the openings on the inflow side and the outflow side of the ball are different from each other, connecting the pipes in opposite directions will cause an obstacle to the flow rate characteristics.

[0005] In addition, since the opening on the inflow side and the opening on the outflow side of the ball have different shapes, the pressure received by the two ball sheets in contact with the ball differs between the inflow side and the outflow side.
As a result, in particular, the durability of the ball seat on the outflow side is reduced, and the ball seat must be replaced with a new one somewhat more frequently than the ball valve before the improvement described above, and the maintenance cost increases. There was a problem. The ball sheet generally used is made of polytetrafluoroethylene resin and is expensive.

The above problem can be solved by making the openings on the inflow side and the outflow side of the ball both fan-shaped. However, the following problem newly arises. By the way, in order to increase the sphericity of the ball, the outer surface of the ball is usually finish-cut. In the case of a conventional ball having a circular opening on the inflow side, for example, one end of a rotating shaft of a machining lathe is fitted and fixed in the circular opening, and the outer surface of the ball is cut with a cutting bit while rotating. To perform spherical finishing. However, if the openings on the inflow side and the outflow side are both sector-shaped, it is impossible to fit and fix one end of the rotating shaft of the machining lathe into the sector-shaped opening, and it is difficult to finish the outer surface of the ball. Becomes

Further, both the fan-shaped openings on the inflow side and the outflow side of the flow hole of the ball are asymmetrical with respect to the flow path direction, and these fan-shaped openings are rotationally symmetric with respect to the axis of the valve stem. In this case, a weir is formed between the inflow side and the outflow side of the flow hole, and there is a problem that the diameter of the flow path is reduced at this portion.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an excellent pipe workability with no directivity at the time of pipe connection, to improve fluid control accuracy, and to easily perform finishing work for increasing the sphericity of a ball. The object of the present invention is to provide a ball valve.

[0009]

According to a first aspect of the present invention, there is provided a ball having a flow hole between an inlet-side flow path and an outlet-side flow path of a valve box, and a ball provided at both opening sides of the ball. In a ball valve in which a sealing member that comes into contact is mounted and the operating portion and the ball are connected via a valve rod, both the inflow side and the outflow side openings of the flow holes of the ball are fan-shaped. Both the fan-shaped openings are asymmetrical with respect to the flow path direction, and both fan-shaped openings are rotationally symmetric with respect to the axis of the valve stem, and the bottom of the flow hole between the inflow-side opening and the outflow-side opening is formed. It is opened downward, and the axis of this opening is concentric with the axis of the valve stem.

According to a second aspect of the present invention, in the ball valve according to the first aspect, when the valve is fully closed, the sharp ends of the two fan-shaped openings are formed by the inflow-side and outflow-side seal members immediately adjacent to the inlet flow path and the outlet flow path. In addition to being set in the first seal area, when the valve is fully opened, the sharp ends of both fan-shaped openings cross the inlet flow path and the outlet flow path and enter the second seal area formed by the inflow-side and outflow-side seal members. It is set.

According to a third aspect of the present invention, there is provided the ball valve according to the first or second aspect, wherein the flow hole of the ball has an in-valve flow path that is convex toward the inside. is there.

(Function) In the present invention according to the first aspect, the openings on the inflow side and the outflow side of the ball flow hole are both fan-shaped, and both fan-shaped openings are asymmetrical with respect to the flow path direction. In addition, since the two fan-shaped openings are rotationally symmetric with respect to the axis of the valve stem, there is no directivity at the time of pipe connection, so that pipe workability is excellent and fluid control accuracy is improved.

The bottom of the passage hole between the inflow opening and the inflow opening is opened downward, and the axis of the opening is concentric with the axis of the valve stem. By fitting and fixing one end of the rotating shaft of the machining lathe to the finish, the outer surface of the ball can be finished with high productivity.

According to the second aspect of the present invention, when the valve is fully closed, the pointed ends of the two fan-shaped openings are set in the first sealing area formed by the inflow-side and outflow-side seal members immediately near the inlet flow path and the outlet flow path. And, when the valve is fully opened, it is set so that the pointed ends of both fan-shaped openings cross the inlet flow path and the outlet flow path and enter the second sealing region by the inflow-side and outflow-side seal members. The effective rotation angle range of the ball whose opening is connected to the inlet channel and the outlet channel is relatively large, and the fluid control band by the operation unit is widened. Since the control band of the flow rate is widened by the shape of the fan-shaped opening, the resolution of the operation unit is not affected, and the accuracy of the flow rate control is improved.

According to the third aspect of the present invention, since the flow hole of the ball has an in-valve flow path protruding toward the inside thereof, the flow velocity in the valve when the valve is fully opened has a large flow velocity. On the side where と is set, the valve capacity coefficient (Cv value) is increased by suppressing the occurrence of turbulence due to the separation of the flow from the valve internal flow path, and a large flow rate can be secured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the ball valve of the present invention will be described with reference to the drawings. 1 is a schematic sectional view showing a first embodiment of a ball valve, FIG. 2 is a right side view of FIG. 1, FIG. 3 is a left side view of FIG. 1, FIG. 4 is a front view of a ball corresponding to FIG. Is a front view of the ball corresponding to FIG. 3, and FIG.
7 is a sectional view taken along the line YY of FIG. 4, FIG. 8 is a sectional view taken along the line ZZ of FIG. 6, and FIG. 9 is an explanatory view showing the open / closed state of the ball valve of FIG.

As shown in FIG. 1, the ball valve 10 has a ball 12 having a flow hole 13 between an inlet channel 11A and an outlet channel 11B of a valve box 11, and both openings 14, 15 of the ball 12. Sealing members 16 and 17 contacting each other
Is installed. The operation handle 18 and the ball 12 are connected via a valve stem 18A. In addition, 2
0 is a ball hold. As shown in FIGS. 2 to 5, the opening 14 on the inflow side of the flow hole 13 of the ball 12 is a fan-shaped opening, and the opening 15 on the outflow side is also a fan-shaped opening 1 on the inflow side.
4 is a fan-shaped opening having the same shape as that of FIG. Ball valve 1
0 is made of a hard vinyl chloride resin.

The two fan-shaped openings 14 and 15 are shown in FIGS.
As is clear from FIG. 7, both are asymmetrical with respect to the flow path direction, and as is clear from FIG.
It is rotationally symmetric with respect to the axis of A. At the bottom of the flow hole 13 between the inflow side fan-shaped opening 14 and the outflow side fan-shaped opening 15, a circular opening 19 is opened downward, through which the flow hole 13 is connected to the valve chamber 1C. Communicating.
The axis of the opening 19 is concentric with the axis of the valve stem 18A.

The ball valve 10 has a flow passage 13 formed in the ball 12 so that the flow passage hole 13 of the ball 12 smoothly connects the fan-shaped opening 14 and the fan-side opening 15 with a tapered flow surface 13A. The flow path surface has a convex shape toward the inside of the flow hole 13.

The ball 12 is, as shown in FIGS.
As an opening on the inflow side of the flow hole 13 of the ball 12, in addition to the fan-shaped opening 14, a hole-shaped auxiliary opening 14 </ b> C which is isolated from the fan-shaped opening 14 in the rotation circumferential direction of the ball 12 is provided. This auxiliary opening 14C is, as shown in FIG.
When the pointed end 14A starts to open the valve passing through the first sealing region, the inlet flow path 11A is communicated with the flow hole 13. Then, the fan-shaped opening 14 allows the inlet flow passage 11A to communicate with the flow hole 13 after the start of the valve opening.

When the ball valve 10 is fully closed, as shown in FIG. 9A, the pointed end (extended portion) 15A of the fan-shaped opening 15 is formed by the outflow-side sealing member 17 immediately adjacent to the outlet flow path 11B. It is set to be located in the first seal area 17A. In addition, the pointed end (extended portion) 14A of the fan-shaped opening 14 is set so as to be located in the first sealing area 16A of the inflow-side sealing member 16 in the immediate vicinity of the inlet channel 11A.

On the other hand, when the valve is fully opened, as shown in FIG. 9D, the pointed end 15A of the fan-shaped opening 15 crosses the outlet flow path 11B and enters the second sealing area 17B formed by the outflow-side sealing member 17, The large end 15B of the fan-shaped opening 15 does not enter the outlet flow path 11B,
And the fan-shaped opening 15 is set so as to be widely opened in the entire range of the outlet flow path 11B in the rotation circumferential direction of the ball 12.

The pointed end 14A of the fan-shaped opening 14 crosses the inlet flow path 11A and the second end of the second opening
And the large end 14B of the fan-shaped opening 14 does not enter the inlet flow path 11A, but matches the peripheral edge of the inlet flow path 11A. The fan-shaped opening 14 is set so as to open widely in the entire area of the road 11A.

The operation of the first embodiment will be described below. When the valve is fully closed, the pointed end 15A of the fan-shaped opening 15 is in the first sealing area 17A formed by the outflow-side sealing member 17 in the immediate vicinity of the outlet flow path, and the pointed end 14A of the fan-shaped opening 14 is in the inflow-side seal in the immediate vicinity of the inlet flow path. The first seal area 16A is set by the member 16. Therefore, after the valve is opened by the operation unit 18, the floating range from the pointed end 15A of the fan-shaped opening 15 to the outlet channel 11B passing through the seal member 17 is short, and the fluid starts to flow quickly.

In the ball valve 10, at the start of valve opening, the pointed end 15 A of the fan-shaped opening 15 on the outflow side is connected to the outlet channel 1.
1B, on the small flow rate side communicating with the fan-shaped opening 1 on the inflow side.
The four pointed ends 52A communicate with the inlet channel 11A. Also,
At the fully open side, the large end 15B of the fan-shaped opening 15 on the outflow side coincides with the peripheral edge of the outlet flow path 11B, so that the fan-shaped opening 15 is widely opened over the entire area of the outlet flow path 11B. The large end 14B of the fan-shaped opening 14 of the
The fan-shaped opening 14 is widened over the entire area of the inlet flow path 11A in conformity with the peripheral portion of 1A.

When the valve is fully opened, the tip 15A of the fan-shaped opening 15
Crosses the outlet flow path 11B into a second seal area 17B formed by the outflow-side seal member 17, and the pointed end 14A of the fan-shaped opening 14 crosses the inlet flow path 11A and forms a second seal area formed by the inflow-side seal member 16. 16B, the effective rotation angle range of the ball 12 in which the fan-shaped opening 15 is connected to the outlet flow path 11B is relatively large, and the fluid control band by the operation handle 18 is widened.

Since the flow control band is widened by the shape of the fan-shaped opening 15, the resolution of the operation handle 18 is not affected, and the flow control accuracy is improved. Further, since the inner surface of the flow passage 13 of the passage hole 13 between the fan-shaped opening 14 and the fan-shaped opening 15 is smoothly connected to the tapered flow surface 13A, the flow resistance of the valve is reduced.

Since the two sides a and b intersecting at the pointed end 15A of the fan-shaped opening 15 are convex curves bulging in the direction of the center line of the opening, the flow rate characteristics are equal percentage characteristics (increase in the same amount as the valve opening). With the same rate of increase in flow rate)
It becomes what has.

Since the axis of the circular opening 19 is concentric with the axis of the valve stem 18A, one end of the rotary shaft of the working lathe is fitted and fixed in this opening 19, and the outer surface of the ball is fixed. Finishing can be performed.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and there are design changes within the scope of the present invention. This is also included in the present invention. In order to prevent liquid pool in the valve chamber 11C, a hole-shaped or slit-shaped communication path may be provided on the fan-shaped opening 14 side or the fan-shaped opening 15 side of the ball 12. In this way, it can be suitably used for fluid control of pure water / ultra pure water piping in a semiconductor field or the like.

The two sides a and b intersecting at the pointed end 15A of the fan-shaped opening 15 may be formed as a concave curve with respect to the center line of the opening. With such a concave curve, it is possible to have a linear flow rate characteristic in which the flow rate changes in direct proportion to the valve opening.

Further, in the above embodiment, the valve stem 53
Although the operation handle 53 is connected to the ball 51 via A, an electric actuator may be used instead of the operation handle.

[0033]

According to the first aspect of the present invention, both the fan-shaped openings of the passage hole of the ball are asymmetrical with respect to the direction of the flow path, and the fan-shaped openings are formed on the axis of the valve stem. Since it is rotationally symmetrical, there is no directionality at the time of pipe connection, so that pipe workability is excellent and fluid control accuracy is improved.

The axis of the opening formed at the bottom of the flow hole between the two fan-shaped openings is concentric with the axis of the valve stem. By fitting and fixing one end of the ball, the outer surface of the ball can be finished with high productivity.

According to the second aspect of the present invention, when the valve is fully closed, the sharp ends of the two fan-shaped openings are set in the first sealing area formed by the inflow-side and outflow-side seal members in the immediate vicinity of the inlet flow path and the outlet flow path. When the valve is fully open,
Since the pointed ends of the two fan-shaped openings are set so as to cross the inlet flow path and the outlet flow path and enter the second sealing area formed by the inflow-side and outflow-side seal members, the ball connecting the fan-shaped opening to the outlet flow path Has a relatively large effective rotation angle range, and the fluid control band by the operation unit is wide.

According to the third aspect of the present invention, since the flow hole of the ball has an in-valve flow path protruding toward the inside thereof, the flow velocity in the valve when the valve is fully opened is large flow velocity. On the side where the valve capacity coefficient (Cv value) is increased, for example, by suppressing the occurrence of turbulence due to the separation of the flow from the valve internal flow path,
Large flow rate can be secured.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is a front view of a ball corresponding to FIG. 2;

FIG. 5 is a front view of a ball corresponding to FIG. 3;

FIG. 6 is a sectional view taken along line XX of FIG. 4;

FIG. 7 is a sectional view taken along line YY of FIG. 4;

FIG. 8 is a sectional view taken along the line ZZ of FIG. 6;

FIG. 9 is an explanatory diagram showing an open / closed state of the ball valve of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ball valve 11 Valve box 11A Inlet flow path 11B Outlet flow path 11C Valve room 12 Ball 13 Flowing hole 14, 15 Fan opening 14C Auxiliary opening 14A, 15A Pointed end 16, 17 Seal member 16A, 17A First seal area 16B , 17B Second sealing area 18 Operating handle 18A Valve stem

Claims (3)

[Claims] 1. A method according to claim 1, further comprising the step of:
In a ball valve, a ball having a flow hole and a seal member that comes into contact with both opening sides of the ball are mounted, and an operation unit and the ball are connected via a valve rod. Both the inflow-side and outflow-side openings are fan-shaped, and both fan-shaped openings are left-right asymmetric with respect to the flow path direction, and both fan-shaped openings are rotationally symmetric with respect to the axis of the valve stem, A ball valve characterized in that the bottom of a flow hole between an inflow side opening and an outflow side opening is opened downward, and the axis of this opening is concentric with the axis of a valve stem. 2. When the valve is fully closed, the pointed ends of both fan-shaped openings are set in the first sealing area by the inflow-side and outflow-side seal members immediately adjacent to the inlet flow path and the outlet flow path. 2. The ball valve according to claim 1, wherein the pointed end of the fan-shaped opening is set so as to cross the inlet flow passage and the outlet flow passage and to enter the second sealing region formed by the inflow-side and outflow-side seal members. 3. The ball valve according to claim 1, wherein the flow hole of the ball has an in-valve flow path protruding inward.