JP2006200704A - Ball valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the ball valve that can remove a connection sleeve by preventing the turning together of a ball retainer when removing a union nut and prevent the pop out of a ball. <P>SOLUTION: In the ball valve that a flanged short pipe 4 is arranged and contacted on outside end of the ball retainer 3 that the ball valve 2 to open and close the flow channel in a valve body 1 is arranged so as to be turnable and a sheet 14 is provided so as to be pressed to the ball valve 2 by the ball retainer 3, making a cap nut 5 engage with a flange part 17 of the flanged short pipe 4 and screw to the end of the valve body 1, at least one convex part 22 or one recessed part 9 is provided with an end part of the valve body 1 at least and the ball retainer 3 is screwed to the end of the inner circumference and an engaged part 18 to engage the convex part 22 or the recessed part 9 is provided to the end part of the flanged short pipe 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a ball valve used in piping lines of various industries such as chemical factories, water and sewage, agriculture / fishery industry, semiconductor manufacturing field, and food field, and more specifically, when a cap nut is removed. Concerning a ball valve that can prevent the ball valve body from popping out during piping by preventing rotation of the short tube with hooks along with the rotation of the nut to prevent the ball presser from co-rotating and removing the short tube with hooks It is.

  Conventionally, there has been a ball valve as shown in FIG. 11 (see, for example, Patent Document 1). In this ball valve, a ball 102 capable of opening and closing the flow path is disposed in the valve body 101, and a ball sheet 103 is brought into contact with the ball 102 from both sides of the flow path. The ball retainer 106 provided with the provided male screw 105 is pressed toward the ball 102 by being screwed into the female screw 104 provided on the inner peripheral surface of the valve body 101. Further, a union nut 108 is screwed onto a male screw 107 on the outer periphery of the end portion of the valve body 101, and the union nut 108 causes the flange portion 110 of the connection sleeve 109 to pass through an O-ring 111 installed on the end surface of the ball retainer 106. It is fixed so as to be pressed toward the presser 106. In such a ball valve, the inner diameter of the downstream end of the valve main body 101 is smaller than the inner diameter of the upstream end, while the ball retainer is screwed to the inner peripheral surface of the downstream end of the valve main body 101. The outer diameter of 106 was made smaller than the outer diameter of the ball retainer 106 screwed onto the inner peripheral surface of the upstream end. The effect is that the downstream end portion thickness of the valve body 101 is thicker than the upstream end portion thickness, so that the mechanical strength of the downstream end portion of the valve body 101 is improved.

JP 2001-254850 A

  However, in the conventional ball valve, even when the connection sleeve 109 rotates with the rotation of the union nut 108 when the union nut 108 is removed, even if the ball presser 106 rotates together, it cannot be suppressed. That is, when the ball valve being piped is closed, the upstream side of the ball 102 in the valve body 101 is in a state where fluid pressure is applied, and in this case, particularly when the lubricating oil is not sufficiently applied to the O-ring 111. When the pipe connected to the connection sleeve 109 is repaired or replaced in an oil-free ball valve to which no lubricant is applied, the downstream union nut 108 is removed and the downstream connection sleeve 109 is removed. When the union nut 108 is rotated in the removing direction, the connection sleeve 109 may also rotate with the rotation of the union nut 108. Further, as the connection sleeve 109 rotates, the ball presser 106 also rotates together due to the frictional resistance with the O-ring 111, and when the union nut 108 is removed, the ball presser 106 may be removed from the valve body 101 at the same time. . At this time, there is a problem that the ball 102 is pushed out by the fluid pressure applied to the upstream side of the ball 102 in the valve body 101 and the fluid flows out.

  The present invention has been made in view of the above-described problems of the prior art. When the union nut 108 is removed, the ball retainer 106 can be prevented from rotating together, and the connection sleeve 109 can be removed. It is an object of the present invention to provide a ball valve that prevents popping out.

  The configuration of the valve of the present invention for solving the above problems will be described with reference to FIGS. 1 to 5 and 7. A ball valve body 2 for opening and closing a flow path is disposed in the valve body 1 so as to be rotatable. The seat 14 is provided so as to be pressed against the ball valve body 2 by the ball presser 3, and the cap nut 5 is engaged with the flange portion 17 of the flanged short tube 4 and screwed to the end portion of the valve body 1. Thus, in the ball valve in which the flanged short tube 4 is disposed in contact with the outer end of the ball retainer 3, at least one end portion of the valve body 1 has at least one convex portion 22 or the concave portion 9, and the inner periphery of the end portion The ball retainer 3 is screwed together, and the engagement portions 18 and 24 that engage with the convex portion 22 or the concave portion 9 of the valve body 1 are provided at the end of the flange portion 17 of the flanged short tube 4. One feature.

  A second feature is that a plurality of convex portions 22 or concave portions 9 of the valve body 1 are provided at equal intervals over the entire circumference of the end portion of the valve body 1.

  A third feature is that the convex portion 22 or the concave portion 9 of the valve body 1 is provided in a sawtooth shape (see FIG. 5) over the entire circumference of the end portion of the valve body 1.

  Further, a ball valve body 32 for opening and closing the flow path is rotatably disposed in the valve body 30 so that the seat is pressed against the ball valve body 32 by the ball presser 33, and the cap nut 34 is shortened with a hook. In the ball valve in which the flanged short tube 31 is disposed in contact with the outer end of the ball retainer 33 by being engaged with the flange portion 36 of the tube 31 and screwed into the end portion of the valve body 30, the valve body 30 A fourth feature is that fine irregularities 35 and 37 are provided on at least one end face of the end face and the end face of the flanged short tube 31.

  Furthermore, a fifth feature is that the ball valve body 2 is rotated by manual, pneumatic, or electric drive.

  In the present invention, the number of convex portions 22 or concave portions 9 of the valve body 1 may be one or plural, and the convex portions 22 or concave portions 9 are equally spaced over the entire circumference of the end portion of the valve body 1. A plurality of them may be provided. By providing a plurality of convex portions 22 or concave portions 9 at equal intervals over the entire circumference of the end portion of the valve body 1, the engagement with the convex portions 22 or the concave portions 9 when the valve body 1 and the flanged short tube 4 are engaged. This is preferable because it is not necessary to worry about the position where the joint portions 18 and 24 are aligned, and the assembly becomes easy.

  Moreover, the shape of the convex part 22 or the recessed part 9 of the valve body 1 and the engaging parts 18 and 24 of the flanged short tube 4 is not particularly limited as long as the valve body 1 and the flanged short tube 4 can be engaged with each other. The valve body 1 may be provided with either the convex portion 22 or the concave portion 9 or both. For example, as shown in FIG. 1, the valve body 1 may be provided with a recess 9, and the flanged short tube 4 may be provided with a convex engagement portion 18 that engages with the recess 9, as shown in FIG. 4. In this manner, the convex portion 22 may be provided on the valve body 21 and the concave engaging portion 24 that engages the convex portion 22 may be provided on the flanged short tube 23.

  Further, as shown in FIG. 5, a protrusion 26 having a sawtooth shape is provided on the entire circumference of the end of the valve body 25, and a sawtooth-like protrusion 27 is engaged with the flanged short tube 27. The structure provided with the engaging part 28 may be sufficient. In this case, when engaging the valve main body 25 and the flanged short tube 27, there is no need to worry about the position where the projection 26 and the engagement portion 28 are aligned, and assembly is facilitated. Further, when repairing or replacing the pipe connected to the flanged short tube 27, when removing the downstream cap nut 29 and removing the downstream flanged short tube 27, the cap nut 29 is removed. When the cap nut 29 is rotated, the flanged short tube 27 also attempts to rotate. However, the protrusion 26 and the engaging portion 28 are engaged to prevent the rotation of the flanged short tube 27. Co-rotation of the ball presser 3 is prevented. Further, when the flanged short tube 27 rotates with the rotation of the cap nut 29, the tapered surfaces of the protrusion 26 and the engaging portion 28 are pressed in the rotation direction and slide to slide against the valve body 25. When the short tube 27 is slightly separated, the flanged short tube 27 is also separated from the ball retainer 3, so that the co-rotation of the ball retainer 3 is more reliably prevented. For this reason, it is preferable to provide the sawtooth-shaped protrusion 26 over the entire circumference of the end of the valve body 1.

  Further, the ball valve of the present invention may be one in which the ball presser 3 is screwed into only one of the end portions of the valve body 1 as shown in FIG. 2, and is screwed into both end portions as shown in FIG. Things can be used. When the ball retainer 3 is screwed only to one end portion of the valve body 1, the convex portion 22 or the concave portion 9 of the valve main body 1 is provided at one end portion of the valve main body 1 and screwed to both end portions. In this case, the convex portion 22 or the concave portion 9 is provided at both end portions of the valve body 1.

  7 and 8, the ball valve of the present invention may have a configuration in which fine irregularities 35 and 37 are provided on the end surface of the valve body 30 and the end surface of the flanged short tube 31. You may provide only in either one of the short surface of this and the end surface which the short tube 31 with a flange contacts. The shape of the fine irregularities 35 and 37 is not particularly limited, such as a grain shape, a line shape, a shape by embossing, a shape roughened with sandpaper or the like. The fine irregularities 35 and 37 may be provided only at one end of the valve body 30 or at both ends.

  Furthermore, the same is true not only in the two-way ball valve of the present invention but also in the three-way and multi-way ball valves.

  The ball valve according to the present invention is driven mainly by a manual method, but it may be driven by an air pressure method (see FIG. 9) by an air pressure or an electric method (see FIG. 10) by a motor, and is not particularly limited. In the case of the pneumatic type and the electric type, instead of the handle 11 of the ball valve, a pneumatic driving unit 40 and an electric driving unit 42 are mounted via mounting bases 41 and 43, respectively, and conducted to the upper part of the stem 7. .

  In the present invention, the valve body 1 and the ball retainer 3 and the cap nut 5 are joined by screws. However, if they are screws, each part can be easily molded and processed, and parts with good dimensional accuracy are obtained. In addition, it is preferable because the force with which the ball retainer 3 presses the seat 14 toward the ball valve body 2 can be adjusted by adjusting the screw tightening.

  The material of the valve body 1, the ball valve body 2, the ball press 3, the flanged short tube 4 and the cap nut 5 of the ball valve of the present invention is often made of vinyl chloride resin (hereinafter referred to as PVC). As long as the required strength and properties are satisfied, there are no particular limitations on synthetic resins such as polypropylene, polyethylene, polyvinylidene fluoride, and polyphenylene sulfide, or metals such as copper, cast iron, and cast steel.

The present invention has the structure as described above, and the following excellent effects can be obtained.
(1) At least one convex portion or concave portion is provided at at least one end portion of the valve body, and an engaging portion that engages with the convex portion or concave portion of the valve main body is provided at the flange end portion of the flanged short tube. Therefore, when the pipe connected to the connection sleeve is repaired or replaced, the cap nut is removed when the piped ball valve is closed, that is, with the fluid pressure on the upstream side. When the cap nut is removed, the convex part or concave part and the engaging part are engaged with the rotation of the cap nut. , The ball valve body is prevented from popping out and the fluid does not flow out.
(2) Since the convex portion or concave portion of the valve body is provided in a sawtooth shape over the entire circumference of the end portion of the valve body, assembly is facilitated, and the sawtooth projection and the engaging portion are engaged. This prevents rotation of the flanged short tube, and when the flanged end tube rotates as the cap nut rotates, the taper surfaces of the protrusion and the engaging portion are pressed in the rotation direction and slide to slide against the valve body. Since the short tube with the flange is slightly separated, the ball presser can be prevented from co-rotating and the ball presser is not removed, so that the ball valve body is prevented from popping out and the fluid does not flow out.
(3) At least one of the end face of the valve body and the end face of the flanged short pipe is provided with fine irregularities so that fluid pressure is applied when the ball valve being piped is closed, that is, upstream. Even if you remove the cap nut and remove the short tube with, the frictional force of the contact surface with fine irregularities against the rotation of the cap nut becomes very large, preventing the rotation of the short tube with a hook. Therefore, the ball presser is prevented from co-rotating and the ball presser is not released, so that the ball valve body is prevented from popping out and fluid does not flow out.
(4) Secondary damage can be prevented by suppressing the ball valve body from popping out.

  Hereinafter, embodiments of the present invention will be described with reference to the embodiments shown in the drawings. However, it is needless to say that the present invention is not limited to the embodiments. FIG. 1 is a front view showing a state where a cap nut and a flanged short pipe are removed from a ball valve according to a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the ball valve according to the first embodiment of the present invention when fully closed. FIG. 3 is a front view of the ball valve showing a state in the middle of removing the cap nut of FIG. FIG. 4 is an enlarged front view of the main part of the ball valve showing a state in which the cap nut and the flanged short tube are removed in a configuration in which a convex portion is provided at the end of the valve body. FIG. 5 is an enlarged front view of the main part of the ball valve showing a state in which the cap nut and the flanged short tube are removed in a configuration in which a serrated convex portion is provided at the end of the valve body. FIG. 6 is a vertical cross-sectional view of a ball valve showing a configuration in which ball retainers are provided at both ends of the valve body. FIG. 7 is an enlarged front view of an essential part showing a state where a cap nut and a flanged short pipe of the ball valve according to the second embodiment of the present invention are removed. FIG. 8 is a longitudinal sectional view of the ball valve according to the second embodiment of the present invention when fully closed. FIG. 9 is a partial cross-sectional view of a ball valve showing a configuration by a pneumatic drive according to the first embodiment. FIG. 10 is a partial cross-sectional view of a ball valve showing a configuration by electric driving according to the first embodiment.

  Hereinafter, the ball valve according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

  Reference numeral 1 denotes a PVC valve body having a diameter of 25 mm. The valve main body 1 has a substantially hollow cylindrical shape and is provided with a valve chamber 6 therein. A through hole into which the stem 7 is inserted is provided so as to communicate with the valve chamber 6 in a direction intersecting with the flow path axis. The outer periphery of both ends of the valve body 1 is provided with a male threaded portion 8, a recess 9 is provided at one end of the valve body 1 at equal intervals over the entire circumference, and a female threaded portion 10 is provided at the inner periphery of the end portion. Is provided.

  2 is a ball valve body made of PVC. The ball valve body 2 is disposed in the valve chamber 6 of the valve body 1 and is fitted to a lower end portion of a stem 7 having a handle 11 fitted on the upper portion thereof. In particular, when the ball valve that is piped is fully closed, that is, when the fluid pressure is applied to the upstream side, the ball valve is fitted in a state of being slightly movable to the downstream side.

  3 is a PVC ball retainer. The ball retainer 3 has a cylindrical shape, and an O-ring 12 is provided on the outer periphery, and a male screw portion 13 that is screwed onto the female thread portion 10 of the valve body 1 is provided on the outer periphery. The ball valve body 2 is pressed and held by the seat 14 from both sides of the flow path in the valve chamber 6. An O-ring 15 is disposed on the end surface of the ball retainer 3 on the side where the male thread portion 13 is provided.

  4 is a PVC short tube with a flange. The flanged short tube 4 is provided with a flange portion 17 at one end of the short tube portion 16, and a protruding engagement portion 18 that engages with the recess portion 9 of the valve body 1 extends over the entire periphery of the flange portion end portion. It is provided at equal intervals.

  5 is a PVC cap nut. The cap nut 5 has a cylindrical shape, and is provided with an internal thread portion 19 that is screwed to the external thread portion 8 of the valve body 1 on the inner periphery of one end portion, and protrudes toward the inner peripheral side at the other end portion. An annular ridge 20 is provided. The cap nut 5 engages the annular protrusion 20 with the flange 17 of the flanged short tube 4 and is screwed to the valve body 1 to hold the ball-mounted short tube 4 via the O-ring 15. 3 is fixed to the end face.

  Next, the operation when the ball valve of the first embodiment of the present invention is opened and closed will be described. When the handle 11 is rotated 90 degrees from the closed state of FIG. 2, the stem 7 fitted to the handle 11 rotates, and the ball valve body fitted to the stem 7 in accordance with the rotation of the stem 7. 2 is rotated 90 degrees to open the ball valve.

  Next, in the case where the ball valve according to the first embodiment of the present invention is not coated with lubricant on the O-ring 15, that is, in the state where the oil-free valve is piped, the downstream short flange 4 The operation of removing the cap nut 5 and removing the flanged short pipe 4 when repairing or exchanging a pipe (not shown) connected to will be described with reference to FIGS. At this time, the flow direction of the fluid is the arrow direction in the figure.

  When the ball valve is closed, that is, when the fluid pressure is applied to the valve body 1 on the upstream side (left side in FIG. 2), the cap nut 5 is rotated in the direction to remove the cap nut 5 on the downstream side (right side in FIG. 2). 5, the flanged short tube 4 tries to rotate due to friction between the inner end surface of the annular ridge 20 and the outer end surface of the flange portion 17, but the engagement portion between the concave portion 9 of the valve body 1 and the flanged short tube 4. Since 18 is engaged, rotation of the flanged short tube 4 is prevented (see FIG. 3). Since the rotation of the flanged short tube 4 is prevented, the ball presser 3 pressed through the O-ring 15 does not rotate, and co-rotation is prevented. Then, by removing the valve main body 1 and the flanged short tube 4, it is possible to remove the flanged short tube 4 without rotating the ball retainer 3 together (the state of FIG. 1).

  From the above, the cap nut 5 is removed when the cap nut 5 is removed and the flanged short tube 4 is removed, such as when repairing or replacing a pipe (not shown) connected to the flanged short tube 4 on the downstream side. Therefore, the ball retainer 3 is reliably prevented from rotating together with the rotation of the ball retainer 3 and the ball retainer 3 does not come off the valve body 1. Therefore, the ball valve body 2 is completely prevented from popping out, and no fluid flows out.

Hereinafter, a ball valve according to a second embodiment of the present invention will be described with reference to FIGS. 4 and 5.

  Reference numeral 30 denotes a PVC valve body having a diameter of 25 mm. On one end face of the valve body 30, fine irregularities 35 are provided over the entire circumference.

  31 is a PVC short tube with a flange. On the end face of the flange portion 36 of the flanged short tube 31, fine irregularities 37 are provided at equal intervals over the entire circumference.

  32 is a ball valve body made of PVC, 33 is a ball presser made of PVC, and 34 is a cap nut made of PVC. Since the other structure and operation | movement of 2nd embodiment of this invention are the same as that of 1st embodiment, description is abbreviate | omitted.

  Next, in the ball valve according to the second embodiment of the present invention, when the lubricant is not applied to the O-ring 38, a pipe (not shown) connected to the downstream short flanged pipe 31 is repaired or The action of removing the flanged short pipe 31 by removing the cap nut 34 when exchanging will be described with reference to FIGS. At this time, the flow direction of the fluid is the arrow direction in the figure.

  When the ball valve is closed, that is, when the fluid pressure is applied to the upstream side (left side in FIG. 8), the downstream side (right side in FIG. 8) cap nut 34 is rotated to remove the cap nut 34. With the rotation of 34, the flanged short tube 31 tends to rotate due to friction between the inner end surface of the annular protrusion 39 and the outer end surface of the flange 36. Rotation of the flanged short tube 31 is prevented by the engagement of the fine irregularities 37 on the end surface of the flange portion or the frictional force of the contact surface becoming very large. Since the rotation of the flanged short tube 31 is prevented, the ball presser 33 pressed through the O-ring 38 does not rotate, and co-rotation is prevented. Then, by removing the valve main body 30 and the flanged short tube 31, it is possible to remove the flanged short tube 31 without rotating the ball retainer 33 together (the state of FIG. 7).

  From the above, when the pipe nut (not shown) connected to the downstream flanged short tube 31 is repaired or replaced, the cap nut 34 is removed when the cap nut 34 is removed and the flanged short tube 31 is removed. The ball holder 33 is prevented from rotating together with the rotation, and the ball holder 33 is not detached from the valve main body 30. Therefore, the ball valve body 32 is completely prevented from jumping out, and no fluid flows out.

It is a front view which shows the state which removed the cap nut and the flanged short pipe of the ball valve of 1st embodiment of this invention. It is a longitudinal cross-sectional view of the ball valve of the first embodiment of the present invention when fully closed. It is a front view of the ball valve which shows the state in the middle of removing the cap nut of FIG. It is a principal part enlarged front view of the ball valve which shows the state which removed the cap nut and the flanged short tube in the structure by which the convex part was provided in the edge part of the valve body. It is a principal part enlarged front view of the ball valve which shows the state which removed the cap nut and the flanged short tube in the structure by which the serrated convex part was provided in the edge part of the valve body. It is a longitudinal cross-sectional view of the ball valve which shows the structure by which the ball | bowl presser was provided in the both ends of the valve main body. It is a principal part enlarged front view which shows the state which removed the cap nut and the flanged short tube of the ball valve of 2nd embodiment of this invention. It is a longitudinal cross-sectional view at the time of full closure of the ball valve of a second embodiment of the present invention. It is a fragmentary sectional view of the ball valve which shows the composition by the pneumatic drive by a first embodiment. It is a fragmentary sectional view of the ball valve which shows the composition by the electric drive by a first embodiment. It is a longitudinal cross-sectional view which shows the conventional ball valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Valve body 2 ... Ball valve body 3 ... Ball presser 4 ... Short pipe 5 with a hook ... Cap nut 6 ... Valve chamber 7 ... Stem 8 ... Male thread part DESCRIPTION OF SYMBOLS 9 ... Concave part 10 ... Female thread part 11 ... Handle 12 ... O-ring 13 ... Male thread part 14 ... Sheet 15 ... O-ring 16 ... Short pipe part 17 ...鍔 part 18 ... engagement part 19 ... female thread part 20 ... annular ridge part 21 ... valve body 22 ... convex part 23 ... short tube 24 with hook ... engagement part 25 ... Valve body 26 ... Projection 27 ... Short tube 28 with hook ... Engagement part 29 ... Cap nut

Claims (5)

  A ball valve element that opens and closes the flow path in the valve body is rotatably arranged, and the seat is provided so as to be pressed against the ball valve element by pressing the ball, and the cap nut is engaged with the flange of the flanged short tube. And at least one protrusion on at least one end of the valve body in the ball valve in which the flanged short tube is disposed in contact with the outer end of the ball retainer by screwing to the end of the valve body. Alternatively, it has a recess, and the ball retainer is screwed to the inner periphery of the end, and an engagement portion that engages with the projection or recess of the valve body is provided at the end of the flange of the flanged short tube. A ball valve characterized by that.   The ball valve according to claim 1, wherein a plurality of convex portions or concave portions of the valve body are provided at equal intervals over the entire circumference of the end portion of the valve body.   3. The ball valve according to claim 1, wherein the convex portion or the concave portion of the valve body is provided in a sawtooth shape over the entire circumference of the end portion of the valve body.   A ball valve element that opens and closes the flow path in the valve body is rotatably arranged, and the seat is provided so as to be pressed against the ball valve element by pressing the ball, and the cap nut is engaged with the flange of the flanged short tube. In the ball valve in which the flanged short tube is disposed in contact with the outer end of the ball retainer by screwing into the end of the valve body, at least the end surface of the valve body and the end surface of the flanged short tube A ball valve characterized in that fine irregularities are provided on one end face.   The ball valve according to any one of claims 1 to 4, wherein the ball valve body is rotated by manual drive, pneumatic drive, and electric drive.

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