JP3024590U - Ball valve - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a seal member 6 only on a part of a hemispherical valve body 22.
An inexpensive ball valve is provided by providing 6, 68 and making them easy to replace. SOLUTION: A case 12 is formed with horizontal communication holes 14 and 16 and a shaft hole 13 which open to a hemispherical hollow space 18, and a plug 20 is inserted from a lower end opening of the hollow space 18,
The valve shaft 36 of the plug 20 is inserted into the shaft hole 13 through the sealing material,
The hemispherical valve body 22 is fitted into the hollow space 18, and the hollow space 1
The cover 32 is detachably fitted and fixed to the lower end of the valve 8, the valve body 22 is supported by the cover 32, and the valve shaft 36 that is interlocked with the operating lever is rotated to connect the communication holes 14 and 16 to the valve body. A ball valve for connecting to and disconnecting from the connection hole 24 formed in the valve body 22, in which recesses 62, 64 provided on the outer surface of the valve body 22 are fitted and held with seal members 66, 68 having spherical arc surfaces. Communication holes 14, 1 when shut off by
6 was covered.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a ball valve that is provided in the middle of a pipeline through which liquid or the like flows to open or close the flow of liquid or the like.

[0002]

[Prior art]

 Conventionally, a valve provided in the middle of a pipe through which liquid or the like flows is of an elevating type in which the valve body moves up and down as the valve rod moves up and down to open and close the pipe, and a non-elevating type in which only the valve body moves up and down. was there. Also, there is a ball valve shown in German Patent No. 3914327. The ball valve has a cover above the case, the cover having a conduit with two parallel closures. The conduit is fitted with a plug that rotates on a bearing mounted on the case and is sealed by a cover. Then, each O-ring arranged in the concave portion where the above-mentioned conduit is extended is attached to the central member, and is arranged in an area close to the communication hole formed in the ball valve.

Further, the ball valve shown in German Patent No. 9408156 has a seal (packing) member made of a single component in a valve, and the seal member is a hollow member provided in the case. It is supported by the wall surface of the space and maintains a sealed state. This valve has a hemispherical recess, is fitted into the valve body of the plug, and the shaft hole is also communicated with the shaft communication hole. The seal member is made of an appropriate material and covers the entire hollow space of the case to prevent fluid (medium) such as liquid or gas flowing in the case from being retained in cracks or blind spots. It is designed to prevent it.

[0004]

[Problems to be solved by the device]

 The ball valve with the above-mentioned configuration can prevent foreign matter from entering the hollow space between the cover and the valve body, and can sufficiently maintain the opening / closing function of the valve, but the sealing member arranged in the case of the valve is used. In the case of loss, it is necessary to replace all of the covering parts that make up the seal member, and if the covering parts are made of a high-grade material, there is a problem that it costs a lot of money.

The present invention solves the above-mentioned problems and provides a seal member only on a part of a hemispherical valve body of a plug, and the seal member can be easily replaced and can be repaired inexpensively. Is intended to provide.

[0006]

[Means for Solving the Problems]

 A ball valve according to the invention of claim 1 has a case in which a plurality of communication holes having inner ends open and a shaft hole orthogonal to the communication holes are formed in a hemispherical hollow space, and the hemispherical space in the hollow space. The valve shaft fitted with the valve body and protruding from the hemispherical valve body is fitted into the shaft hole through the seal material provided on the axial front end side and the rear end side of the shaft hole wall, and the hemisphere is also inserted. A plug in which a connection hole that can be connected to the communication hole is formed in the valve body, the inner cylinder of the operating lever held by a nut that is screw-fitted to the tip of the shaft of the plug, and the sealing material on the tip side. A disk spring interposed between the cover and a cover for removably fixing the plug to the case by closing the opening on the side opposite to the shaft hole in the hollow space of the case and supporting the plug is provided. Button that connects and disconnects the communication hole and the connection hole A plug valve, a recess that can face the communication hole is provided on the outer surface of the hemispherical valve body of the plug, and a seal member that covers the communication hole at the cutoff position between the communication hole and the connection hole is fitted and held in the recess. In addition, the surface of the seal member is a spherical arc surface that is continuous with the outer surface of the hemispherical valve body of the plug.

According to a second aspect of the invention, in the ball valve according to the first aspect, at least one of a front surface and a bottom surface of the seal member is circular or polygonal.

According to a third aspect of the invention, in the ball valve according to the first aspect, the bottom surface of the seal member is dome-shaped.

A fourth aspect of the invention is the ball valve according to any one of the first to third aspects, wherein the bottom surface of the seal member is supported by the bottom surface of the recess via a spring.

According to a fifth aspect of the invention, in the ball valve according to any one of the first to fourth aspects, a ring groove is formed in the bottom surface of the seal member, and an O-ring that abuts the bottom surface of the recess is fitted in the ring groove. It is a combination.

According to a sixth aspect of the present invention, in the ball valve according to the first aspect, the plug has a columnar body formed at an end portion of the hollow space on the cover side, and the columnar body is supported on an inner surface of the cover. It is a thing.

According to a seventh aspect of the invention, in the ball valve according to the ninth aspect, the plug is provided with a bush provided on an outer periphery of a cylindrical body that abuts a peripheral wall of a cylindrical portion of a hollow space of the case.

The invention of claim 8 is the ball valve according to any one of claims 1, 6 and 7, wherein the cover is provided with an O-ring on the inner surface that abuts against the step of the case.

[0014]

[Embodiment of device]

 An embodiment of the present invention will be described below with reference to the drawings. As shown in each of FIGS. 1 to 3, the ball valve 10 according to the first embodiment of the present invention includes a case 12, a plug 20, and a cover 32. In the case 12, horizontal communication holes 14 and 16 are coaxially formed in a straight line. The communication holes 14 and 16 have an outer end open to the outside of the case 12, and an inner end of the case 12 having a hemispherical hollow shape. It opens into the space 18. In the hollow space 18, a hemispherical portion 18b is formed on a cylindrical portion 18a formed at the bottom, a vertical shaft hole 13 orthogonal to the communication holes 14 and 16 is formed on the hemispherical portion 18b, and a bottom surface forms a step 18c. It has a large inner diameter and opens.

In the plug 20, the hemispherical valve body 22 is fitted into the hollow space 18 of the case 12, and a cylindrical body 26 integral with the hemisphere is formed in the lower portion of the hemispherical valve body 22, and the cylindrical body 26 is hollow. The columnar portion 18a of the space 18 is fitted, and the vertical valve shaft 36 protruding above the hemispherical valve body 22 is fitted into the shaft hole 13 of the case 12. A connection hole 24 for connecting and disconnecting is formed horizontally. Then, a bush 28 made of a suitable sealing material is fitted and fixed to the lower outer circumference of the cylindrical body 26 having a small outer diameter by press fitting or the like, and the outer peripheral surface of the bush 28 is pressed against the inner surface of the cylindrical portion 18a. It

The cover 32 is screw-fitted into the large-diameter bottom of the hollow space 18 of the case 12 to be detachably fixed to the case 12, and the inner surface is supported by the step 18c. The cover 32 may be fastened to the stepped portion 18c at a plurality of circumferential positions with bolts. Then, the O-ring 34 is fitted into the annular groove 32a formed on the inner surface of the cover 32, and the O-ring 34 is pressed against the lower surface of the step 18c to seal between the case 12 and the cover 32.

A large inner diameter portion is formed at each of the lower end portion and the upper end portion of the shaft hole 13 of the case 12, and annular lower and upper seal members 38 and 40 are fitted into these, respectively, to form a lower seal. The upper outer peripheral surface of the hemispherical valve body 22 of the plug 20 and the lower peripheral end of the outer peripheral surface of the valve shaft 36 are brought into contact with the inner peripheral surface of the material 38, and the outer peripheral surface of the valve shaft 36 is contacted with the inner peripheral surface of the upper seal material 40. I have contacted you. The upper sealing member 40 has an upper end portion slightly projected from the upper end of the case 12.

The upper portion of the valve shaft 36 is projected above the upper sealing member 40, and the compression ring 42 is fitted on the outer periphery of the projected portion so that the compression ring 42 is supported on the upper sealing member 40. A disc spring 44 fitted on the valve shaft 36 is fitted, and the spring 44 is supported by an inner cylindrical portion 46 protruding below the base of the actuating lever 50.

The actuating lever 50 fits the inner cylinder portion 46 into a small-diameter threaded portion 36 a formed on the upper end of the valve shaft 36, and a nut 52 is screw-fitted to the threaded portion 36 a so that the inner cylinder portion 46 is closed. Tighten and fix to the step 36b of the shaft 36. An outer cylinder 48 is projected downward from the base of the actuating lever 50, and a pair of projections 54 and 56 projecting downward from the outer cylinder 48 are formed in a pair of arc-shaped grooves 58 formed on the upper surface of the case 12. Each of them is loosely inserted in 60 to limit the rotation of the operating lever 50 and the plug 20 to a predetermined angle.

On the surface of the hemispherical valve body 22, the plug 20 has recesses 62 and 64 facing the inner end openings of the communication holes 14 and 16 of the case 12 and having a flat bottom surface (flat bottom) at both ends of the connection hole 24. Sealing members 66 and 68 are fitted and held in the recesses 62 and 64 at the center of the space.

As shown in FIG. 1, the sealing members 66 and 68 have a surface adapted to the surface of the hemispherical valve body 22 of the plug 20, a spherical arc-shaped surface continuous to this surface, and a dome-shaped convex lens on the bottom surface. Of the sealing material 66 and 68, the peripheral edges of the surfaces of the sealing materials 66 and 68 are in contact with the wall surface of the hollow space 18 of the case 12, and both end openings of the connection hole 24 and inner ends of the communication holes 14 and 16 are formed. The opening and the wall are sealed to ensure that they are blocked. In the shut-off state, the seal members 66, 68 are elastically deformed and pushed to the bottom side in the recesses 62, 64, and the elastic restoring force of the seal members 66, 68 causes the peripheral edge portions of these to become hollow spaces 18. It is pressed against the outer peripheral side of the inner end openings of the communication holes 14 and 16 on the wall surface. Further, the nut 52 is used to pre-pressurize the valve shaft 36 and the plug 20, and is designed to achieve effective sealing without any blind spot together with the hemispherical valve body 22 in the case 12.

In the ball valve of the first embodiment, when the communication holes 14 and 16 shown in FIG. 1 are disconnected from the connection hole 24, the communication holes 14 and 16 are closed by the seal members 66 and 68 to prevent the fluid such as the liquid from flowing. Distribution is blocked. By rotating the valve shaft 38 by 90 ° while holding the operating lever 50 from this state, the communication hole 14 and the communication hole 16 are connected in a straight line by the connection hole 24 as shown in FIG. The fluid is circulated through the channels 24, 16.

FIG. 4 shows a modified example of the ball valve according to the first embodiment described above. In the plug 20 shown in FIG. 4, the bottom surfaces of the seal members 66, 68 are flat (flat bottom), and the bottom surface has an annular groove. 68a (one of which is not shown) is formed, and elastic O-rings 70 (one of which is not shown) are fitted to these, and these are brought into contact with the flat bottom surfaces of the concave grooves 62 and 64, so that they face outward. The seal members 66 and 68 are pre-pressurized. The plug 20 shown in FIG. 4 can be used in the same manner as in the first embodiment by using the same case 12, cover 32, etc. as those of the ball valve according to the first embodiment.

FIG. 5 shows a ball valve 10 according to a second embodiment of the present invention, in which a hemispherical valve body 22 of a plug 12 is formed with an L-shaped connection hole 25, and a case 12 is formed with a straight communication hole 14. A central communication hole 15 orthogonal to these is formed in the middle of 16, and recesses 63 and 69 are formed on the outer surfaces of the extension portions of both side portions 25a and 25b of the connection hole 25 formed in the hemispherical valve body 22 which intersect at right angles. The seal members 65 and 67 are fitted and held on these members, respectively.

In the ball valve of the second embodiment, in the state shown in FIG. 5, by connecting the communication hole 14 and the communication hole 15 with the L-shaped connection hole 25, these holes 14, 25, 15 are formed. The fluid is flowed in through the above, and the communication hole 16 is blocked by the one seal member 67. By rotating the plug 12 clockwise by 90 ° from this state, the communication hole 16 and the communication hole 15 are connected by the L-shaped connection hole 25, and the fluid is passed through these holes 16, 25, 15. They are circulated and the communication hole 14 is blocked by the other sealing member 65. Therefore, in the ball valve of the second embodiment, by rotating the plug 12 about the axis in the clockwise direction and the counterclockwise direction by 90 °, the communication holes 14 and 16 are switched to one of these and the connection hole 15. The fluid can be circulated by.

FIG. 6 shows a ball valve 10 according to a third embodiment of the present invention, in which a T-shaped connection hole 71 is formed in the hemispherical valve body 22 of the plug 12, and a straight communication hole 14 is formed in the case 12. A central communication hole 15 is formed in the center of 16 so as to intersect them at right angles, and a recess 72 is formed on the outer surface of the extension of a portion 71b orthogonal to the center of the straight portion 71a of the T-shaped connection hole 71 of the hemispherical valve body 22. The seal member 73 is formed and fitted and held in the recess 72.

In the ball valve of the third embodiment, in the communication state shown in FIG. 6, the fluid is sent from the communication hole 15 to the communication holes 14 and 16 by dividing the communication hole 15 by the T-shaped connection hole 71, or the communication hole 14 and 16. The fluid can be sent from 16 to the communication hole 15 by merging at the connection hole 71, and the plug 12 is rotated by 90 ° so that the central communication hole 15 is blocked by the seal member 73. Therefore, in the pole valve of the third embodiment, the fluid is diverted from the central communication hole 15 to the two communication holes 14 and 16, or the fluid is merged from these communication holes 14 and 16 to the central communication hole 15. The fluid can be circulated, and the fluid can be blocked by covering the central communication hole 15 with one sealing member.

In the ball valves according to the second and third embodiments, the bottom surface of the recess provided in the hemispherical valve body of the plug has a spherical arc shape, and the rotation angle of the plug is controlled to 90 °. Other than the above, the configuration and operation are the same as those of the ball valve according to the first embodiment except for the configuration and operation described above, and therefore description and illustration are omitted. Further, in FIGS. 4, 5, and 6, the same reference numerals as those in FIGS. 1 to 3 indicate the same or corresponding portions.

In this invention, the seal member fitted in the recess of the hemispherical valve body is selected as necessary. In other words, depending on the fluid (medium) such as liquid or gas and the corrosion prevention by its temperature, non-viscosity of fluororesin such as polytetrafluoroethylene (PTFE), Teflon (trade name), or the like Material, such as graphite suitable for high temperature, ceramics, metal, etc., which has malleability and elasticity, is used. If it is damaged due to use such as friction or cracks, remove the nut 52, actuating lever 50, cover 32, etc. Then, the plug 22 can be pulled out below the case 12, the seal member can be removed from the recess, and a new seal member can be replaced.

In the present invention, the most advantageous shape of the surface of the seal member is circular, but it may be polygonal, and the circular seal member is press-fitted (press fitted) into the recess provided in the hemispherical valve body. Preferably, when fitted, the surface of the sealing member can radially project the outer shape of the valve body and, after closing, achieves a seal with an effective pressure.

As another form of the present invention, the bottom surface of the seal member has a crown shape so that the seal member is press-fitted into the concave portion in the radially outward direction, and the seal portion forms a spring, Press into the through holes in the case to create an effective seal. Instead, a spring may be interposed between the seal member and the bottom of the recess to obtain downward pressure (claim 4), or a ring groove may be formed on the bottom surface of the seal member, and the O-ring may be formed in this groove. The spring may be formed by fitting and supporting it on the bottom of the recess (claim 5).

In this invention, the valve shaft is surrounded by the shaft hole wall of the case, and the valve shaft is brought into contact with the annular seal members 38, 40 provided in the hole wall, and the valve shaft is supported on the case by the nut. So that the seal material 40 is preloaded. This is because the sealing material for the hemispherical valve body and the valve shaft is pre-pressurized simultaneously from the outside. The disc spring fits on the valve shaft and is placed between the nut and the case to allow the ball valve to operate smoothly and adjust automatically.

Further, according to this invention, there is a cylindrical body on the cover side of the hemispherical valve body of the plug, and by inserting the cylindrical portion of the hollow space of the case as a socket, an annular bush is formed in the cylindrical portion. Since the case is fitted, the case and the plug achieve a seal at the cover-side end (claims 6 and 7). Further, since the O-ring provided on the cover is pressed against the step of the case, the seal between the cover and the case can be achieved.

In the ball valve according to the present invention, as shown in FIGS. 5 and 6, the case has three communication holes and the plug connection holes are L-shaped and T-shaped. Even if a three-way valve is constructed by rotating the plug 90 °, the same effects as those described below with the ball valve shown in FIGS. 1 to 4 can be obtained, and a four-way valve and a five-way valve can be constructed. .

[0035]

[Effect of device]

 As described above, the invention according to claim 1 forms a hollow space having a hemispherical wall surface in a case, and forming a plurality of communication holes and an axial hole orthogonal to these holes in the hollow space, The hemispherical valve body of the above is fitted into the hollow space, the valve shaft protruding from the valve body is inserted into the shaft hole, and the cover is fixed to the end of the hollow space opposite to the shaft hole. A ball valve for connecting and disconnecting the communication hole and a connection hole formed in the valve body by rotating a valve shaft, wherein a seal member is held in a concave portion provided on the surface of the valve body to seal the valve. Since the communication hole is covered by the member when shutting off, the following effects can be obtained. That is, since the sealing member is fitted and retained only in the recess provided in a part of the hemispherical valve body of the plug, even if the sealing member is damaged by use, it can be easily replaced and repaired at low cost. .

Further, in the invention according to claim 1, since the conduit can be directly welded to the case, the volume of the ball valve can be made small, the weight can be made light, the material can be saved, and the ball valve as a whole can be made inexpensive. . Further, a connecting pipe to a conduit having a flange in the case and a flange of the conduit are unnecessary, a sealing material between the connecting pipe and the conduit is not necessary, and the time required for assembling these is short, Since it is a welded joint, it is possible to prevent fluid such as liquid from leaking to the outside.

According to the first aspect of the invention, since the hollow space of the case is hemispherical and the wall surface thereof has the same shape as the outer surface of the hemispherical valve body of the plug, a fluid such as a liquid is almost entirely contained in the hollow space. The fluid can be effectively transported without stagnation, and the impact and obstruction on the ball valve due to the stagnation of the transported fluid can be reduced.

The ball valve according to the first aspect of the invention is suitable for the chemical industry, the pharmaceutical industry, the food industry such as milk production, and the like, and is safe after the fluid such as liquid leaks outward. Suitable for fluids that are worried about.

According to the first aspect of the invention, in order to connect and disconnect the communication hole and the connection hole, the torque when rotating the plug in a stroke such as 90 ° is almost the same, and the surface of the sealing member is spherical. Since a spherical arc-shaped surface that is continuous with the outer surface of the arc-shaped valve body, there is little stagnation of fluid such as liquid.

For the seal member, it is preferable to use a material such as a fluororesin having elasticity and low adhesiveness, and having a smooth surface. In addition, in the case of the above embodiment, the replacement of the seal member is performed by removing the nut at the tip of the valve shaft, removing the cover from the case, and pulling out the plug from the lower end of the hollow space of the case to make the seal member a hemispherical shape. After removing from the recess provided in the valve body and fitting and holding a new seal member in the recess, the plug may be inserted into the case, and the cover, the nut and the like may be attached.

Further, the inventions of claims 2 to 8 have the advantages as described in the detailed description of the invention.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a shutoff (closed) state of a ball valve according to a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of the ball valve shown in FIG. 1 in a connected (open) state.

FIG. 3 is a cross-sectional plan view of FIG.

FIG. 4 is a partially cutaway front view of a plug according to a modification of the ball valve according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a ball valve according to a second embodiment of the present invention.

FIG. 6 is a cross sectional view showing a ball valve according to a third embodiment of the present invention.

[Explanation of symbols]

 10 ball valve 12 case 13 shaft hole 14 communication hole 15 central communication hole 16 communication hole 18 hollow space 20 plug 22 hemispherical valve body 24 connection hole 25 L-shaped connection hole 26 cylindrical body 28 bush 32 cover 34 O-ring 36 Valve shaft 38 Sealing material 40 Sealing material 42 Compression ring 44 Disc spring 46 Inner cylinder part 48 Outer cylinder part 50 Actuating lever 52 Nut 54 Projection part 56 Projection part 58 Arc groove 60 Arc groove 62 Concise 63 Recess 64 Concave 65 Seal member 66 Sealing member 67 Sealing member 68 Sealing member 69 Sealing member 70 O-ring 71 T-shaped connection hole 72 Sealing member 73 Sealing member

Claims (8)

[Scope of utility model registration request] 1. A case in which a plurality of communication holes whose inner ends are open and shaft holes orthogonal to the communication holes are formed in a hemispherical hollow space, and a hemispherical valve element is fitted in the hollow space. The valve shaft protruding into the hemispherical valve body is fitted into the shaft hole through a sealing material provided on the axially front end side and the rear end side of the shaft hole wall, and the hemispherical valve body is connected to the communication hole. A disc spring that is interposed between the plug that has a connectable connection hole and the inner cylinder of the operating lever that is held by a nut that is screwed into the tip of the shaft of the plug, and the sealing material on the tip side. And a cover for removably fixing to the case and supporting the plug by closing an opening of the case on the side opposite to the shaft hole of the hollow space, and connecting the communication hole and the connection hole by rotating the valve shaft. A ball valve that is designed to connect and disconnect A concave portion that can face the communication hole is provided on the outer surface of the spherical valve body, and a seal member that covers the communication hole at a cutoff position between the communication hole and the connection hole is fitted and held in the concave portion, and the surface of the seal member is plugged. A ball valve characterized by having a spherical arc-shaped surface continuous with the outer surface of the hemispherical valve body. 2. The seal member has at least one of a front surface and a bottom surface formed into a circular shape or a polygonal shape.
Ball valve described in. 3. The ball valve according to claim 1, wherein the bottom surface of the seal member has a dome shape. 4. The bottom surface of the seal member is supported by the bottom surface of the recess via a spring.
The ball valve according to any one of 3 above. 5. A ring groove is formed on the bottom surface of the seal member,
The ball valve according to any one of claims 1 to 4, wherein an O-ring that abuts the bottom surface of the recess is fitted in the ring groove. 6. The ball valve according to claim 1, wherein the plug has a columnar body formed at the end of the hollow space on the cover side, and the columnar body is supported on the inner surface of the cover. 7. The ball valve according to claim 6, wherein the plug is provided with a bush on the outer periphery of the cylindrical body, the bush being in contact with the peripheral wall of the cylindrical portion of the hollow space of the case. 8. The ball valve according to claim 1, wherein the cover is provided with an O-ring on its inner surface that abuts against a step of the case.