JPH0594583U - Valve with rotary valve such as ball valve - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevents twisting and protrusion of the seal ring of the ball valve, ensures good sealability for a long time, reduces the rotating torque of the rotary valve body such as balls, and improves the durability of the seal ring. To make it easier to install the seal ring. A seal ring 4 that deforms and presses a ball 2 into a receiving recess 6 in which a seal ring 4 of a valve chamber 10 is mounted,
The sliding ring 5 having rigidity is coordinated. When the seal ring 4 and the sliding ring 5 are pressed by the fluid pressure, the sealing ring 4 is pressed against the ball 2 and the sliding ring 5 moves within a slidable range.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a valve including a rotary valve body such as a ball valve.

[0002]

[Prior Art]

 As a conventional ball valve, the one shown in FIG. 5 is widely known. In this ball valve, a ball c having a communication hole f is arranged in a valve chamber b of a valve body a, and a seal ring e is provided in a receiving recess g provided at an opening of the flow hole d of the valve body a on the valve chamber b side. Is attached. Then, the ball c is deformed to be pressed, and this deformation seals the ball c. However, the attached seal ring e receives a force in the direction of the small arrow as the ball c rotates (in the direction of the large arrow). As a result, the seal ring is twisted, and in some cases, the seal ring is disengaged from the receiving recess g.

Therefore, a ball valve that solves this problem is proposed, for example, in Japanese Patent Laid-Open Nos. 48-24329 and 59-197676. In these valves, a plastic deformation portion is provided near the receiving recess to press and fix the seal ring to increase the pressing force of the seal ring against the ball to improve the sealing property and at the same time, to prevent twisting of the seal ring. It was designed to prevent disengagement. As described above, providing the plastically deformed portion to press the seal ring has the advantage that the seal ring can be strongly pressed against the ball and the sealability can be improved, but the pressing of the seal ring There is a problem that the rotation torque of the ball becomes large and the seal ring is worn out after repeated use, making it difficult to sufficiently seal and causing fluid leakage. In addition, in these valves, a plastically deformed portion must be provided near the receiving recess, and when forming the plastically deformed portion, a plastically deformable piece that is difficult to machine in advance is formed and the seal ring is received. After that, it is necessary to bend and deform it exactly by a predetermined amount. As a result, there are problems that it takes time to install the seal ring and the production cost becomes high.

[0004]

[Problems to be solved by the device]

 The present invention has been proposed in view of the above circumstances, and an object thereof is to ensure good sealing property for a long period of time and prevent twisting and protrusion of the seal ring, and at the same time, rotate valve body such as a ball. It is an object of the present invention to provide a valve provided with a rotary valve body such as a ball valve, in which the rotation torque of the valve is reduced, the durability of the seal ring is improved, and the seal ring can be easily mounted.

[0005]

[Means for Solving the Problems]

 The present invention includes a valve body 1 having a plurality of flow holes 11, 12, and 13 communicating with each other through a valve chamber 10, a rotary valve body such as a ball 2 arranged in the valve chamber for opening and closing the valve, and a valve chamber. A valve provided with a rotary valve body such as a ball valve having a seal ring 4 arranged in the flow near the flow hole for sealing against a rotary valve body such as a ball is provided with the following configuration. This solves the above problem. In the valve of the present invention, a receiving recess 6 for mounting the seal ring 4 is provided around the flow hole of the valve chamber 10. A seal ring 4 and a sliding ring 5 are arranged between the receiving recess 6 and the rotary valve body such as the ball 2. The seal ring 4 has elasticity so that it can be deformed to press the ball 2, and the sliding ring 5 has rigidity so as not to be deformed by fluid pressure. By the pressure, the receiving recess 6 and the rotary valve body such as the ball 2 slide irremovably.

[0006]

[Action]

 In the present invention, the sliding ring 5 has such rigidity that it is not deformed by fluid pressure, and this fluid pressure causes the receiving recess 6 and the rotary valve body such as the ball 2 to slide irremovably. Therefore, when the seal ring 4 and the sliding ring 5 are pressed by the fluid pressure, the sliding ring 5 moves within a slidable range as shown in FIGS. 3 to 4. At the same time, the seal ring 4 is also pressed, but is pressed between the sliding ring 5, the wall surface of the receiving recess 6 and the ball 2, resulting in a larger force than usual between the seal ring 4 and the ball 2. Can be sealed. That is, as the applied fluid pressure increases, the seal ring 4 is pressed against the ball 2 with a stronger force, and a greater sealing property is obtained. Even if the seal ring 4 is twisted or disengaged due to the rotation of the ball 2, the sliding ring 5 restricts the state shown in FIG. Does not occur. Moreover, when the fluid pressure stays at an appropriate level, the seal ring 4 is not significantly deformed and the pressing force on the ball 2 is relatively small, as shown in FIGS. Can be set. Therefore, the rotation resistance of the ball 2 caused by the pressing of the seal ring 4 is reduced, and the durability of the seal ring 4 is improved. Furthermore, when assembling, the seal ring 4 and the sliding ring 5 are arranged, and only the ball 2 presses them down, which enables extremely efficient work.

[0007]

【Example】

 An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a partially cutaway front view of a ball valve according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of a main part of the ball valve.

The ball valve according to this embodiment includes a valve body 1, a ball 2, and a spindle 3. The valve body 1 is formed by joining a plurality of members through a seal member as appropriate like a normal valve, and a valve chamber 10 that rotatably accommodates the ball 2 is formed in the center thereof. .. The valve chamber 10 is communicated with a left flow hole 11, a right flow hole 12, and a lower flow hole 13, and a spindle insertion hole is formed above. The spindle 3 is rotatably inserted into the spindle insertion hole via a seal member 31, and the ball 2 is attached to the lower end of the spindle 3.

The ball 2 opens and closes a valve, and has a communication hole 21 that communicates from the side to the bottom of the ball. Then, the ball 3 is rotated by rotating the spindle 3, and either the left circulation hole 11 or the right circulation hole 12 is brought into conduction with the lower circulation hole 13 via the communication hole 21.

As shown in FIG. 2, receiving recesses 6 and 6 ′ for mounting the seal rings 4 and 4 ′ and the sliding rings 5 and 5 ′ are circumferentially provided near the flow hole of the valve chamber 10. .. In this embodiment, two are provided, one on the left circulation hole 11 side and one on the right circulation hole 12 side, but since the functions are the same, only the left circulation hole 11 side will be described. The seal rings 4, 4 ', the sliding rings 5, 5', and the receiving recesses 6, 6'of both of them have different sizes in the drawing, but they may have the same size. An enlarged view of the lower left portion of FIG. 2 is shown in FIG. 3, and details will be described with reference to FIG.

First, the receiving concave portion 6 is a space formed between the wall surface of the valve chamber 10 and the ball 2, and the seal ring 4 and the sliding ring 5 are arranged in the receiving concave portion 6. The receiving recess 6 is connected to the left circulation hole 11 via the first gap 61 and is connected to the lower circulation hole 13 via the second gap 62, so that the seal ring 4 cannot reliably seal. The fluid in the left circulation hole 11 flows into the lower circulation hole 13 through the first gap 61, the receiving recess 6, and the second gap 62, and the valve leaks.

Next, the seal ring 4 has elasticity to be deformed by pressure, and is specifically made of synthetic resin such as Teflon or synthetic rubber. In this embodiment, an O-ring is used, which is mounted in the receiving recess 6 and is deformed closely with the ball 2 to perform sealing, but the shape thereof can be received in the receiving recess 6 and the ball 2 can be received. The condition can be appropriately changed under the condition that it can be closely adhered to and sealed.

Next, the sliding ring 5 has a rigidity that does not deform due to fluid pressure. Specifically, a metal such as stainless steel or a resin having a high rigidity is used. As shown in FIG. 3, the sliding ring 5 is a ring having a substantially quadrangular cross section composed of inner and outer peripheral surfaces and left and right end surfaces, and the inner peripheral surface has a taper whose diameter gradually changes. The outer peripheral surface is a parallel surface whose diameter does not change, and the left end surface is wider than the right end surface. Therefore, in the following description, the inner peripheral surface is referred to as a taper surface 51, the outer peripheral surface is referred to as a parallel surface 52, the left end surface is referred to as a large end surface 53, and the right end surface is referred to as a small end surface 54. The sliding ring 5 is arranged in the receiving recess 6 adjacent to the seal ring 4. More specifically, the tapered surface 51 is arranged so as to face the ball 2 with a slight clearance from the ball 2, the parallel surface 52 is arranged so as to be in contact with the wall surface of the receiving recess 6, and the large end surface 53 is sealed. The small end surface 54 is in contact with the ring 4 and faces the second gap 62.

The sliding ring 5 slides to the left and right in the drawing because the width of the small end surface 54 is smaller than the second gap 62, but the width of the large end surface 53 is larger than the second gap 62. , It won't jump out of this gap. Further, in this embodiment, since the parallel surface 52 is in contact with the wall surface of the receiving concave portion 6, stable sliding is possible. Furthermore, in this embodiment, the tapered surface 51 is formed so as to correspond to the spherical surface of the ball 2. However, by forming the tapered surface into a curved surface, the spherical surface of the ball 2 can be further improved. You may make it correspond well. As described above, the shape of the sliding ring 5 can be appropriately changed as long as the sliding ring 5 can slide in the receiving concave portion 6 and does not come off from the receiving concave portion 6.

Next, based on FIG. 4, a usage state of the ball valve will be described. FIG. 4 is an enlarged view of a main part of the state where the ball 2 is rotated 180 degrees from the state of FIGS. 1 to 3. That is, in the state of FIGS. 1 to 3, the left circulation hole 11 communicates with the lower circulation hole 13, but in the state of FIG. 4, the left circulation hole 11 is closed. At this time, when a large fluid pressure is applied from the left circulation hole 11, this fluid pressure is applied to the first gap 61 as shown by the arrow in FIG. 4, and if the seal by the seal ring 4 is incomplete, the fluid Leakage occurs. However, in this embodiment, the seal ring 4 and the sliding ring 5 are pressed in the second gap 62 direction, that is, in the right direction of FIG. 4, by the fluid pressure applied from the left circulation hole 11. By this pressing, the sliding ring 5 slides in the direction of the second gap 62, that is, in the right direction of FIG. 4, but since the width of the large end surface 53 is larger than the second gap 62, the tapered surface 51 contacts the ball 2. Stop in the state. At the same time, the seal ring 4 is also pressed in the direction of the second gap 62, that is, in the right direction in FIG. 4, but is pressed between the stopped sliding ring 5, the wall of the receiving recess 6 and the ball 2. The seal between the ball 2 and the ball 2 can be made with a force larger than usual. That is, as the applied fluid pressure increases, the seal ring 4 is pressed against the ball 2 with a stronger force, and a larger sealing property is obtained.

Further, even if the seal ring 4 is twisted or disengaged with the rotation of the ball 2, it is restricted by the sliding ring 5 in the state shown in FIG. There is no twist or disengagement. Moreover, when the fluid pressure stays at a normal and appropriate value, as shown in FIGS. 1 to 3, the seal ring 4 is not greatly deformed, and the pressing force on the ball 2 is relatively small. Can be set small. Therefore, the rotation resistance of the ball 2 caused by the pressing of the seal ring 4 is reduced, and the durability of the seal ring 4 is improved. Furthermore, when assembling, the seal ring 4 and the sliding ring 5 are arranged, and only the ball 2 presses them down, which enables extremely efficient work. Note that another sliding ring may be arranged on the side of the first gap 61 so that both sides of the seal ring 4 are sandwiched by the sliding rings. Further, the ball 2 can be implemented by changing to another rotary valve body such as a spherical one and a cylindrical one.

[0017]

[Effect of the device]

 As described above, the present invention secures a good sealing property for a long time, prevents the seal ring from twisting and protruding, reduces the rotation torque of the rotary valve body such as a ball, and further improves the durability of the seal ring. It is possible to provide a valve provided with a rotary valve body such as a ball valve whose height is increased and in which a seal ring can be easily mounted.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a ball valve according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of the ball valve.

FIG. 3 is an enlarged sectional view of an essential part showing a seal structure of the ball valve.

FIG. 4 is an enlarged sectional view of an essential part showing a seal structure of the ball valve at high pressure.

FIG. 5 is a cross-sectional view of a conventional ball valve.

[Explanation of symbols]

1 ... Valve body, 2 ... Ball, 4 ... Seal ring, 5 ...
Sliding ring, 6 ... Receiving recess, 10 ... Valve chamber, 11, 12,
13 ... Circulation hole.

Claims (1)

[Scope of utility model registration request] 1. A plurality of flow holes (1) communicating with each other through a valve chamber (10).
A valve body (1) equipped with (1), (12), and (13), a rotary valve body such as a ball (2) that is placed in the valve chamber and opens and closes the valve, and a valve near the flow hole in the valve chamber. In a valve equipped with a rotary valve body such as a ball valve equipped with a seal ring (4) for sealing the rotary valve body such as a ball, a seal ring (4 ) Is provided around the receiving recess (6), and between the receiving recess (6) and the rotary valve body such as the ball (2),
The seal ring (4) and the slide ring (5) are coordinated, and the seal ring (4) has elasticity that allows it to deform and press against the ball (2). 5) has such rigidity that it is not deformed by fluid pressure, and the receiving recess is formed by this fluid pressure.
A valve provided with a rotary valve body such as a ball valve, which is irremovably slidable between (6) and a rotary valve body such as a ball (2).