JP5599638B2 - Butterfly ring seat ring and butterfly valve - Google Patents

Description

  The present invention relates to a butterfly valve seat ring mounted on a peripheral edge of a valve plate of a butterfly valve, and a butterfly valve including the same.

  In general, a pipeline through which gas or liquid flows can be appropriately opened and closed by interposing a valve such as a butterfly valve. In particular, in a pipeline through which toxic or explosive gas or liquid flows, it is necessary to prevent leakage more reliably, and therefore a water-sealed butterfly valve may be employed (for example, Patent Document 1).

  FIG. 14 shows a water-sealed butterfly valve of Patent Document 1. This water-sealed butterfly valve has a structure in which two valve plates 103 that are rotated by an operating shaft 102 are attached to a main body 101, and water is sealed between the two valve plates 103, so that the water-sealed butterfly valve is completely sealed. It is designed to be sealed.

  Further, as shown in FIG. 15, an inflatable seat ring 104 is provided that can be expanded and contracted by introducing and removing fluid, and the inflatable seat ring 104 is expanded and pressed against the valve plate 103 to open and close the valve plate 103. The gap between the main body 101 and the valve plate 103 is sealed without hindering the above.

JP 2001-336643 A (paragraph numbers 0005 to 0008, FIGS. 2 and 4)

  However, as in Patent Document 1, the inflated seat ring that is expanded by introducing a fluid tends to be deformed, so that the contact pressure between the valve plate and the valve plate tends to be insufficient. And the like may stay, the sealing function may be impaired.

  An object of the present invention is to provide a butterfly valve seat ring and a butterfly valve that can obtain a sufficient sealing function without hindering the opening / closing operation of the valve body.

To achieve the above object, the seat ring for the butterfly valve according to the present invention is mounted on the periphery of the valve plate of the butterfly valve, which is brought into contact with the valve casing side seat in the closed state, the valve casing side sheet A seat ring body made of a rubber-like elastic body that can be closely attached to the seat ring body, and an auxiliary ring provided integrally with the seat ring body, and the auxiliary ring is made of a material having a hardness higher than that of the seat ring body , At least the outer peripheral edge of the auxiliary ring is provided so as to be exposed from the seat ring body so as to be in contact with the valve box side seat .

  According to the above configuration, the seat ring body can be reinforced by the auxiliary ring formed of a material having high hardness, so that the seat ring is extended while extending the life of the seat ring, and the seat ring is set to have sufficient rigidity as a whole. The main body can be made of a soft material. Thereby, without excessively increasing the contact pressure with the valve box side seat, the seat ring body can be sufficiently adhered and sealed to the valve box side sheet, and dust attached to the valve box side sheet can be removed. Since it can be scraped off by the auxiliary ring, it is possible to enhance the sealing function while preventing the opening / closing operation from being inhibited by suppressing the contact pressure.

  Furthermore, it is possible to adopt a configuration in which a plurality of auxiliary rings are provided at intervals in a direction parallel to the central axis passing through the central hole of the seat ring body.

  According to this configuration, when the valve is closed, among the plurality of auxiliary rings, the front auxiliary ring comes into contact with the valve box side seat first in the traveling direction of the valve plate peripheral portion, and in the direction toward the rear auxiliary ring. Receive friction. Thereby, the interval between the plurality of auxiliary rings is narrowed, and the portion located between both auxiliary rings in the seat ring main body is pushed out toward the valve box side seat. The contact pressure can be increased to further enhance the sealing function.

  In addition, by attaching the above-described butterfly valve seat ring to the peripheral portion of the valve plate, a butterfly valve that exhibits the effect of adopting the above-described configuration of the butterfly valve seat ring can be obtained.

  That is, the present invention includes a valve box interposed in a pipe line and a valve body accommodated in a central hole of the valve box. The valve body includes a valve plate and the valve plate. A butterfly valve comprising a valve rod rotatably supported with a direction orthogonal to the flow path direction of the pipeline as a rotation axis, wherein the pipeline can be opened and closed by rotating the valve rod, A valve box side seat that protrudes in a ring shape to receive the peripheral edge of the valve plate is provided on the inner peripheral surface of the valve box, and the butterfly valve seat ring is mounted on the peripheral edge of the valve plate. A characteristic butterfly valve is provided.

  Furthermore, when toxic or explosive gas or liquid flows through the pipeline, it is preferable to more reliably prevent liquid leakage by adopting a liquid ring butterfly valve as the butterfly valve. It is.

  That is, according to the present invention, in the butterfly valve, the valve body includes two valve plates that are integrally provided with an interval in a plate thickness direction, and the valve box side seat is formed of two valve plates. The butterfly valve seat ring is mounted on the peripheral edge of the two valve plates, and is surrounded by the inner peripheral surface of the valve box and the two valve plates. There is provided a butterfly valve characterized in that a pouring / draining part for pouring / draining in a space is provided to be a liquid seal type.

  As is apparent from the above description, according to the present invention, the seat ring body is made of a soft material while enhancing the rigidity of the seat ring as a whole by reinforcing the seat ring body with the auxiliary ring. As a result, while suppressing the contact pressure with the valve box side seat, the seat ring body can be brought into close contact with the valve box side sheet, and dust attached to the valve box side sheet can be scraped off by the auxiliary ring. A sufficient sealing function can be obtained while preventing the opening / closing operation of the valve body from being hindered by contact between the seat ring and the valve box side seat.

The figure which shows the liquid-sealed butterfly valve which concerns on this invention, a right half is a front view, and a left half is sectional drawing. AA sectional view of FIG. Cross-sectional view of the main part of FIG. Perspective view of valve box Perspective view of valve body, seat ring and seat pressing part An enlarged sectional view of the seat ring and the vicinity thereof (first embodiment) Sectional view of a mold for molding a seat ring (first embodiment) The figure explaining operation | movement of a seat ring (1st Embodiment). The figure which shows the force which acts on the seat ring of a valve closing state (1st Embodiment) Sectional view of the seat ring and its vicinity (second embodiment) Sectional drawing of the metal mold | die which shape | molds a seat ring (2nd Embodiment) The figure explaining operation | movement of a seat ring (2nd Embodiment). The figure which shows the force which acts on the seat ring of a valve closing state (2nd Embodiment) A diagram showing a conventional liquid-sealed butterfly valve The figure which shows the seat ring of the conventional liquid seal butterfly valve

  Hereinafter, embodiments of a seat ring for a butterfly valve and a butterfly valve according to the present invention will be described with reference to the drawings.

[First Embodiment]
As shown in FIGS. 1 to 3, the liquid-sealed butterfly valve 1 is interposed, for example, in a conduit for flowing toxic or explosive gas or liquid, and is a valve box interposed in the conduit. 2 and a valve body 4 accommodated in the central hole 3 of the valve box 2, and the valve body 4 includes two valve plates 5 that are integrally provided with an interval in the plate thickness direction. The valve plate 5 is composed of valve rods 6 and 7 that rotatably support the direction orthogonal to the flow path direction of the pipe as a rotation axis, and the pipe is opened and closed by rotating one of the valve rods 6. It has become.

  As shown in FIGS. 1, 2, and 4, the valve box 2 is formed in, for example, a metal cylinder having the same inner diameter as the pipe, and the inner peripheral surface of the two valve plates 5 is closed when the valve is closed. Two strips of valve box side seats 8 that protrude in a ring shape so as to receive the peripheral edge portions are formed. Valve stem support portions 9, 10 are formed on both sides in the radial direction of the valve box 2, and a liquid discharge portion 11 is disposed on both sides in the radial direction in a direction perpendicular to the direction passing through the valve rod support portions 9, 10. Is formed.

  As shown in FIGS. 1 to 3, one valve stem support portion 9 of the valve box 2 is rotatably supported while penetrating the valve stem 6 so that the valve body 6 can be rotated from the outside of the valve box 2. I have to. Further, the other valve stem support portion 10 supports the valve stem 7 without allowing it to penetrate therethrough.

  As shown in FIG. 1 to FIG. 3 and FIG. 5, the valve plate 5 has a disc shape, and the two valve plates 5 are integrally formed via a plurality of parallel partition walls 12, and the radial direction thereof. Boss portions 13 and 14 for inserting the end portions of the valve rods 6 and 7 are formed on both sides. The bosses 13 and 14 are bolted to the end surfaces of the set pins 15 that pass through the end portions of the valve rods 6 and 7 so that the valve plate 5 and the valve rods 6 and 7 are integrated.

  As shown in FIGS. 1 to 3, 5, and 6, a circumferential groove 16 is formed on the outer surface side of the peripheral portion of the valve plate 5, and the peripheral portion of the valve plate 5 and the valve are formed in the peripheral groove 16. A seat ring 17 for sealing between the box side seat 8 is mounted.

  As shown in FIG. 6, the seat ring 17 includes a seat ring main body 18 made of a rubber-like elastic body such as nitrile rubber having a hardness of about A60 to A80, for example, and an auxiliary ring 19 that reinforces the seat ring main body 18. As a whole, a ring shape having a substantially rectangular cross section and a substantially circular outer periphery is formed. The seat ring 17 is sandwiched and held between the peripheral edge of the valve plate 5 and the sheet pressing portion 20 while projecting the outer peripheral edge radially outward from the peripheral edge of the valve plate 5, and the outer peripheral edge is deformed. Then, it comes into close contact with the valve box side seat 8.

  The auxiliary ring 19 is made of a material that is harder than the seat ring body 18 and is deformable, such as a metal wire net, carbon fiber net, or hard rubber having a hardness of about A80 to A90, and is formed in a ribbon shape and a ring shape. . The auxiliary ring 19 is embedded in the substantially circular section of the outer peripheral edge of the seat ring main body 18 while exposing the outer peripheral edge of the auxiliary ring 19, and is parallel to the central axis passing through the central hole of the seat ring main body 18. Two auxiliary rings 19 are provided integrally with the seat ring body 18 with a gap therebetween. If the material of the auxiliary ring 19 is higher than that of the seat ring body 18, the hardness can be selected as appropriate. In the case where the gel substance adheres to the valve box side sheet 8. It is better to use a relatively hard material.

  The seat pressing portion 20 has an outer diameter similar to that of the valve plate 5 and is shaped like a ring that fits in the circumferential groove 16 together with the seat ring 17, and the valve plate 5 is pressed by the pressing bolt 21 while the seat ring 17 is interposed. Is bolted to the periphery of The seat pressing portion 20 presses a part of the seat ring 17 to the outer peripheral side and bulges out by sandwiching the seat ring 17 with the peripheral edge of the valve plate 5. Thereby, the amount of tightening of the pressing bolt 21 is adjusted, the amount of swelling from the peripheral edge of the valve plate 5 is adjusted, and the contact pressure between the seat ring 17 and the valve box side seat 8 is set to a desired magnitude. be able to.

  The pouring / draining part 11 opens between the two valve box side seats 8 inside the valve box 2, and when the valve is closed, the inner peripheral surface of the valve box 2 and the two valves from one pouring / draining part 11 The liquid is poured into the space surrounded by the plate 5 and drained from the other pouring / draining part 11 when the valve is opened.

  Next, a method for forming the seat ring 17 will be described. First, the unvulcanized rubber of the seat ring main body 18 is molded, and two auxiliary rings 19 are embedded in the outer edge portion at intervals. The auxiliary ring 19 is formed wider than the final shape, and a width equivalent to that of the embedded portion is projected from the seat ring body 18.

  As shown in FIG. 7, the unvulcanized rubber of the seat ring body 18 and the molded body 22 of the auxiliary ring 19 are inserted into the upper mold 23 and the lower mold 24, and the ring set mold 25 is set between both molds 23 and 24. Thus, the protruding portion of the auxiliary ring 19 is sandwiched, and further, a pin 26 for forming a bolt hole for inserting the pressing bolt 21 into the seat ring 17 is set.

  After the molded body 22 set in both molds 23 and 24 is heated and heated, the molded body 22 is vulcanized and molded while degassing and discharging excess rubber from the gas vent hole 27 and the gas vent / blowing groove 28. The seat ring 17 is obtained by cutting off the protruding portion of the auxiliary ring 19.

  Next, the opening / closing operation of the liquid seal butterfly valve 1 will be described. When the liquid-sealed butterfly valve 1 is closed, first, the valve rod 6 is rotated to bring the valve body 4 into a closed state.

  By opening and closing the valve body 4, the auxiliary ring 19 of the seat ring 17 scrapes off and removes dust accumulated between the seat ring 17 and the valve box side seat 8. As a result, leakage due to dust staying between the seat ring 17 and the valve box side seat 8 is prevented, and when the valve is closed, the pipe line is reliably shut off.

  When the valve body 4 is closed, as shown in FIGS. 8 (a) and 8 (b), two auxiliary rings can be used regardless of which side the seat ring 17 rides on the valve box side seat 8. 19, the front auxiliary ring 19 in the traveling direction of the seat ring 17 contacts the valve box side seat 8 first, and receives a stronger frictional force than the rear auxiliary ring 19. As a result, as shown in FIG. 9, the distance between the two auxiliary rings 19 is narrowed, and the rubber between them is pushed toward the valve box side seat 8, so that the seat ring 17 and the valve box side seat in the closed state are closed. The contact pressure with 8 is increased to improve the sealing performance.

  Since the seat ring body 18 is made of a soft material by the amount of reinforcement by the auxiliary ring 19 to increase the rigidity of the seat ring 17 as a whole, the seat ring 17 and the valve box side seat 8 are sufficiently adhered to each other. It is not necessary to excessively increase the contact pressure for sealing. This extends the life of the seat ring 17 and prevents the opening / closing operation of the valve body 4 from being excessively hindered by the friction between the seat ring 17 and the valve box side seat 8 when the valve body 4 is opened / closed. can do.

  After the valve body 4 is closed, liquid is poured between the two valve plates 5 from the liquid pouring part 11 and the pipeline is completely blocked by the sealing liquid.

  When the liquid-sealed butterfly valve 1 is opened, the liquid sealed between the two valve plates 5 is drained from the pouring / draining part 11, and then the valve rod 6 is rotated to open the valve. To do.

[Second Embodiment]
The seat ring 29 according to the second embodiment has substantially the same configuration as the seat ring 17 in the first embodiment, but instead of embedding the auxiliary ring 19 in the seat ring body 18, a cross-section of the outer peripheral edge of the seat ring body 30 Of the substantially circular portion, the auxiliary ring 31 is bonded to the front and back portions excluding the inner peripheral surface.

  This seat ring 29 is because the auxiliary ring 31 is provided on the front and back portions of the seat ring body 30 and exposed, so that the dust fixed to the valve box side seat 8 is scraped off by the opening and closing operation of the valve body 4. More preferred.

  As a method for forming the seat ring 29, first, as shown in FIG. 11 (a), the unvulcanized rubber of the seat ring body 30 is inserted into the upper mold 23 and the lower mold 24 as in the first embodiment. Mold into a shape. After that, as shown in FIG. 11B, the auxiliary ring 31 is disposed at a predetermined position of the seat ring main body 30 and is set again on the upper mold 23 and the lower mold 24, and the auxiliary ring 31 is attached to the seat ring main body 30. The sheet ring 29 is obtained by vulcanization adhesion.

  The opening / closing operation of the liquid ring butterfly valve provided with the seat ring 29 is the same as that in the first embodiment. That is, when the valve body 4 is closed, as shown in FIGS. 12A and 12B, even if the seat ring 29 rides on the valve box side seat 8 from either side, FIG. As shown in FIG. 3, the rubber between the two auxiliary rings 31 is pushed toward the valve box side seat 8 to enhance the sealing performance. Other configurations are the same as those in the first embodiment.

  In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, the butterfly valve including the seat rings 17 and 29 according to the present invention is not limited to the liquid ring type including the two valve plates 5, and may be a butterfly valve including a single valve plate. Good. Further, the seat ring is not limited to the seat rings 17 and 29 provided with the two auxiliary rings 19 and 31, but may be provided with one or three or more auxiliary rings.

DESCRIPTION OF SYMBOLS 1 Liquid seal butterfly valve 2 Valve box 4 Valve body 5 Valve plate 8 Valve box side sheet | seat 11 Drainage part 17, 29 Seat ring 18, 30 Seat ring main body 19, 31 Auxiliary ring

Claims (4)

A seat ring body for a butterfly valve, which is attached to the peripheral portion of the valve plate of the butterfly valve and contacts the valve box side seat in the closed state, and is made of a rubber-like elastic body that can be in close contact with the valve box side seat And an auxiliary ring provided integrally with the seat ring body, wherein the auxiliary ring is formed of a material having a hardness higher than that of the seat ring body , and at least an outer peripheral edge of the auxiliary ring is a valve box side seat. A seat ring for a butterfly valve, which is provided so as to be exposed from the seat ring body so as to be able to come into contact .   2. The seat ring for a butterfly valve according to claim 1, wherein a plurality of the auxiliary rings are provided at intervals in a direction parallel to a central axis passing through a central hole of the seat ring body.   A valve box interposed in a pipe line, and a valve body accommodated in a central hole of the valve box, the valve body having a valve plate and a direction perpendicular to the flow path direction of the pipe line Is a butterfly valve that can be opened and closed by rotating the valve rod, and a valve plate on the inner peripheral surface of the valve box. A butterfly characterized in that a valve box side seat protruding in a ring shape is provided so as to receive the peripheral edge of the valve plate, and the butterfly valve seat ring according to claim 1 is mounted on the peripheral edge of the valve plate. valve.   The valve body, the two valve plates are provided integrally with a gap in the plate thickness direction, the valve box side seat is provided in two strips so as to receive the peripheral portions of the two valve plates, The butterfly valve seat ring is mounted on the periphery of each of the two valve plates, and is provided with a pouring / draining portion for pouring and draining into the space surrounded by the inner peripheral surface of the valve box and the two valve plates. The butterfly valve according to claim 3, wherein the butterfly valve is liquid-sealed.

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