JP2013019437A - Soft seal partitioning valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft seal partitioning valve, which is capable of being used while improving leachability by reducing a contact area of a rubber seal material to fluid, and at the same time capable of suppressing the peeling of carbon by the degradation of rubber, and which surely prevents fluid leakage and prevents the excessive fastening of a valve body by exhibiting high sealsability while preventing the coming-out of the rubber sheet by firmly attaching the valve body and the rubber a sheet without using adhesive with high accuracy.SOLUTION: The soft seal partitioning valve opens and closes a flow path 5 of a valve box 2 by sealing a valve seat part 6 and a water stop surface 7 arranged in the valve box 2 by the valve body 1 moving up and down in a crossing direction to the flow path 5 in the valve box 2. In the valve body 1 of the soft seal valve, a rubber lightning is applied to the rubber fixed part 16 arranged in the upper arc site and the lower arc site of the upstream side surface 13 and the downstream side surface 14 of the matrix 10, and the valve body seal part 31 for sealing the valve seat part 6 and the water stop of part 32 pressedly sealing the water stop surface 7 are arranged, respectively.

Description

  The present invention relates to a soft seal gate valve that has a valve body that moves up and down in a crossing direction with respect to a flow path to open and close the flow path, and that performs a valve closing seal with a rubber seal material attached to the valve body.

Conventionally, this type of soft seal gate valve has been widely used in piping of water supply facilities and the like, and has a structure in which water sealing and corrosion prevention are performed with a rubber seal material attached to a valve body. For example, EPDM (ethylene propylene rubber) is often used as the rubber seal material used for the valve body of the soft seal gate valve for water supply. EPDM is a rubber body for soft seal gate valves that are installed in places exposed to harsh environments as rubber materials with excellent water resistance, chemical resistance, and ozone resistance, and that require long life and high reliability. For this reason, it has been adopted not only in Japan but also overseas such as Europe and the United States as an optimal elastomer (rubber-like elastic body) according to standards. And when attaching such a rubber seal material to a valve body, the whole surface is usually attached by rubber lining.
As a soft seal gate valve in which a rubber seal material is attached to a valve body by full-surface rubber lining, for example, a gate valve device of Patent Document 1 is known. In this gate valve device, a rubber lining layer is formed on the entire outer periphery of the valve body, and this rubber lining layer is covered with a fluororesin layer.
In the valve body seat structure of the soft seal valve of patent document 2, the entire rubber lining is given to the flow path side in the valve box in the valve body. Further, in this valve body seat structure, a pair of valve body seats are formed on opposite side portions of the rubber lining in the fluid flow direction. This pair of valve body seats is provided with a wall thickness with the other side protruding from the one side toward the inner surface of the valve box by a predetermined distance, and the compression amount and the surface pressure on the thick side of the rubber lining are less than the thin side. By setting it high, you are trying to prevent excessive tightening.

On the other hand, as this type of soft seal gate valve, a rubber sheet may be partially provided on the valve body. In this case, a rubber seal material is generally fitted to the valve body and attached by a fixing member for attachment.
For example, in the gate valve of Patent Document 3, a V-shaped or U-shaped first packing portion that extends from the lower end surface of the valve body to both side ends, and a second packing portion that continues to the upper end portions of both side surfaces of the valve body. A rubber packing is provided, and this rubber packing is mounted by fitting into a mounting groove formed in the valve body.
In the soft seal gate valve of Patent Document 4, the annular rubber seal material is provided on the outer diameter side of the valve body in a state of being divided into the upstream side and the downstream side of the fluid flow path, and a pair of seal fixing members is provided from above. Thus, the rubber seal material is fixed to the valve body.
In the gate valve of patent document 5, the circumferential direction and groove | channel of the outer peripheral surface of a valve body are formed, and the T-shaped elastic packing is inserted in this groove | channel. Further, in this gate valve, a boss portion is formed in the bonnet, and an overtightening prevention ring is accommodated in an overtightening prevention mechanism accommodation hole provided in the boss portion. When the valve is closed, an overtightening prevention ring is brought into contact with a step portion provided in the overtightening prevention mechanism accommodation hole to prevent damage to the valve box and the valve body when the valve is closed due to overtightening.

JP 2009-275754 A Japanese Patent No. 3423222 JP 11-201299 A JP 2010-216617 A JP-A-6-257679

However, the soft seal gate valve of the entire rubber lining in Patent Document 2 has a contact area between rubber and tap water as compared with other structure valves because the entire surface of the valve body is covered with rubber lining. Since it becomes large, it becomes difficult to satisfy the leachability. In some cases, the leaching test without conditioning is not satisfactory. Even when a rubber seal material such as EPDM suitable for soft seal gate valves is used, deterioration of the rubber seal material on the valve element surface due to residual chlorine in tap water causes carbon in the rubber seal material to peel off and cause tap water. May be mixed in. When the entire rubber lining is applied to the valve body, not only the rubber seal material to be used is increased, but there is also a problem that it is difficult to use an expensive rubber seal material.
Further, in the document 2, since one side of the valve body sheet formed of a rubber material is protruded from the other side to the inner surface of the valve box to prevent excessive tightening, the contact of this small rubber material is avoided. The force at the time of tightening is intensively applied to the contact portion, the amount of compression is excessively increased, and the rubber material becomes weaker and easily breaks. The pair of valve seats is going to be confirmed to be tightened, but this valve seat is made of rubber material, so the reaction force against the operating force is buffered by the elastic force of the rubber material and the valve closed position There is also a problem that makes it difficult to understand.

On the other hand, when the rubber sheet is partially attached to the valve body using fitting or a fixing member as in References 3 to 5, the surface area is reduced to improve the leaching property of the valve body rubber and to prevent chlorine. Although it is possible to design, it is difficult to bring the valve body and the rubber sheet into close contact with each other, so there is a gap between the valve body and the rubber sheet, and leakage occurs. There is a possibility that the rubber sheet peels from the body. In order to prevent this, an adhesive may be applied between the rubber sheet and the valve body, but when applying the adhesive, it should be applied so that it does not protrude beyond the bonded area in order to prevent elution into the fluid. There is a need to. Therefore, it takes time to install the rubber sheet, and the number of work steps increases.
Further, in the document 5, an overtightening prevention mechanism accommodation hole is provided in the boss formed on the lid, and an overtightening prevention ring accommodated in the accommodation hole tries to prevent damage to the valve box and the valve body due to overtightening. As a result, the overall size has increased, the structure has become complicated, and the number of parts has increased.

  The present invention has been developed to solve the above-mentioned problems, and the object of the present invention is to improve the leaching property by reducing the contact area of the rubber seal material to the fluid, and at the same time, carbon due to deterioration of the rubber, etc. The valve body and rubber sheet can be attached closely and precisely without using an adhesive to prevent the rubber sheet from slipping out and exhibit high sealing performance to ensure fluid leakage. Another object of the present invention is to provide a soft seal gate valve that prevents excessive tightening of the valve body.

  In order to achieve the above object, the invention according to claim 1 seals the valve seat portion provided in the valve box and the water stop surface with a valve body that moves up and down in the cross direction with respect to the flow path in the valve box. In a soft seal gate valve that opens and closes the flow path of the valve box, rubber linings are applied to the rubber adhering portions provided on the upper arc and lower end of the base material of the valve body and sealed to the valve seat. This is a soft seal gate valve in which a valve body is configured by providing a valve body seal portion and a water stop portion that press-contact seals against the water stop surface.

  According to a second aspect of the present invention, a central through hole that penetrates the valve stem insertion hole of the base material is formed in a rubber fixing portion provided in an upper arc portion, and a rubber lining is provided through the central through hole to provide a valve body seal This is a soft seal gate valve whose part is integrally formed with a base material.

  According to a third aspect of the present invention, the rubber fixing portion at the upper arc portion is an arc-shaped groove portion, and the stepped surface formed in the central through hole and the valve stem insertion hole which are small holes leaving the arc-shaped groove portion and the engagement surface This is a soft seal gate valve in which a rubber vulcanization molding is performed, and a valve body seal portion swelled in an arc-shaped groove portion and an annular holding portion provided on a step surface are integrally formed through a central through hole.

  According to a fourth aspect of the present invention, there is provided a through hole penetrating the upstream side surface and the downstream side surface of the rubber adhering portion provided in the upper arc portion, and rubber lining is provided through the through hole so that the valve body seal portion is used as the base material. Is a soft seal gate valve formed integrally with In this case, both or one of the central through hole and the through hole is provided in the rubber fixing portion of the upper arc portion.

  In the invention according to claim 5, a groove is formed in the annular lower end surface formed at the lower end of the valve stem insertion hole of the base material and the tapered side surfaces continuing on both sides of the annular lower end surface, and the outer cylinder holding portion is interposed through the groove portion. And an inner cylinder holding part, and a plurality of through parts penetrating the groove part are formed in the outer cylinder holding part, and rubber vulcanization molding is applied to the annular lower end surface and the tapered side surface through the through part to stop water. This is a soft seal gate valve whose part is integrally formed with a base material.

  In the invention according to claim 6, dovetail grooves, recesses or projections are formed in the rubber fixing portions provided in the upper arc portion and the lower end portion of the base material, and rubber is provided in the dovetail grooves, recesses or projections. It is a soft seal gate valve provided with a water stop part by vulcanization molding.

  The invention according to claim 7 is the soft seal gate valve in which one or at least two protrusions are formed to protrude from the seal portion on the tapered side surface.

  The invention which concerns on Claim 8 is a soft seal gate valve which provided the stopper part made from resin or hard rubber in the water stop part.

  In the invention according to claim 9, the surface of the base material is coated with a resin such as polyamide synthetic resin (nylon resin), and a stopper portion is integrally formed on the base material located at the water stop portion. It is the soft seal gate valve made to have.

  The invention according to claim 10 is the soft seal gate valve in which the stopper portion is provided at the pressure contact portion on the taper side surface and the pressure contact portion on the taper side surface protrudes from the stopper portion.

  The invention according to claim 11 is a soft seal gate valve in which a stopper portion is provided integrally or separately at a pressure contact portion between the annular lower end surface and the tapered side surface, and the pressure contact portion between the annular lower end surface and the tapered side surface is projected from the stopper portion. is there.

  The invention which concerns on Claim 12 is the soft seal gate valve which extended the both ends of the stopper part provided in the water stop part to the guide part provided in the both sides of the base material.

  According to the first aspect of the present invention, rubber lining is applied to the upper arc portion and the lower end portion of the upstream side surface and the downstream side surface of the base material of the valve body, and the valve body seal portion that seals the valve seat portion and the water stop surface are pressed against each other. Since the water-stopping part to be sealed is constructed with a partial lining, the contact area of the rubber sealant with fluids such as tap water is reduced. As a result, the odor of tap water and water quality such as total organic carbon (TOC) Improvements can be made, the leaching performance is satisfied even in the leaching test without conditioning, and the amount of black powder generated when the rubber seal material deteriorates can be reduced. In addition, since the sealing portion is provided on the valve body with the rubber lining, the valve body and the rubber sheet are closely attached with high accuracy without using an adhesive to prevent the rubber sheet from being detached. Since the amount of rubber used can be reduced by the configuration of this partial lining, it becomes easy to use high-performance rubber, which makes it possible to extend the life of the valve.

  According to the second aspect of the present invention, the rubber lining is formed through the central through hole and the valve body seal portion is integrally formed with the base material, so that the rubber lining is positioned on the valve body without using an adhesive. The rubber lining can be prevented from being displaced or detached from the valve body, and high sealing performance can be maintained.

  According to the invention of claim 3, rubber vulcanization molding is applied to the stepped surface formed in the arc-shaped groove, the central through hole, and the valve stem insertion hole, leaving the valve body seal part and the annular holding part with the engaging surfaces. Since the valve body seal portion is provided by being integrally molded through the central through hole of the small hole, the valve body seal portion can be firmly integrated with the valve body. When pressure is applied to the valve body seal when the valve is closed, this fluid pressure is rubbed into the arc-shaped groove, the central through hole with the engagement surface, and the valve rod insertion hole. Prevents omission and improves sealing performance.

  According to the invention of claim 4, since the valve body seal portion is integrally formed with the base material by applying rubber lining through the through hole, the valve body seal portion can be more firmly integrated, Therefore, it is possible to reliably prevent the valve body seal from being displaced or peeled off and improve the sealing performance.

  According to the invention which concerns on Claim 5, since the rubber | gum vulcanization molding is given to the cyclic | annular lower end surface and the taper side surface through the penetration part, and the water stop part is integrally molded to a preform | base_material, it is in the lower end part of a valve body. The water stop part can be firmly integrated. When fluid pressure is applied to the water-stop part, the fluid pressure is received by the metal surface on the groove side of the inner cylinder holding part and the tapered side surface via vulcanized rubber. The sealability can be improved while preventing omissions.

  According to the invention according to claim 6, by providing a dovetail groove or a recess or a projection on the base material, by vulcanizing and molding rubber in the dovetail groove or the recess or the projection, Rubber lining can be applied by various structures. In this case, even if the opening / closing operation of the valve body is repeated, the rubber can be surely prevented from peeling and coming out, and the sealing function when the valve is closed can be maintained.

  According to the invention which concerns on Claim 7, the adhesiveness to the water stop surface of the taper side surface at the time of valve closing can be improved, and the outstanding sealing performance can be exhibited by raising the surface pressure at the time of clamping | tightening, and it can prevent leak reliably.

  According to the invention which concerns on Claim 8 or Claim 9, the burden concerning the water stop part which carries out a pressure-contact seal on a water stop surface is reduced, and it prevents that a water stop part is damaged or fracture | ruptured. A stopper made of resin or hard rubber with a hardness different from that of the rubber material that constitutes the water stop part or a stopper part by resin coating on the base material is provided, making it easier to check the sensation when the valve body is closed . For this reason, excessive tightening of the valve body can be prevented, and consumption and damage of the rubber can be prevented.

  According to the tenth aspect of the present invention, since the pressure contact portion of the tapered side surface comes into contact with the water stop surface before the stopper portion when the valve body is closed, the stopper portion comes into contact suddenly after the rubber is elastically deformed. The difference in the deadline is generated to prevent excessive tightening of the valve body and to prevent damage and breakage due to excessive deformation of the pressure seal part located on the side of the taper to maintain the sealing performance when the valve is closed it can.

  According to the eleventh aspect of the invention, when the valve body is closed, the annular lower end surface and the pressure contact portion of the tapered side surface abut against the water stop surface before the stopper portion. Thus, excessive tightening of the valve body can be surely prevented, and the occurrence of flaws and breakage due to excessive deformation of the press contact seal portion located on the tapered side surface and the annular lower end surface can be prevented, and the sealing performance when the valve is closed can be maintained.

  According to the invention which concerns on Claim 12, since a guide part contacts a water stop surface via the extension site | part of a stopper part at the time of valve body deadline, preventing the surface treatment performed to the valve body and the valve case from being damaged. The completion of the deadline can be easily confirmed.

It is a longitudinal section showing a 1st embodiment of a soft seal gate valve of the present invention. It is a center longitudinal cross-sectional view of FIG. It is a partially omitted enlarged sectional view showing the valve closed state of the soft seal gate valve. It is a perspective view which shows a valve body. It is a front view which shows a valve body. It is a center longitudinal cross-sectional view of FIG. It is a partially expanded sectional view which shows the center through-hole vicinity of FIG. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. (A), (b) is CC sectional drawing in FIG. FIG. 6 is a bottom view of FIG. 5. It is a perspective view which shows a base material. It is a front view of FIG. It is the center longitudinal cross-sectional view of FIG. It is the schematic diagram which showed rubber lining. It is a center longitudinal cross-sectional view which shows the valve body of 2nd Embodiment of the soft seal gate valve of this invention. It is a center longitudinal cross-sectional view which shows the valve body of 3rd Embodiment of the soft seal gate valve of this invention. (A) is a bottom view which shows the valve body of 4th Embodiment of the soft seal gate valve of this invention, (b) is a longitudinal cross-sectional view which shows the valve body of 4th Embodiment of the soft seal gate valve of this invention. is there. (A) is a bottom view which shows the valve body of 5th Embodiment of the soft seal gate valve of this invention, (b) is a longitudinal cross-sectional view which shows the valve body of 5th Embodiment of the soft seal gate valve of this invention. is there. It is a principal part expanded sectional view which shows the other example of a stopper part. It is a bottom view of FIG.

  Embodiments of a soft seal gate valve according to the present invention will be described below in detail with reference to the drawings. 1 shows an embodiment of the soft seal gate valve of the present invention, FIG. 2 shows a central longitudinal sectional view of FIG. 1, and FIG. 3 shows a closed state of the soft seal gate valve.

  As shown in the figure, the soft seal gate valve of the present invention has a valve body 1, a valve box 2, a lid 3, and a valve stem 4, and the valve body 1 is connected to a flow path 5 in the valve box 2. The valve rod 4 is mounted so as to be movable up and down in the cross direction. The valve body 1 is rubber-lined with a rubber material such as EPDM or fluororubber, and the valve seat 6 and the water-stopping surface 7 provided in the valve box 2 are sealed with this rubber lining to thereby seal the valve box 2. The flow path 5 is opened and closed.

  The valve body 1 in FIGS. 4 to 11 has a base material 10 shown in FIGS. 12 to 14. The base material 10 is, for example, spheroidal graphite cast iron (for example, FCD450-10) or stainless steel (SCS). It is cast-molded by a material such as. The base material (for example, spheroidal graphite cast iron) 10 is subjected to a surface treatment to be provided with a surface treatment unit 11, which is, for example, a fluidized immersion / electrostatic powder coating of a resin such as epoxy / polyamide resin. Or, it is provided by scissors processing. Of these, an appropriate surface treatment unit 11 may be applied to the base material, but it is particularly desirable to provide the surface treatment unit 11 by processing an epoxy-polyamide resin by fluid immersion. In this case, compared to the surface treatment by electrostatic powder coating of epoxy / polyamide resin, the film thickness is uniform and stable, and the surface cracking is less likely to occur than in the case of glazing by baking glass. It becomes easy to handle during transportation. As a result, when the rubber lining is applied, damage to the surface treatment portion 11 exposed to the flow path 5 is suppressed as much as possible. It becomes possible to perform vulcanization molding while improving the adhesion accuracy of the rubber material with respect to the uniform film thickness of the surface treatment portion 11.

  In this way, by applying resin coating such as polyamide synthetic resin (nylon resin) on the surface of the base material 10, this resin is positioned on the water stop portion 32, which will be described later, and the stopper portion 36 integrally formed with the base material 10. The stopper function can be demonstrated by painting.

  As shown in FIG. 14, the base material 10 has a valve stem insertion hole 12, an upstream side surface 13 and a downstream side surface 14 positioned on both sides of the valve rod insertion hole 12, and a wedge having a symmetrical shape with respect to the flow path 5. Provided in the mold. The valve stem insertion hole 12 is provided so as to penetrate through the central position of the base material 10, and a stepped surface 15 having a slightly enlarged diameter is formed on the upper side of the valve stem insertion hole 12. A rubber adhering portion 16 shown in FIG. 13 is provided on the upper arc portion and the lower end portion of the upstream side surface 13 and the downstream side surface 14 of the base material 10. Among these, the rubber adhering portion 16 in the upper arc portion is formed by an arc-shaped groove portion, and has a central through hole 17 and a through hole 18 which are small holes leaving the engagement surface 17a. Guide portions 19 are formed on both sides of the base material 10.

  In FIG. 14, the central through hole 17 penetrates the valve stem insertion hole 12 of the base material 10 and is formed at a substantially central position of the arcuate groove portion 16 smaller than the groove width. In FIG. 13, the through holes 18 are provided symmetrically about the central through hole 17 so as to penetrate the upstream side surface and the downstream side surface of the rubber fixing portion 16 provided in the upper arc portion. In the present embodiment, the four through holes 18 are formed in the shape of a long hole, but the number of the through holes 18 can be increased or decreased or provided in different hole shapes. Even in that case, it is desirable to arrange the symmetrical through-hole 18 around the central through-hole 17. In this case, the rubber is securely fixed to the central through hole 17 while the rubber is engaged with the engaging surface 17a.

  The guide portions 19 are formed so as to protrude from both sides of the valve body 1 and are fitted in the guide grooves 20 formed on both sides inside the valve box 2 in a loosely fitted state. By mounting the valve body 1 at a predetermined position of the valve box 2 in this way, the valve body 1 can move up and down in the valve box 2. Although not shown, the contact surface of the guide portion 19 with the guide groove is an inclined surface slightly inclined from the upper side to the lower side with respect to the direction in which the valve stem 4 moves up and down. The inclination of the contact surface will be described later. It is desirable to provide the same inclination as the inclination of the valve body 1 due to the fluid pressure.

  On the other hand, an annular lower end surface 25 and a tapered side surface 26 are provided at the lower end portion of the rubber fixing portion 16 of the base material 10 as shown in FIG. The annular lower end surface 25 is formed at the lower end of the valve stem insertion hole 12 of the base material 10, and the tapered side surface 26 is formed so as to be inclined from the annular lower end surface 25 continuously from both sides of the annular lower end surface 25. As shown in FIG. 12, a groove portion 27 is formed between the annular lower end surface 25 and the tapered side surface 26, and this groove portion 27 is an outer cylinder holding member in which a taper holding portion 28 a is extended at the lower end portion of the base material 10. A portion 28 and an inner cylinder holding portion 29 extending from the partition wall 29a are formed. Further, the outer cylinder holding portion 28 and the taper holding portion 28a are formed with a plurality of elongated holes 30 penetrating the groove 27. Similar to the above-described through holes 18, the number and shape of the through portions 30 can be arbitrarily set. Even in such a case, it is desirable to provide it symmetrically with respect to the base material 10 like the through hole 18.

When the valve body 1 is manufactured, a rubber material is vulcanized and formed on the rubber fixing portion 16 of the base material 10 described above. Thereby, as shown in FIGS. 4 to 6, a valve body seal portion 31 that seals the valve seat portion 6 and a water stop portion 32 that presses and seals against the water stop surface 7 are provided. At this time, the valve body seal part 31 and the water stop part 32 are simultaneously molded.
At that time, on the upper arc portion side of the base material 10, the valve body seal portion 31 is integrally formed with the base material 10 by applying a rubber lining through the central through hole 17 shown in FIG. 7. Specifically, the valve body seal bulged into the arcuate groove 16 as shown in FIGS. 6 and 7 by subjecting the arcuate groove 16, the central through-hole 17 and the step surface 15 to rubber vulcanization molding. An annular holding portion 33 is provided on the portion 31 and the stepped surface 15, and these are integrally provided via the central through hole 17. Thus, the valve body seal portions 31, 31 on the upstream side surface 13 and the downstream side surface 14 are integrated by the central through hole 17 and the annular holding portion 33.

  At the same time, as shown in FIGS. 8 and 9, rubber lining is also applied to the through hole 18, so that the valve body seal portions 31, 31 on the upstream side surface 13 and the downstream side surface 14 pass through the through hole 18. Integrated. In this way, the valve body seal portion 31 at the upper arc portion is integrally formed with the base material 10 via the arc-shaped groove portion 16, the central through hole 17, the stepped portion surface 15, and the through hole 18.

  On the other hand, on the lower end portion side of the base material 10, the water stop portion 32 is integrally formed with the base material 10 by applying rubber lining to the annular lower end surface 25 and the tapered side surface 26 through the through portion 30 in FIG. 12. The Specifically, by applying rubber vulcanization to the groove portion 27 from the outside of the outer cylinder holding portion 28 through the through portion 30, the water stop portion 32 is integrally formed with the annular lower end surface 25 and the tapered side surface 26.

  In this case, as shown in FIGS. 11 and 12, two protruding portions 35, 35 may be formed to protrude from the sealing portion of the tapered side surface 26 with the water stop surface 7. In this case, when the valve body 1 is closed, the two protrusions 35 and 35 can contact and seal against the water stop surface 7. Further, a stopper 36 which will be described later is disposed between the two protrusions 35 and 35.

  As shown in the schematic diagram of the rubber lining in FIG. 15, the vulcanized rubber material provided in the valve body seal portion 31 and the water stop portion 32 is integrally connected in the arc-shaped groove portion 16 and the tapered side surface 26. When the rubber vulcanization molding is performed, the valve body seal portion 31 and the water stop portion 32 are molded at a time as described above. Thus, the valve body seal part 31 and the water stop part 32 are integrally formed in an annular shape in the crossing direction of the flow path 5, and the rubber material portion exposed to the flow path 5 side is minimized.

  When the rubber vulcanization molding is performed, the valve body 1 can be processed by vulcanization molding without applying an adhesive, and the rubber material can be firmly fixed and adhered to the base material 10 by the rubber vulcanization molding. The function of can be fully demonstrated. Further, when considering the secular change of the rubber lining, rubber vulcanization molding may be performed by vulcanization adhesion in which vulcanization molding is performed while applying an adhesive.

  The stopper portion 36 shown in FIGS. 3 and 4 is made of resin, hard rubber, or resin coating, and is provided symmetrically on the tapered side surfaces 26 and 26 around the annular lower end surface 25 in the water stop portion 32. ing. The stopper portion 36 is formed of a material having a higher hardness than the rubber material forming the water stop portion 32. In addition, in this embodiment, the stopper portion 36 is provided at the pressure contact portion of the tapered side surface 26, and the pressure contact portion of the taper side surface 26 is formed to protrude from the stopper portion 36.

  3 and 10, the stopper portion 36 includes a contact surface 37 that faces the water blocking surface 7, holding portions 38 and 38 that extend vertically from both sides of the contact surface 37, and the holding portions 38 and 38. Are formed in a substantially U-shaped cross section. The contact surface 37 can contact the water stop surface 7 when the press contact portion of the tapered side surface 26 is deformed by being pressed against the water stop surface 7. The holding portion 38 is held between the base material 10 and the rubber lining portion, and the stopper portion 36 is integrated with the base material 10 by holding the holding portion 38. The reinforcing portion 39 is provided so as to connect the holding portions 38, 38 to reinforce the holding portion 38, and the reinforcing portion 39 is fitted and mounted in the mounting groove 10 a formed in the base material 10. Thus, the stopper portion 36 can be positioned.

  The stopper portion 36 is temporarily attached to a predetermined position of the base material 10 that has been surface-treated so that the lower end portion is sandwiched between the holding portions 38 and 38 while the reinforcing portion 38 is fitted in the mounting concave groove 10a. Furthermore, by applying a partial rubber lining to the integrated base material 10 and the stopper portion 36 by vulcanization molding, these are integrated in a state where the stopper portion 36 is prevented from coming off from the base material 10. The

  If the stopper part 36 mentioned above can contact | abut on the water stop surface 7 at the time of closing of the valve body 1, it can be arrange | positioned in the arbitrary positions of the water stop part 32, and this stopper part 36 is abbreviate | omitted. Is also possible. When the stopper portion 36 is provided, it can also be applied to a valve body other than the valve body of the partial rubber lining as in the present embodiment. For example, for a valve body of a type in which a rubber seal material is attached by full-surface rubber lining or fitting. In the same manner as described above, a stopper portion can be provided. Also in this case, the function by the stopper portion can be exhibited as in the case of the partial rubber lining.

  When the valve body 1 is mounted on a valve box, the valve body 1 is attached to be movable up and down via a valve rod 4 and a female screw top 41 as shown in FIG. The valve stem 4 is made of, for example, stainless steel, and a screw portion 42 made of a male screw is provided on a part of the outer periphery thereof. An annular flange 43 is formed on the upper side of the valve stem 4, and the valve stem 4 is mounted in a state where the annular flange 43 abuts on the lid 3 for covering the valve box 2. For this reason, the valve stem 4 rotates with respect to the valve box 2 while being prevented from moving up and down. In FIG. 1 and FIG. 2, a buffer member 45 such as a thrust washer is interposed between the annular flange 43 and the lid 3, and the annular flange 43 and the lid 3 are in direct contact with each other by the buffer member 45. It is prevented.

  The valve box 2 and the lid 3 shown in the figure are formed by using, for example, spheroidal graphite cast iron such as FCD450-10, and the entire surface thereof is coated with epoxy resin as in the case of the valve body 1. Is done. The valve box 2 and the lid 3 are fixed by a fixing member 57 such as a bolt via a rubber seal member 46.

The female thread top 41 is made of, for example, a copper alloy, and has a female threaded portion 47 that is screwed into the threaded portion 42 on the inner periphery, and a hook-shaped locking portion 48 formed on the upper side of the valve body 1 in FIG. It is housed inside the door in a retaining state. When the valve stem 4 is rotated in the valve closing or valve opening direction, the rotation of the guide portion 19 is regulated by the guide groove 20, so that the valve body 1 is moved to the valve stem 4 by the screwing of the screw portion 42 and the female screw portion 47. Move up and down. A connecting portion 49 for reinforcing the engaging portion 48 is formed on one side of the engaging portion 48 of the valve body 1, but the connecting portion 49 may be omitted. In this case, the valve body 1 is symmetrical in the flow path direction.
Although the valve stem 4 is manually rotated by a handle (not shown), the valve stem 4 can be automatically operated by an electric actuator or the like (not shown).

  As shown in FIG. 1, in the soft seal gate valve in this embodiment, the screw portion 42 of the valve stem 4 is hidden in the valve box 2 and the valve stem 4 rotates at a fixed position when the valve body 1 is opened and closed. It is a type gate valve. Although not shown, the soft seal gate valve may have an external screw type gate valve structure. In the external thread type gate valve, the threaded portion of the valve stem is located outside the valve box, and the valve stem is raised by opening the valve and lowered by closing.

  In addition, as shown in FIG. 3, this soft seal gate valve moves the wedge-shaped valve body 1 (base material 10) up and down relative to the valve box 2 to close the flow path 5 with the valve body 1. The valve body seal portion 31 and the water stop portion 32 are sealed with the valve seat portion 6 and the water stop portion 7 in a so-called wedge-shaped structure, but the valve body is limited to the wedge shape. There is nothing. For example, although not shown in the drawings, a so-called pressure-bonding type in which a valve body in which the upstream side surface and the downstream side surface are substantially parallel is moved up and down so that the valve body seal portion is pressure-bonded to the valve seat portion of the valve body to close the valve. It can also be used as a gate valve.

  In addition, although not shown, the guide parts on both sides of the valve body are provided in a groove shape, and the valve body is mounted on the valve box so that a convex guide part (not shown) formed on the valve box is loosely fitted in the groove-like guide part. May be. The structure of the guide part is not limited as long as the guide part can be slid in the vertical direction in a state where the valve body 1 is stopped by the rotation of the valve rod 4 as described above.

  In the soft seal gate valve of the present invention, a rubber lining is applied to the rubber adhering portion 16 at the upper arc portion and the lower end portion of the upstream side surface 13 and the downstream side surface 14 of the base material 10, and the valve body seal portion 31 and Since each of the water stop portions 32 is provided, a sealing portion of the valve body by partial rubber lining can be configured. Thereby, the rubber material which contacts fluids, such as a tap water, can be decreased, and especially the rubber material exposed to the fluid side can be suppressed to the minimum when the valve is closed. As a result, the leachability can be improved, and at the same time, the exfoliation of carbon or the like due to the deterioration of the rubber material of the valve body seal portion 31 and the water stop portion 32 can be minimized.

  As described above, since the usage fee of the rubber material can be minimized, it is possible to use an expensive rubber material with higher performance. In this case, the weight of the entire soft seal gate valve can be reduced as compared with the case where the rubber seal material is provided using the entire surface rubber lining or the fixing member for attachment.

  The rubber fixing portion 16 at the upper arc portion is formed by an arc-shaped groove portion, and the arc-shaped groove portion 16, the central through hole 17, and the stepped surface 15 of the valve rod insertion hole 12 are subjected to rubber vulcanization molding, and the valve body seal portion 31. Since the annular holding portion 33 is integrally formed through the central through hole 17, the valve body seal portions 31, 31 on the upstream side surface 13 and the downstream side surface 14 are integrated with the annular holding portion 33 being prevented from coming off. it can. Further, the rubber vulcanization molding is performed on the through-hole 18 so that the valve body seal portions 31 and 31 on the upstream side surface 13 and the downstream side surface 14 are integrally molded on the base material 10, so that the base material 10 is fixed and arc-shaped. The valve body seal part 31 fitted in the groove part 16 can be integrated. Accordingly, the rubber material is firmly fixed to the base material 10 without using an adhesive in rubber vulcanization molding, and the valve body seal portion 31 is prevented from being displaced or peeled off from the arc-shaped groove portion 16, and the valve Prevents the gap between the body 1 and the valve body seal portion 31, and can exhibit higher sealing performance than the case of partial rubber sheet mounting that uses fitting or mounting fixing members, and the adhesive elutes into the fluid. Therefore, the number of work steps by applying the adhesive is not increased. Furthermore, it is not necessary to perform an adhesive leaching test as in the case of vulcanization bonding.

  On the other hand, at the lower end portion of the valve body 1, a groove portion 27 is formed in the annular lower end surface 25 and the tapered side surface 26, and an outer cylinder holding portion 28 and an inner cylinder holding portion 29 are provided via the groove portion 27. A plurality of penetrating portions 30 penetrating the groove portion 27 are formed in the holding portion 28, and rubber vulcanization molding is performed on the annular lower end surface 25 and the tapered side surface 26 via the penetrating portion 30 to form the water stop portion 32 as a base material. Since the outer cylinder holding part 28 is wound around the outer cylinder holding part 28 with a rubber material provided in the groove part 27, the water stop part 32 can be integrated via the through part 30. For this reason, as in the case of the valve body seal portion 31, the water stop portion 32 is not displaced or peeled off, and the water stop portion 32 can be firmly fixed to the base material 10.

  In addition, the valve body seal portion 31 and the water stop portion 32 are integrally formed, and the rubber material is less likely to come off from the base material 10 by vulcanizing and forming the annular seal portion around the base material 10. It has become. Therefore, it is possible to prevent the rubber material from being displaced or detached even when the valve body 1 moves up and down and is seated on or separated from the valve seat portion 6. In this case, since the valve body 1 is provided in a wedge shape, when the valve body 1 is lowered from the valve open state of FIG. 2 to the valve closed state of FIG. The seal part 31 and the water stop part 32 are not rubbed into the valve box 2. For this reason, the wear of the valve body seal part 31 and the water stop part 32 is suppressed to the minimum, the consumption of the rubber material is reduced, and the sliding resistance during the operation of the valve body 1 is also reduced.

  Since the stopper portion 36 is provided at the pressure contact portion of the taper side surface 26 of the water stop portion 32 and the pressure contact portion of the taper side surface 26 protrudes from the stopper portion 36, at the time of valve closing seal in FIG. When the pressure contact portion abuts against the water stop surface 7 and the valve body 1 is subsequently tightened, the stopper portion 36 abuts against the water stop surface 7 as the valve body 1 is lowered while the pressure contact portion is deformed by the elasticity of the rubber material. Since the stopper portion 36 is made of resin, hard rubber, or resin coating, it is less likely to be deformed than a rubber material when it comes into contact with the water stop surface 7. Thereby, although the contact area of a press contact part becomes small by forming a partial lining structure and the protrusion part 35, the excessive deformation | transformation of the press contact part in the taper side surface 26 can be prevented, and the burden of the water stop part 32 is carried out. It can reduce and can prevent this water stop part 32 from being damaged or broken. The stopper portion 36 makes it difficult for the surface treatment portion of the valve box 2 to be peeled off.

  When the closing of the valve body 1 is completed, the stopper material 36, which is harder than the rubber material forming the water stopping portion 32, comes into contact with the water stopping surface 7 so that the rubber material, which is an elastic material, is gradually deformed compared to the case where the valve material 1 is closed. Torque changes rapidly. For this reason, the feeling at the time of deadline becomes easy to be transmitted, and the deadline completion state of the valve body 1 can be surely grasped.

  Since the two ridges 35, 35 project from the sealing portion of the tapered side surface 26, the ridge 35 is pressed against the water stop surface 7 in a line contact state when the valve is closed. The surface pressure at the time of tightening is increased by the pressure contact according to the area, so that the adhesion can be improved and the high sealing performance can be exhibited. In this case, the number of protrusions may be one.

  In that case, in FIG. 1, by providing the two ridges 35, the pressure contact force of the ridges 35 to the water stop surface 7 can be increased, and leakage can be surely prevented. In this case, the above-described stopper portion 36 prevents the ridge portion 35 from being broken by a strong pressure contact force.

  Further, the contact portion of the guide portion 19 with the guide groove 20 is slightly inclined from the upper side to the lower side with respect to the vertical movement direction of the valve rod 4, and the inclination of the contact portion is determined by the fluid pressure of the valve body 1. By providing at the same inclination as the inclination, the contact portion contacts the guide groove 20 by surface contact when the valve body 1 is inclined by the fluid pressure. This surface contact is not limited to the valve closed state, and is continued by the fluid pressure when the valve body 1 is moved up and down. For this reason, it is possible to prevent the guide portion 19 and the guide groove 20 from being in extreme contact with each other and prevent the surface treatment 19 of the guide portion of the valve body 1 from being damaged or peeled off. The body 1 can be moved up and down smoothly. By preventing the surface treatment 19 of the guide part from being peeled off, the base material 10 can be prevented from generating rust.

  The fluid pressure acts on the surface treatment section 11, the valve body seal section 31, and the water stop section 32 in the valve body 1. At this time, the sealing property between the valve body 1 and the valve box 2 is the valve body seal section. 31 and the water stop part 32 are exhibited by sealing or pressure-contacting the valve seat part 6 and the water stop surface 7. In the valve body seal portion 31, the fluid pressure transmitted to the valve body seal portion 31 is directly received by the base material 10 in a portion where the central through hole 17 and the through hole 18 in the upper arc portion are not provided, and the force due to this fluid pressure is applied from the valve body 1. It is transmitted to the valve seat 6. Since the base material 10 is located on the secondary side in this way, the base material 10 receives the force of fluid pressure to prevent the rubber material from slipping out toward the inside of the valve body. And the base material 10 are in close contact with each other and exhibit high sealing performance.

  In the vicinity of the through hole 18 in the upper arc portion, fluid pressure is transmitted from the upstream rubber lining portion to the downstream rubber lining portion through the through hole 18, and the force by the fluid pressure is transmitted to the valve seat portion 6. Thus, the valve seat portion 6 is positioned on the secondary side of the through hole 18, and the valve seat portion 6 receives the force of fluid pressure to prevent the rubber material from coming out to the secondary side.

On the other hand, in the water stop portion 32, the fluid pressure transmitted to the water stop portion 32 is directly received by the taper holding portion 28 a and the outer cylinder holding portion 28 in a portion where the through portion 30 in the lower end portion is not present. For this reason, the rubber material in the vicinity exhibits a high sealing property because the rubber material and the base material 10 are in close contact with each other by the fluid pressure.
In the vicinity of the penetrating portion 30 at the lower end portion, the fluid pressure is transmitted to the rubber lining portion applied to the groove portion 27 via the penetrating portion 30. Since the inner cylinder holding part 29 and the partition wall 29a are provided on the secondary side of the rubber lining portion, the force due to the fluid pressure is received by the inner cylinder holding part 29 and the partition wall 29a so that the rubber is fixed. Hold. Thus, since the inner cylinder holding part 29 and the partition wall 29a are located on the secondary side of the rubber lining part provided in the groove part 27, the rubber material can be surely pulled out to the secondary side in this part. It is preventing.

In addition, a rubber adhering portion having the shape of the arc-shaped groove portion 16 is formed in the valve body 1, and the valve-body seal portion 31 is provided by subjecting the arc-shaped groove portion 16 to rubber vulcanization. Even when friction such as sliding occurs in the valve box 2 while maintaining the pressure, the rubber material is prevented from being displaced by the structure mounted so as to be surrounded by the arc-shaped groove 16. Since the water stop portion 32 is provided integrally with the valve body seal portion 31, the water stop portion 32 is also difficult to be displaced from the valve body.
By providing the valve body 1 with such a partial rubber lining structure, for example, in a durability test of a soft seal gate valve for water supply (JWWA B 120) according to the standards of the Japan Water Works Association, the valve body is fully opened and fully closed. Even if it is repeated 500 times or more, it can be avoided that the valve body seal part 31 and the water stop part 32 come out or leak due to the deterioration of the sealing performance, and the water stop performance as a soft seal gate valve over a long period of time. Can be maintained.

  Since the buffer member 45 is provided between the annular flange 43 and the lid 3 of the valve rod 4, when the valve rod 4 is rotated when the valve body 1 moves up and down, the buffer member 45 receives a thrust load, and the annular rod The peeling of the surface treatment of the lid 3 due to the rotation of the portion 43 is prevented.

  In FIG. 16, the valve body of 2nd Embodiment of the soft seal gate valve of this invention is shown. In the following embodiments, the same portions as those in the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, a convex portion 53 is formed on the annular lower end surface 51 of the fixing portion 16 at the lower end portion of the base material 50 and a tapered side surface 52 that continues to both sides of the annular lower end surface 51, and a rubber material is formed on the convex portion 53. A water stop portion 54 is provided by vulcanization molding. As shown in the figure, the convex portion 53 has a dovetail groove 55, and thus the valve body 56 moves up and down in the valve box by subjecting the convex portion 53 having the dovetail groove 55 to rubber vulcanization molding. This rubber material is also difficult to peel off.

In FIG. 17, the valve body of 3rd Embodiment of the soft seal gate valve of this invention is shown. In this embodiment, a concave portion 63 is formed in the fixing portion 16 on the annular lower end surface 61 and the tapered side surface 62 of the base material 60, and a rubber material is vulcanized and formed in the concave portion 63 to provide a water stop portion 64. . In this case, by providing a narrower opening side of the recess 63, the rubber vulcanization molding applied to the recess 63 is less likely to come off when the valve body 65 moves up and down.
As described above, either a dovetail groove, a concave portion or a convex portion for rubber vulcanization molding is formed in the rubber fixing portion 16 provided in the upper arc portion and the lower end portion of the base material, and the dovetail groove or the concave portion is formed. Or a water stop part can also be provided in a convex part.

  Further, in the embodiment of FIG. 16, a bottomed and concave mounting groove 57 is formed in the upper circular arc portion, and the valve body seal portion 58 is configured while the rubber downstream molding is applied to the mounting groove 57 in a waveform, while FIG. In this embodiment, a bottomed concave portion 66 is formed in the upper arc portion, and the valve body seal portion 67 is formed while rubber vulcanization molding is performed on the concave portion 66, thereby preventing the rubber material from peeling or coming out. It can be done. As described above, a bottomed rubber material mounting portion may be provided in the upper arc portion, and the rubber material lining may be applied to the rubber material mounting portion to provide the valve body seal portion. Even at this time, the same performance as the soft seal valve having the structure in which the central through hole and the through hole are provided in the base material can be exhibited.

In FIG. 18, the valve body of 4th Embodiment of the soft seal gate valve of this invention is shown. The stopper portion 70 in this embodiment includes an annular stopper portion 72 located on the annular lower end surface 71, a tapered stopper portion 77 having a contact surface 74 located on each tapered side surface 73, 73, a holding portion 75, and a reinforcing portion 76. The taper stopper portion 77 is integrally formed symmetrically with the annular stopper portion 72 so as to have an arc shape.
In this soft seal gate valve, the stopper portion 70 is integrally provided at the pressure contact portion between the annular lower end surface 71 and the tapered side surface 73 of the valve body 78, and the pressure contact portion between the annular lower end surface 71 and the tapered side surface 73 protrudes from the stopper portion 70. It is provided in the state.

  When the valve is closed, the contact portion of the annular stopper portion 72 and the contact surface 74 of the stopper portion 70 abut against a water stop surface (not shown), thereby preventing excessive deformation of the pressure contact portion of the annular lower end surface 71 and the entire tapered side surface 73. However, the water stop portion 79 seals the water stop surface, and prevents the entire water stop portion 79 from being scratched or broken, thereby maintaining a high sealing performance. In this embodiment, an integral stopper portion 70 is used, but an annular stopper portion and a taper stopper portion (not shown) are formed separately, and are provided at the pressure contact portions of the annular lower end surface and the tapered side surface, respectively. You may make it protrude from each stopper part with the press-contact part of a side surface.

  In FIG. 19, the valve body of 5th Embodiment of the soft seal gate valve of this invention is shown. The stopper portion 80 in this embodiment has a taper stopper portion 81 positioned on each tapered side surface 73, and these taper stopper portions 81 are connected by a connection portion 82 and formed in an arc shape. Further, the extending portion 83 is formed in the stopper portion 80, and the extending portion 83 is formed by extending both ends of the tapered stopper portion 81 provided on the tapered side surface 73 of the water stop portion 79 to the guide portion 19. ing.

  When the valve body 85 is closed, the guide portion 19 comes into contact with a water stop surface (not shown) through the extending portion 83, so that the end face side of the guide portion 19 and the water stop surface do not come into direct contact with each other. And since the extension part 83 exhibits the function as a buffering agent, it can prevent that the guide part 19 and a water stop surface are damaged. Furthermore, since the guide portion 19 is in contact with the water stop surface via the extending portion 83 when the valve body deadline is completed, the valve body 85 can be forcibly prevented from descending further. For this reason, it is possible to operate to a predetermined closing state by rotating a valve rod (not shown) to a position where the rotation stops without confirming the sense of closing the valve body.

  20 and 21 show other examples of the stopper portion. As shown in the figure, a gap portion 93 is formed between the stopper portion 90 and the protrusion 35 around the contact surface 91 that contacts a water stop surface (not shown), and the contact surface 91 is a protrusion. It extends so as to be slightly closer to the tip side of the portion 35. In this stopper part 90, it is possible to prevent the water stop surface from being damaged by minimizing the amount of elastic deformation of the protrusion 35 by abutting the contact surface 91 with the water stop surface quickly. In addition, since the gap portion 93 is provided, the protruding portion 35 is easily elastically deformed toward the gap portion 93, so that the compressive force applied to the protruding portion 35 can be reduced.

DESCRIPTION OF SYMBOLS 1 Valve body 2 Valve box 5 Flow path 6 Valve seat part 7 Water stop surface 10 Base material 12 Valve rod insertion hole 13 Upstream side surface 14 Downstream side surface 15 Step part surface 16 Rubber | gum fixed part 17 Central through-hole 17a Engagement surface 18 Through-hole 19 Guide part 25 Annular lower end face 26 Tapered side face 27 Groove part 28 Outer cylinder holding part 29 Inner cylinder holding part 30 Through part 31 Valve body seal part 32 Water stop part 33 Annular holding part 35 Projection part 36 Stopper part 53 Convex part 63 Concave part

Claims (12)

  A soft seal gate valve that opens and closes a flow path of the valve box by sealing a valve seat portion and a water stop surface provided in the valve box with a valve body that moves up and down in a cross direction with respect to the flow path in the valve box. The valve body sealing portion for sealing the valve seat portion with a rubber lining on the rubber fixing portions provided on the upper arc portion and the lower end portion of the upstream side surface and the downstream side surface of the base material of the valve body and the water stop surface A soft seal gate valve characterized in that the valve body is configured by providing a water stop portion for sealing.   A central through hole penetrating the valve stem insertion hole of the base material is formed in a rubber fixing portion provided in the upper arc portion, and a rubber lining is applied through the central through hole to connect the valve body seal portion to the base material. The soft-seal gate valve according to claim 1, which is integrally formed with the valve.   The rubber adhering portion of the upper arc portion is an arc-shaped groove portion, and rubber vulcanization molding is performed on the stepped portion surface formed in the central through hole and the valve stem insertion hole which are small holes leaving the arc-shaped groove portion and the engagement surface. The soft seal gate valve according to claim 2, wherein the valve body seal portion bulged in the arc-shaped groove portion and the annular holding portion provided on the stepped portion surface are integrally molded through the central through hole. .   A through hole penetrating the upstream side surface and the downstream side surface of the rubber fixing portion provided in the upper arc portion is provided, and the valve body seal portion is integrally formed with the base material by applying a rubber lining through the through hole. Item 2. The soft seal gate valve according to item 1.   A groove is formed in the annular lower end surface formed at the lower end of the valve stem insertion hole of the base material and the tapered side surface continuing on both sides of the annular lower end surface, and the outer cylinder holding portion and the inner cylinder holding portion are formed through the groove portion. A plurality of through portions penetrating into the groove portion are formed in the outer cylinder holding portion, and rubber vulcanization molding is performed on the annular lower end surface and the tapered side surface through the through portion, and the water stop portion is The soft seal gate valve according to any one of claims 2 to 4, wherein the soft seal gate valve is formed integrally with a base material.   A dovetail groove, a concave portion or a convex portion is formed in a rubber adhering portion provided in an upper arc portion and a lower end portion of the base material, and rubber is vulcanized and formed in the dove groove, the concave portion or the convex portion. The soft seal gate valve according to claim 1, wherein a water portion is provided.   The soft seal gate valve according to claim 5 or 6, wherein one or at least two protrusions are formed to protrude from the sealing portion on the tapered side surface.   The soft seal gate valve according to any one of claims 1 to 7, wherein a stopper portion made of resin or hard rubber is provided in the water stop portion.   Claims wherein the base material surface is coated with a resin such as polyamide synthetic resin (nylon resin), and a stopper portion is formed integrally with the base material located at the water stop portion, and the resin coating has a stopper function. Item 8. The soft seal gate valve according to any one of Items 1 to 7.   The soft seal gate valve according to claim 8 or 9, wherein the stopper portion is provided at a pressure contact portion on the taper side surface, and the pressure contact portion on the taper side surface protrudes from the stopper portion. The said stopper part is provided in the press-contact part of the said annular lower end surface and the said taper side surface, or separately, and the press-contact part of the said annular lower end surface and the said taper side surface protrudes from the said stopper part. Soft seal gate valve.   The soft seal gate valve according to claim 8 or 9, wherein both ends of the stopper portion provided in the water stop portion are extended to guide portions provided on both sides of the base material.

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