JP2014129862A - Soft seal gate valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft seal gate valve that can improve exudation, can be used while restricting peeling of carbon or the like, a valve member and a rubber sheet are closely attached under a high accuracy to prevent peeling of the rubber sheet, realize its high sealing characteristic to prevent leakage of fluid and at the same time an excessive fastening of the valve member can be prevented while scar to the sliding portion of the valve member and a valve case is being prevented.SOLUTION: A valve seat 6 and a cutoff plane 7 arranged in a valve case 2 are sealed by a valve member 1 lifting or lowering in a crossing direction in respect to a flow passage 5 in the valve case 2 so as to open or close the flow passage 5 of the valve case 2. Rubber lining is applied to base material 10 so as to provide each of a valve member seal 31 and a cut-off plane 32 and at the same time a part of resin or hard rubber stopper restricting over-fastening of the valve member 1 while being abutted against the cutoff plane 7 is wound into the valve member 1 by the rubber lining and fixed there. The stopper is integrally or separately provided with a guide part and this guide part can be guided to a guide surface arranged at the valve case 2.

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 is widely used in piping of water supply facilities and the like, and has a structure in which water is sealed and prevented by a rubber seal material attached to a valve body. When the rubber seal material is attached to the valve body of the soft seal gate valve, the rubber seal material is integrated by the entire rubber lining or partial rubber lining.
For example, a soft seal valve in Patent Document 1 is disclosed as a soft seal gate valve in which a rubber seal material is attached to a valve body by full-surface rubber lining. In this soft seal valve, a rubber lining is applied to the entire surface of the valve body in the valve box.
On the other hand, as a soft seal gate valve in which a rubber seal material is attached to a valve body by partial rubber lining, for example, a soft seal valve of Patent Document 2 is disclosed. In this soft seal valve, a rubber valve body seat portion is lined on the base material of the valve body, and an elastic material is not lined on the portion surrounded by the valve body seat portion on the outer surface of the base material. Is provided.
Furthermore, the present applicant has proposed Japanese Patent Application No. 2011-151768 as such a soft seal gate valve. This soft seal gate valve has a rubber lining on the rubber adhering parts provided on the upper arc and lower end of the upstream and downstream sides of the base material of the valve body, and a partial lining by the valve body seal part and the water stop part. Is provided. In this soft seal gate valve, a stopper portion made of resin or hard rubber is provided on the water stop portion side, and this stopper portion is brought into pressure contact with the water stop surface of the valve box.

Japanese Patent No. 3423222 JP 2012-207718 A

The soft seal gate valve of the full-surface rubber lining as in Patent Document 1 has a problem in terms of leaching because the contact area between the rubber and tap water is large, and the carbon in the rubber seal material is peeled off and separated into tap water. There is also a problem that it becomes easy to mix, and the rubber seal material to be used increases, making it difficult to use an expensive rubber seal material.
The soft seal gate valve of the partial rubber lining of Patent Document 2 can reduce the amount of rubber used, but it is difficult to attach the rubber sheet in close contact with the valve body. It was necessary to fix the rubber and the base material by bonding.
In addition, the soft seal valve having a structure in which the valve body seal portion as in Patent Literature 1 and Patent Literature 2 is directly brought into contact with the valve box seat portion to stop water has an increase in operating force when the rubber valve seat is compressed. It becomes sluggish and it becomes difficult to understand the response when the valve body is closed. For this reason, especially in small-diameter valves, parts such as the valve box may be damaged due to excessive tightening of the valve body, or the screwed part between the valve stem and the female screw top may be seized and become inoperable. Parts are easily worn and damaged. As countermeasures, it is possible to increase the strength of the bolts for assembling or to provide a structure in which the bolts do not protrude, but in this case, the number of parts increases or the structure becomes complicated.

On the other hand, in the case of Japanese Patent Application No. 2011-151768, a rubber sheet can be tightly and highly accurately attached to the valve body to prevent fluid leakage and separation from the valve body, and by providing a stopper portion when the valve body cutoff is completed By making it easier to check the sense of, excessive tightening of the valve body can be prevented.
However, in this soft seal valve, since the stopper portion is integrated with the base material by partial rubber lining in a temporarily attached state where the stopper portion is fitted from the lower side of the base material, there is no gap between the stopper portion and the rubber. This may cause the rubber to be easily peeled off or the stopper part to come off.

  Further, in both cases of full lining and partial lining, guide portions are formed on both sides of the valve body, and the guide portions are mounted in the guide grooves at the corresponding positions on both sides of the valve box. . For this reason, when a valve body raises / lowers, a guide part slides with respect to a guide groove | channel, a mutual coating surface is scraped off, and it may reach the casting surface of a base material and may cause rust. When the valve body is not coated as a corrosion resistant material, the coating of the guide groove of the valve box is worn.

  The present invention has been developed in order to solve the above-described problems, and the object of the present invention is to improve the leaching property and at the same time suppress the peeling of carbon and the like, and increase the valve body and the rubber sheet. Attaching closely with precision to prevent the rubber sheet from peeling off and exhibiting high sealing performance to reliably prevent fluid leakage and excessive damage to the valve body and valve box sliding parts An object of the present invention is to provide a soft seal gate valve that can prevent excessive tightening.

  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 the soft seal gate valve that opens and closes the flow path of the valve box, a valve body seal portion that seals the valve seat base member with rubber lining and seals the valve seat portion and a water stop portion that presses and seals against the water stop surface are provided. A part of the flange or hole of the stopper part made of resin or hard rubber that contacts the water stop surface and restricts overtightening of the valve body is wound around the valve body with a rubber lining and fixed to this stopper part. This is a soft seal gate valve that is provided with a guide part integrally or separately and that can guide the guide part to a guide surface provided in a valve box.

  The invention according to claim 2 is the soft seal gate valve in which the guide portion protrudes from the valve body guide toward the guide surface, and the guide portion is brought into contact with the guide surface when the valve body is moved up and down.

  According to a third aspect of the present invention, a rubber fixing portion is provided in 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 at least one or both of the upper arc portion and the lower end portion are provided. This is a soft seal gate valve that forms a central through hole that penetrates the valve stem insertion hole of the base material, and rubber lining is provided through the central through hole to integrally form the valve body seal part and water stop part in the base material. is there.

  According to a fourth aspect of the present invention, a plurality of through portions are formed in the lower end portion of the base material and a through hole is formed in the stopper portion, and rubber vulcanization molding is performed through the through hole and the through portion. This is a soft seal valve in which a water stop portion and a stopper portion are integrally formed on a base material.

  The invention according to claim 5 is a software in which a burr portion is integrally provided with a rubber lining at a peripheral portion on a surface boundary side with a base material of a valve body seal portion and a water stop portion via a thinner cutout portion. It is a seal gate valve.

  According to the first aspect of the present invention, the minimum required partial lining is provided by the valve body seal portion and the water stop portion, thereby reducing the contact area of the rubber seal material to a fluid such as tap water. The quality of water such as odor and total organic carbon (TOC) is improved, the leaching property 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 part is provided on the valve body with rubber lining, the valve body and the rubber sheet are closely attached with high precision without using an adhesive to prevent detachment of the rubber sheet and achieve high sealing performance. Demonstrate and reliably prevent fluid leakage. Since the amount of rubber seal material used can be reduced by partial lining, it becomes easy to use high-performance rubber, and the life of the valve can be extended. A part of the flange or hole of the resin stopper is wrapped around and fixed to the valve body with a rubber lining, so that the gap between the stopper and the rubber seal is closed and the rubber seal is peeled off. Prevents the stopper from falling off. When the valve is shut off, the stopper comes into contact with the valve seat after the valve body seal is pressed against the valve seat. Tightening is prevented to prevent valve breakage. The valve body guide is protected by the guide part that is integrated with the stopper part or separately, and the valve body can be moved up and down while preventing damage to the valve body and the valve box, and part of the stopper part is caught by rubber lining. Thus, the stopper portion is prevented from being displaced or detached from the valve body, and even when the valve body is repeatedly opened and closed, the guide portion and the guide surface can be prevented from being damaged to ensure the sealing performance. When the stopper portion and the guide portion are integrally provided, it is easy to set the valve body and the rubber seal material in the rubber lining, and the rubber seal material can be integrated so as to be wound, so that it is difficult to drop off. In the case where the stopper portion and the guide portion are provided separately, the shape is simplified, so that molding becomes easy.

  According to the second aspect of the present invention, the guide member is protruded closer to the guide surface than the valve element guide, so that the valve element is raised and lowered while the guide part is brought into contact with the guide surface due to a step formed therebetween. It can move and prevents the paint from peeling or scratching due to sliding between the valve body and valve box when the valve is opened or closed.

  According to the invention of claim 3, since the valve body seal portion is integrally formed with the base material by applying the rubber lining through the central through hole, the rubber lining is positioned on the valve body without using an adhesive. To prevent the rubber lining from slipping or coming off from the valve body and maintaining high sealing performance. For this reason, a stopper part and a valve body guide can be hold | maintained in the predetermined position of a valve body closely by rubber lining. In particular, when the central through hole is formed in both the upper arc part and the lower end part, and the valve body seal part is integrally formed with the base material by rubber lining, the rubber lining is fixed to the base material at the upper and lower parts. Therefore, these can be integrated more firmly.

  According to the invention which concerns on Claim 4, since the rubber vulcanization molding is performed through the penetration part and the penetration hole, and the water stop part and the stopper part are integrally formed in the base material, the lower end portion of the valve body is formed. The stopper part can be firmly integrated with the water stop part. This reliably prevents the stopper portion from coming off and protects the valve body seal portion and the valve seat portion. When fluid pressure is applied to the water stop, the fluid pressure is received through a vulcanized rubber seal material, so that the sealing performance is improved while preventing the water stop from being displaced or removed due to the fluid pressure.

  According to the invention of claim 5, without breaking the coating of the base material through the cut-out portion, the rubber that has been rubbed off after vulcanization by using a hand or a tool after rubber vulcanization is efficiently removed. It can be removed to increase the lining accuracy. For this reason, generation | occurrence | production of the clearance gap between a base material and a rubber sealing material is prevented, and the shift | offset | difference and peeling of a rubber sealing material are avoided.

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. (A) is the center longitudinal expansion expanded sectional view of the valve body of FIG. (B) is the longitudinal expanded sectional view of (a). (A) is an enlarged front view of the base material of FIG. (B) is an enlarged bottom view of (a). (A) is a side view of the valve body of FIG. (B) is a perspective view of the valve body of FIG. It is a bottom view of a valve body. (A) is a perspective view of a stopper part and a guide part. (B) is a rear perspective view of (a). It is the perspective view which showed the other example of the guide part. (A) is sectional drawing which shows a rubber mold. (B) is the A section expanded sectional view of (a). It is the partially expanded sectional view which showed valve body upper part vicinity. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the soft seal gate valve of this invention. (A) is the center longitudinal expansion expanded sectional view of the valve body of FIG. (B) is the longitudinal expanded sectional view of (a). (A) is a front view of the base material of FIG. (B) is a bottom view of (a). It is a longitudinal cross-sectional view which shows the valve body in 3rd Embodiment of the soft seal gate valve of this invention. It is a partially notched front view of the valve body in 4th Embodiment of the soft seal gate valve of this invention.

  Embodiments of a soft seal gate valve according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first 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 valve body attached to the soft seal gate valve. Yes.

  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 shown in FIGS. 3 and 4 has a base material 10, and this base material 10 is cast-molded by a material such as spheroidal graphite cast iron (for example, FCD450-10) or stainless steel (SCS). The The base material (for example, spheroidal graphite cast iron) 10 is provided with a surface treatment portion 11, which is a surface treatment that can withstand a rubber vulcanization temperature of 180 ° C., for example, a resin such as an epoxy / polyamide resin It is provided by fluid dipping, electrostatic powder coating, or wrinkle processing. Of these, an appropriate surface treatment portion 11 may be applied to the base material, but it is particularly desirable to process the 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 becomes uniform and easier to stabilize, and surface cracking occurs than in the case of glazing by baking glass. It becomes difficult to handle during transportation. As a result, when the rubber lining is applied, scratches on the surface treatment portion 11 exposed to the flow path 5 are suppressed as much as possible, and the adhesion accuracy of the rubber material is increased with respect to the uniform film thickness of the surface treatment portion 11. It becomes possible to perform sulfur molding.

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

  The base material 10 has a valve rod insertion hole 12, an upstream side surface 13 and a downstream side surface 14 located on both sides of the valve rod insertion hole 12, and is provided in a wedge shape that is symmetrical with respect to the flow path 5. 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. Rubber fixing portions 16 are 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 fixing 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. Valve body guides 19 and 19 are formed on both sides of the base material 10.

  3 and 4, 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 rubber fixing portion 16 smaller than the groove width. The through holes 18 are provided symmetrically about the central through hole 17 so as to penetrate the upstream side surface 13 and the downstream side surface 14 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 engaged with the engaging surface 17a and fixedly fixed to the central through hole 17 while being engaged. The through holes 18 are also provided symmetrically at the lower end portion so as to penetrate the upstream side surface 13 and the downstream side surface 14 respectively.

  The valve body guide 19 is formed to protrude from both sides of the valve body 1 and is mounted in a loosely fitted state on guide surfaces 20 that are guide portions formed in a protruding shape on both sides inside the valve box 2. When the valve body 1 is mounted in the valve box 2, the valve body guide 19 is guided by the guide surface 20 of the valve box 2 so that the valve body 1 can be moved up and down in the valve box 2. Although not shown, the surface of the valve body guide 19 that faces the guide surface 20 is an inclined surface that is slightly inclined from the upper side to the lower side with respect to the direction in which the valve rod 4 moves up and down. It is desirable to provide the same inclination as the inclination of the valve body 1 due to the fluid pressure.

  The valve body 1 is provided by vulcanizing and molding a rubber material on the rubber fixing portion 16 of the base material 10 described above. As a result, a valve body seal portion 31 that seals against the valve seat portion 6 and a water stop portion 32 that presses and seals against the water stop surface 7 are provided. The valve body seal part 31 and the water stop part 32 are molded simultaneously.

  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. Specifically, rubber vulcanization molding is performed on the rubber fixing portion 16, the central through hole 17, and the step surface 15, so that the bulging valve body seal portion 31 and the step surface 15 are formed on the rubber fixing portion 16. And the annular holding portion 33 are provided integrally with the base material 10 through 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, the rubber lining is applied to the through holes 18 on the upper arc portion side and the lower end portion, so that the valve body seal portions 31 and 31 on the upstream side surface 13 and the downstream side surface 14 are connected to these through holes. 18 is integrated. In this way, the valve body seal portion 31 at the upper arc portion is integrally formed through the arc-shaped groove portion 16, the central through hole 17, the stepped portion surface 15, and the through hole 18, and the water stop portion 32 at the lower end portion is formed. These are integrally formed on the front and back sides through the through holes 18.

  As shown in FIGS. 5 and 6, two ridges 35, 35 are formed so as to protrude from the sealing portion with the water blocking surface 7. When the valve body 1 is closed, the protrusions 35 and 35 come into contact with and seal against the water stop surface 7. A stopper portion 36 is disposed between the protrusions 35 and 35.

  The vulcanized rubber material provided in the valve body seal portion 31 and the water stop portion 32 is integrally connected, and when the rubber vulcanization molding is performed, the valve body seal portion 31 and the water stop portion 32 are once as described above. To be molded. 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 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. 7A and 7B is made of, for example, a resin, a hard rubber, or a resin coating, and is formed of a nylon resin having a low frictional resistance in this embodiment. . It is preferable that the material has higher hardness than the rubber material forming the water stop portion 32. The stopper part 36 is provided symmetrically in the pressure contact part of the water stop part 32. At that time, the pressure contact portion protrudes from the stopper portion 36. The stopper portion 36 can abut against the water stop surface 7, and over-tightening of the valve body 1 is regulated by the abutment.

  The stopper portion 36 includes a contact surface 37 that faces the water stop surface 7, holding portions 38 and 38 that extend vertically from both sides of the contact surface 37, and a reinforcing portion 39 that connects the holding portions 38 and 38 to each other. And has a substantially U-shaped cross section. The contact surface 37 can contact the water stop surface 7 when the pressure contact portion of the valve body 1 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 entire stopper portion 36 can be positioned. Further, a flange portion 36 a is formed on the upper end side of the holding portion 38 and the reinforcing portion 39.

  A guide portion 40 is integrally provided above the stopper portion 36, and the guide portion 40 is disposed at a position facing the guide surface 20 when the stopper portion 36 is attached to the base material 10. The guide portion 40 is provided so as to protrude from the valve body guide 19 toward the guide surface 20. When the valve body 1 moves up and down, the guide portion 40 can be guided while abutting against the guide surface 20. ing.

  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 39 is fitted in the mounting concave groove 10a. Thereby, the guide part 40 will be in the state with which the concave part 19a formed in the lower part of the valve body guide 19 was mounted | worn. Since the guide portion 40 is formed integrally with the stopper portion 36, it is difficult to drop off during temporary attachment. In this state, the base material is fixed by applying a partial rubber lining by vulcanization so as to wind a part of the flange portion 36a of the stopper portion 36 from above the base material 10, the stopper portion 36, and the guide portion 40. 10, rubber is entangled so as to wrap around the stopper portion 36 and the guide portion 40, and it is difficult to come off the base material 10. As a result, the stopper portion 36 and the guide portion 40 are integrated while being prevented from coming off from the base material 10.

  The stopper portion 36 and the guide portion 40 described above are not necessarily provided integrally as in the present embodiment, and may be separate. The stopper portion 36 can be disposed at any position of the water stop portion 32 as long as it can contact the water stop surface 7 when the valve body 1 is closed. Further, the stopper portion 36 and the guide portion 40 can be provided in a type in which a rubber seal material is attached by full-surface rubber lining or fitting. Also in this case, as in the case of the partial rubber lining, each function can be exhibited in the stopper portion and the guide portion.

  When the valve body 1 is attached to the valve box 2, the valve body 1 is attached so as to be movable up and down via a valve rod 4 and a female screw top 41 as shown in FIGS. 1 and 2. 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. Therefore, the valve stem 4 rotates in a state where vertical movement is prevented with respect to the valve box 2. A buffer member 45 such as a thrust washer is interposed between the annular flange 43 and the lid 3, and this buffer member 45 prevents the annular flange 43 and the lid 3 from coming into direct contact.

  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 valve disc guide 19 is restricted by the guide surface 20, so that the valve disc 1 is moved to the valve stem by the screwing of the screw portion 42 and the female screw portion 47. 4 moves 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 may 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 in a fixed position when the valve body 1 is opened and closed. It is a screw type gate valve. Although not shown, the soft seal gate valve may have an external screw type gate valve structure. In the externally threaded gate valve, the threaded portion of the valve stem is outside the valve box, and the valve stem is raised by opening the valve and lowered by closing.

  In addition, as shown in FIG. 2, the 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.

  Further, although not shown, the valve body guide may be provided in a convex shape, the guide surface may be provided in a concave shape, and the valve body guide may be provided slidably on the guide surface by loose fitting of these irregularities. As described above, if the valve body guide is slid in the vertical direction with the valve body 1 stopped by the rotation of the valve stem 4, the structure for attaching the valve body guide to the valve box is limited. There is no. Also in this case, the shape of the stopper portion and the guide portion can be changed and temporarily attached to the valve body in the same manner as described above, and these can be integrated by rubber lining.

  For example, FIG. 8 shows another example of the guide portion. In this example, the guide portion 50 is formed in a substantially U-shaped cross section, and a plate-like winding portion 51 is extended from the guide portion 50. Also in this case, as described above, a part of the winding part 51 or the guide part 50 is wound and fixed on the valve body 1 with a rubber lining, and the guide part 50 and the winding part 51 are removed from the base material 10. I can stop.

  FIG. 9 shows a rubber mold 60 for applying a rubber lining to the base material 10. A painted base material 10 is set in the rubber mold 60 together with the stopper portion 36 and the guide portion 40, and a partial lining process is performed. As shown in FIG. 9 (b), in the rubber mold 60, gaps 61 are respectively provided at the periphery of the casting mold for forming the valve body seal portion 31 and the water stop portion 32. A cut-off groove 62 is provided. Due to these gaps 61 and cut-off grooves 62, the cut-off portions 65 having a thinner thickness due to the gaps 61 are formed at the peripheral edge of the valve body seal portion 31 and the water stop portion 32 on the surface boundary side during rubber lining. The burr portion 66 is provided integrally with the lining portion by the cut-off groove 62 through the cut-out portion 65. The depth D of the gap 61 and the length L to the biting groove 62 are each set to about 0.2 mm, for example. As the gap 61 is narrower and substantially knife-shaped, it becomes easier to remove the burr 66 that protrudes into the biting groove 62. On the other hand, the biting groove 62 is formed in, for example, a hemispherical concave shape of about R1.5 mm. Although the valve body seal part 31 side is shown in the enlarged view of FIG. 9A, the water stop part 32 side has the same structure.

  Thus, by providing the burr portion 66 in the cut-off groove 62 through the gap 61, the coating can be prevented from being broken due to variations in the base material 10. After the rubber vulcanization, the burr 66 is easily separated by the cut-off portion 65, and the burr 66, which is an excess rubber that protrudes, can be efficiently removed. The cut-off groove 62 can be provided in an arbitrary cross-sectional shape such as a V-shaped concave shape or a trapezoidal concave shape in addition to the hemispherical concave shape.

In FIG. 10, when the rubber thickness t1 inside the central through hole 17 on the upper side of the valve body 1 is thin, the rubber lining of the base material 10 may be peeled off simultaneously when the burr 66 is removed. Therefore, it is desirable to form the stepped surface 15 so as to increase the rubber thickness t1 to the valve stem insertion hole 12 in the annular holding portion 33 as much as possible. In this case, the base material 10 and the rubber lining can be firmly fixed. In addition, since the difference in thickness between the rubber lining and the burr 66 is increased, the burr 66 can be easily removed while the rubber lining is hardly detached. The through hole 18 on the lower side of the valve body 1 can also be provided so as to be connected to the valve stem insertion hole 12, and in this case, the same performance as described above can be exhibited.
Further, the rubber on the stepped portion surface 15 is in a position where it does not interfere with the valve stem 4 even when the rubber expands inward when the valve is fully closed.

  In the soft seal gate valve of the present invention, a rubber lining is applied to the rubber fixing 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 is connected to the rubber fixing portion 16 by this rubber lining. Since each of the water stop portions 32 is provided, the rubber material that comes into contact with a fluid such as tap water is reduced to about 1/4 of the rubber surface area as compared with, for example, the entire rubber lining, The exposed rubber surface can be minimized. As a result, the leachability is improved, and at the same time, exfoliation of carbon or the like due to deterioration of the rubber material of the valve body seal portion 31 and the water stop portion 32 is minimized. As a result, it is possible to use an expensive rubber material having high performance.

  A part of the stopper portion 36 is wound and fixed on the valve body 1 with a rubber lining, and a guide portion 40 is provided integrally or separately on the stopper portion 36, and the guide portion 40 is provided on the guide surface 20 provided on the valve box 2. Since the guiding is possible, it is possible to prevent the base material 10 and the rubber lining from being peeled off, and the stopper portion 36 and the guide portion 40 to be removed, and these can be firmly integrated with the base material 10 by rubber vulcanization adhesion.

  At this time, the valve body 1 can be moved up and down while sliding the guide portion 40 with respect to the guide surface 20, and the friction resistance can be reduced by the guide portion 40, so that the coating of the valve body 1 and the valve box 2 is worn or damaged. It can prevent sticking or peeling. In addition, since the step is provided so that the guide portion 40 protrudes from the valve body guide 19 toward the guide surface 20, the guide portion 40 reliably contacts the guide surface 20 and the surface of the valve body guide 19 and the guide. Contact with the surface 20 can be avoided. Furthermore, the torque at the time of the intermediate opening is also reduced, and the torque difference when the guide portion 40 hits the guide surface 20 becomes clearer and the opening / closing operation becomes easier.

  Since the stopper portion 36 is provided at the pressure contact portion of the water stop portion 32 and the pressure contact portion protrudes from the stopper portion 36, when the valve is closed, the pressure contact portion of the valve body 1 first comes into contact with the water stop surface 7, Subsequently, when the valve body 1 is tightened, the pressure contact portion is compressed by the elasticity of the rubber material to stop water, and the stopper portion 36 abuts against the water stop surface 7. 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. For this reason, although the contact area of the pressure contact portion is reduced by forming the partial lining structure and the protruding portion 35, excessive deformation of the pressure contact portion of the rubber lining can be prevented and the burden on the water stop portion 32 is reduced. Thus, the water stop portion 32 can be prevented 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.

  Compared to the case where the rubber material, which is an elastic material, is gently deformed by the stopper portion 36 that is harder than the rubber material forming the water stop portion 32 coming into contact with the metal water stop surface 7 when the valve body 1 is closed. The deadline torque increases rapidly. For this reason, the feeling at the time of closing is easily transmitted, the completion state of the closing of the valve body 1 can be surely grasped, and further tightening can be prevented and damage to the valve can be avoided. Since the stopper portion 36 is made of resin, the painted surface of the valve box 2 is not damaged.

  A central through hole 17 is formed in the upper arc portion, and a rubber vulcanization molding is performed on the stepped surface 15 of the valve rod insertion hole 12 through the central through hole 17 to form the valve body seal portion 31 and the water stop portion 32. Since they are integrally formed with the base material 10, they can be integrated in a retaining state. In this case, a rubber fixing portion 16 can be provided near the center of the valve body 1 (near the insertion of the valve stem 4) to allow the rubber sheet to penetrate from the upstream side and the downstream side. Therefore, the fixing strength of the rubber is increased, and even when the valve body 1 is moved up and down, the rubber lining can be prevented from being displaced or detached to maintain high sealing performance, and excellent operability can be secured.

  In comparison with this, when the rubber sheets on both sides of the valve body are connected by the rubber filled in the through holes without providing the central through hole 17, the portion for fixing the rubber sheet to the base material of the valve body is , It must be provided avoiding the vicinity of the central part of the valve body where the valve stem is inserted. Therefore, in this case, when the valve body is moved up and down, or due to a pressure difference between the primary side and the secondary side of the soft seal gate valve, there arises a problem that the rubber sheet is easily displaced from the base material of the valve body. .

  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, and the gap between the valve body 1 and the valve body seal portion 31 and the water stop portion 32 is prevented, and a fixing member for fitting and mounting is provided. Higher sealing performance is exhibited than in the case where a partial rubber sheet is used, the adhesive is not eluted into the fluid, and 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.

  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. For this reason, even when the valve body 1 moves up and down and is seated on the valve seat part 6 or separated from the valve seat part 6, there is no possibility that the rubber material is displaced or detached. 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 water stop portion 32 is not rubbed against the valve box 2. As a result, the wear of the valve body seal portion 31 and the water stop portion 32 is minimized, 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 two protrusions 35 and 35 are formed to project at the seal portion, the protrusion 35 is pressed against the water stop surface 7 in a line contact state when the valve is closed, and is tightened with a pressure contact due to this small contact area. The surface pressure is increased to improve adhesion, and high sealing performance can be exhibited. In this case, the number of protrusions may be one. When the number of the protruding portions 35 is two, it is possible to increase the pressure contact force to the water stop surface 7 and reliably prevent leakage. At that time, the above-described stopper portion 36 prevents the protruding portion 35 from being broken at the time of a strong pressing force.

Moreover, since the rubber fixing 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, the surface when the valve is closed 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.

In FIG. 11, 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.
As shown in FIGS. 12 and 13, in the soft seal valve in this embodiment, in addition to the upper arc part side of the rubber fixing part 16 of the base material 10, a central through hole 17 is formed also in the lower end part. The central through hole 17 is also formed so as to penetrate the valve stem insertion hole 12 of the base material 10 in the same manner as the upper arc portion side. Thus, the central through hole 17 may also be provided in the lower end portion. Furthermore, in addition to providing both in the upper arc part and the lower end part, it may be provided in at least one of these.

As a result, on the lower end portion side of the base material 10, by applying a rubber lining through the central through hole 17, the water stop portion 32 and the annular holding portion 33 are provided on the stepped surface 15. It is integrated with the base material 10 through the through hole 17.
Although not shown, it is desirable to make the rubber thickness inside the central through hole 17 thicker on the lower end portion side as well as the upper arc portion side.

  In the case of this embodiment, central through holes 17 and 17 are formed in both the upper arc portion and the lower end portion, and the step formed in the upper and lower portions of the valve stem insertion hole 12 through these central through holes 17. Since the valve body seal part 31 and the water stop part 32 are formed integrally with the base material 10 by rubber vulcanization molding of the part surfaces 15 and 15, the valve body seal part 31 and the water stop surface 32 vicinity are removed. It can be integrated in the stopped state, and in particular, the lining strength on the upper side and the lower side of the entire base material 10 is increased. For this reason, even when a large force is applied intensively in the vicinity of the valve body seal portion 31 or the water stop portion 32 when the valve body 1 is moved up and down, the rubber lining is prevented from being displaced or detached to achieve high sealing performance. It can be maintained and the operability is not impaired.

  Moreover, on the lower end portion side of the valve body 1, rubber vulcanization is formed through the central through hole 17 so that the water stop portion 32 is integrally formed with the base material 10, so that the lower end portion is made of rubber material. The water stop portion 32 can be strongly integrated through the central through hole 17 so as to be wound.

In FIG. 14, the valve body in 3rd Embodiment of the soft seal gate valve of this invention is shown.
In the soft seal valve in this embodiment, on the lower end portion side of the valve body 1, in addition to the central through hole 17, through holes 18 are formed on both sides adjacent to the central through hole 17. The number and shape of these through holes 18 can be arbitrarily set similarly to the above-described through holes 18 on the upper side, and it is desirable to provide them symmetrically with respect to the base material 10.

  When the through hole 18 is provided close to the central through hole 17, the water retaining portion 32 is made stronger by the base material 10 because the lower annular holding portion 33 is integrated with the rubber lining in the through hole 18. Integrated into This prevents the rubber seal material from peeling off the water stop portion 32 to which a strong force is applied when the valve body 1 is cut off, and prevents the stopper portion 36 and the guide portion 40 from falling off due to this peeling.

  In FIG. 15, the valve body of 4th Embodiment of the soft seal gate valve of this invention is shown. In the valve body 1 of the soft seal valve in this embodiment, a through hole 80 is formed in the stopper portion, and rubber vulcanized at the lower end portion of the base material 10 through the through hole 80 and the through hole 18 of the base material 10. The water stop part 32 and the stopper part 36 (guide part 40) are integrally fixed by performing shaping | molding. In this case, by filling the through hole 80 with the rubber lining, the stopper part 36 and the guide part 40 can be integrated with the base material 10 through the through hole 80 to prevent them from falling off or shifting. In this manner, a part of the hole (through hole 80) of the stopper can be fixed by being wound around the valve body with the rubber lining.

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 16 Rubber fixing part 17 Central through-hole 20 Guide surface 31 Valve body seal part 32 Water stop part 36 Stopper part 40 Guide part 65 Chamfer part 66 Burr part 80 Through hole

Claims (5)

  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 base material is provided with a rubber lining to seal the valve seat portion and a valve body seal portion that seals against the water stop surface and a water stop portion that presses and seals against the water stop surface. A part of a stopper made of resin or hard rubber that restricts overtightening of the body is wrapped around the valve body with a rubber lining and fixed, and a guide part is provided integrally or separately in this stopper part. A soft seal gate valve which can be guided to a guide surface provided in the valve box.   2. The soft seal gate valve according to claim 1, wherein the guide portion projects from the guide surface side, and the guide portion is brought into contact with the guide surface when the valve body is moved up and down.   A rubber fixing portion is provided at 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 rod of the base material is inserted into at least one or both of the upper arc portion and the lower end portion. 3. The software according to claim 1, wherein a central through hole penetrating the hole is formed, rubber lining is provided through the central through hole, and the valve body seal portion and the water stop portion are integrally formed in the base material. Seal gate valve.   A plurality of through portions are formed in a lower end portion of the base material and a through hole is formed in the stopper portion, and rubber vulcanization molding is performed through the through hole and the through portion, and the water stopping portion and the water stop portion are formed. The soft seal valve according to any one of claims 1 to 3, wherein a stopper portion is integrally formed with the base material.   5. The burr portion is integrally provided with a rubber lining at a peripheral portion of the valve body seal portion and the water stop portion on the surface boundary side with the base material through a thinner cut-out portion. The soft seal gate valve according to claim 1.

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