JP2014105709A - Soft seal gate valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft seal gate valve having a fixing structure of a sealing material capable of achieving secured sealing performance.SOLUTION: A valve element 15 of a soft seal gate valve is constituted by a metal valve body 21, a female screw member 22, and a valve lower member 23, and a rubber sealing material 24 having sufficient elasticity is attached to the whole of the valve element. In an upper half part of the sealing material, an upper sealing part 24c fastened between the valve element and the female screw member and coming in close contact with an upper valve seat from an interface between the valve element and the female screw member is protruded toward the outer side of the valve element, and in a lower half part of the sealing member, a lower sealing part 24e fastened between the valve element and the valve lower member and coming in close contact with a lower valve seat from an interface between the valve element and the valve lower member is protruded.

Description

  TECHNICAL FIELD The present invention relates to a soft seal gate valve, and more specifically, to a valve body in a soft seal gate valve that opens and closes a valve body by moving a valve body with a seal material in a predetermined position of the valve body in a direction crossing a pipeline. The present invention relates to a fixing structure for a sealing material.

  A valve body housing part having an opening communicating with the valve box is connected to the upper part of the valve box, and a movable valve body is provided to the valve body housing part and the valve box through the opening. When the body is accommodated in the valve body accommodating portion, the valve is opened, the valve body is lowered into the valve box, and the lower part of the sealing material provided in the valve body is brought into contact with the lower half of the inner peripheral surface of the valve box, There is known a gate valve that is closed when the upper portion of the sealing material is brought into contact with a valve seat provided at an opening edge of the opening.

  As a structure for fixing the sealing material to both surfaces of the valve body, a plurality of bolt insertion holes are formed at predetermined positions of the valve body and the sealing material, and sealing materials are respectively arranged on both surfaces of the valve body, and the bolts are inserted into the bolt insertion holes. The seal material is fixed to the valve body with a bolt head and a nut by inserting a nut and screwing a nut to the tip of the bolt (see, for example, Patent Document 1).

Japanese Patent No. 4515906

  However, in the sealing material fixing structure described in Patent Document 1, since the bolt for fixing the sealing material passes through the bolt insertion hole formed in the valve body, the fluid passes through the bolt insertion hole when the valve is closed. Could leak out downstream.

  Then, this invention aims at providing the soft seal gate valve provided with the fixing structure of the sealing material which can acquire reliable sealing performance.

  In order to achieve the above object, a soft seal gate valve according to the present invention has a valve body housing portion provided with an opening portion communicating with the valve box at the upper portion of the valve box, and the valve body through the opening portion. When a movable valve element is provided in the accommodating part and the valve box, and the valve element is accommodated in the valve element accommodating part by the turning operation of the valve rod screwed to the female screw member provided on the upper part of the valve element. The lower seal portion of the rubber seal material attached to the valve body is lowered to the lower half of the inner peripheral surface of the valve box. In the gate valve which is brought into contact with the seat and is brought into a fully closed state by bringing the upper seal portion of the seal material into contact with the upper valve seat formed on the opposing surface of the opening on the valve body accommodating portion side, The valve body includes a valve main body in which two disc-shaped valve body portions are joined by an intermediate connecting portion, and a female screw member mounted on the upper portion of the valve main body. A valve lower member attached to a lower portion of the valve body, and the seal member includes a pair of seal members provided on one side surface and the other side surface of the valve body. An upper seal portion located in the upper half portion and a lower seal portion located in the lower half portion of the valve body are integrally formed, and the upper seal portion includes an upper portion of the disc-shaped valve body portion, the female screw member, The lower seal portion is sandwiched between the lower portion of the disc-shaped valve body portion and the valve lower member, and the female screw member is attached to both sides of the female screw member. An upper connecting portion projecting in a direction orthogonal to the rod, and the valve lower member protrudes in a direction orthogonal to the valve rod on both sides of the valve lower member and faces the upper connecting portion. A connecting portion, between the valve body with the female screw member and the valve lower member. The valve main body, the female screw member, the valve lower member, and the seal material are integrated by connecting the upper connecting portion and the lower connecting portion with connecting means in a state where the seal material is sandwiched. It is characterized by that.

  According to the soft seal gate valve of the present invention, after the sealing material is mounted on the valve body using the elasticity of rubber, the female screw member is mounted on the upper part of the valve body from above, and the valve lower member is mounted from below. The valve body of the soft seal gate valve can be formed by connecting the upper connecting portion provided on the female screw member and the lower connecting portion provided on the valve lower member by connecting means attached to the lower portion of the valve body. Therefore, it is not necessary to provide a through hole such as a bolt insertion hole in the valve body, and the sealing performance when the valve is closed can be ensured.

It is a disassembled side view of the valve body which shows one form example of the soft seal gate valve of this invention. It is a front view of a valve body similarly. It is a side view of a valve body similarly. It is a top view of a valve body similarly. It is a bottom view of a valve body similarly. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is the perspective view which looked at the valve body from the upper part. It is the perspective view which looked at the valve body from the downward direction. It is a partial cross section front view of a valve body. It is XI-XI sectional drawing of FIG. It is a partial cross section front view of a sealing material. It is XIII-XIII sectional drawing of FIG. It is a partial cross section front view of a female screw member. It is XV-XV sectional drawing of FIG. It is a partial cross section front view of a valve lower member. It is XVII-XVII sectional drawing of FIG. It is a cross-sectional side view which shows the soft seal gate valve of a valve closing state. It is a cross-sectional front view which shows the soft seal gate valve of a valve opening state.

  FIG. 1 thru | or FIG. 19 shows the one example of the soft seal gate valve of this invention. First, as shown in FIG.18 and FIG.19, the soft seal gate valve 11 is a valve connected to piping before and behind. The valve body 12 is connected to the valve body 12, the valve body housing part 14 connected to the upper part of the valve box 12 through the opening 13, and the valve body housing part 14 and the valve box 12 through the opening 13. The valve body 15 is movable in the vertical direction perpendicular to the axis, and the operation section 16 is provided on the valve body housing section 14. When the handle connected to the operation unit 16 is operated and the valve element 15 is accommodated in the valve element accommodating part 14 by the valve rod 17, the valve element 15 is fully opened (FIG. 19), and the valve element 15 is lowered into the valve box 12. When the upper valve seat 13a formed on the opposed surface of the opening 13 on the valve body housing portion side is provided with the downward arcuate lower valve seat 12a provided in the lower half of the inner peripheral surface of the valve box. When the body 15 comes into contact, the fully closed state (FIG. 16) is obtained. In addition, the valve box 12 formed by casting can be greatly improved in durability of the valve box 12 by applying powder coating to the entire valve box 12 including the valve seat provided in the valve box.

  The valve body 15 includes a valve body 21, a female screw member 22 attached to the upper part of the valve body 21, and a valve lower member 23 attached to the lower part of the valve body 21. A rubber seal material 24 having sufficient elasticity and stretchability is attached to the entirety, and guide grooves 18 provided on both sides of the valve body 15 from the valve box 12 to the valve body accommodating portion 14 are provided. A guide member 25 slidably contacting is attached.

  The valve main body 21 has a shape in which two disc-like valve body portions 21a and 21a are joined by an intermediate connecting portion 21b, and the valve main body 21 has a shape for accommodating the valve rod 17 in the central vertical direction. A valve stem storage cylinder portion 21c is provided. An upper holding step portion 21d for holding the upper portion of the sealing material 24 is provided on the upper half outer peripheral inner surface portion of the disc-like valve body portion 21a, and the lower half outer peripheral inner surface portion of the disc-like valve body portion 21a is provided on the inner surface portion. A lower holding step portion 21e for holding the lower portion of the sealing material 24 is provided.

  The seal member 24 is composed of a pair of seal members 24a and 24a provided on one side surface and the other side surface of the valve body 15. The upper half of each seal member 24a is connected to the upper holding step portion 21d of the valve body 21. An upper fitting portion 24b to be fitted and an upper seal portion 24c protruding from the outer peripheral side of the upper fitting portion 24b toward the outer side of the valve body 21 are provided, and the lower half of each seal member 24a A lower fitting portion 24d fitted to the lower holding step portion 21e and a lower seal portion 24e protruding from the outer peripheral side of the lower fitting portion 24d toward the lower side of the valve body 21 are provided, and the upper fitting portion 24b is provided. A flat circular opening 24f is provided in the central portion of the seal member 24a between the lower fitting portion 24d and the lower fitting portion 24d. A plurality of engaging irregularities 24g that engage with the outer surface of the valve lower member 23 are provided on the inner surface of the lower fitting portion 24d.

  The female screw member 22 is provided with a female screw portion 22a into which the valve rod 17 is screwed at the center of the upper portion. A portion 22b is provided. On the outer periphery of the upper half of the female screw member 22, there is provided an arc-shaped holding convex portion 22c that covers the outer peripheral surface of the upper seal portion 24c protruding toward the side of the valve body 21, and the holding convex portion 22c On the inner peripheral side, there is provided an upper clamping portion 22d that is inserted inside the upper holding step portion 21d and sandwiches the upper fitting portion 24b of the seal member 24a with the upper holding step portion 21d. Yes. Further, a fitting concave portion 22e into which the valve lower member 23 is fitted is provided between both lower ends of the holding convex portion 22c, and a horizontal direction perpendicular to the valve rod is provided above the fitting concave portion 22e. The upper connecting portions 22f projecting from each other are provided.

  The valve lower member 23 is provided with a valve rod insertion portion 23a corresponding to the valve rod storage cylinder portion 21c of the valve body 21 at the lower center, and the valve lower member 23 including the outer surface of the valve rod insertion portion 23a. On the outer surface of the lower half part, a lower clamping part 23b is inserted inside the lower holding step part 21e of the valve body 21 and sandwiches the lower fitting part 24d of the seal member 24a with the lower holding step part 21e. Is provided. On the outer surface of the lower sandwiching portion 23b, there is provided an engaging uneven portion 23c that engages with the engaging uneven portion 24g of the seal member 24a. Further, on both sides of the valve lower member 23, a lower connection portion 23d facing the upper connection portion 22f of the female screw member 22 is projected in a horizontal direction perpendicular to the valve rod, and below the lower connection portion 23d. Is provided with a fitting convex portion 23e that fits into the fitting concave portion 22e of the female screw member 22.

  Assembling the valve body 21, the female screw member 22 and the valve lower member 23 and the sealing material 24 formed in such a shape, first, the upper part of the disc-like valve body 21 a is formed from the inner surface side of each sealing material 24. Inserted into the opening 24f, the upper half of both disc-shaped valve body portions 21a protrudes from the inside of the sealing material 24 to the outside through the opening 24f, and the upper fitting portion 24b is an intermediate connection of the valve body 21. A state is put on the part 21b. Next, the lower half part of the sealing material 24 is extended downward using the elasticity of rubber, and is positioned below the outer periphery of the lower part of the disc-like valve body part 21a. In a state of being positioned below the lower outer periphery of the disc-shaped valve body 21a, the valve lower member 23 is inserted between the lower portions of the both sealing materials 24, and the engaging uneven portions provided on the inner surfaces of the respective lower fitting portions 24d. 24g and the engagement uneven | corrugated | grooved part 23c provided in both surfaces of the valve lower member 23 are each unevenly engaged.

  After the valve lower member 23 is sandwiched between the lower fitting portions 24d from both sides in this way, the both sealing materials 24 are pulled up above the valve body 21, and the lower fitting portion 24d sandwiching the valve lower member 23 is formed. The elastic body is pushed into the lower holding step portion 21e of the valve body 21 and the upper fitting portion 24b is fitted into the upper holding step portion 21d so that the upper portion of the disc-like valve body portion 21a is placed on the upper outer periphery. The seal portion 24c is put along.

  Next, the female screw member 22 is inserted between the disc-like valve body parts 21a and 21a from above, and the upper fitting part 24b is sandwiched between the upper clamping part 22d and the upper holding step part 21d, and The holding convex portion 22c is brought into contact with the outer peripheral surface of the upper seal portion 24c, and the fitting concave portion 22e and the fitting convex portion 23e are fitted. Then, with the axes of the through holes 22g and 23f provided in the upper connecting portion 22f and the lower connecting portion 23d being aligned, the rivets 26 serving as connecting means are inserted into the through holes 22g and 23f, By crushing the end portion and connecting the female screw member 22 and the valve lower member 23, the valve main body 21, the female screw member 22, the valve lower member 23, and the seal member 24 can be integrated.

  Finally, the guide member 25 inserts the connecting piece 25a between the upper connecting portion 22f and the lower connecting portion 23d, and locks the bifurcated engagement claw 25b provided on the connecting piece 25a to the rivet 26. Thus, the valve body 15 to which the guide member 25 is attached can be completed.

  When the valve is closed, the sealing material 14 is such that the upper seal portion 24c protruding from the upper half of the valve body 15 toward the side is in close contact with the upper valve seat 13a of the valve box 12, and is downward from the lower half of the valve body 15. When the lower seal portion 24e protruding toward the bottom is in close contact with the lower valve seat 12a, the sealing performance of the soft seal gate valve can be ensured. By forming the valve body 15 in this way, there is no need to form a bolt insertion hole in the valve body 21 as in the prior art, so that the sealing property when fully closed can be ensured and a reliable sealing state is achieved. Can be obtained.

  DESCRIPTION OF SYMBOLS 11 ... Soft seal gate valve, 12 ... Valve box, 12a ... Lower valve seat, 13 ... Opening part, 13a ... Upper valve seat, 14 ... Valve body accommodating part, 15 ... Valve body, 16 ... Operation part, 17 ... Valve rod 18 ... Guide groove, 21 ... Valve body, 21a ... Disc valve body, 21b ... Intermediate coupling part, 21c ... Valve rod storage cylinder part, 21d ... Upper holding step, 21e ... Lower holding step, 22 ... Female Screw member, 22a ... Female thread part, 22b ... Valve rod insertion part, 22c ... Holding convex part, 22d ... Upper clamping part, 22e ... Fitting concave part, 22f ... Upper connecting part, 22g ... Through hole, 23 ... Valve bottom Member 23a ... Valve stem insertion part 23b ... Lower clamping part 23c ... Engagement uneven part 23d ... Lower connection part 23e ... Fitting convex part 23f ... Through hole 24 ... Sealing material 24a ... Seal Member, 24b ... Upper fitting part, 24c ... Upper seal part, 24d ... Lower fitting part, 24e ... Part seal portion, 24f ... opening, 24 g ... engaging uneven portion, 25 ... guide member, 25a ... connecting piece, 25b ... engaging claw, 26 ... Rivet

Claims (1)

  A valve body housing part having an opening communicating with the valve box is continuously provided on the upper part of the valve box, and a movable valve body is provided between the valve body housing part and the valve box through the opening, When the valve element is accommodated in the valve element accommodating part by the turning operation of the valve rod screwed to the female screw member provided on the upper part of the valve element, the valve element is fully opened, and the valve element is lowered into the valve box to The lower seal portion of the rubber seal material attached to the valve body is brought into contact with the downward arcuate lower valve seat provided in the lower half of the inner peripheral surface of the valve box, and the upper seal portion of the seal material is In a gate valve that is brought into a fully-closed state by contacting upper valve seats respectively formed on opposing surfaces of the opening on the valve body housing portion side, the valve body includes two disc-like valve body portions as intermediate connection portions. A valve body joined at the above, a female screw member attached to the upper part of the valve body, and a valve lower member attached to the lower part of the valve body, The seal member is composed of a pair of seal members provided on one side surface and the other side surface of the valve body, and each seal member includes an upper seal portion located in the upper half portion of the valve body and a lower half portion of the valve body. And a lower seal portion positioned integrally with each other, the upper seal portion is sandwiched between the upper portion of the disc-shaped valve body portion and the female screw member, and the lower seal portion is the disc-shaped valve. Each of the female screw members is provided with an upper connecting portion projecting in a direction perpendicular to the valve rod on both sides of the female screw member, and sandwiched between a lower part of the body part and the valve lower member, The valve lower member is provided with a lower connection portion projecting in a direction orthogonal to the valve stem on both sides of the valve lower member and facing the upper connection portion, and the valve member is provided with the female screw member and the valve lower member. The upper connecting part and the lower part in a state where the sealing material is sandwiched between the main body and the lower part. By connecting each of the sintered part by connecting means, said valve body, said female screw member, the soft seal gate valve, characterized in that integrated the valve bottom member and the sealing member.

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