JP5999948B2 - Soft seal gate valve - Google Patents

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.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a soft seal gate valve having a sealing material fixing structure capable of improving corrosion resistance and ensuring 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. A movable valve body is provided in the housing part and the valve box, and the valve body is opened when the valve body is housed in the valve body housing part, and the valve body is lowered into the valve box and provided on both side surfaces of the valve body. In a gate valve that is closed when a ring-shaped sealing material is brought into contact with a ring-shaped valve seat provided in the valve box, the valve box including the valve seat is coated with powder, and the valve A rubber seal material is mounted on a ring-shaped seal material mounting portion formed at a position facing the valve seat in a closed state on the side surface of the main body, and is fixed to a holding member fixing groove formed on the side surface of the valve main body. The sealing material holding member holds the inner periphery of the sealing material on the side surface of the valve body, and the sealing material The peripheral portion from the side of the valve body is characterized in that protrudes toward the valve seat.

  Furthermore, the soft seal gate valve of the present invention includes a ring-shaped seal piece projecting from the side surface of the valve body toward the valve seat in a state where the seal material is mounted on the seal material mounting portion, and the ring A ring-shaped mounting piece projecting in a direction along the bottom surface of the seal material mounting portion from the inner periphery of the base portion of the seal-shaped seal piece, and the seal material mounting portion has an outer peripheral surface of the ring-shaped seal piece. A peripheral wall portion that abuts, a bottom surface portion on which a back surface of the ring-shaped mounting piece abuts, and a holding member fixing groove provided on an inner peripheral side of the bottom surface portion, wherein the sealing material holding member is the sealing material A seal material holding piece that abuts on the surface of the ring-shaped mounting piece and sandwiches the ring-shaped mounting piece between the bottom surface portion, and is bent from the inner peripheral side of the sealing material holding piece toward the valve body. Inserted into the holding member fixing groove on the outer peripheral side of the tip The holding member fixing groove includes an inclined surface portion inclined in a direction in which a groove side surface on the valve body inner side becomes deeper toward the valve body inner side, and a valve body facing the inclined surface portion. An engaging surface portion formed of a groove side surface on the outer side, and when the engaging protrusion provided at the tip of the engaging piece of the sealing material holding member is pressed against the inclined surface portion, along the inclination of the inclined surface portion When the engagement protrusion is deformed, the engagement protrusion is brought into contact with the engagement surface portion to be in an engaged state.

  According to the soft seal gate valve of the present invention, the sealing material is held on the side surface of the valve body by the sealing material holding member fixed to the holding member fixing groove formed on the side surface of the valve body. It is not necessary to provide such a through hole, and the sealing performance when the valve is closed can be ensured. Furthermore, since the sealing material is formed in a ring shape, the amount of the sealing material, particularly rubber, can be reduced. Further, since the valve seat is powder coated, the corrosion resistance is greatly improved and the occurrence of rust can be prevented.

It is a disassembled perspective view of the valve body which shows one example of the soft seal gate valve of this invention. It is a partial cross section front view of a valve body similarly. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is IV-IV sectional drawing of FIG. It is an expanded sectional view of the principal part. It is a cross-sectional front view which shows the soft seal gate valve made into the valve closing state. It is a cross-sectional side view which shows the soft seal gate valve made into the valve opening state.

  First, as shown in FIGS. 6 and 7, the soft seal gate valve 11 shown in this embodiment is connected to the valve box 12 connected to the front and rear pipes and the upper part of the valve box 12 via the opening 13. A valve body 15 that can be moved in the vertical direction perpendicular to the axis of the valve box 12 to the valve body housing part 14 and the valve box 12 through the opening 13; And an operating portion 16 provided on the upper portion of the valve body accommodating portion 14. When the valve element 15 is accommodated in the valve element accommodating part 14 by the valve rod 17 by operating a handle or the like connected to the operation part 16, the valve element 15 is opened into the valve box 12, and the valve is lowered. When the lower end of the body 15 is inserted into the valve body insertion groove 12 a provided in the lower half of the valve box 12, the ring-shaped valve seat 18 provided in the valve box 12 is connected to the ring-shaped valve seat 15 provided in the valve body 15. The sealing material 19 comes into contact with the valve to be closed.

  The valve seat 18 is cut in such a manner that the inner end of the tubular body portion 12b having the same diameter as the front and rear pipes is slightly inclined so that the valve body housing portion 14 side is expanded with respect to the direction orthogonal to the axis. It is formed in a substantially circular shape that is circular when viewed from the axial direction of the valve seat 18 and slightly elliptical when viewed from the direction orthogonal to the cut surface of the valve box 12. Further, the entire valve box 12 including the valve seat 18 is subjected to powder coating having excellent corrosion resistance.

  As shown in FIGS. 1 to 5, the valve body 15 includes a disk-shaped valve body 21 made of a hard material such as a metal or a hard synthetic resin, whose both side surfaces are inclined according to the inclination angle of the valve seat 18, and A top accommodating portion 22 provided on the upper portion of the valve main body 21, guide member mounting pieces 23 provided on both side portions of the valve main body 21, and a valve stem accommodating cylindrical portion 24 provided in the center vertical direction of the valve main body 21. And ring-shaped sealing material mounting portions 25 formed on both the upstream and downstream side surfaces of the valve main body 21, respectively. A female screw member (top) 26 that is screwed into a male screw of the valve stem 17 is fitted into the top housing portion 22, and the guide member mounting piece 23 is provided from the valve box 12 to the valve body housing portion 14. A guide member 28 to be inserted into the guide groove 27 is attached, and a shaft seal material 29 is attached to the upper through hole of the frame storage portion 22.

  The seal material 19 mounted on the seal material mounting portion 25 is a ring-shaped molded product made of a rubber-based material having flexibility and water-tightness, and the valve main body is mounted on the seal material mounting portion 25. A ring-shaped seal piece 19a projecting from the surface (side surface) 21 toward the valve seat 18, and a ring projecting in the direction along the bottom surface of the seal material mounting portion 25 from the inner periphery of the base of the ring-shaped seal piece 19a It is formed in a L-shaped cross section by the shape mounting piece 19b.

  The sealing material mounting portion 25 includes a peripheral wall portion 25a with which the outer peripheral surface of the ring-shaped seal piece 19a abuts, and a bottom surface portion 25b with which the back surface of the ring-shaped mounting piece 19b abuts, and the bottom surface portion 25b. A step portion 25c located on the inner side of the valve body is provided on the inner peripheral side. A holding member fixing groove whose groove section formed toward the outer peripheral side of the valve body has an acute triangle shape at a portion where the peripheral surface of the step portion between the bottom surface portion 25b and the step portion 25c contacts the outer peripheral portion of the step portion 25c. 30 is provided in a ring shape. The holding member fixing groove 30 is for fixing a sealing material holding member 31 for holding the sealing material 19 to the sealing material mounting portion 25 to the valve main body 21 and opens toward the valve main body outside. The groove side surface on the valve body inner side is an inclined surface portion 30a inclined in a direction deepening from the opening portion toward the valve body inner side, and the groove side surface on the valve body outer side facing the inclined surface portion 30a is: An engaging surface portion 30b for engaging the sealing material holding member 31 is formed.

  The sealing material holding member 31 is bent toward the valve body 21 from the inner peripheral side of the sealing material holding piece 31a and the sealing material holding piece 31a contacting the surface of the ring-shaped mounting piece 19b of the sealing material 19. And an engaging piece 31b fixed to the holding member fixing groove 30. On the outer peripheral side of the distal end of the engaging piece 31b, a thin engaging protruding piece that comes into contact with the engaging surface portion 30b and is engaged by being deformed toward the outer peripheral side along the inclined surface portion 30a. 31c is provided.

  The sealing material 19 is attached to the valve body 21 by fitting the sealing material 19 on the inner peripheral side of the peripheral wall portion 25 a of the sealing material mounting portion 25, and the sealing material holding piece 31 a of the sealing material holding member 31 in the ring shape of the sealing material 19. After the engaging piece 31b is inserted on the inner peripheral side of the bottom surface portion 25b toward the holding member fixing groove 30 so as to overlap with the mounting piece 19b, the sealing material holding member 31 is pushed toward the valve main body 21 and engaged. This is done by deforming the engagement protrusion 31c at the tip of the piece 31b to the outer peripheral side along the inclination of the inclined surface portion 30a.

  In this way, the engaging protrusion 31c is pressed against the inclined surface portion 30a to be deformed, whereby the engaging protrusion 31c enters the holding member fixing groove 30, and the outer surface of the engaging protrusion 31c is the engagement surface portion 30b. The seal material holding member 31 is fixed to the valve main body 21 in contact with the inner surface, and the seal material is interposed between the seal material holding piece 31 a of the seal material holding member 31 and the bottom surface portion 25 b of the seal material mounting portion 25. The 19 ring-shaped attachment pieces 19b are clamped, and the tip of the ring-shaped seal piece 19a is fixed to the side surface of the valve body 21 in a state of protruding from the surfaces of the valve body 21 and the sealing material holding member 31.

  In this manner, the ring-shaped seal material mounting portion 25 formed on the side surface of the valve body 21 is mounted with the rubber ring-shaped seal material 19, and the seal material is held by the seal material holding member 31 fixed to the holding member fixing groove 30. The ring-shaped mounting piece 19b on the inner peripheral side of the valve 19 is held on the side surface of the valve body 21, and the ring-shaped seal piece 19a on the outer peripheral portion of the seal member 19 is projected from the side surface of the valve body 21 toward the valve seat 18. Therefore, the sealing material 19 can be easily attached to the valve body 21 without using bolts or the like, and the valve body 21 does not need to be provided with a through hole such as a bolt insertion hole. The sealing property of the soft seal gate valve 11 at the time of valve can be ensured.

  Further, by forming the sealing material 19 and the sealing material holding member 31 in a ring shape, the amount of materials used to form them can be reduced, and the weight can be reduced. Furthermore, since other parts such as bolts are not required, the manufacturing cost can be reduced. In addition, even if the valve seat 18 is powder-coated, the sealing material 19 made of flexible rubber can ensure sufficient sealing performance, so that the entire valve box 12 can be powder-coated and the corrosion resistance is improved. be able to.

  The holding member fixing groove for fixing the holding member and the engaging piece fixed to the holding member fixing groove can be formed by a plurality of arcs without forming a complete ring shape. An appropriate notch for easily and surely deforming toward the member fixing groove can be formed.

  DESCRIPTION OF SYMBOLS 11 ... Soft seal gate valve, 12 ... Valve box, 12a ... Valve body insertion groove, 12b ... Pipe body part, 13 ... Opening part, 14 ... Valve body accommodating part, 15 ... Valve body, 16 ... Operation part, 17 ... Valve Rod, 18 ... Valve seat, 19 ... Sealing material, 19a ... Ring-shaped sealing piece, 19b ... Ring-shaped mounting piece, 21 ... Valve body, 22 ... Frame storage section, 23 ... Guide member mounting piece, 24 ... Valve rod storage cylinder , 25 ... Sealing material mounting part, 25a ... Peripheral wall part, 25b ... Bottom face part, 25c ... Step part, 26 ... Female thread member, 27 ... Guide groove, 28 ... Guide member, 29 ... Shaft part sealing material, 30 ... Holding Member fixing groove, 30a ... inclined surface portion, 30b ... engaging surface portion, 31 ... sealing material holding member, 31a ... sealing material holding piece, 31b ... engaging piece, 31c ... engaging protrusion

Claims (1)

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. A ring-shaped valve that is opened when the body is housed in the valve body housing portion, and the valve body is lowered into the valve box and ring-shaped sealing materials provided on both sides of the valve body are provided in the valve box. In the gate valve that is closed when it is brought into contact with the seat,
Applying powder coating to the valve box including the valve seat, and attaching a rubber seal material to the ring-shaped seal material mounting portion formed at a position facing the valve seat in a closed state on the side surface of the valve body And
The sealing material holding member fixed to the holding member fixing groove formed on the side surface of the valve main body holds the inner peripheral portion of the sealing material on the side surface of the valve main body, and the outer peripheral portion of the sealing material from the side surface of the valve main body. Protruding toward the valve seat,
The seal material is attached to the seal material from the inner periphery of the base of the ring-shaped seal piece, and the ring-shaped seal piece that protrudes from the side surface of the valve body toward the valve seat in a state of being mounted on the seal material mounting portion. Formed in a L-shaped cross section by a ring-shaped mounting piece protruding in a direction along the bottom surface of the part,
The sealing material mounting portion includes a peripheral wall portion with which an outer peripheral surface of the ring-shaped seal piece abuts, a bottom surface portion with which a rear surface of the ring-shaped attachment piece abuts, and the holding member provided on the inner peripheral side of the bottom surface portion. With a fixing groove,
The sealing material holding member includes a sealing material holding piece that contacts the surface of the ring-shaped mounting piece of the sealing material and sandwiches the ring-shaped mounting piece between the bottom surface portion and an inner periphery of the sealing material holding piece An engagement piece that is bent in the direction of the valve body from the side and inserted into the holding member fixing groove on the outer peripheral side of the tip, and engaged.
The holding member fixing groove includes an inclined surface portion that is inclined in a direction in which a groove side surface on the inner side of the valve body is deeper toward the inner side of the valve body, and an engaging surface portion that is formed on the outer side of the valve body facing the inclined surface portion. And
When the engagement protrusion provided at the tip of the engagement piece of the sealing material holding member is pressed against the inclined surface portion, the engagement protrusion is deformed along the inclination of the inclined surface portion, whereby the engagement A soft seal gate valve, wherein a projecting piece comes into contact with the engagement surface portion to be in an engaged state .

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