JP2015090183A - Soft sealing gate valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft sealing gate valve capable of surely suppressing melting of a rubber component to water, and exhibiting excellent durability of a guide protrusion of a valve element.SOLUTION: A soft sealing gate valve includes a valve element 2 moved to an opening and closing direction and opening and closing an internal flow passage 10 of a valve casing 1. The valve element 2 includes a valve body 20 having cut-off parts 22 and 23 abutted to valve seat parts 13 and 14 of the valve casing 1, and a guide protrusion 21 fitted in a guide groove 15 of the valve casing 1 and movable in the guide groove 15, and at least the cut-off parts 22 and 23 of the valve body 20 are covered by a rubber material. When the valve element 2 is guided and moved to the closing direction by the guide protrusion 21 and the guide groove 15, the cut-off parts 22 and 23 are abutted to the valve seat parts 13 and 14, and water is cut off by elasticity of the rubber material. The whole outer surface of the rubber material of the valve body 20 is covered by a resin material, and at least a portion of the guide protrusion 21 slidably contacted with the guide groove 15 is covered by the resin material. The resin material of the guide protrusion 21 is thicker than the resin material of the valve body 20.

Description

  The present invention relates to a soft seal gate valve.

  A conventional soft seal gate valve includes a valve box having an internal flow path for water to flow, and a valve body that is provided in the valve box and opens and closes the internal flow path. The valve box has a pair of concave guide grooves formed along the vertical direction (the direction crossing the internal flow path) on its inner surface, and the valve body fits into the guide grooves on both side surfaces in the width direction. And a pair of guide protrusions movable in the guide groove. By rotating the valve rod connected to the valve body, the valve body moves while being guided in the vertical direction by the guide groove and the guide protrusion, and opens and closes the internal flow path in the valve box.

  In such a soft seal gate valve, when the valve body is guided in the vertical direction, the guide projection moves while contacting the guide groove, so that the guide projection is severely worn and the durability is poor. In addition, there is a problem that the torque required for opening and closing the internal flow path increases due to the friction generated at this time.

  By the way, the entire outer surface of the valve body is generally lined with a rubber material and covered with the rubber material. When the valve body is guided downward by the above configuration, the rubber material of the valve body comes into contact with the valve seat formed on the inner surface of the valve box, and the elasticity of the rubber material stops the gap between the valve body and the valve box. Watered. In such a soft seal gate valve, there is a problem that the rubber component of the rubber material dissolves into the water flowing through the internal flow path.

  For example, in the soft seal gate valve of Patent Document 1, the valve body includes a valve body and a soft rubber sealing material provided on both side surfaces in the thickness direction of the valve body. The sealing material is sandwiched between the side surface of the valve body and the holding plate and fixed to the side surface of the valve body. The holding plate is attached so as to cover the outer surface of the sealing material, but the portion of the outer surface of the sealing material that contacts the valve seat of the valve box is not covered, and the entire other portion is covered. According to the said structure, the area of the part exposed to the water of a sealing material can be minimized, and the melt | dissolution to the water of the rubber component of a sealing material can be suppressed.

  However, since the portion of the sealing material that contacts the valve seat is exposed to water by any means, it is impossible to completely prevent the rubber component from dissolving into water. Moreover, the structure of the soft seal gate valve of the document is somewhat complicated.

JP 2013-155770 A

  Therefore, the problem to be solved by the present invention is to provide a soft seal gate valve that more reliably suppresses the dissolution of the rubber component into water and has good durability of the guide projection of the valve body.

In order to solve the above problems, a soft seal gate valve according to the present invention includes a valve box having an internal flow path through which water flows, and a valve that opens and closes the internal flow path by moving in an opening and closing direction across the internal flow path. With body,
The valve box includes a valve seat provided therein, and a guide groove provided in the inside along the opening and closing direction,
The valve body includes a valve main body provided with a water stop portion that comes into contact with the valve seat portion, and a guide protrusion that fits in the guide groove and can move in the guide groove, and at least the valve main body The water stop portion is covered with a rubber material,
When the valve body is guided and moved in the closing direction by the guide protrusion and the guide groove, the water stop portion of the valve body comes into contact with the valve seat portion of the valve box, and the elasticity of the rubber material A soft seal gate valve that stops water,
The entire outer surface of the rubber material of the valve body is covered with a resin material,
At least a portion of the guide protrusion that is in sliding contact with the guide groove is covered with a resin material,
The resin material of the guide protrusion is thicker than the resin material of the valve body.
It is characterized by that.

  Preferably, the guide protrusion includes a guide mounting piece protruding from both side surfaces in the width direction of the valve body, and a resin as the resin material fitted into the guide mounting piece so as to cover an outer surface of the guide mounting piece. A made guide member.

  Preferably, the resin material of the valve body and the resin material of the guide protrusion are made of a fluororesin.

In the valve body of the soft seal gate valve according to the present invention, as described above, at least a portion of the valve body that contacts the valve seat portion of the valve box is covered with a rubber material and further covered with a resin material. Therefore, the rubber material is not exposed to the water flowing through the internal flow path of the valve box. Therefore, it is possible to reliably suppress the rubber component of the rubber material from dissolving into water.
Further, the guide protrusion of the valve body is also covered with a resin material, and the thickness thereof is greater than the thickness of the resin material of the valve body, so that the guide protrusion has high durability.

It is a partial section side view of the soft seal gate valve concerning the present invention, and shows the state where the valve element has closed the internal channel. It is a partial section front view of the soft seal gate valve concerning the present invention, and shows the state where the valve element has opened the internal channel. 3A is a cross-sectional side view of the valve box of the soft seal gate valve, and FIG. 3B is a plan view of FIG. 3A. 4A is a front view of the valve body of the soft seal gate valve, and FIG. 4B is a side view of FIG. 4A. It is sectional drawing of the valve body of FIG.

  Hereinafter, a soft seal gate valve according to the present invention will be described with reference to the drawings.

  1 and 2 show the overall configuration of the soft seal gate valve. A soft seal gate valve is installed in the flow path through which water flows. The soft seal gate valve includes a valve box 1, a valve body 2, a lid 3, and a valve stem 4. The soft seal gate valve is configured such that the valve body 2 can be moved in the vertical direction (opening / closing direction) which is a direction crossing the internal flow path 10 of the valve box 1 by rotating the valve shaft 4 by an operating means (not shown). Has been. The valve body 2 closes the internal flow path 10 as shown in FIG. 1 or opens the internal flow path 10 as shown in FIG. 2 by this vertical movement.

  With reference to FIG. 3, the valve box 1 extends in the horizontal direction, and has a horizontal portion 11 that opens at both sides, and an upper extension portion 12 that extends upward from the center of the horizontal portion 11 and opens at the top. And. An internal channel 10 through which water flows and passes is formed in the horizontal portion 11. Each of the inlet side and the outlet side of the internal flow path 10 of the valve box 1, that is, the openings on both sides of the horizontal portion 11, is connected to a water pipe (not shown) constituting the flow path. As shown in FIGS. 1 and 2, the opening of the upper extending contact portion 12 is connected to the lid 3, and the valve body 2 retracted from the internal flow path 10 is accommodated by the upper extending portion 12 and the lid 3. A valve chamber 30 is formed.

  As shown in FIG. 3, the valve box 1 includes valve seat portions 13 and 14 that contact the valve body 2 when the valve body 2 closes the internal flow path 10 at the center of the inside. The valve seat portions 13 and 14 include an upper valve seat portion 13 and a lower valve seat portion 14. A pair of guide grooves 15 are formed on both sides of the inner flow path 10 in the width direction on the inner surface of the valve box 1. Each of the guide grooves 15 has a concave cross section, and is formed along the vertical direction to guide the valve body 2 in the vertical direction. The inner surface including the valve seats 13 and 14 and the guide groove 15 of the valve box 1 is powder-coated.

  4 and 5, the valve body 2 includes a flat and substantially disc-shaped valve body 20 and a pair of convex projecting protrusions 21 provided on both side surfaces of the valve body 20 in the width direction. Become.

  The valve body 20 includes water stop portions 22 and 23 that stop the water by contacting the valve seat portions 13 and 14 of the valve box 1 on the outer surface thereof. The water stop portions 22 and 23 are formed in an inverted U shape on both side surfaces in the thickness direction of the valve body 20, and the upper water stop portion 22 that contacts the upper valve seat portion 13 of the valve box 1, and the valve body The bottom water stop portion 23 is formed over the entire lower surface of the valve body 20 and abuts against the lower valve seat portion 14 of the valve box 1. As shown in FIGS. 4A and 5, a valve rod insertion hole 24 extending in the vertical direction is formed in the center of the valve body 20.

  As shown in FIG. 5, the valve main body 20 includes a valve main body constituent portion constituted by a core member 25, a rubber material 26 lined on the entire surface of the valve main body constituent portion, and a resin coated on the entire outer surface of the rubber material 26. Material (not shown). That is, the valve body 20 is configured so that the entire surface thereof is covered with the rubber material 26 and further covered with the resin material.

  The rubber material 26 is lined so that the thickness of the water stop portions 22 and 23 is larger than the thickness of other portions. The thickness of the rubber material 26 is, for example, 3 mm to 15 mm.

  The resin material is coated on the entire outer surface of the rubber material 26 and completely covers the rubber material 26 from above. Since the thickness of the resin material is basically considerably smaller than the thickness of the rubber material 26, the illustration thereof is omitted. The thickness of the resin material is set to a thickness that does not prevent water stoppage between the valve seat portions 13 and 14 and the water stop portions 22 and 23 due to the elasticity of the rubber material 26. For example, the thickness is 100 μm to 200 μm. is there.

  The core material 25 is made of, for example, spheroidal graphite cast iron. The rubber material 26 is made of, for example, ethylene propylene rubber or chloroprene rubber. The resin material is made of water-resistant resin, for example, fluorine resin. In addition to the fluororesin, the resin material may be, for example, a polyethylene resin (preferably a high density polyethylene resin), a polyacetal resin, or the like. In this embodiment, the resin material is made of polytetrafluoroethylene (Teflon (registered trademark)), which is an example of a fluororesin.

  Each of the pair of guide protrusions 21 fits in the guide groove 15 of the valve box 1 and can move in the guide groove 15, thereby guiding the valve body 20 in the vertical direction. The entire outer surface of the guide protrusion 21 is also covered with a resin material. The thickness of the resin material of the guide protrusion 21 is set to be greater than the thickness of the resin material of the valve body 20.

  Specifically, in the present embodiment, each of the guide protrusions 21 includes a guide mounting piece 27 and a guide member 28 as a resin material. The guide mounting piece 27 is composed of the core member 25 and is formed so as to protrude from both side surfaces in the width direction of the valve body constituting portion of the core member 25. The guide mounting piece 27 is not covered with the rubber material 26. The guide member 28 is made of resin. When the guide member 28 is fitted into the guide mounting piece 27 so as to cover the guide mounting piece 27, the guide protrusion 21 whose entire outer surface is covered with a resin material is formed. The thickness of the guide member 28 is set to be greater than the thickness of the resin material of the valve body 20.

  The resin material of the guide member 28 is made of a fluorine resin such as polytetrafluoroethylene, a high-density polyethylene resin, a polyacetal resin, or the like, like the resin material of the valve body 20. The resin material of the guide member 28 is preferably made of a resin having water resistance and a low friction coefficient. In this embodiment, the guide member 28 is made of polytetrafluoroethylene, like the resin material of the valve body 20.

  By the said structure, the valve body 2 whole surface is covered with a resin material.

  Referring again to FIG. 1, the valve body 2 is disposed in the valve box 1. The valve stem 4 is arranged coaxially with the valve stem insertion hole 24 of the valve body 2, and a male screw (not shown) formed on the valve stem 4 is engaged with a female screw top 40 attached to the upper part of the valve body 2. Match. With this configuration, when the valve stem 4 is rotated, the valve body 2 moves while being guided in the vertical direction by the guide protrusion 21 and the guide groove 15 (see FIG. 2 and the like).

  As shown in FIG. 1, when the valve body 2 moves downward (closed direction) and enters the internal flow path 10, the upper water stop portion 22 of the valve body 2 contacts the upper valve seat portion 13 of the valve box 1. At the same time, the bottom water stop 23 of the valve body 2 contacts the lower valve seat 14 of the valve box 1. At this time, due to the elasticity of the rubber material 26 of the valve body 20, water is stopped between the upper water stop portion 22 and the upper valve seat portion 13, and water is stopped between the lower water stop portion 23 and the lower valve seat portion 14. Is done. Thereby, the internal flow path 10 is closed.

  As shown in FIG. 2, the valve body 2 moves upward (in the opening direction), moves away from the internal flow path 10, and is accommodated in the valve chamber 30, whereby the internal flow path 10 is completely opened.

  According to the soft seal gate valve according to the present invention having the above configuration, since the resin material covers the entire outer surface of the rubber material 26 of the valve body 20, the rubber material 26 may be exposed to water flowing through the internal flow path 10. Absent. Therefore, the rubber component of the rubber material 26 does not dissolve in water.

  Further, when the valve body 4 is rotated to move the valve body 2 in the vertical direction, the guide protrusion 21 is slidably in contact with the guide groove 15, but the outer surface of the guide protrusion 21 is covered with a resin material (resin Since the made guide member 28 is mounted), the friction between the guide protrusion 21 and the guide groove 15 is reduced, and as a result, the torque required for opening and closing the internal flow path 10 is reduced. Moreover, since the thickness of the resin material of the guide protrusion 21 is thicker than the thickness of the resin material of the valve body 20, the guide protrusion 21 has sufficient durability.

The above is one embodiment of the soft seal gate valve according to the present invention, but the soft seal gate valve according to the present invention is not limited to the embodiment.
In the embodiment, the rubber material 26 is lined on the entire valve body 20 and the resin material is further coated thereon, but this need not be the case. The rubber material 26 is in contact with at least the valve seats 13 and 14 of the valve body 1 of the valve body 20 so as to cover the place where water stop is performed, that is, so as to cover at least the water stop portions 22 and 23 of the valve body 20. It only has to be applied. The resin material is applied so as to cover the entire outer surface of the rubber material 26. Accordingly, the rubber component 26 of the rubber material 26 is prevented from being dissolved into water.

  Further, in the embodiment, the guide protrusion 21 is configured to be entirely covered with the resin material by the resin guide member 28 attached to the guide attachment piece 27, but this need not be the case. . The resin material may be applied to at least a portion of the guide projection 21 that is in sliding contact with the guide groove 15. Thereby, the improvement of the durability of the guide protrusion 21 is achieved.

Next, an embodiment of a method for manufacturing the valve body 2 of the soft seal gate valve of the above embodiment will be described.
First, a core member 25 comprising a valve body constituting part constituting the valve body 20 and a guide mounting piece 27 constituting the guide projection 21 is prepared. As described above, the core material 25 is made of, for example, spheroidal graphite cast iron, and is cast using a predetermined mold.

Next, the rubber material 26 is lined on the entire surface of the valve body constituting portion of the core material 25.
In this lining process, for example, a rubber material is first lined on the entire surface of the core material 25 (that is, the entire surface of the valve main body component and the guide mounting piece 27), and then the rubber material lined on the guide mounting piece 27 is peeled off. You may go by.
More specifically, in the above process, the primer and the adhesive are not applied to the guide mounting piece 27, but are applied only to the valve body component, and then the rubber material is lined all over the core material 25, Vulcanization and pressure bonding are performed, and then the rubber material 26 of the guide mounting piece 27 is cut off.

  Next, the resin guide member 28 is fitted into each guide mounting piece 27 so as to cover the entire guide mounting piece 27.

Then, the resin material is coated on the entire outer surface of the rubber material 26 lined on the valve main body constituting portion.
This step may be performed by coating the resin material over the entire surface of the valve body 2, that is, not only the entire outer surface of the lined rubber material 26, but also the entire outer surface of the attached guide member 28.
The valve body 2 described above is completed through the above steps.

1 Valve box 10 Internal flow path 13, 14 Valve seat part (upper valve seat part, lower valve seat part)
15 Guide groove 2 Valve body 20 Valve body 21 Guide protrusions 22 and 23 Water stop portion (upper water stop portion, lower water stop portion)
26 Rubber material 27 Guide mounting piece 28 Guide member 3 Lid 4 Valve stem

Claims (3)

A valve box having an internal flow path through which water flows, and a valve body that moves in an opening and closing direction across the internal flow path to open and close the internal flow path,
The valve box includes a valve seat provided therein, and a guide groove provided in the inside along the opening and closing direction,
The valve body includes a valve main body provided with a water stop portion that comes into contact with the valve seat portion, and a guide protrusion that fits in the guide groove and can move in the guide groove, and at least the valve main body The water stop portion is covered with a rubber material,
When the valve body is guided and moved in the closing direction by the guide protrusion and the guide groove, the water stop portion of the valve body comes into contact with the valve seat portion of the valve box, and the elasticity of the rubber material A soft seal gate valve that stops water,
The entire outer surface of the rubber material of the valve body is covered with a resin material,
At least a portion of the guide protrusion that is in sliding contact with the guide groove is covered with a resin material,
The resin material of the guide protrusion is thicker than the resin material of the valve body.
Soft seal gate valve characterized by that.   The guide protrusion includes a guide mounting piece protruding from both side surfaces in the width direction of the valve body, and a resin guide as the resin material fitted into the guide mounting piece so as to cover the outer surface of the guide mounting piece. The soft seal gate valve according to claim 1, further comprising a member.   The soft seal gate valve according to claim 1 or 2, wherein the resin material of the valve main body and the resin material of the guide protrusion are made of a fluororesin.

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