JPH0112032Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to a gate valve device, for example, the configuration of a valve body that is inserted into a synthetic resin valve box used in a water main etc. Regarding.

(Prior art) Most conventional gate valves were made of cast iron, but recently gate valves for water supply, in particular, have been replaced with so-called soft-seal type cast iron gates with a rubber lining because red water comes out due to rust. Valve is known. This soft seal valve is lined with rubber or synthetic resin on the inner and outer surfaces of the valve body and the entire circumference of the valve body, so there is no place where the cast surface comes into direct contact with water, so it will not rust.
Since there is no pocket at the bottom of the valve seat, it has excellent features such as preventing dirt from accumulating. However, since the valve body and valve body are made of cast iron, it is heavy and difficult to install, and the valve is difficult to install. Since the inner and outer surfaces of the box and the entire circumference of the valve body are lined with rubber or synthetic resin, the frictional resistance between the sliding surface between the valve body and the inside of the valve body is large, making it difficult to slide, causing wear and tear, and the cast surface surface is damaged. There are flaws that are exposed. There are also gate valves made of synthetic resin that solve the weight and frictional resistance of cast iron gate valves, especially those in which the valve body and valve body are molded from vinyl chloride resin and rubber is glued to the outer periphery of the valve body. Since the valve body is entirely made of synthetic resin, it is extremely lightweight and has excellent construction properties.
If the flow rate is high, there is a risk that the valve body and rubber may separate.

In addition, as described in Japanese Utility Model Application Publication No. 58-97360, the lower outer circumferential surface of the valve body is covered with an elastic cover, and the inside of the cylinder that protrudes upward from the valve body from the upper outer circumferential surface to the upper end surface is vertically moved. A sliding guide body is fitted, a shaft hole is formed from the upper end surface of the guide body to the center of the valve body, and the valve body is inserted into the female threaded tube fitted into the upper part of this shaft hole, and the guide body and the elastic cover body are connected to each other. A gate valve device is known that has a structure in which a valve shaft that is moved up and down together with the valve shaft is screwed onto the valve shaft.

(Problems to be solved by the invention) In the gate valve device described in the above-mentioned Japanese Utility Model Application Publication No. 58-97360, when the valve body is made of cast iron, the valve body is pulled up from the flow path into the cylindrical body of the valve box. At this time, there is a problem in that fluid flows into the cylinder through the gap between the cylinder and the guide body, and further flows down into the shaft hole through the gap in the valve stem, wetting the cast iron valve body and causing rusting.

Furthermore, if the valve body is made of synthetic resin, there will be no problem of rust, but there will be problems with strength and deformation.

In view of the above-mentioned problems, the purpose of the present invention is to provide a gate valve device that does not generate rust, is robust, lightweight, has little friction when sliding in a valve box, is easy to open and close, and is leak-free. It is something.

[Structure of the idea]

(Means for Solving the Problems) The gate valve device of the present invention includes a pipe portion constituting a flow path and a hollow cylindrical portion protruding upward from a peripheral opening of the pipe portion. a synthetic resin valve box having a valve seat formed therein; and a substantially conical lower end formed in a substantially spherical shape that is inserted into the flow path of the pipe section from the hollow cylinder section through the opening section and comes into contact with and separates from the valve seat. In the gate valve device, the valve body includes a hollow, substantially conical cast iron core having a through hole at its bottom, and a core made of cast iron that covers the outer surface of the core and extends along the through hole. A rubber cover body is folded back to the inner surface and integrally baked and fixed to the inner and outer surfaces, and a guide portion is fitted into the core body and fixed with adhesive, and the guide portion is fitted into the hollow cylindrical portion of the valve body at the upper end. The lower end of the guide portion of the core body of the valve body is crimped to the upper edge of the rubber cover body fitted onto the outer surface of the core body. The outer periphery of the guide part is slidably fitted internally into the hollow cylindrical part of the valve box, and the center of the core body is connected to a valve shaft insertion hole having a female thread part, and the lower end is opened. A space for advancing and retracting the valve shaft is formed, and a lower end opening edge of the space of the core body is crimped to an upper end edge of the rubber cover body engaged on the annular step portion of the inner wall of the core body.

(Function) The gate valve device of the present invention improves the sealing performance of the valve body due to the elasticity of the rubber cover when the flow path is shut off, and when the valve body is pulled up to the hollow cylinder, the hollow cylinder and the valve body Water that has entered the hollow cylinder through the gap flows down through the gap between the valve stem and the female thread into the space surrounded by the cast iron core, but the inner surface of the cast iron core is surrounded by the synthetic resin core and the rubber cover. Since it is covered by the core body, there is no risk of rust forming on the inner surface of the core body. Further, when the valve body is slid within the hollow cylindrical portion of the valve box when opening and closing the valve body, there is little friction since both valve bodies are made of synthetic resin. Furthermore, the rubber cover body is baked from the outer surface of the cast iron core to the inner surface of the bottom, the outer upper edge is crimped to the upper edge of the core by the guide part of the core, and the inner upper edge is the lower edge of the core. Since the rubber cover body is crimped to the annular stepped portion of the core body wall by the rubber cover body, the rubber cover body will not peel off from the core body even with high-speed, high-pressure water flow, and the rubber cover body will not peel off from the core body from the inner and outer upper ends of the rubber cover body to the core body side. water will not enter.

(Example) An example of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes a valve box made of hard vinyl chloride resin, which consists of a pipe section 3 constituting a flow passage 2, a valve seat 4, and a hollow cylinder section 5. A valve seat 4 is integrally formed below, and the lower end of the valve seat 4 is flush with the bottom surface of the flow passage 2. Further, a hollow cylindrical portion 5 is integrally formed to protrude upward from the opening 6. Flanges 7 are provided at both ends of the tube portion 3 and at the upper end of the hollow cylinder portion 5, respectively.
7 and 8 are formed. Further, a valve bearing plate 9 is fitted and engaged with the upper end opening of the hollow cylindrical portion 5, and a lid body 1 is placed on the valve bearing plate 9 via a thrust bearing plate 10.
1 is fitted onto the flange 8 and fixed to the flange 8 with bolts 12.

Reference numeral 13 denotes a valve body, which includes a hollow, substantially conical cast iron core body 14 with an open upper end, a rubber cover body 15 that is fitted onto the core body 14 and fixed by baking, and a rubber cover body 15 that is fitted into the core body 14. The core body 16 is made of vinyl chloride resin and is fixed with an adhesive.The lower end is formed into a substantially hemispherical conical shape and is formed to be tightly fitted onto the valve seat 4 of the valve body 1. ing.

The cast iron core body 14 has a through hole 17 formed at its lower bottom, an annular step 19 formed at the inner periphery of the upper opening edge 18, and an annular step 20 formed at the inner periphery near the lower end. .

The rubber cover body 15 is baked and fixed to the outer surface and the inner surface of the bottom part of the core body 14, and the upper edge of the outer surface side is attached to the core body 1.
The upper end opening edge 18 of 4 is covered by an annular step 19 on the inner periphery of the upper end, and the lower end is folded back toward the inner surface along the through hole 17 at the bottom of the core 14 and fixed by baking to the inner surface of the bottom of the core 14. The upper edge 32 on the inner surface side is an annular stepped portion 20 formed on the lower inner wall of the core body 14.
is engaged on top.

A core body 16 made of vinyl chloride resin is internally fitted into the core body 14 and attached to the core body 1 with an epoxy resin adhesive.
It is adhesively fixed to the inner surface of 4. Further, the core body 16 is formed with a protruding portion 21 that protrudes upward from the core body 14, and a vinyl chloride resin guide portion 22 that is internally fitted into the hollow cylindrical portion 5 of the valve box 1 is formed in this protruding portion 21. It is fitted and fixed integrally to the upper end of the protrusion 21 with a screw 23. And this guide part 2
The inner side of the lower end surface of 2 strongly presses the annular protrusion 24 formed on the upper end surface of the rubber cover body 15 to press the upper edge of the rubber cover body 15 to the upper end of the core body 14, and the outer periphery of the annular protrusion 24 The outer side of the lower end surface of the guide portion 22 is engaged with the annular recess 25 to prevent the rubber cover body 15 from escaping. And guide part 2
A guide protrusion 27 formed in the inner circumferential axial direction of the hollow cylinder portion 5 is slidably engaged with a guide groove 26 formed in the outer circumferential axial direction of the hollow cylinder portion 2 . Further, a valve shaft insertion hole 2 is provided at the center of the guide portion 22 and the core body 16.
8 is formed, and a female threaded brass metal fitting, which is integrally insert-molded at the time of molding the core body 16, is embedded in the inner periphery of this insertion hole 28 with the inner periphery protruding slightly inward to form a female threaded part 29. ing. Furthermore, at the lower end of this insertion hole 28, a core body 1 with a diameter larger than this is provided.
A space 30 is formed that is open to the lower end of 6. The lower opening edge 31 of the core body 16 connects the end edge portion 32 of the rubber cover body 15 baked and fixed to the bottom inner surface of the core body 14 to the annular stepped portion 2 on the inner circumference of the core body 14.
It is crimped to 0. An annular projection 33 that bites into the upper edge 32 of the rubber cover body 15 (or an annular recess into which the upper edge 32 of the rubber cover body 15 bites) is formed on the lower opening edge 31 of the core body 16.
Further, an annular space 34 is formed between the inner peripheral surface of the core body 14 and the outer peripheral surface of the intermediate core body 16, and a lock ring 35 is fitted into this annular cavity 34 to further firmly connect the two. .

35 is a stainless steel valve shaft, which is connected to the female threaded portion 29.
A threaded portion 37 that is screwed into the valve body 13 to move the valve body 13 up and down.
and the valve bearing plate 9, thrust bearing plate 10, and lid body 11.
The large diameter part 39 formed in the middle is rotatably fitted into the recess 40 of the valve bearing plate 9, and the upper surface is connected to the thrust bearing plate 10.
is engaged to prevent movement in the axial direction. In FIG. 2, numeral 41 indicates a protrusion that is slightly bulged.

Next, the operation of the above embodiment will be explained.

When the valve shaft 36 is rotated clockwise in FIG. Since it is regulated by the guide protrusion 27 of the cylindrical portion 5, the valve body 13 is
The guide portion 22 slides its guide groove 26 along the guide protrusion 27 of the hollow cylinder portion 5 and rises inside the hollow cylinder portion 5 of the valve box 1, and the valve seat 4 of the flow path 2 is moved up.
distance from. The threaded portion 37 of the valve stem 36 is connected to the valve body 1.
Proceed to the space 30 of No. 3. Water that has entered the hollow cylinder through the gap between the hollow cylinder and the valve body flows down through the gap between the valve stem and the female thread into the space surrounded by the cast iron core, but the inner surface of the cast iron core is made of synthetic resin. Since the core is covered by the core and the rubber cover, there is no risk of rust forming on the inner surface of the core.

Next, when the valve shaft 36 is rotated counterclockwise with the valve body 13 in the open state, the valve body 13 is rotated counterclockwise.
3 descends through the hollow cylindrical portion 5 and comes into close contact with the valve seat 4, closing the flow path 2.

During the opening and closing operations as described above, the vinyl chloride resin guide portion 22 of the valve body 13 slides on the hollow cylinder portion 5 of the vinyl chloride resin valve box 1, so there is little friction, smooth operation, and little wear. Also, cast iron core 1
4 is baked with a rubber cover body 15, the upper end of which is crimped to the core body 14 by a guide part 22, and the inner end is a core body 16 made of vinyl chloride resin fixed to the inner surface of the core body 14 with adhesive. Because it is crimped onto the annular step 20 of the core body 14, it will not peel off due to high-speed, high-pressure water flow, and water will not circulate around the cast surface of the core body 14. 14, there is no risk of rusting.

In the above embodiment, the core body 16 made of vinyl chloride resin and the guide portion 22 made of vinyl chloride resin were made into separate members and secured with screws, but they may be integrally molded. Further, the through hole 17 of the cast iron core body 14 does not necessarily have to be located at the lower end.

[Effect of idea]

According to the present invention, the valve body and the valve body are made of synthetic resin and rubber, except for the cast iron core and female threads, so they are lightweight and easy to work with, and since the core is made of cast iron, they have good mechanical strength. It is large and has little risk of deformation or damage. In addition, since the guide part of the core body, which is the sliding part of the valve body, is made of synthetic resin, there is less friction with the hollow cylindrical part of the synthetic resin valve box on which it slides, and the opening and closing of the main body is smooth and wear-free. few. The cast iron core is coated with a rubber cover baked from its outer surface to part of its inner surface, so it will not peel off even when exposed to high-speed, high-pressure water flow.Moreover, the upper end of the rubber cover is a guide for the center core. pressed against the core body by the part, and
The other end is folded inward in a series from the through hole of the core body and is crimped to the inner wall of the core body by the opening edge of the lower end of the middle core body, so water does not enter from the upper end or inner end. There is no risk of water circulating on the casting surface of the core and causing rust. Furthermore, when the valve body is pulled up into the hollow cylinder, water that has entered the hollow cylinder through the gap between the hollow cylinder and the valve body flows down through the gap between the valve stem and the female thread into the space surrounded by the cast iron core. Since the inner surface of the cast iron core is covered with a synthetic resin core and a rubber cover, there is no risk of rust forming on the inner surface of the core.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of a gate valve device showing an embodiment of the present invention, and FIG. 2 is a partially cutaway side view of the same. 1... Synthetic resin valve box, 2... Distribution path, 3...
Pipe part, 4...Valve seat, 5...Hollow cylinder part, 6...Opening part, 13...Valve body, 14...Cast iron core, 15
...Rubber cover body, 16...Synthetic resin core body,
17... Through hole, 20... Annular step part, 22... Guide part, 28... Valve shaft insertion hole, 29... Female thread part,
30... Space portion, 31... Opening edge, 32... Upper edge.

Claims (1)

[Claims for Utility Model Registration] A synthetic resin valve box consisting of a pipe portion constituting a flow path and a hollow cylinder portion projecting upward from the peripheral opening of the pipe portion, and forming a valve seat in the flow path. and a substantially conical valve body having a substantially spherical lower end that is inserted from the hollow cylindrical portion into the flow path of the tube portion through the opening and comes into contact with and separates from the valve seat. In the device, the valve body includes a hollow, substantially conical cast iron core having a through hole at the bottom, and a core body that covers the outer surface of the core and is folded back to the inner surface along the through hole so as to be integral with the inner and outer surfaces. A rubber cover body fixed by baking, and a synthetic resin medium fitted into the core body and fixed with adhesive, and having a guide portion protruding upward from the core body at the upper end to be fitted into the hollow cylindrical portion of the valve body. The lower end of the guide portion of the central core of the valve body is crimped to the upper edge of the rubber cover fitted to the outer surface of the core, and the outer periphery of the guide portion is connected to the hollow cylinder of the valve box. a valve shaft insertion hole having a female threaded portion and a valve shaft advancement/retraction space portion communicating with the insertion hole and having an open lower end at the center of the core body; A gate valve device characterized in that a lower end opening edge of a space of the core body is crimped to an upper end edge of the rubber cover body engaged on an annular step portion of the inner wall of the core body.