JPS643881Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a plastic ball valve, and more specifically, to a plastic ball valve that does not require a pit or a valve casing during underground construction.

BACKGROUND OF THE INVENTION Ball valves are installed in underground pipes for transporting various fluids such as water and sewage, natural gas, and city gas to control the transport of these fluids.

Conventionally, when installing this ball valve in underground pipes for transporting city gas, a metal ball valve 3 is used as shown in FIG.
Steel pipes 31, 31 are connected to both sides of 0, and these steel pipes 31, 31 are further connected to polyethylene pipes 33, 33 via mechanical joints 32, 32, and the metal ball valve 30 itself is a large diameter valve. is housed and protected in a pit 34 and buried under the ground 35 together with this pit 34 (for example, according to the Japan Gas Association "Gas Polyethylene Pipe Construction and Maintenance Manual" January 1982,
(see page 35), and for small diameter valves,
A protective tube is buried just above the valve to protect it and make it easier to open and close the valve.

On the other hand, plastic ball valves, which have excellent corrosion resistance and are easy to process, are used in piping for water, pure water, chemicals, corrosive fluids, food-related fluids, etc. due to their advantages. Recently, consideration has been given to using these metal ball valves in place of the metal ball valves for natural gas and city gas transportation piping. These plastic ball valves for gas are disclosed in JP-A-52-37230 and JP-A-59-103090.
The former is based on a structure in which the ends of the main body of the ball valve assembly are fused from both sides, while the latter is based on a structure in which a valve body cover is fitted and attached to one side of the body.
The basic structure is that the body cap is fused to the body main body and valve body cover.

Problems to be Solved by the Invention However, even if the plastic ball valve disclosed in the above-mentioned publication is used in place of a conventional composite valve, the pit or valve cannot be used, especially considering its external structure. Installation of a housing or protection tube is required.

Further, the pit or valve housing system used to protect large-diameter valves has the advantage of protecting the valves from sand and water, but has problems such as being time-consuming and expensive to construct. On the other hand, with the protection pipe method, construction costs are low, but there are problems such as sand, water, etc. entering the protection pipe and burying the valve drive part, which can interfere with the opening and closing operations of the valve.

In view of the above-mentioned problems, the present invention aims to provide a plastic ball valve that is inexpensive and suitable for simple and easy burial construction.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is constructed so that the protection tube can be directly engaged with the ball valve body. That is, the present invention includes a valve body having a valve chamber, a ball valve body rotatably mounted in the valve chamber, and one end of which is connected to the ball valve body so as to rotate the ball valve body. A spindle rotatably supported on the neck of the valve body, and a cap that is fitted simultaneously to the spindle and the neck of the valve body and into which one end of a cap opener separate from the valve body can be fitted. The valve body is characterized by a plastic ball valve provided with a sleeve that surrounds the cap and into which an embedded protection tube can be slidably fitted on the outer periphery of the sleeve.

The plastic ball valve referred to in the present invention refers to a ball valve mainly made of vinyl chloride resin, polyvinylidene fluoride resin, polyethylene resin, polypropylene resin, etc. A type in which the male part and male part are integrated by adhesive or screwing,
This includes all types of ball valves, such as flexible types with body caps fixed on both sides of the main body with cap nuts, or integrally molded types.

In the present invention, the cross-sectional shape of the sleeve provided on the valve body may be a polygon such as a quadrangle or a hexagon, or an annular shape such as a circle or an ellipse, and is not particularly limited. The sleeve may be positioned anywhere as long as it does not contact the cap and surrounds it. However, it is preferable that the valve body is provided in a concentric circle centered on the axis of the neck of the valve body. Further, the thickness and height of this sleeve are not particularly limited, and any material may be used as long as it has sufficient strength to support a buried protection tube or the like that is used while being connected to the sleeve. Furthermore, there are various ways to attach this sleeve to the valve body, including integral molding, fusion bonding, or adhesion, and although there are no particular limitations, integral molding is preferable in terms of productivity and cost. It is.

Function: In the present invention, the sleeve provided on the valve body so as to surround the cap allows a buried protective tube to be attached to the outer periphery of the sleeve. Therefore,
This protection tube can be engaged with the valve body, and even if the valve body is buried underground, dirt, water, etc. can be prevented from entering the spindle and cap part, that is, the driving part of the ball valve. Furthermore, since this sleeve allows sliding engagement of the protection tube, even if earth pressure is applied to the protection tube, the protection tube slides to prevent earth pressure from being directly applied to the ball valve.

Example Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a gas ball valve according to an embodiment of the present invention, which is mainly composed of polyethylene resin. In the figure, 1 is the valve body, which includes a valve chamber 2,
It has an end portion 4 forming a flow path 3, a neck portion 5 projecting perpendicularly to the axis of the flow path 3, and an annular sleeve 6 formed concentrically on the outside thereof, and the entire body is formed in a cylindrical shape. ing. A ball valve body 7 is rotatably mounted in the valve chamber 2, and the side of the valve body 1 facing the ball valve body 7 has an outer diameter smaller than the inner diameter of the valve chamber 2. An annular protrusion 8 is provided, and a seat ring 9 that contacts the ball valve body 7 is fitted into an annular groove with a rectangular cross section provided in the protrusion 8 . A body cap 11 is fixed to an end face 10 of the valve body 1 opposite to the end 4 by welding. This body cap 11 also has a flow path 12, and an annular protrusion 1 whose diameter is smaller than the inner diameter of the valve chamber 2 is provided on the side facing the ball valve body 7.
3 is provided, and a seat ring 14 in contact with the ball valve body 7 is fitted into an annular groove with a rectangular cross section provided in the protrusion 13. A spindle 15 is rotatably supported inside the neck portion 5 of the valve body 1. This spindle 15 maintains a sealing property with the neck portion 5 by an O-ring fitted into an annular groove provided in the spindle itself. Further, the lower end of the spindle 15 is connected and engaged with the ball valve body 7, and its rotation causes the ball valve body 7 to rotate, thereby opening and closing communication between the flow paths 3 and 12. Further, the upper end of the spindle 15 has a substantially rectangular cross section as shown in FIG. It is fitted onto the outer periphery of the neck portion 5 of the main body 1. Therefore, by rotating the cap 16 with a cap opener (not shown), the spindle 15 is rotated, and the ball valve body 7 is accordingly rotated.

The annular sleeve 6 is integrally formed with the valve body 1 and is provided at a position so as to surround the outer periphery of the lower end of the cap 16. Further, since the valve body 1 is cylindrical, it is relatively difficult to provide the annular sleeve 6 integrally with the valve body 1.
As shown in FIG. 3, the neck 5 of the valve body 1
A flat part 17 is formed around the flat part 17, and the flat part 17 is provided on the flat part 17. On the outer periphery of the annular sleeve 6, when burying the ball valve, a burying protective tube 19 having a flange 18 as shown by the broken line is installed.
O fitted into an annular groove provided inside
It is attached via a ring 20.

Effects of the invention In this invention, a sleeve is provided integrally with the valve body around the neck of the valve body supporting the spindle and the cap that is fitted on the spindle at the same time. The protective tube can be connected to the valve body, preventing dirt and water from entering the cap and spindle, that is, the valve drive part.Also, since the cap part is not buried in sand or water, it is easier to operate the valve drive part. can be easily done at any time. In addition, since this sleeve slidably engages the buried protection pipe, even if earth pressure is applied to this protection pipe, the protection pipe will slide, thereby preventing earth pressure from being applied directly to the ball valve. Damage to the ball valve can be prevented. Furthermore, when constructing underground construction facilities, there is no need to install pits or valve casings as in the past, reducing construction costs, and the underground construction can be done simply and easily, and can be completed in a short time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is a side view of the same embodiment with the cap omitted;
Fig. 3 is a perspective view of the same embodiment with the cap omitted; Fig. 4 is an underground construction drawing of the same embodiment;
Figure 5 is a construction drawing for underground burial using the conventional pit type. 1... Valve body, 2... Valve chamber, 5... Neck,
6... Sleeve, 7... Ball valve body, 15... Spindle, 16... Cap, 19... Buried protection tube.

Claims (1)

[Claims for Utility Model Registration] 1. A valve body having a valve chamber, a ball valve body rotatably mounted in the valve chamber, and one end of which is attached to the ball valve body so as to rotate the ball valve body. a spindle connected and rotatably supported by the neck of the valve body, and one end of a cap opener that is fitted simultaneously to the spindle and the neck of the valve body and is separate from the valve body; 1. A plastic ball valve, comprising: a cap; the valve body is provided with a sleeve that surrounds the cap and into which an embedded protective tube can be slidably fitted. 2. The plastic ball valve according to claim 1, wherein the sleeve is integrally molded with the valve body.