JP2002115767A - Ball valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball valve in use for connection to a gas supply pipe or a city water pipe, preventing leakage from a seat by improving the sealing performance at a seat ring portion. SOLUTION: The ball valve comprises a body 5 having two vent pipe lines formed therein and a ball 7 turnably mounted on the body 5 via two seat rings 6 with its vent hole adaptable to communicate concurrently with the vent pipe lines of the body 5. Each seat ring 6 to be used is an inclination control ring 62 movably engaging a ring body 61 so that its pipe center CT2 can be three- dimensionally inclined to a pipe center CT1 of the ring body 61. Thus, if the body 5 is finished out of spec, the inclination control ring 62 as each seat ring 6 is moved to the ring body 61 to cause no gap between the body 5 and each seat ring 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball valve connected to various pipes such as a gas supply pipe and a water pipe.

[0002]

2. Description of the Related Art Conventionally, in a ball valve of this type, a ball is rotatably mounted on a body via a seat ring as disclosed in Japanese Patent No. 2671763 and Japanese Patent Application Laid-Open No. 10-325472. Those having such a structure have been widely used.

[0003]

However, especially when a body made of a synthetic resin such as polyethylene is manufactured by injection molding, the body is often not technically finished as designed. Even if the situation is the same, there is a disadvantage that a gap is generated between the body and the seat ring, the sealing performance is reduced, and a seat leak is caused.

SUMMARY OF THE INVENTION [0004] In view of such circumstances, an object of the present invention is to provide a ball valve capable of improving the sealing performance at a seat ring portion and preventing a seat from leaking.

[0005]

SUMMARY OF THE INVENTION In the present invention, attention has been paid to preventing a gap from being formed between a body and a body by devising a shape of a seat ring and the like.

That is, the invention according to claim 1 of the present invention has a body (5) in which two ventilation pipes (5a, 5b) are formed, and the body has two seat rings (6). In the ball valve (1) in which the ball (7) is rotatably mounted so that the ventilation hole (7a) of the ball (7a) can simultaneously communicate with each ventilation pipe of the body, a ring body as each of the seat rings At (61), tilt adjustment ring (6
2) replaces the core (CT2) with the core (C
T1) is configured to be movably attached so as to be three-dimensionally inclined with respect to T1).

By adopting such a structure, when the finish of the body slightly deviates from the design, the inclination adjusting ring of each seat ring moves with respect to the ring main body,
It acts to prevent a situation in which a gap is formed between the body and each seat ring.

In the invention according to claim 2 of the present invention, the material of the main components of the ball valve (1) is made of synthetic resin.

Further, the invention according to claim 3 of the present invention is configured such that the hardness of the inclination adjusting ring (62) is smaller than the hardness of the ring main body (61). With such a configuration, the tilt adjusting ring acts so as to be smoothly moved with respect to the ring main body.

It should be noted that reference numerals in parentheses are for convenience showing corresponding elements in the drawings, and therefore, the present invention is not limited to the description on the drawings. The same applies to the column of “Claims”.

[0011]

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

FIG. 1 is a front sectional view showing an embodiment of the ball valve according to the present invention, FIG. 2 is a view showing a seat ring of the ball valve shown in FIG. 1, (a) is a front view thereof, (b) is a horizontal sectional view showing a first use state, and (c) is a horizontal sectional view showing a second use state.

As shown in FIG. 1, the ball valve 1 has a polyethylene body 5 welded to connect two polyethylene gas supply pipes 2 and 3,
The body 5 has two ventilation pipes 5a and 5b. The body 5 has a guide 9 made of polyethylene.
A ball 9 made of polyoxymethylene (polyacetal) is rotatably mounted on the guide 9 via two seat rings 6 located on both left and right sides thereof. The ball 7 has a ventilation hole 7a formed so as to be able to communicate with the ventilation pipes 5a and 5b of the body 5 at the same time. Further, a polyethylene bonnet 10 is mounted on the upper side of the body 5 in a form fixed by a plurality of bolts 12, and a stainless steel stem 13 is rotatably supported in the bonnet 10. .
Here, since the lower portion of the stem 13 is engaged with the ball 7, if the stem 13 is rotated, the ball 7 rotates in the same direction and the same angle in conjunction with the rotation of the stem 13 to open and close the ball valve 1. be able to. A cap 15 made of polyethylene is detachably mounted on the upper side of the stem 13.

As shown in FIG. 2, each of the seat rings 6 is made of an annularly formed nitrile rubber (NBR).
A ring adjusting member 62 made of a nitrile rubber and having an annular shape is engaged with the ring main body 61. Here, since there is a certain gap between the ring main body 61 and the tilt adjusting ring 62, the tilt adjusting ring 62 is, as shown in FIGS. 2B and 2C,
The core CT2 is movable within a predetermined range so as to be three-dimensionally inclined with respect to the core CT1 of the ring main body 61. Further, a ring main body 61 and a tilt adjusting ring 62
Are 70 ° and 50 °, respectively.

Therefore, in the ball valve 1, even if the finish of the body 5 is slightly deviated from the design, the inclination adjusting ring 62 of each seat ring 6 moves with respect to the ring main body 61, so that the body 5 and each seat ring 6 can be prevented. As a result, the sealing performance of the ball valve 1 is improved, and seat leakage can be prevented. Further, since all the main components (the body 5, the ball 7, the guide 9, the bonnet 10, and the cap 15) of the ball valve 1 are made of synthetic resin, the ball valve 1 is lightweight and has excellent corrosion resistance. In addition, since the hardness of the tilt adjusting ring 62 of each seat ring 6 is smaller than the hardness of the ring main body 61, the tilt adjusting ring 62 is smoothly moved with respect to the ring main body 61. Even when an earthquake, land subsidence, or the like occurs, the high sealing performance of the ball valve 1 and, consequently, the function of preventing seat leakage can be maintained.

In the above-described embodiment, the case where the main components (the body 5, the ball 7, the guide 9, the bonnet 10, and the cap 15) of the ball valve 1 are made of synthetic resin has been described. The material of the component parts is not limited to the synthetic resin, and other materials (for example, metal) can be adopted as the material of the main component parts of the ball valve 1.

In the above-described embodiment, the seat ring 6 including the nitrile rubber ring main body 61 and the tilt adjusting ring 62 has been described.
1. The material of the inclination adjusting ring 62 is not limited to nitrile rubber, and a seat ring 6 made of other materials may be employed.

Further, in the above embodiment, the case where the ball valve 1 is connected to the gas supply pipes 2 and 3 has been described.
The ball valve 1 can also be used by connecting it to a pipe other than the gas supply pipes 2 and 3 (for example, a water pipe).

[0019]

As described above, according to the first aspect of the present invention, the body 5 having the two ventilation pipes 5a and 5b is formed. In the ball valve 1 in which the ball 7 is rotatably mounted via the seat ring 6 in such a manner that the ventilation hole 7a thereof can communicate with each of the ventilation pipes 5a and 5b of the body 5 at the same time, The inclination adjustment ring 62 is attached to the ring main body 61, and the core CT2 is connected to the core C of the ring main body 61.
When the finish of the body 5 is slightly deviated from the design, the inclination adjusting ring 62 of each seat ring 6 is attached to the ring main body. Since it is possible to prevent a situation in which a gap is formed between the body 5 and each of the seat rings 6 by moving with respect to the body 61, the sealing property at the seat ring 6 portion of the ball valve 1 is enhanced to prevent seat leakage. It is possible to do.

Further, according to the second aspect of the present invention, the material of the main components of the ball valve 1 is made of synthetic resin, so that the weight of the ball valve 1 is reduced and the corrosion resistance is improved. can do.

Further, according to the third aspect of the present invention, since the hardness of the inclination adjusting ring 62 is made smaller than the hardness of the ring main body 61, the ring main body 6 is formed.
Since the tilt adjustment ring 62 is smoothly moved with respect to the ball valve 1, the seat leakage prevention function of the ball valve 1 can be maintained even when an earthquake, land subsidence, or the like occurs.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing one embodiment of a ball valve according to the present invention.

2A and 2B are views showing a seat ring of the ball valve shown in FIG. 1, wherein FIG. 2A is a front view, FIG. 2B is a horizontal sectional view showing a first use state, and FIG. It is a horizontal sectional view showing a use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Ball valve 5 ... Body 5a, 5b ... Ventilation line 6 ... Seat ring 7 ... Ball 7a ... Vent hole 61 ... Ring body 62 ... Tilt adjusting ring CT1 ... Core of ring body CT2: Core of tilt adjustment ring

Claims (3)

[Claims] 1. A body (5) in which two ventilation pipes (5a, 5b) are formed, and a ball (7) is inserted into the body through two seat rings (6). 7a) is a ball valve (1) rotatably mounted in such a manner that it can simultaneously communicate with each of the ventilation pipes of the body, wherein, as each of the seat rings, a tilt adjusting ring (62) is provided on a ring body (61). A ball valve characterized by using a core (CT2) movably engaged so as to be three-dimensionally inclined with respect to a core (CT1) of the ring main body. 2. The ball valve according to claim 1, wherein the material of the main components is a synthetic resin. 3. The ball valve according to claim 1, wherein the hardness of the inclination adjusting ring (62) is smaller than the hardness of the ring main body (61).