JPH0355707B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ball valve that is provided with a stopper mechanism to ensure reliable opening and closing rotation within an angular range of 90 degrees.

The stopper mechanism of a conventional ball valve is such that the stopper part of the lever handle is brought into contact with a part of the outside of the body or a protrusion (or recess) provided on the outer circumferential surface of the body, so that the rotation angle of the handle is approximately 90 degrees. I am trying to stop it at a certain point.

The above conventional example will be explained in detail with reference to FIGS. 1 and 2. A stem 4 is attached to a ball 3 having a through hole 2 in a body 1, and a lever handle 5 is fixed to the upper part of the stem 4. , the handle 5 is fixed so that the stopper part 6 provided on the handle 5 is engaged with a protrusion 7 formed on the body 1.
In the figure, 8 is an insert screwed into the body 1 to hold one ball seat 9, and 10 is a gasket. However, according to this conventional example, since the stopper part 6 is formed on the lever handle 5 and the protrusion part 7 is provided on the outer periphery of the body 1, there is a drawback that the external shape and structure of the valve are complicated accordingly. .

Furthermore, since the lever handle 5 is generally made by pressing, and the body 1 is often made by forging or casting, dimensional errors are likely to occur, making it difficult to stop the handle 5 at an accurate position. The opening/closing position of the valve will be inaccurate, and since the stopper mechanism is exposed on the outer periphery of the valve, if a foreign object gets caught in the engaging surface of the stopper mechanism, the locking position of the stopper mechanism will shift and the valve will close. There is a drawback that the opening/closing position is inaccurate.

Moreover, the conventional connecting portion between the lever handle 5 and the stem 4 is prone to play, and when play occurs, the opening/closing position of the valve becomes inaccurate. Furthermore, as shown in FIGS. 1 and 2, the lever handle 5 is structured to also serve as a stopper, so it is impossible to remove the lever handle 5 from the valve.

The present invention was developed in order to eliminate the conventional problems, and its purpose is to simplify the external shape of the lever handle, etc. by providing a stopper mechanism inside the valve, and to machine the stopper mechanism parts. In addition to improving dimensional accuracy by using parts that are made of aluminum, the stopper mechanism is installed inside the valve and the stopper mechanism is installed outside to prevent foreign objects from getting caught and ensure that the opening and closing positions of the valve are always accurate. Furthermore, the stopper mechanism is completely unaffected by looseness at the connection between the stem and lever handle, and can also be applied to valves that remove the handle, so that it can be used without using a specific lever handle. The present invention aims to provide a ball valve that can also be applied to valves that can use a wrench or the like.

The structure of the ball valve according to the present invention to achieve the above object is such that a ball having a through hole is rotatably provided inside a body having openings on both sides, and the ball is screwed into the body from one or both of the openings. holding one or both of the ball seats for sealing contact with the surface of the ball with the insert, and extending an annular portion at one end of the insert in the screwing direction;
Furthermore, a cutout surface that slides and rotates in a 90 degree angle range with the end surface of the annular portion is formed on a portion of the stem attached to the ball that is located inside the body, and a cutout surface is formed at both ends of the cutout surface. In this example, locking surfaces are continuously formed to lock the end surfaces of the annular portion at both positions where the stem rotates within an angular range of 90 degrees.

An embodiment of the present invention will be described in detail below with reference to the drawings. Fig. 3 is a longitudinal cross-sectional view of the ball valve according to the present invention, Fig. 4 is a cross-sectional view taken along line B-B, where the connecting portion of the handle and stem in Fig. 3 is cut, and Fig. 5 is an enlarged view of part a in Fig. 3. , FIGS. 6 and 7 are cross-sectional views taken along the line C-C in FIG. 5 showing a state in which the stem and the insert are in contact with each other. A ball having a rotatable through hole 13, 14 a ball seat for sealing the ball surface, 15 a ball seat 1
Body 1 to hold one (or both) of 4
1, a generally ring-shaped insert screwed into the opening 22; 16, a stem whose lower end is attached to the ball 12; 17, a lever handle fixed to the upper end of the stem 16 via a buckle 18 with a nut 20; Reference numeral 19 indicates a flange portion formed in the middle of the stem 16 to prevent it from popping out, and 21 and 22 indicate openings formed at both ends of the body 11. Insert 1 mentioned above
5 is a stepped portion 2 for mounting the ball seat 14;
3 is formed, and an annular part 24 is formed at the end of the stepped part 23 in the insert screwing direction, while a collar part 19 formed in the middle of the stem 16 has an angle range of 90 degrees with the end surface of the annular part 24. A notched surface 25 is formed which rotates in sliding contact with the stem 16 at both ends of this notched surface 25.
Locking surfaces 26 and 27 are formed continuously, with which the end surface of the annular portion 24 is locked each time the annular portion 24 rotates.

The cutout surface 25 formed on the flange 19 and the cutout portions of the locking surfaces 26 and 27 connected thereto are the same as the flange 19.
9, the upper side of the notch is the locking part 28 of the insert 15, and when the annular part 24 of the insert 15 enters the notch, the end surface is in contact with the notch, and Annular part 24
The above-mentioned locking portion 28 is supported on the upper surface of the holder.

The force that pushes the stem outward is received by the collar 19, but the force that pushes the stem inward of the valve is conventionally received by the gasket 10 as shown in FIG. Since it is, Patsukin 10
If the stem 4 is pushed down after it is worn out, the ball 3 will be pushed, which will adversely affect the sealing function of the valve.

However, in this embodiment, the annular portion 2 of the insert 15 is inserted into the cutout portion of the stem 16 as described above.
4 enters and the seal 18 receives the downward force of the worn stem 16, so it does not push the ball 12 and does not affect the sealing function of the valve.

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

As shown in FIG. 3, the insert 15 is screwed into the opening 22 of the body 11, and the distance between one step in the body 11 and the insert 15 is controlled by opening/closing the valve and controlling the fluid flowing inside the valve. When the end face of the annular portion 24 of the insert 15 is set to a distance that allows sealing and the end surface of the annular portion 24 of the insert 15 is brought into contact with the locking surface 27 formed on the flange portion 19 of the stem 16, as shown in FIGS. 16 is prevented from rotating counterclockwise in the state shown in FIG. 6, keeping the valve open as shown in FIG.

Next, when the stem 16 is rotated in the clockwise direction in FIG.
A locking surface 26 formed in connection with the stem 16 is locked to the end face of the annular portion 25, and the stem 16 is reliably prevented from rotating in a 90 degree rotated state, thereby keeping the flow path of the valve in a closed state.

Further, the annular portion 24 of the insert 15 is connected to the collar portion 19.
Since the ball 12 is inserted under the valve and supports the downward force of the stem 16, it does not push the ball 12 and does not adversely affect the sealing function of the valve.

In the above example, the insert 15 is screwed in from the opening 22, but it is also possible to screw the insert in from both the openings 22 and 23, and to form a ball sheet using the stepped portions provided on the two inserts. 1
4 and 14, in which case one of the two inserts is formed with an annular portion as described above.

Although the embodiments have been described above, the present invention forms a notch surface that slides and rotates in a 90 degree angle range with the end surface of the annular portion in a part of the stem located in the body, and at both ends of the notch surface. By continuously forming a locking surface that locks the end face of the annular portion every time the stem rotates 90 degrees, the stopper mechanism is installed inside the valve body without the need for a new stopper component, resulting in the following excellent effects. has.

(1) Since the stopper mechanism is installed inside the valve,
Since the external shape of the valve can be simplified and the stopper mechanism is not exposed to the outside, there is no possibility of incorrect opening/closing position of the valve due to foreign matter getting caught.

(2) Since the stopper mechanism parts are machined parts, their dimensional accuracy is high, and the opening and closing positions of the valves are extremely accurate compared to conventional valves.

(3) The play between the stem and the lever handle is completely unrelated to the stopper mechanism, and there is no possibility of problems caused by play at the connection between the two as in the past.

(4) Even if the lever handle is removed, the stopper mechanism remains, so the valve can be made into a type where the handle is removed, or it can be made into a valve that can be used with a spanner, etc., without using a specific lever handle. , extremely versatile.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing a conventional example of a ball valve, Fig. 2 is a partial sectional view taken along line A-A in Fig. 1, and Figs. 3 to 7 are an embodiment of the present invention. 3 is a longitudinal sectional view of the ball valve according to the present invention, FIG. 4 is a partial sectional view taken along line B-B in FIG. 3, and FIG. 5 is a section a in FIG. 3. Enlarged view,
6 and 7 are cross-sectional views taken along the line CC in FIG. 5, showing a state in which the stem and the insert are partially in contact with each other. 11... Body, 12... Ball, 13... Through hole, 14... Ball seat, 15... Insert, 16... Stem, 19... Flange, 21, 22
...Opening part, 23...Step part, 24...Annular part, 2
5... Notch surface, 26, 27... Locking surface, 28...
Engagement part.

Claims (1)

[Claims] 1. A ball having a through hole is rotatably provided inside a body having openings on both sides, and an insert screwed through one or both of the openings is used to bring the surface of the ball into sealing contact with one or both of the ball seats. An annular portion is extended to one end of the insert in the screwing direction, and the end surface of the annular portion is attached to a part of the stem attached to the ball that is located inside the body. A cutout surface is formed that slides and rotates in an angular range of 90 degrees, and at both ends of the cutout surface, the end surfaces of the annular portion are engaged at both positions where the stem rotates in an angular range of 90 degrees. A ball valve characterized by continuous stop surfaces.