JPH0117744Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an on-off valve with an opening adjustment mechanism.

<Prior art> For example, when adjusting the flow rate in a ball valve, it is done by adjusting the rotation amount of the operating lever, but in conventional ball valves, a stopper is used to restrict the rotation of the operating lever at the fully closed or fully open position. Since only one valve is provided, it is difficult to adjust the opening with reproducibility, and once the valve is closed, the valve must be set to the same opening again to obtain the required flow rate. A difficult problem arose.

<Purpose of the invention> Therefore, the present invention aims to make it possible to adjust the opening degree of the valve at the open end or the closed end with an extremely simple configuration, and to make it possible to adjust the opening degree with reproducibility. This is the purpose.

<Structure of the device> The present invention provides a locking plate having an elongated hole into which the operating shaft engages and an engaging portion at one end that engages with the side surface of the valve body, which is attached to the operating shaft. The valve body is characterized in that the degree of opening at the open end or the closed end of the valve body is changed by changing the radial position of the engaging portion on the stop plate by moving the stop plate.

<Example> Hereinafter, an example of the present invention will be described based on the drawings. 1 to 3, reference numeral 10 denotes a valve body having a hexagonal cross section with pipe connection ports 11 and 12 formed at both ends, and a pair of pipe connection ports 11 and 12.
are in communication with a valve chamber 16 in which a spherical valve body 15 is disposed via communication passages 13 and 14, respectively.
The valve body 15 includes the pair of communication passages 1.
A passage 17 is formed to allow the parts 3 and 14 to communicate with each other. On the other hand, an operating shaft 18 is rotatably mounted on the valve body 10 and extends in a direction perpendicular to the axis of the passage 17 of the valve body 15 and perpendicular to one outer surface 10a of the valve body 10. , its inner end is the valve body 1
5 so that motion in the rotational direction is transmitted thereto, and the outer end protrudes from the outer surface 10a. An operating lever 19 and a locking plate 20 for regulating the opening are attached to the outer end of the operating shaft 18.

That is, the protrusion 21 from the outer surface 10a of the operating shaft 18 is chamfered on two sides to have an oval cross-sectional shape, and is formed with an external thread.
A seal washer 22, a flat washer 23, a locking plate 20, an operating lever 19, and a spring washer 25 are inserted in this order into this protruding portion 21, and are fixed by a bolt 26 screwed into the threaded portion.

As shown in FIG. 3, the mounting hole 19a of the operating lever 19 is formed in an oval shape corresponding to the cross-sectional shape of the protruding portion 21, and is adapted to rotate integrally with the operating shaft 18, and has a circular base. An engaging portion 19b that can be engaged with the outer surface 10b adjacent to the outer surface 10a of the valve body 10 is bent at the outer edge of the valve body 10, and the engagement portion 19b can be bent between the fully open state of the valve and the first state shown by the solid line in FIG.
In the fully closed state of the valve shown by the two-dot chain line in the figure,
The engaging portion 19b engages with the outer surface 10b to restrict rotation of the operating lever 19.

On the other hand, the locking plate 20 is formed in a rectangular shape, and has a long hole 2 slightly wider than the width of the protrusion 21 in the major diameter direction.
0a is formed in the longitudinal direction, and an engaging portion 20b of a predetermined width that can be engaged with the outer surface 10c adjacent to the outer surface 10a is bent at one end thereof.

In the ball valve configured as described above, when the valve opening degree is not adjusted, the end of the locking plate 20 on the side where the engaging portion 20b is not formed is connected to the operating lever 19 as shown in FIG. Adjust the position so that the bolt 26 is inside the engaging portion 19b, and then tighten the bolt 26. As a result, the engaging portion 20b of the locking plate 20 does not come into contact with the outer surface 10c before the engaging portion 19b of the operating lever 19 comes into contact with the outer surface 10b, and the valve can be used in a fully open or fully closed state. .

On the other hand, when adjusting the opening degree of the open end of the valve, as shown in FIGS. 4 and 5, the side surface of the end of the locking plate 20 on the side where the engaging portion 20b is not formed is pressed with the operating lever. The engaging portion 2 of the locking plate 20 is engaged with the side portion in the opening direction of the engaging portion 19b formed in the locking plate 19 and serving as a regulating means, and the engaging portion 2 of the locking plate 20 is
Adjust the distance to 0b as appropriate and continue tightening the bolt 26. As a result, in the process of operating the operating lever 19 in the opening direction, the operating lever 19
Before the engaging portion 19b of the locking plate 20 contacts the outer surface 10b, the engaging portion 20b of the locking plate 20 contacts the outer surface 10c, stopping the rotation of the operating lever 19 at an intermediate position. Thereby, the rotation of the valve body 15 is stopped midway, and the required opening degree is obtained. Note that FIG. 4 shows the position of the locking plate 20 when the valve opening is halved, and FIG. 5 shows the position of the locking plate 20 when the valve opening is 1/4.

In addition, when it is desired to adjust the opening degree of the closed end of the valve, as shown in FIG.
The end side surface on the side where 0b is not formed is the engaging part 1
What is necessary is just to make it engage with the side surface of 9b in the closing direction.

Further, as shown in FIG. 7, the engaging portion 20b on the locking plate 20 is
Even if the locking plate 20 is installed on the same side as the
The opening degree can be adjusted by adjusting the position of the locking plate 20.

Note that the width of the elongated hole 20a of the locking plate 20 is
As the width corresponding to the chamfer width in 1, the operating axis 1
8, the locking plate 20
It is not necessary to engage the engaging portion 19c of the operating lever 19 with the side surface of the operating lever 19.

In this case, the two-chamfered portion of the protrusion 21 that engages with the elongated hole 20a functions as a regulating means.

<Effects of the invention> As described above, in the present invention, a locking plate is provided on the operating shaft, which rotates integrally with the operating lever and whose position in the radial direction can be adjusted with respect to the operating shaft.
The engaging part formed on this locking plate engages with the outer surface of the valve body to regulate the rotation amount of the operating lever, so the opening degree can be adjusted at the open end or closed end with an extremely simple configuration. Not only can this be done, but it also has the advantage of being able to accurately reproduce the same opening degree even when the valve is repeatedly opened and closed.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a plan view of a ball valve, Fig. 2 is a partially sectional side view of the ball valve, and Fig. 3 is a sectional view taken along the line - in Fig. 2. 4 and 5 are diagrams showing the position of the locking plate 20 when adjusting the opening degree of the open end, and FIG. 6 is a diagram showing the position of the locking plate 20 when adjusting the opening degree of the closed end. 7 are plan views showing different attachment modes of the locking plate 20. FIG. 10... Valve body, 11, 12... Pipe connection port, 15... Valve body, 18... Operating shaft, 19... Operating lever, 19b... Engaging portion, 20... Locking plate,
20b...engaging portion, 26...bolt.

Claims (1)

[Scope of utility model registration request] An on-off valve in which an operating lever is attached to an operating shaft of a valve body protruding from a valve body, wherein an elongated hole is formed into which the operating shaft engages, and an engaging portion is formed at one end to engage with a side surface of the valve body. A locking plate is attached to the operating shaft, and the side surface of the end of the locking plate on the side where the engaging portion is not formed is engaged with the side in the opening direction of the engaging portion forming the regulating means formed on the operating lever. The opening degree at the open end or the closed end of the valve body is changed by moving the locking plate with respect to the operating shaft and changing the radial position of the engaging portion. An on-off valve with an opening adjustment mechanism.