JPS6240223Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a ball valve for controlling fluid flow.

Prior Art A conventional ball valve has a linear through hole 6 formed in a spherical valve body 5, and the two passages 2 and 3 are opened and closed by rotating the valve body 5 by 1/4 turn. The position of the through hole 6 when closed, and especially the position when opened, is important. If the center of the through hole 6 and the opening of the main body 1 are not aligned sufficiently, the resistance of fluid flow will increase and the characteristics of the ball valve will be affected. It's something to lose.

As shown in the specification and drawings of Japanese Utility Model Application Publication No. 57-85164 (see Fig. 4), a conventional ball valve is positioned by drilling a through hole 15 in a direction perpendicular to the axis of the valve stem 7. A pin 12 is driven into the main body 1, and a 1/4 circumference annular projection 18 formed by forging at the time of manufacturing the main body is provided on the main body 1 side, and the pin 12 is placed against the side wall of the projection 18 for positioning.

However, in this method, since the pin 12 part and the protrusion 18 are provided on the outer upper part of the threaded part 9 for tightening the valve cover 8, the valve rod 7 is
In addition, since the valve cover 8 must be made longer, the height of the valve becomes larger and the valve becomes larger. In addition, when driving the pin 12, it is necessary to assemble the pin 12 so that it stops at exactly the halfway position, and if there is a problem with driving the pin 12, there is a risk of damaging the threaded part or the seal part of the valve cover 8. .

Purpose The present invention aims to solve the above problems and provide a ball valve that is extremely easy to assemble and can reduce the height of the valve.

Configuration The present invention includes a spherical valve body that communicates the openings at both ends of the main body with two passages, forms a valve chamber inside, is housed in the valve chamber, and has a linear through hole bored inside. Rotate 1/4 turn with the valve stem that passed through the main body,
In the ball valve that opens and closes the two passages, two annular grooves with a diameter of 1/4 of the circumference larger than the valve stem hole are formed in the threaded part on the outer periphery of the upper part of the main body that is screwed into the valve cover, with the center of the valve stem hole. One of the annular grooves is cut out to the outer periphery with a width slightly larger than the diameter of the pin for stopping rotation of the valve stem, and the length of the pin is slightly larger than the diameter of the annular groove. By making the pin shorter and making the distance from the center of the wall of the annular groove facing the opposite side of the notch half the length of the pin, it is possible to insert the pin into the valve stem from the notch side. It is characterized by automatic positioning at the half position and by the ability to reduce the height of the valve.

Embodiment The present invention will be described in detail below based on an embodiment shown in FIGS. 1, 2, and 3.

In the figure, 1 is the main body of the ball valve, the main body 1 is open at both ends, two passages 2 and 3 are communicated with each opening, and a valve chamber 4 is formed inside the main body 1. A spherical valve body 5 is housed inside the valve chamber 4, and a straight through hole 6 is bored therein parallel to the passages 2 and 3, and the valve body 5 passes through the main body 1 and rotates. 1/ by means of a movably pivoted valve stem 7.
It is rotated four times, and the two passages 2 and 3 are opened and closed by the through hole 6.

A threaded portion 9 that is screwed into the valve cover 8 is screwed on the upper outer periphery of the main body 1, and a valve with a diameter larger than the valve stem hole 10 is provided between the threaded portion 9 and the valve stem hole 10. Bar 7
Two annular grooves 11, 11 with a circumference of 1/4 having approximately the same depth as the diameter of the rotation stopper pin 12 are inserted into the valve stem hole 1.
The annular groove 11 is bored at a symmetrical position with respect to the center.
One of them has a notch 13 with a width slightly larger than the diameter of a pin 12 for stopping rotation of the valve stem 7 up to the threaded part 9 on the outer periphery, and the length of the pin 12 is slightly shorter than the diameter of the annular groove 11. Partial wall surface 14 of the annular groove 11 facing the notch 13 on the opposite side to the notch 13
The distance from the center of the pin is half the length of the pin 12.

Then, when the pin 12 is driven from the notch into the through hole 15 bored perpendicularly to the axis of the valve stem 7,
The pin 12 comes into contact with a part of the wall surface 14 of the annular groove 11 facing the opposite side of the notch 13 and stops there.
now stops at exactly half of the valve stem 7,
It is easy to assemble.

In addition, in order to open and close the two passages 2 and 3 by rotating the valve stem 7, the pin 12 is rotated 1/4 turn at right angles to the line connecting the two passages 2 and 3 as shown in FIG. When the pin 12 is brought into contact with the side wall of the annular groove 11, the two passages 2 and 3 communicate with each other as shown in Fig. The two passages 2 and 3 are closed so that the centers of the passages 2 and 3 coincide with the center of the through hole 6, and the two passages 2 and 3 communicate with each other without any resistance to fluid flow. The structure is such that the two passages 2 and 3 are completely closed when the two passages 2 and 3 are rotated 1/4 turn in parallel to the line connecting the two passages 2 and 3.

In addition, in FIG. 1, 16 indicates the main body 1 and the valve body 5.
A valve seat 17 is screwed onto the main body 1 to press the valve seat 16 against the valve body 5, and
This is a nut that connects the passage 2 to the main body 1.

Effects As mentioned above, in this invention, the pin part that restricts the rotation of the valve body is provided inside the threaded part for tightening the valve cover, so the valve stem and valve cover can be shortened, and the height of the ball valve can be lowered. This allows the two passages to communicate with each other without any resistance to fluid flow.

Also, if you drive the pin from the notch in the annular groove until it touches a part of the wall of the annular groove on the opposite side, the pin will be exactly in the center of the valve stem, and the pin will not protrude from the threaded part of the main body. It is an excellent ball valve in practical use, as it does not damage the screws on the valve cover and is easy to assemble.

[Brief explanation of the drawing]

1, 2, and 3 show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a top view,
FIG. 3 is a perspective view illustrating the main parts, and FIG. 4 is a perspective view illustrating the main parts of a conventional example. 1...Main body, 2...Aisle, 3...Aisle, 4...
Valve chamber, 5... valve body, 6... through hole, 7... valve stem,
8...Valve cover, 9...Threaded part, 10...Valve stem hole, 1
1... annular groove, 12... pin, 13... notch,
14...Partial wall surface, 15...Through hole, 16...Valve seal, 17...Nut, 18...Protrusion.

Claims (1)

[Scope of utility model registration request] A spherical valve in which openings at both ends of a main body 1 communicate with two passages 2 and 3, a valve chamber 4 is formed inside, the valve chamber 4 is housed, and a linear through hole 6 is bored inside. In a ball valve that opens and closes the two passages 2 and 3 by rotating the body 5 by 1/4 turn with a valve stem 7 passing through the body 1, a valve lid 8 on the outer periphery of the upper part of the body 1 is used.
1/4 of the diameter larger than the valve stem hole 10 on the threaded part 9 that is screwed into the valve stem hole 10.
Two circumferential annular grooves 11, 11 are bored at symmetrical positions with respect to the center of the valve stem hole 10, and one of the annular grooves 11 is formed at a diameter slightly larger than the diameter of the pin 12 for stopping rotation of the valve stem 7. Notch 13 with a large width to the outer periphery, the pin 1
The length of the annular groove 11 is slightly shorter than the outer diameter of the annular groove 11, and the annular groove 11 faces the opposite side of the notch 13.
The distance from the center of the wall surface 14 to the pin 12
A ball valve characterized by being half the length of.