JPH1151211A - Ball valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate replacement of a part such as a seat ring and a ball plug by forming a plug entrance, through which a seat ring and a ball plug can be freely put in/out, in a valve casing and mounting an openable lid, which is brought into contact with the ball plug, freely removably. SOLUTION: In a valve casing 1 in which an inflow port 2 and an outflow port 3 are opened in asymmetric positions while making an angle of about 90 degrees with each other, a plug entrance 11, whose bore diameter allows a seat ring 5 and a ball plug 7 to be put in/out, is opened in the opposed position to the outflow port 3. In the valve casing 1, the seat ring 5 is inserted toward the outflow port 3 from the plug entrance 11, and on the seat ring 5, the ball plug 7 is placed, while a valve shaft 9 is fitted in a shaft fitting hole 7a of the ball plug 7. Subsequently, an openable lid 12 is screwed to the plug entrance 11, while a contact part 6 in the inside end of the openable lid 12 is brought into contact with the ball plug 7 through the opposite side to the seat ring 5, and then, the ball plug 7 is held in the predetermined position by means of the seat ring 5 and the contact part 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 a pipe for opening and closing a fluid passage and adjusting a flow rate of a fluid.

[0002]

2. Description of the Related Art FIG. 9 is a longitudinal sectional view showing a conventional ball valve. In the drawing, reference numeral 1 denotes a valve casing, and the valve casing 1 has a valve housing body 1 having a fluid outlet 3.
A and a valve housing lid 1B having a fluid inlet 2 are formed separately, and the valve housing main body 1A and the valve housing lid 1B are fastened to each other with bolts and nuts 4 so that they can be disassembled. Have been.

[0003] Reference numeral 5 denotes a first seat ring fitted in the valve housing body 1A, and 6 denotes a second seat ring fitted in the valve housing lid 1B.
Is a ball plug. The ball plug 7 has a valve hole 8 and is slidably mounted on the first and second seat rings 5 and 6.

Reference numeral 9 denotes a valve shaft. The valve shaft 9 penetrates the valve housing body 1A via a seal member 10 and is detachably connected to the ball plug 7. The valve shaft 9 is linked to an operation actuator (not shown).

[0005] The inflow port 2 and the outflow port 3 are open to face each other. A primary pipe (not shown) is provided at the inflow port 2 and a secondary pipe is provided at the outflow port 3. (Not shown) are connected to each other, and the ball plug 7 has a valve opening position where the valve hole 8 linearly connects the inflow port 2 and the outflow port 3 with the valve shaft 9 as the center of rotation. It is configured to be rotationally displaced to a valve closing position for shutting off between the inflow port 2 and the outflow port 3.

[0006] The ball valve configured as described above
When the seat rings 5 and 6 and the ball plug 7 are worn, it is necessary to replace them. Upon the exchange,
First, the pipes connected to the inflow port 2 and the outflow port 3 are cut or removed in the middle, and then the bolts and nuts 4 that fasten the valve housing body 1A and the valve housing lid 1B are removed. The seat ring 6 in the valve housing 1B is replaced. Also, the seat ring 5 and the ball plug 7 on the valve housing body 1A side.
In the case of replacing also, the valve shaft 9 is removed, and then the ball plug 7 and the seat ring 5 are replaced. After the replacement, the ball valve is reassembled, and the pipes are connected again.

[0007]

Since the conventional ball valve is constructed as described above, the inlet 2 and the outlet 3
It is impossible to replace parts such as the seat rings 5 and 6 and the ball plug 7 while the pipes are still connected. Even when only the seat ring 5 on the inflow port 2 side is replaced, After cutting or removing the pipe connected to the inflow port 2, the bolts and nuts 4 must be removed, and when replacing the ball plug 7 or the seat ring 5 on the outflow port 3 side, the bolt It can be replaced by removing the valve shaft 9 after removing the nut 4, but even after such replacement of parts, many parts replacement is required, such as reassembly of the ball valve and reconnection of piping. There was a problem that the workability was extremely poor due to the time and labor required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can easily replace parts such as a seat ring and a ball plug without cutting or removing a connecting pipe. The purpose is to obtain a valve. Another object of the present invention is to provide a ball valve that does not complicate the valve structure for facilitating component replacement. Further, the present invention can prevent a fluid from leaking by preventing a gap from being formed between the seat ring and the ball plug due to abrasion, deterioration and the like of the seat ring. The purpose is to obtain a valve. Another object of the present invention is to provide a ball valve capable of easily removing even if dust is caught between a seat ring and a ball plug.

[0009]

According to a first aspect of the present invention, there is provided a ball valve having a fluid inlet and a fluid outlet, a valve casing forming a flow path connecting them, and a seat in the valve casing. A ball plug provided through a ring, and having a ball plug having a valve hole capable of communicating with a primary flow path on the inlet side and a secondary flow path on the outlet side, A plug port is provided in the valve casing and through which the seat ring and the ball plug can enter and exit, and an opening / closing lid detachably attached to the plug port and abutting on the ball plug.

In the ball valve according to the second aspect of the present invention, the inlet and outlet of the valve casing are open at non-facing positions, and a plug outlet is provided at a position facing the inlet or outlet. An opening / closing lid is detachably attached to the entrance.

According to a third aspect of the present invention, there is provided a ball valve, wherein the opening / closing lid is brought into contact with the ball plug at the time of attachment to the plug inlet / outlet, and the contact portion is moved in the direction of contact with the ball plug. And pressing means for pressing.

According to a fourth aspect of the present invention, in the ball valve, the pressing means is attached to an elastic body interposed between the opening / closing lid and the abutting portion or to the opening / closing lid so that the abutting portion is connected to the ball plug. In the contact direction.

According to a fifth aspect of the present invention, the pressing means has a pressing member disposed between the opening / closing lid and the contact portion, and a pressing member interposed between the pressing member and the contact portion. And a tightening means attached to the opening / closing lid to fasten the holding member against the elastic body.

According to a sixth aspect of the present invention, the contact portion comprises an annular member having a valve seat for rotatably sliding the ball plug.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a vertical sectional view showing a ball valve according to Embodiment 1 of the present invention, and the same or corresponding parts as those in FIG. FIG.
In the figure, reference numeral 1 denotes an integral valve casing having an inlet 2 and an outlet 3 for a fluid, and the inlet 2 and the outlet 3 of the valve casing 1 are opened at a non-face-to-face position at a substantially 90 degree angle. ing.

Reference numeral 11 denotes a plug inlet / outlet provided in the valve casing 1. The plug inlet / outlet 11 is opened at a position facing the outlet 3, and has a diameter which allows the seat ring 5 and the ball plug 7 to enter and exit. I have.

A seat ring 5 is inserted into the valve casing 1 from the plug inlet / outlet 11 to the outlet 3 side, and is detachably attached. A ball plug 7 is placed on the seat ring 5. . The ball plug 7 is provided with a square hole-shaped shaft fitting hole 7a.
The valve shaft 9 is detachably fitted to and connected to the inflow port 2 at a position facing the inflow port 2.

Reference numeral 8 denotes a large-diameter valve hole provided in the ball plug 7. The large-diameter valve hole 8 is formed to be bent at an angle of about 90 degrees so that the inflow port 2 and the outflow port 3 can communicate with each other. ing. 8a is a primary opening of the large-diameter valve hole 8, 8b is a secondary opening of the large-diameter valve hole 8, 8c is a small-diameter valve hole provided in the ball plug 7, and the small-diameter valve hole 8c is It communicates with the large diameter valve hole 8.

The ball plug 7 having such a large-diameter valve hole 8 and a small-diameter valve hole 8c is provided with a primary opening 8a of the large-diameter valve hole 8.
Communicates with the inflow port 2 and the secondary opening 8b communicates with the outflow port 3, and the primary opening 8a communicates with the inflow port 2 and the small-diameter valve hole 8c communicates with the outflow port 3. A throttle position where the flow rate of the fluid flowing into the primary opening 8a of the large-diameter valve hole 8 from the inflow port 2 is throttled by the small-diameter valve hole 8c and the fluid flows out from the small-diameter valve hole 8c to the outflow port 3; The rotation is controlled to a fully closed position where the valve 2 and the outlet 3 are completely shut off.

The large-diameter valve hole 8 is provided on the side of the inflow port 2 side.
The secondary opening 8a may have the largest diameter and the secondary opening 8b on the outlet 3 side may have a smaller diameter. In this case, the small-diameter valve hole 8c has a smaller diameter than the secondary opening 8b. The primary opening 8a, the secondary opening 8b, and the small-diameter valve hole 8c of the large-diameter valve hole 8 are formed in the shape of the inlet 2
The design can be changed to various shapes so that the flow rate characteristics of the fluid flowing from the outlet to the outlet 3 are different.

Reference numeral 12 denotes an opening / closing lid detachably screwed to the plug inlet / outlet 11. The opening / closing lid 12 has an abutting portion 6 for the ball plug 7, and the abutting portion 6
An annular member (sheet ring) made of a soft material such as synthetic resin, synthetic rubber, Teflon, or graphite is detachably fitted to the inner end of the opening / closing lid 12.

Therefore, the plug port 1 of the valve casing 1
When the opening / closing lid 12 is screwed into the opening 1, the contact portion 6 at the inner end of the opening / closing lid 12 abuts on the ball plug 7 on the opposite side of the seat ring 5, so that the ball plug 7 comes into contact with the seat ring 5. The rotation is controlled while being held at a predetermined position by the contact portion 6.

Reference numeral 13 denotes an actuator in which the valve shaft 9 is linked, and the rotation of the ball plug 7 is controlled by the actuator 13.

Next, the operation will be briefly described. The ball valve configured as described above is provided with a primary pipe connected to the inlet 2 of the valve casing 1 and a secondary pipe connected to the outlet 3 for use in the actuator 1.
3, the primary opening 8a of the large-diameter valve hole 8 communicates with the inlet 2 and the secondary opening 8b communicates with the outlet 3, and the ball is opened from the valve fully open position. By controlling the rotation of the plug 7 by 180 °,
Different flow characteristics can be obtained at the throttle position where the primary opening 8a of the large diameter valve hole 8 communicates with the inlet 2 and the small diameter valve hole 8c communicates with the outlet 3. Therefore, it is not necessary to replace the ball plug 7 with one having a different flow path structure in order to obtain different flow characteristics.

Next, a case where the seat ring 5 and the ball plug 7 are replaced will be described. In this case, if the valve shaft 9 is removed from the ball plug 7 and the opening / closing lid 12 is removed, the plug port 11 is opened.
, The ball plug 7 and the seat ring 5 may be sequentially taken out and replaced with a new one.

Accordingly, replacement of the ball plug 7 and the seat ring 5 can be performed easily and finely without cutting or removing the pipes connected to the inflow port 2 and the outflow port 3 of the valve casing 1. The contact portion 6 removed together with the opening / closing lid 12 can be easily replaced as needed.

In short, in the first embodiment, the inflow port 2 and the outflow port 3 of the valve casing 1 are opened at a non-facing position at an angle of about 90 degrees, and the plug port 1 is located at a position facing the outflow port 3.
1 and the open / close lid 12 is detachably attached to the plug inlet / outlet 11, but the parts can be easily and conveniently replaced as described above. Further, by providing the ball plug 7 with the large-diameter valve hole 8 and the small-diameter valve hole 8c having a substantially 90-degree angle, different flow characteristics can be obtained.

Embodiment 2 FIG. 2 is a cross-sectional view showing a ball valve according to Embodiment 2 of the present invention. In the same figure, reference numeral 14 denotes a covered cylindrical movable member slidably fitted in a tubular wall portion 12a of an opening / closing lid 12. And this movable member 1
An abutting portion 6 made of a soft annular member is detachably provided at a lower end of 4. 15 is an opening / closing lid 12 and a movable member 14
The elastic member 15 is a pressing member for pressing the contact portion 6 via the movable member 14 in the contact direction with the ball plug 7. It is a means.

That is, in the second embodiment, the opening / closing lid 12
The elastic member 15 is used as a means for elastically pressing the contact portion 6 against the ball plug 7 when it is screwed into the plug port 11.
The contact portion 6 is always elastically pressed by the elastic body 15 against the ball plug 7, so that the seat ring 5 and the contact portion 6 may be worn or deteriorated due to wear and the like. It is possible to prevent a gap from being generated between the seat ring 5 or the abutting portion 6 and the ball plug 7, thereby preventing fluid leakage and obtaining the same effect as that of the first embodiment.

Embodiment 3 FIG. 3 is a sectional view showing a ball valve according to Embodiment 3 of the present invention. In the third embodiment, a fastening screw (fastening means) 16 instead of the elastic body 15 of the second embodiment is used as a pressing means of the contact portion 6.
Is screwed through the central portion of the opening / closing lid 12. According to the third embodiment, the contact portion 6 with the tightening screw 16 is used.
When the pressing force on the ball plug 7 is weakened, the pressing force can be increased by the tightening screw 16, so that the same effect as in the case of the second embodiment can be obtained.
When the ball plug 7 has caught foreign matter such as dust between the seat plug 5 and the abutting portion 6, the fastening screw 1
By loosening 6, the biting foreign matter can be removed.

Embodiment 4 FIG. FIG. 4 is a partial sectional view showing a main part of a ball valve according to Embodiment 4 of the present invention. In the figure, reference numeral 17 denotes a cylindrical wall portion 12a of the opening / closing lid 12.
The holding member 17 is slidably fitted in the holding member 17, and the holding member 17 is disposed between the opening / closing lid 12 and the movable member 14. That is, in the fourth embodiment, as the pressing means of the contact portion 6, the elastic member 15 is provided between the movable member 14 and the pressing member 17 slidably fitted in the cylindrical wall portion 12a of the opening / closing lid 12.
And a fastening screw (fastening means) 16 is screwed through the center of the opening / closing lid 12.

According to the fourth embodiment, the tightening screw 16
The elastic force of the elastic body 15 can be adjusted by adjusting the pressing force of the pressing member 17 by the force, so that the pressing force of the contact portion 6 against the ball plug 7 can be appropriately adjusted. Therefore, a similar effect can be obtained in the fourth embodiment.

Embodiment 5 FIG. FIG. 5 is a longitudinal sectional view showing a ball valve according to Embodiment 5 of the present invention, and FIG. 6 is a sectional view taken along line AA of FIG. In the figure, 7b is a shaft fitting hole formed of a circular hole provided at a position symmetrical to the square hole-shaped shaft fitting hole 7a in the ball plug 7, and 18 is the valve casing 1.
A detachable trunnion shaft which is threaded through the wall of the trunnion shaft and protrudes in the direction opposite to the valve shaft 9.
Is fitted into the shaft fitting hole 7b of the ball plug 7 to rotatably support the ball plug 7.

That is, in the fifth embodiment, the opening direction of the inflow port 2 and the outflow port 3 of the valve casing 1 and the direction of the valve hole 8 of the ball plug 7 are changed, and the ball plug 7 is placed opposite to the valve shaft 9. The structure is a so-called trunnion type ball valve which is rotatably supported by a trunnion shaft 18 on the side. The other components are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals. Description is omitted.

Therefore, in the case of the fifth embodiment, when replacing the parts, the valve shaft 9 and the trunnion shaft 18 are removed and the opening / closing lid 12 is opened, so that the ball plug 7 and the seat ring 5 in the valve casing 1 can be taken out. Thus, the same effect as in the first embodiment can be obtained.

Embodiment 6 FIG. FIG. 7 is a longitudinal sectional view showing a ball valve according to Embodiment 6 of the present invention, and FIG. 8 is a sectional view taken along line BB of FIG. The sixth embodiment is a modification of the ball valve of FIG. 3 according to the third embodiment,
The difference between the two is that the inlet 2 of the valve casing 1 and the outlet 3
3 and the direction of the valve hole 8 of the ball plug 7 are changed, and the other configuration is the same as that of FIG. Therefore, in the case of the sixth embodiment, the same effect as that of the third embodiment can be obtained.

[0037]

As described above, according to the first aspect of the present invention, the valve casing is provided with the plug entrance and exit through which the seat ring and the ball plug can enter and exit, and the opening / closing lid is detachably attached to the plug entrance and exit. Therefore, when replacing parts such as seat rings and ball plugs, it is easy to replace parts simply by opening the opening / closing lid without cutting or removing the piping connected to the inlet and outlet of the valve casing. This has the effect of being able to perform the operation swiftly, improving workability, and facilitating maintenance such as parts inspection. Also, since the opening / closing lid is configured to contact the ball plug when attached to the plug entrance,
There is an effect that the ball plug can be held at a predetermined position close to the seat ring.

According to the second aspect of the present invention, the inlet and outlet of the valve casing are opened at non-facing positions, and a plug outlet is provided at a position facing the inlet or outlet, and the plug outlet is opened and closed. Since the lid was detachably attached,
The structure is simple, the flow rate of the fluid can be smoothly and smoothly controlled, and there is an effect that the valve structure does not become complicated for facilitating replacement of parts.

According to the third aspect of the present invention, when the opening / closing lid is attached to the plug entrance / exit, the contact portion provided on the opening / closing lid comes into contact with the ball plug, and the contacting portion moves in the direction of contact with the ball plug. Since the structure is pressed by the pressing means, even if a gap is created between the seat ring and the ball plug due to abrasion, deterioration and deformation of the seat ring, etc., this is prevented and fluid leakage is prevented. There is an effect that can be.

According to the fourth aspect of the present invention, the pressing means is attached to the elastic body interposed between the opening / closing lid and the abutting portion or to the opening / closing lid so that the abutting portion contacts the ball plug. Since it is composed of fastening means for tightening in the contact direction, when foreign matter such as dust is caught between the seat ring and the ball plug, the pressing force of the abutting part by the fastening means or the pressing force by an elastic body By weakening the pressing force of the contact portion, the above-mentioned biting foreign matter can be easily removed, and
The same effect as the third aspect of the invention can be obtained.

According to the fifth aspect of the present invention, a pressing member disposed between the opening / closing lid and the contact portion, an elastic body interposed between the pressing member and the contact portion, Since the pressing means is constituted by the fastening means which is attached to the lid and fastens the pressing member against the elastic body, the same effect as the invention according to claim 4 can be obtained.

According to the sixth aspect of the present invention, since the contact portion is constituted by the annular member for slidingly contacting the ball plug, the contact portion maintains the liquid tightness with the ball plug. However, there is an effect that the rotation control of the ball plug can be performed without any trouble.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a ball valve according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view showing a ball valve according to Embodiment 2 of the present invention.

FIG. 3 is a longitudinal sectional view showing a ball valve according to Embodiment 3 of the present invention.

FIG. 4 is a longitudinal sectional view showing a ball valve according to Embodiment 4 of the present invention.

FIG. 5 is a longitudinal sectional view showing a ball valve according to Embodiment 5 of the present invention.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a longitudinal sectional view showing a ball valve according to Embodiment 6 of the present invention.

FIG. 8 is a sectional view taken along line BB of FIG. 7;

FIG. 9 is a longitudinal sectional view showing a conventional ball valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve casing 2 Inflow port 3 Outflow port 5 Seat ring 6 Contact part 7 Ball plug 11 Plug port 12 Opening / closing lid 15 Elastic body (pressing means) 16 Tightening screw (tightening means) 17 Pressing member

Claims (6)

[Claims] A valve casing having a fluid inlet and a fluid outlet and forming a flow path connecting them; a valve casing provided in the valve casing via a seat ring; In a ball valve provided with a side flow passage and a ball plug having a valve hole capable of communicating with a secondary flow passage on the outlet side, the seat ring and the ball plug are provided in the valve casing so that the seat ring and the ball plug can enter and exit. A ball valve comprising: a plug inlet / outlet; and an opening / closing lid detachably attached to the plug outlet and in contact with the ball plug. 2. An inflow port and an outflow port of a valve casing are opened at a non-facing position, a plug port is provided at a position facing the inflow port or the outflow port, and an opening / closing lid is detachably attached to the plug port. The ball valve according to claim 1, wherein 3. The opening / closing lid includes a contact portion that is brought into contact with the ball plug at the time of attachment to the plug port, and pressing means that presses this contact portion in the direction of contact with the ball plug. The ball valve according to claim 1 or 2, wherein: 4. The pressing means may be an elastic body interposed between the opening / closing lid and the abutting part or a fastening means attached to the opening / closing lid and tightening the abutting part in the direction of abutting against the ball plug. 4. The ball valve according to claim 3, wherein the ball valve is formed. 5. The pressing means includes: a pressing member disposed between the opening / closing lid and the contact portion; an elastic body interposed between the pressing member and the contact portion; 4. The ball valve according to claim 3, further comprising a tightening means for tightening the pressing member against the elastic body. 6. The contact member according to claim 1, wherein the contact portion is formed of an annular member having a valve seat for rotatably sliding the ball plug. A ball valve according to any one of the preceding claims.