JP2645686B2 - Emergency shutoff ball valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a shutoff valve using a cut end of a pipe as one member, and relates to a highly reliable emergency shutoff ball plug having a low pressure loss, a simple structure, and a high reliability.

[0002]

2. Description of the Related Art A conventional emergency shut-off valve is structurally the same as a flow control valve and can operate the valve more quickly than a flow control valve. What is improving is the technology trend.

FIG. 1 shows a typical structure of a conventional shut-off valve generally used for emergency use.
This chamber is divided into two chambers, a valve seat is made on this partition plate, and a valve element in the form of a needle is pressed against the valve seat in the vertical direction by a screw, for example. The shutoff by this valve is secure but slow. The most serious drawback is that the pressure loss is large due to the complicated flow of the fluid at the valve seat during normal operation. Therefore, it is not preferable to insert a large number of emergency shut-off valves into the piping system.

[0004]

The shut-off valve according to the present invention uses a cut section of a pipe as a valve seat to simplify the structure, while using a ball which is in close contact with the cut section as a valve body.
Of course, this ball is provided outside the pipe flow path under normal conditions, so that there is no pressure loss under normal conditions.

[0005]

Emergency shutoff <br/> ball plug according to the present invention SUMMARY OF THE INVENTION may, capped the leg end, the outer diameter of the leg portion is substantially, a T-fitting so as to be above the pipe provided in the middle of the pipe so as to fit in, the ball is greater than the inner diameter of the pipe loosely accommodated as the valve element in the legs of the hand該継, penetrating the valve body operating rod from the outside of the leg end cap, said Valve operation rod is leg end cover
Has means for locking in a state of being lifted upward,
This locking means shall be easily released in case of emergency,
The ball was suspended from the inner end of the rod via a chain. In addition, the length of the chain
To the position where the valve element completely closes and closes the pipe cut edge
I did not do it .

The lid provided at the leg opening is a leg end.
And a cut end of the tube inserted into the
Valve seat .

[0007]

FIG. 2 shows an emergency shutoff ball stopper according to the present invention.
2 shows a cross section of an embodiment. Numerals 1 and 1 ′ denote pipes, between which a T-shaped joint 2 is interposed and connected. The T-shaped joint 2 which is normally fitted with an outer diameter when branching from the pipes 1 and 1 'can be easily obtained as a pipe member according to the thickness and material of the pipes 1 and 1'.

The T-shaped joint 2 is shown in FIG.
As shown in FIG. 2, the end of the leg is covered by a lid 3, through which a valve operating rod 4 passes. The rod needs to be always held at a certain position where it is pulled out from the lid, and it is preferable to provide an elastic projection 5 in order to prevent erroneous operation. The T-shaped joint 2 may be disposed so as to face, and the elastic projection 5 may be omitted.

An operation handle 7 is attached to a terminal of the rod 4 outside the lid, and a ball 6 is connected from the inner end through, for example, a chain 8.
To conclude. Further, the lid 3 provided in the leg opening is a leg portion.
It has a tube inserted into the end, and the cut end of this tube is
The valve seat for the ball 6.

[0010]

In the ball plug for emergency shutoff of the present invention assembled as described above, the rod 4 is normally pulled out and held by the elastic projection 5 so that the ball 6 is housed in the leg. When there need for emergency shutdown is pushed into the leg hit the rod 4 by hand, for example. At this time, the elastic projection 5 is pushed into the rod. As the rod 4 is pushed into the leg, the ball 6 falls into the flow path of the pipe 1, 1 ′ and is attracted to the cut edge 9 of the pipe 1 by the dynamic pressure. That is, the ball 6 acts as a valve body, and the cut edge 9 acts as a valve seat to shut off the flow of fluid. This state is shown by a dotted line in FIG.
The direction of the fluid is indicated by an arrow 10 in the figure, but if the fluid flows in the opposite direction, the ball 6 is attracted to the cut edge 9 '.

When the emergency shutoff is achieved and the ball stopper is returned, the rod 4 is pulled up to return the ball 6 to the inside of the leg, so that the ball can be prepared for the next emergency shutoff.

In the case where the fluid is gas, the flow path must not be completely blocked in some cases. In this case, it is necessary to shorten the length of the chain 8 and to bring the ball 6 into complete contact with the cut end face 9. It is preferable to set it so that it is not enough.

FIG. 3 shows another embodiment of the above-mentioned emergency shutoff ball plug.

In this case, unlike the embodiment shown in FIG. 2, the T-shaped joint is connected to the pipes 1, 1 'so that the legs are downward. There is no chain between the rod inner end and the ball 6. Also, the projection 5 is not required. Under normal conditions, the ball is housed in the T-shaped leg based on its specific gravity and does not prevent the flow path. However, when the rod 4 is pushed up from the bottom in an emergency, the ball 6 that has accumulated in the leg becomes in the flow path. And adsorbed on the cut edge 9 to block the flow path. If the pressure is removed from the piping system by closing the main valve, the ball will not be attracted and will return to the legs by gravity and return automatically.

FIG. 4 shows an embodiment of an emergency shutoff ball stopper used in a system which is inconvenient if it is automatically reset. Here, the only difference from FIG. 3 is that the shape of the inner end of the rod and the stroke of the rod are longer. FIG. 4 shows an example of the shape of the inner end of the rod. In an emergency, the rod is pushed in and the ball 6 is ejected. When the ball 6 comes into close contact with the cut edge 9, it overcomes the elasticity of the ball and pushes the rod further. Is a structure in which the ball 6 is pressed against the cut end face 9. This pressed state is indicated by a dotted line. This rod inner end 1
2 can be applied to the embodiment shown in FIG. 2, but in any of the embodiments, the inner end shape may be changed to various types in consideration of the size and elasticity of the ball 6, or the rod may be rod-shaped. The rod may be asymmetrical with respect to the axis and pressed when the rod is rotated half a turn.

[0016]

According to the structure of the present invention, a sleeve is generally used for connecting pipes, but since the end of the pipe functions as a valve seat, a T-shaped joint is used at the connection point of pipes and this is urgently shut off. Since it is assembled into a ball plug for emergency use, the installation of a ball plug for emergency shutoff can be achieved at the same time as the splicing of pipes, and the cost of piping work is reduced.

Since the structure according to the invention is quite simple, there is no risk of breakage and no malfunction in operation. It is possible that the seal ring at the neck of the rod is dead because it is not a frequently operated ball stopper.
In addition, since the seal lining 12 wound around the inner end of the rod is attracted to the edge 13 of the rod penetration hole of the lid, maintenance is simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a conventional example of an emergency shutoff valve.

FIG. 2 is a cross-sectional view showing a first embodiment of an emergency shutoff ball stopper according to the present invention.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a sectional view showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1 '... Piping 2 ... T-shaped joint 3 ... Lid 4 ... Valve operating rod 5 ... Elastic projection 6 ... Ball 7 ... Operation handle 8 ... Chain 9 ... Cut edge of pipe 11 ... Rod inner end 12 ... Rod Inner end seal lining 13 ... Edge of rod penetration hole

Claims (3)

(57) [Claims] The method according to claim 1] leg end capped, the legs virtually provided in the middle of the pipe a T-fitting so as to be on top so as to fit the outer diameter of the pipe, in the legs of the hand該継A ball larger than the inner diameter of the pipe is loosely housed as a valve body, and a valve body operation rod penetrates from the outside of the leg end cover, and the valve body operation rod is lifted upward with respect to the leg end cover. An emergency shutoff ball plug having locking means, wherein the locking means can be easily released in an emergency, and the ball is suspended from the inner end of the rod via a chain. 2. The emergency shut-off device according to claim 1, wherein the length of the chain is shortened so that the ball valve does not reach a position where the end of the pipe cut is completely closed. Ball stopper. 3. The lid provided in the leg opening has a tube inserted into the end of the leg, and a cut end of the tube serves as a valve seat of the ball valve body. The emergency stop ball stopper according to claim 1.