JPH03547B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ball valve, and more particularly to a ball valve in which one ball holder is prevented from slipping out from the valve body.

As a conventional ball valve, a ball that can open and close a flow path is placed inside a cylindrical valve body, and a ball seat is brought into contact with this ball from both sides of the flow path, and this ball seat is pushed toward the ball by a ball holder. There is a so-called flexible ball valve that is configured to be pressed. In this ball valve, by connecting the connecting sleeve to the valve body, the ball retainer is pressed by the connecting sleeve and is pressed toward the ball. For example, the ball holder is pressed by a connection sleeve connected to the valve body by a union nut, and the contact pressure between the ball and the ball seat is adjusted by adjusting the tightness of the union nut,
This is a compensation mechanism for fluid leakage due to wear of the ball seat. The biggest drawback of this type of ball valve is that the ball closes the flow path.
Additionally, the union nut and connecting sleeve cannot be removed while maintaining fluid pressure on both sides of the ball. That is, when the pipe connected to the connecting sleeve needs to be repaired or replaced, the connecting sleeve must be removed by loosening the union nut, but when the connecting sleeve is removed, the ball and ball The presser foot flew out from the valve body, which was dangerous.
To solve this problem, there is a device that has a ball holder on only one side and integrates the other with the valve body (for example, the one described in U.S. Pat. No. 3,550,902), and the ball holder is placed on the pressure side. It will be piped towards. However, since the wear of the ball seat is adjusted by tightening the union nut on one side, repeated tightening may cause the ball and spindle to become misaligned, making it difficult to open or close the ball by turning the handle. Rotational torque increases,
In addition to making it difficult to operate smoothly, forcing the spindle to turn it forcefully presses the spindle from only one side, which has the disadvantage of causing leakage from the seal around the spindle.

Also, JP-A-57-37160, JP-A-57-
Publication No. 110873, Publication of Utility Model Publication No. 57-105474, etc.,
By screwing the ball holder into the valve body,
A method for preventing the ball presser from popping out is disclosed, and furthermore, Japanese Patent Publication No. 53-6375 discloses a method of preventing the ball presser from popping out, and furthermore, Japanese Patent Publication No. 53-6375 discloses a method in which a dog is provided on the inner peripheral surface of the valve body by pushing a ball presser with a dog around it into the valve body and rotating it. It is disclosed that the ball presser is engaged with the groove to prevent the ball presser from popping out.

However, there are disadvantages in that a special tool is required to screw or press the ball holder into the valve body, and the structure is complicated, resulting in poor assembly and disassembly workability.

The present invention has a simple structure in which a ball holder with a flange formed on the outer periphery is locked to a stepped part formed at the end of the valve body, thereby making it possible to prevent the balls and the ball holder from flying out. The present invention aims to provide a ball valve that can be retightened from the beginning and can be operated smoothly without leakage.

Next, the ball valve of the present invention will be explained with reference to the drawings. FIG. 1 is a sectional view showing an example of a ball valve of the present invention, in which 1 is a valve body, 2 is a ball serving as a stopper, and 3 and 4 are ball holders. The ball 2 and the ball holders 3 and 4 have through holes 21 and 3 with approximately the same diameter.
1 and 41 are provided, and these through holes serve as fluid flow paths.

A spindle insertion hole 11 is formed approximately in the center of the valve body 1, and a flanged spindle 5 is inserted into the body 1.
The inner end of the spindle 5 is fitted into the concave groove 22 of the ball 2, and the ball 2 is inserted into the through hole 21 of the ball presser 3, 4 by the rotation of the spindle 5. , 41, and can be operated in the direction of closing. The inner end of the spindle 5 has a parallel surface that matches the width of the groove 22, and is fitted into the groove 22 on this parallel surface.

In the present invention, the groove 22 has an abutment wall 23 left at one end, as shown in FIG.
Further, a pin 9 having the same axis as the spindle 5 is provided in the valve body 1 on the opposite side to the spindle 5, and the ball 2 has a concave groove 22 and an abutting wall 25 in the same direction on the opposite side. A groove 24 is formed.

After fitting the ball holder 3 into the valve body 1, the ball 2 is fitted with the spindle 5 and pin 9, and is fitted into the grooves 22 and 24 of the ball 2, and the spindle 5 is rotated 180 degrees. By rotating the ball 2 by .degree., the ball 2 is assembled in the opposite direction within the valve body 1. This ball 2 is configured to rotate within a range of 90 degrees (fully open state) in one direction from the illustrated closed state by a locking mechanism between the handle 7 and the valve body 1.

A stepped portion 12 with a small inner diameter is formed at one end of the inside of the valve body 1, and the ball retainer 3 that is fitted into this end has a flange portion that is engaged with this stepped portion 12. 32 is formed. and,
This ball holder 3 has a stepped portion 1 relative to the valve body 1.
The valve body 1 is assembled by fitting and inserting the valve body from the side opposite to the end where the valve body 1 is provided, and locking the flange portion 32 to the stepped portion 12 of the valve body 1.

Annular notches 33, 42 are formed on the sides of the ball holders 3, 4 that contact the balls 2, and annular ball seats 34, 43 are fitted into these notches 33, 42. 4 toward the ball 2, the ball seats 34, 43 are pressed against the ball 2, and the sealing properties of the flow path are maintained.

In order to have a structure in which the ball holders 3 and 4 can be pressed toward the balls 2, a connection sleeve 6 that connects the pipe is brought into contact with the outer end surface of the ball holders 3 and 4, and this connection sleeve 6 is attached to the union nut 61. It has the same structure as the conventional flexible type, in which the valve body 1 is screwed into a screw formed on the outer circumferential surface of the end of the valve body 1. Even when the ball holders 3 and 4 are pressed toward the balls 2, a gap is still maintained between both end surfaces of the valve body 1 and the connection sleeve 6, and by retightening the union nut 61, the ball seats 34 and 43 are closed.
The contact pressure of the ball 2 on the ball 2 is adjusted.

In the figure, 35 and 44 are O-rings provided between the ball retainers 3 and 4 and the valve body 1;
45 is an O-ring provided between the ball presses 3 and 4 and the connection sleeve 6, and 51 is an O-ring provided between the spindle 5 and the valve body 1.

In the above embodiment, if the ball presser 3 is piped toward the downstream side of the fluid (fluid pressure is applied from the ball presser 4 side), the ball presser 3 will have its flange 32 contact the stepped portion 12 of the valve body 1. Since the ball is locked, the ball presser 3 is moved with the ball 2 in the closed state.
The connecting sleeve 6 can be removed by loosening the side union nut 61.

Further, in order to prevent wear of the ball seats 34 and 43, the union nuts 61 on both sides can be tightened evenly, so that the ball 2 can always be adjusted to be substantially coaxial with the spindle 5.

In FIG. 1, 8 is an elastic packing. This packing 8 is located between the stepped portion 12 of the valve body 1 and the flange portion 32 of the ball presser 3, and even when the ball seats 34, 43 are worn out, the elastic repulsive force of this elastic packing allows the ball to be 2 and the ball seats 34, 43 is maintained, and the contact force is made uniform in the circumferential direction.

The locking mechanism of the handle 7 will be explained based on FIG. A cross-shaped fitting projection 52 is formed on the upper part of the spindle 5', and is fitted into a cross-shaped recess 71 formed in the handle 7, so that when the handle 7 is rotated, the spindle 5' is rotated. It's summery.
Further, a partially cut-out annular protrusion 13 is provided around the outside of the spindle insertion hole 11 of the valve body 1, and a stopper 72 is formed on the handle 7 at the notch of the protrusion 13. The handle 7 can be rotated within a range where the stopper 72 collides with the side surface of the notch of the protrusion 13.

If the position where this stopper 72 collides with the side surface of the protrusion 13 is set so that it opens when the handle 7 faces the direction of the flow path and closes when the handle 7 faces the direction perpendicular to the flow path. , handle 7
You can determine whether the valve is open or closed depending on the direction of the valve. In the embodiment shown in FIG. 1 as well, when in use, the ball presser 3 is piped toward the downstream side of the fluid. In this example, in addition to the function of preventing the ball 2' from flying out by the ball presser 3 as explained in the embodiment shown in FIG.
This prevents the ball 2' from flying out in the opposite direction, so it should not be used in cases where the valve installed in the middle of the piping is installed in the wrong direction, or where pressure is applied in the opposite direction to the piping. Even if there is a ball 2', the ball 2' is prevented from flying out.

In the example shown in FIG. 1, the pin 9 may be attached by fitting into a hole provided on the inner surface of the valve body 1, or may be formed integrally with the valve body 1. When integrated, the protruding height of the pin 9 should be adjusted to the flange 3 of the ball presser 3.
2, and a notch corresponding to the thickness of the pin 9 must be provided in the flange portion 32. Furthermore, since the ball 2' rotates around the pin 9 when the handle 7 is operated to open and close the ball 2', the pin 9 preferably has a cylindrical outer peripheral surface.

The ball valve of the present invention is constructed as described above, and one of the ball holders is provided with a flange, and this flange is engaged with a step formed at the end of the valve body. This prevents the ball from flying out, and by loosening the union nut on the ball holding side and removing the connecting sleeve, the pipe can be replaced. In addition, this ball holder can adjust the pressing force of the ball seat against the balls by retightening the union nuts, so to prevent wear of the ball seat, tightening the union nuts on both sides will tighten the ball and spindle. The steering wheel can be operated smoothly at all times by reducing misalignment between the handle and the handle.

Further, in the present invention, the ball is formed with a groove having an abutment wall into which the spindle and the pin fit, and the spindle and the pin are fitted into this groove with the abutment wall positioned on one side of the ball presser. Therefore, the spindle and pin prevent the ball from flying out from the valve body, and in combination with the above effect, the ball can be prevented from flying out in both directions, so if the valve is connected in the wrong direction or in the wrong direction. There is no danger even when pressure is applied.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the ball valve of the present invention, FIG. 2 is a front view of the ball in FIG. 1,
FIG. 3 is a sectional view taken along the - line in FIG. 1. DESCRIPTION OF SYMBOLS 1... Valve body, 12... Step part, 2... Ball, 22, 24... Concave groove, 23, 25... Abutment wall, 3, 4... Ball holder, 32... Flange part, 3
4,43...ball seat, 5...spindle,
6... Connection sleeve, 61... Union nut,
7...Handle, 9...Pin.

Claims (1)

[Claims] 1 A ball that can open and close a flow path is arranged in the valve body, a ball seat is brought into contact with this ball from both sides of the flow path, and this ball seat is pressed toward the ball by a ball presser. In the valve, a flange is provided on the outer periphery of one ball holder, and this flange is latched from the inside to a step formed at the end of the valve body. A ball valve characterized in that a recessed groove having an abutting wall into which a latched pin is fitted is formed, and the spindle and the pin are fitted into the recessed groove with the abutting wall positioned on the one ball holding side.