JPS6347320Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an assembled ball valve.

Conventionally, in this type of ball valve, a ball inserted into the valve body engages with a spindle to rotate freely, and the ball is pressed by a ball holder. When screwed together with the main body, it is pressed by a connecting sleeve, and is not connected to the valve body, so if the union nut is removed with the ball in the closed state, the ball will be pushed due to the residual pressure in the piping. There was a danger of it flying out. Therefore, in order to eliminate this drawback, as described in U.S. Pat. No. 4,023,773, a step is provided on the inner circumference of the valve body, a lock ring is fitted into this step, and a cam ring is fitted inside the lock ring. A ball valve has been developed that prevents the ball holder from popping out by fitting together, but in this valve, the force that acts when the ball pops out is transmitted from the ball holder to the lock ring, and the step on the outer periphery of the lock ring is connected to the valve body. It is designed to stop when it hits the step on the inner circumference, and because the narrow steps hit each other,
If the lock ring was made of elastic synthetic resin, there was a risk that the stepped portion of the lock ring would chip and the ball would fly out.

The present invention aims to eliminate the above-mentioned drawbacks and provide a ball valve that can completely prevent the ball from flying out even with a thin locking ring by creating a wedge effect in the locking ring.

Next, the ball valve of the present invention will be explained with reference to the drawings.

In the figure, 1 is the valve body, 2 is the ball, and 3 is the spindle. The ball 2 is inserted into the valve body 1,
A spindle 3 is fitted into the groove 21 of the ball 2, and by rotating the spindle 3, the ball 2 is opened and closed. Reference numeral 4 denotes a ball holder, and a ball seat 41 is attached to an example in which the ball 2 is brought into contact with the ball holder. The ball holder 4 is fitted into the valve body 1, and the end face of the ball holder 4 protrudes slightly from the end face of the valve body 1, and a connection socket serving as a pipe connection socket for connecting the valve and the pipe is provided on this end face. 5 are arranged in series, and by screwing a union nut 6 into the valve body 1, the connection socket 5 is pressed against the ball presser 4. By adjusting the tightening of the union nut 6, the ball 2
The seal between the ball seat 41 and the ball seat 41 can be adjusted.

In the present invention, an annular groove 7 is provided across both ends of the valve body 1 and the ball retainer 4, and the circumferential surface is a conically tapered surface that widens inward. The ring 9 is fitted and the ball holder 4 is attached to the valve body 1.
It is designed to prevent it from flying out. Annular groove 7
is a stepped portion 71 on the inner circumferential surface of the end of the valve body 1, the outer circumferential surface of which is a conical tapered surface 72 that widens inward.
and a stepped portion 73 having a cylindrical peripheral surface on the outer peripheral surface of the end portion of the ball presser 4.

The lock ring 8 has an elastic annular body with a part cut out so that the diameter can be reduced.The outer peripheral surface is a tapered surface that almost matches the tapered surface 72 of the annular groove 7, and the inner peripheral surface is a cylindrical surface. There is. Furthermore, when the lock ring 8 is reduced in diameter and fitted into the annular groove 7, its inner peripheral surface is made smaller in diameter than the outer peripheral surface of the ball holder 4, and the lock ring 8 is fitted across the valve body 1 and the ball holder. It is becoming more and more integrated. It is preferable that the angle of inclination of the tapered surface 72 is as steep as possible to fit the lock ring 8.

Further, the retaining ring 9 is fitted between the lock ring 8 and the inner circumferential surface of the annular groove 7, and prevents the lock ring fitted into the annular groove 7 from contracting in diameter.

In the ball valve of the present invention, after the ball retainer 4 is inserted into the valve body 1, the lock ring 8 is fitted into the annular groove 7 with its diameter reduced, and then the retaining ring 9 is fitted, and the connection socket 5 is closed. It is assembled by attaching it with the union nut 6. In addition, in the present invention, the width of the lock ring 8 in the axial direction is made slightly larger than the width of the annular groove 7 of the valve body 1, and it is made to protrude slightly from the end faces of the lock ring 8 and the valve body 1.
If the connection socket 5 is brought into contact with the ball 2, it is possible to prevent the ball presser 4 from pressing excessively against the ball 2 due to over-tightening of the union nut 6.

Further, the lock ring 8 and the like may be provided on only one side of the valve body 1 or on both sides.
If only one side is used, use the side with the lock ring 8 etc. installed as the downstream side when piping.

The ball valve of the present invention has the above-described configuration, and the tapered surface of the locking ring engages with the tapered surface of the annular groove, so that the ball retainer abuts against the locking ring supported by the tapered surface of the annular groove. The ball and ball presser are prevented from flying out. In addition, since the tapered surface of the annular groove is widened at the back and narrows in the direction in which the force is applied, even if the force acting on the lock ring becomes large, there will be a gap between the tapered surface of the annular groove and the tapered surface of the lock ring. A wedge effect occurs, and the lock ring is securely held in the annular groove without being damaged and does not pop out.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the right half of an example of the ball valve of the present invention in cross section, and FIG. 2 is a partial enlarged sectional view showing the main part of FIG. 1 on an enlarged scale. 1...Valve body, 2...Ball, 21...Concave groove, 3...Spindle, 4...Ball holder, 41
... Ball seat, 5 ... Connection socket, 6 ...
Union nut, 7... annular groove, 72... tapered surface, 8... lock ring, 9... retaining ring.

Claims (1)

[Scope of utility model registration request] In a ball valve, a connection socket is connected to a ball holder fitted into the valve body, and this connection socket is formed by pressing the ball holder toward the ball by screwing a union nut to the valve body. An annular groove is formed across both ends of the ball holder and the outer circumferential surface is a conically tapered surface that widens toward the back, and an outer locking ring whose outer circumference is a conically tapered surface and an inner retainer are formed in this annular groove. The ball valve is fitted with a ring, and the lock ring is fitted across the valve body and the ball holder.