JPS6231780A - Ball valve - Google Patents

Abstract

PURPOSE:To prevent the reverse revolution of ball pressing by positioning the projections of a valve body into the cut part formed onto the ball pressing, when the ball pressing is blocked. CONSTITUTION:A valve body 1 and a ball pressing 5 are held by the engagement between the projecting stripes 12 and 12 formed onto the inner periphery of the valve body 1 and the engagement groove 55 formed onto the outer periphery of the ball pressing 5. Further, a collar 91 having a cut part 92 is installed onto the periphery of the outer side edge of the ball pressing 5, and a projection 13 is formed at the edge surface of the valve body 1. The ball pressing 5 is inserted into the valve body 1, and the projection 13 of the valve body 1 is inserted into the cut part 92 of the collar 91, at the engagement position between the engagement groove 55 of the ball pressing 5 and the projection stripe 12 of the valve body 1 by turning the ball pressing 5.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a ball valve, and more particularly to a block type ball valve in which the balls are prevented from coming out of the valve body.

(Prior art) Conventionally, as a Nopol valve, a ball that can open and close a flow path is arranged in 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 used as a ball presser. There is a so-called union type ball valve that is pressed against the ball by the ball. In this ball valve, by connecting the connecting sleeve to the valve body, the ball holder is pressed by the connecting sleeve and is pressed toward the ball. For example, the pole 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. When the ball seat wears out and fluid leaks, K has a mechanism that can prevent leakage by tightening the union nut.

The biggest drawback of this type of ball valve is that the ball closes the flow path and it is not possible to remove the union nut and connecting sleeve on the other side while maintaining fluid pressure on one side of the ball. be. That is, when it is necessary to repair or replace the connecting sleeve connected to the connecting sleeve, 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, posing a danger.

As a solution to this drawback, the
The publication describes a so-called bayonet that prevents the ball press from popping out by pushing a ball press with a dog around it into the valve body and rotating the dog to engage a groove provided on the inner circumference of the valve body. What has been done is disclosed.

And in this valve, press the ball? In order to prevent the dog from turning in the opposite direction and causing the dog to slip out of the groove and the ball holder and ball to fly out, there should be a space between the inner surface of the valve body and the pole holder in the circumferential direction when the ball holder is turned. It is common practice to insert a claw for preventing the ball holder from reversing into the gap that occurs.

(Problem to be Solved by the Invention) In the above ball valve, a tab is inserted into the gap to prevent the ball holder from reversing, but there is a risk of forgetting to insert this tab when assembling the valve. , there is a drawback that there is a high risk of encountering unexpected dangers,
Especially after disassembling the ball valve installed at the piping site.
When assembling, workers who are not familiar with the structure often forget to insert buttons and small tabs.

Furthermore, since it is necessary to assemble small parts, there is also the drawback that the assembly work is complicated.

(Means for Solving the Problems) The present invention is a block type ball valve that solves the above-described drawbacks of the conventional ball valve. By providing a protrusion on the end face and inserting the ball holder into the valve body and turning it, it is possible to prevent the ball holder from blocking when the engagement groove of the ball holder and the protrusion on the valve body are engaged and the ball holder is blocked. By locating the protrusion in the notch, the ball presser is prevented from reversing.

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

In the figure, a ball 2 is inserted into the body 1 of the one-piece valve body, and a spindle 3 penetrating the wall surface of the body 1 is fitted into a groove 21 of the ball 2.

A ball seat 4 is applied to both sides of this pole/L/20, and a pole presser 5 is inserted and held therein.

The ball seat 4 is fitted into and supported by a ball presser 5.

A union nut 7 is screwed onto a male thread 11 on the outer periphery of the end of the valve body 1, and the union nut 7 presses the connection sleeve 6 toward the ball holder 5 to connect it to the pipe.

When the connection sleeve 6 is pressed against the end face of the pole holder 5 by the union nut 7, a gap is created between the collar 91 of the pole holder 5 and the end face of the valve body 1. When a leak occurs, the union nut 7 can be further tightened to eliminate the leak.

In this invention, the engagement and retention of the ball presser 5 with the valve body 1 is achieved by a protrusion 1 provided on the inner periphery of the valve body 1.
2, 12 and the engagement groove 55 provided on the outer periphery of the pole holder 5
This is done by engaging with.

Projections 12, 12 are provided on the inner peripheral surface of the valve body 1 into which the ball presser 5 is inserted. These protrusions 12, 12 are
When pushing the ball 2 into the valve body 1 in the direction in which the flow path is closed, the ball 2 is thrown along the same direction to a position facing the flow path hole 22 of the ball 2. That is, since the channel hole 22 is sunk in the ball 2, the channel hole 22 and the surrounding area are recessed from the spherical surface of the ball 2, and the ball 2 cannot be inserted into this recessed portion. The protrusions 12, 12 are provided within a range that does not interfere. The height of the protrusion 12.12 is limited within the recessed portion of the ball 2, but its width is such that the pressure acting on the ball 2 can be reduced by the ball presser 5.
It is determined that the receiver can be safely stopped via the

Further, the ball presser 5 is provided with a stepped portion 51 into which the pole seat 4 is fitted and supported, and the outer periphery thereof includes a large diameter portion 52 that is pushed along the inner peripheral surface of the valve body 1, and a large diameter portion 52 that is pushed in along the inner circumferential surface of the valve body 1, and the protrusion 12.
12 are provided at two alternate locations. The large diameter portion 52 forms the outer peripheral cylindrical surface of the ball presser 5, while the small diameter portion 53 has a #I protrusion 12°12
The stepped portion 54 is formed at a position on the outside of the large diameter portion and is slightly longer than the length of the large diameter portion 52, which is continuous with the outer circumferential cylindrical surface having the same diameter as the large diameter portion 52. By providing such a small diameter portion 53, even if the protrusion 12.12 is provided, the ball presser 5 can be inserted into the valve body 11C and the pole seat 4 can be pressed toward the ball 2. There is.

Furthermore, an engagement groove 55 is provided in the large diameter portion 52.52 located at the small diameter portion 53.53 of this ball presser 5 in the circumferential direction along the step portion 54. The width of the engagement groove 55 is slightly wider than the width of the protrusion 12 from this side with the stepped portion 54 as one side, and when the engagement groove 55 and the protrusion 12 are engaged, Hold the ball holder 5 and hold the ball 2 again.
It is now possible to adjust the suppression R toward . On the opposite side of the engagement groove 55 from the stepped portion 54, the large diameter portion 52 is cut down in the circumferential direction to form a locking protrusion 56, and the locking protrusion 56 engages with the protrusion 12. This prevents the ball presser 5 from flying out from the valve body 1. The locking protrusion 56 may be provided over the entire circumferential width of the large diameter portion 52,
Since one end in the circumferential direction is left as a large diameter part, this becomes a store (-57), and the ball presser 5 is pushed into the valve body l and rotated in the same direction to engage the protrusion 2. Groove 5
5, the two can be completely engaged.

Further, the beer presser 5 is provided with an annular groove 58 and a KQ-shaped groove 59 on the outer end surface on the outer periphery of the side corresponding to the end of the valve body,
O-rings 81 and 82 are fitted into these grooves 58 and 59 to prevent leakage between the ball presser 5, the inner peripheral surface of the valve body, and the connecting sleeve 6.

Moreover, in this invention, a notch 92 exists around the outer end of the pole holder 5 #! ! 91 is provided, and a protrusion 13 is provided on the end surface of the valve body 1. The ball presser 5 is inserted into the valve body 1, and the ball presser 5 is rotated to connect the engagement groove 55 of the ball presser 5 with the valve body. The protrusion 13 of the valve body 1 is inserted into the notch 92 of the collar at the position where the protrusion 12 of the valve body 1 is engaged.

That is, as shown in FIG. 10, when the pole holder 5 is turned so that the notch 92 of the collar 91 coincides with the position of the protrusion 13,
Due to the engagement between the engagement groove 55 and the protrusion 12 of the valve body 1, the ball presser 5 is drawn into the valve body 1, and the protrusion 1
3 is fitted into the notch 92 of the collar 91 by the dimension l shown in the example diagram. For this purpose, the engagement groove 55 of the ball presser 5
position and length to flange 91, and protrusion 1 of valve body l
2 and the length to the protrusion 13 are determined in this way, and the tip of the locking protrusion 56 is set so that the ball presser 5 is pulled into the valve body when the protrusion 12 is engaged with the engagement groove 55. It is sufficient to provide an inclined surface in the section. The collar 91 is elastically deformed and slides on the protrusion 13, and the protrusion 13 fits into the notch 92.

It is preferable that the protrusion 13 has a short columnar shape with a spherical end surface, and the notch 92 #i may have a shape that allows the protrusion 13 to fit therein. The collar 91 may be provided around the entire circumference of the pole presser 5, but the ball presser 5
In order to make it easier to turn with a tool, it is preferable to cut out a part in a quadrilateral shape. Furthermore, after inserting the ball presser 5 into the valve body 1, it is preferable to mark an arrow indicating the direction in which the ball presser 5 is to be rotated and a triangular mark that will match when the rotation is completed. Further, it is good balance to provide two notches 92 of the collar 91 and two protrusions 13 at facing positions.

Further, FIG. 11 shows the state when the ball presser 5 is pushed toward the ball 2.

Then, KH assembles the ball valve having the above structure, inserts the spindle 3 into the valve body 1, makes its lower end protrude inside the main body, and moves the pole 2 in the direction where the flow passage hole 22 is closed. It is inserted from the end of the valve body 1 toward the end of the valve body 1, and is fitted with the lower end of the spindle 3. Next, the ball seat 4 and the ball retainer 5 with the O-ring 81 embedded in the outer circumferential groove 58 are inserted into the tip, with the small diameter part 53 aligned with the protrusion 12 of the valve body 1 at the position lfK, so that the ball seat 4 is When the ball presser 5 comes into contact with the ball 2, the ball presser 5 is rotated in the circumferential direction to engage the projection 12 with the engagement groove 55 of the ball presser 5.

At this time, check the direction in which the ball presser 5 is rotated using the arrow, and make sure that the rotation is completed using the notch 92 in the collar.
It is confirmed by the fit between the protrusion 13 and the triangular mark. Furthermore, fit the OIJ song 2 into the groove 59 on the end surface of the ball holder 5, apply the connection sleeve 6, screw the union nut 7 onto the male thread 11 on the outer periphery of the end of the valve body 1, and attach the connection sleeve 6 to the ball holder 5. A handle (not shown) is fitted onto the spindle 3 to complete the assembly of the valve of the present invention.

In this invention, each part can be made of metal as well as plastic. In the case of plastic, each part is made by injection molding, but in the above example, only the protrusions 12 and 12 are provided on the inner peripheral surface of the valve body l, so there are no other parts than the protrusions 12 and 12. The core can be pulled out on both sides of the inner peripheral surface, and the protrusion 12.1
Since it is only necessary to leave the core of the inner part of 2 in charge,
It can be molded using a mold with a simple structure.

Furthermore, since the inner circumferential surface of the valve body 1 on the end side of the protrusion 12 can be molded with an integral mold with a circular cross section and no cracks,
By using a mold with a smooth, scratch-free surface, it is possible to mold a product with an inner circumferential surface that does not have any cracks or unevenness, which reduces the number of processes and manufacturing man-hours compared to those formed by cutting. can.

In addition, in this invention, the mechanism for preventing the ball 2 from popping out by the engagement between the above-mentioned protrusion 12 and the engagement groove 55 of the ball presser 5 is as follows.
It may be provided on both sides of the ball 2 or only on one side. In the case of one side, the ball holder on the opposite side may have no pop-out prevention mechanism, or the ball holder may be formed integrally with the valve body.

Further, the present invention can be applied to any block type ball valve that prevents the ball and the ball holder from flying out by inserting the ball holder into the valve body and rotating it. For example, Jikko w353-63 cited as a precedent example
Even in the case of the bayonet type block ball valve described in No. 75, a collar having a notch similar to that of the above embodiment is provided at the outer end of the pole holder, and a protrusion is formed on the end face of the valve body, so that the pole holder is The dog is inserted into the valve body through the axial groove in the valve body, and the ball retainer is rotated so that the dog passes through the annular groove in the valve body and the lip (
When this lip is engaged (corresponding to a protrusion in the present invention), the protrusion on the end surface of the valve body may be fitted into the notch of the collar of the ball holder, similar to the embodiment described above. This eliminates the need for a claw to prevent reverse rotation.

(Effects of the Invention) The ball valve of the present invention has the above-mentioned configuration, in which a collar with a notch is provided at the outer end of the pole holder, a protrusion is provided on the end face of the valve body, and the ball holder is inserted into the valve body. By inserting and rotating the ball holder, the engagement groove of the ball holder is engaged with the protrusion of the valve body, and when the ball holder is blocked by the valve body, 1 by positioning the protrusion within the cutout, The collar of the pole holder is fixed with a protrusion to prevent the ball holder from rotating backwards.

Therefore, just by pushing in and turning the ball holder, the ball holder is blocked and its reverse rotation is prevented.
Unlike the conventional example, there is no fear of forgetting to set the anti-reverse claw, and the anti-reverse mechanism automatically works when assembled, and is easy to assemble.

[Brief explanation of drawings]

@ Figure 1 is a longitudinal cross-sectional view showing an example of the ball valve of the present invention, Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, Figure 3 is a side view showing an example of the valve body, Figure 4 - is a sectional view taken along line ff-4 in Fig. 3, gIJ5 is a side view showing an example of a state in which a spindle and a ball are set in the valve body, Fig. 6 is a front view showing an example of a ball holder, and Fig. 7 6 is a side view of FIG. 6, FIG. 8 is a side view of an example of the ball valve of the present invention with the connection sleeve 6 and union nut 7 removed on one side, and FIG. 9 is a side view of the ball holder 5 attached to the valve body. FIG. 10 is a partial sectional view taken along the line X-X in FIG. It is. DESCRIPTION OF SYMBOLS 1...Valve body, 12...Protrusion, 13...Protrusion, 2...Ball, 3...Spindle, 4...Ball seat, 5...Ball holder, 51... Step part, 52
...Large diameter part, 53...Small diameter part, 54...Step part, 5
5... Engagement groove, 56... Locking protrusion, 57... Stopper, 58... Annular groove, 6... Connection sleeve, 7
...Union nut, 81...0 ring, 91...
・Tsuba, 92...Notch.

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 ball valve, the inner peripheral surface of the valve body into which the ball holder is inserted is provided with at least a pair of facing protrusions along the circumferential direction, and the ball holder is provided with an inner peripheral surface of the valve body. Large-diameter portions inserted into the surface and small-diameter portions pushed along the protruding portion are provided alternately in the circumferential direction, and on the outside of the large-diameter portion, a retaining portion in which the small-diameter portion is extended in the circumferential direction is provided. A matching groove is provided so that the engaging groove of the ball holder and the protrusion of the valve body are engaged with each other, a flange having a notch is provided at the outer end of the ball holder, and a flange having a notch is provided on the end surface of the valve body. A ball characterized in that a protrusion is provided, and the protrusion is positioned within a notch of the collar at a position where the engagement groove of the ball holder and the protrusion of the valve body are engaged. valve. 2. The pair of protrusions are provided on the inner circumferential surface of the valve body facing the flow passage hole of the ball when the ball is oriented in a direction in which the flow passage is closed. Ball valve. 3. The ball valve according to claim 1 or 2, wherein the notch and the protrusion are provided at two opposing locations.