JP2931179B2 - Assembling method of 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 method for assembling a ball valve.

[0002]

2. Description of the Related Art Ball valves are relatively young in various types of on-off valves.
It has advantages such as operability and less fluid resistance in the pipeline, and has recently become a central part of on-off valves.

[0003] Here, regarding the configuration of a conventional ball valve according to the present invention as a prior art, a sphere having a through hole in the center thereof constituting a flow path through which a fluid passes is disposed in a valve box, and the sphere is provided. A seat ring serving as a valve seat rotatably supporting the inside of the valve box and sealing between the valve body and the sphere, and an annular seat retainer for fixing the seat ring to the inner surface of the valve box. Further, an O-ring is fitted between the pipe inner wall end of the seat ring and the pipe inner wall end of the seat retainer.

[0004] By rotating the sphere by operating a valve rod fixed to the sphere, the through-hole provided in the sphere is made to coincide with the axis of the pipe, thereby maximizing the flow path. Release the sphere from this position
It is configured to completely shut off the flow path by rotating by 0 °.

In assembling the ball valve according to the above configuration, after assembling the sphere, the seat ring, the O-ring, and the seat retainer, pressure is applied by an appropriate assembling tool to expand the O-ring on the inner peripheral wall of the valve box. When the opening / closing torque of the sphere obtains a set value at the same time, the seat retainer is finally fixed to the inner periphery of the valve box by, for example, doweling from the outside of the valve box.

[0006]

However, the above assembling method has the following problems. First, when the inner periphery of the valve box is coated with, for example, nylon resin to prevent corrosion of the valve box, the doweling performed when fixing the seat retainer may damage or peel off the nylon resin film. Was. Further, when fixing the seat retainer, pressure was applied by the assembling tool as described above, so that the O-ring was brought into close contact with the inner peripheral wall of the valve box in an enlarged manner, and at the same time, the opening and closing torque of the sphere obtained the set value. In order to do the doweling work and fix it, the process must be done manually,
It was troublesome, and it was difficult to mechanize due to many human factors.

[0007] The present invention has been made in view of such a point, and in assembling a ball valve having the above-described configuration, an artificial element is eliminated so as to cope with mechanization, and the inner periphery of a valve box or the like is provided. It is an object of the present invention to provide a method of assembling a ball valve which does not have a risk of damaging these coated portions even when a resin or the like is coated, and to solve the above problem.

[0008]

In order to achieve the above object, according to the first aspect, a sphere having a through hole at the center is disposed in a valve box, and the sphere is rotatably supported in the valve box. A seat ring for sealing between the inside of the valve box and the sphere, and a seat retainer for fixing the seat ring to the inner surface of the valve box by one end thereof. in ball valve configured to road becomes freely blocking, the outer diameter of the sheet retainer is configured smaller generally tubular than the inner diameter of the valve body, the inner periphery the valve body
With an annular groove, seat rings on both sides of the sphere,
In addition, a seat retainer is attached to each outer end of these seat rings.
, The sphere, seat ring and seat retainer
After integrating them, insert them into the valve box, and then
At least the seat retainer against the annular groove on the inner periphery of the valve box
A ball valve assembling method , characterized in that the ball valve is bulged .

In the above case, as described in claim 2,
An annular O-ring mounting groove is provided on the outer periphery of the seat retainer, an O-ring is mounted in the O-ring mounting groove, and the outer diameter of the O-ring is larger than the outer diameter of the seat retainer and the inner circumference of the valve box. It is also possible to provide an annular groove on the inner periphery of the valve box, and to expand the seat retainer at least in the groove.

Further, in the assembling method according to claim 2,
Also, as described in claim 3, when inserting the sphere, the seat ring and the seat retainer into the valve box, seat rings are previously arranged on both sides of the sphere, and a seat is provided at each outer end of the seat ring. A configuration may be adopted in which a retainer is provided, these spheres, the seat ring, and the seat retainer are integrated, and then these are inserted into the inner periphery of the valve box.

In such an integration, the seat retainer may be integrated so as to be able to be pressed to the sphere side by using, for example, bolts and nuts. .

As described in claim 5, a convex portion may be formed on the inner periphery of the other end of the seat retainer in each of claims 1 to 4 described above.

[0013]

When a substantially cylindrical seat retainer arranged in the valve box is bulged into an annular groove provided in the inner periphery of the valve box, the bulged portion is pressed into the groove, and the seat retainer is pressed. Is fixed in the valve box. Here, for example, bulging (bulgin)
According to g), the sheet retainer may be formed so as to be enlarged toward the outer peripheral side.

Further, since the seat retainer is formed in a substantially tubular shape whose outer diameter is smaller than the inner diameter of the valve box, the seat retainer is smoothly inserted into the valve box, and the inner periphery of the valve box is coated with a resin or the like. Nor does it hurt this. And sphere
Is the body, seat ring and seat retainer integrated?
Since these are inserted into the inner periphery of the valve box,
Easy and quick insertion of these components into the valve box
It can be carried out.

According to the second aspect, the annular O-ring mounting groove is provided on the outer periphery of the seat retainer, and the O-ring is mounted in the O-ring mounting groove. Can be independent of the seal,
This can be ensured by improving the water tightness as a whole.

In the third aspect, since the sphere, the seat ring and the seat retainer are integrated and then inserted into the inner periphery of the valve box, the work of inserting these members into the valve box is facilitated. And can be done quickly.

According to the fourth aspect, since the seat retainer is further integrated so as to be able to be pressed toward the sphere, it is possible to set the opening / closing torque of the sphere before insertion, so that the assembling work is easy and easy. I can do it quickly.

As described in claim 5, if a convex portion is formed on the inner periphery of the other end of the seat retainer to be used,
In carrying out the invention described in each of claims 1 to 4,
When bulging the seat retainer,
By locking the end of the bulging machine to the projection, a pressurizing section of the bulging machine can be constructed, and positioning at the time of bulging can also be performed by the locking.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of a ball valve 1 assembled according to this embodiment, and a valve box used for the ball valve 1. No. 2 is obtained by cutting a commercially available steel pipe to a required length.

At the center of the valve box 2, a bonnet 3 made of a pipe is attached so as to be orthogonal to the valve box 2.
In the illustrated example, the bonnet 3 is attached by fixing the lower end of the bonnet 3 to the outer periphery of the valve box 2 by welding. The valve box 2 corresponding to the axis of the bonnet 3 is provided with a hole through which the valve rod 4 is inserted. The valve rod 4 inserted into the bonnet 3 is rotatable in the hole. And protrudes into the valve box 2, and at the protruding end,
A ball 6 having a through hole 5 constituting a flow path is fixed. In fixing, the axis of the through hole 5 and the axis of the valve box 2 are arranged on the same plane. A cylindrical spacer 7 is inserted into the bonnet 3 at its upper end, and is fixed by doweling from the outside.

In the state shown in FIG. 1, the through hole 5 of the ball 6 and the axis of the valve box 2 are aligned with each other. In this state, the flow path is opened to the maximum. And from this state the valve stem 4
Is rotated by 90 ° to rotate the ball 6 by 90 °.
Changes its angle to the position shown by the two-dot chain line in FIG. 1, and the flow path is completely shut off.

When the ball 6 is in the blocking position, the seal between the outer peripheral edge of the ball 6 and the inner peripheral surface of the valve box 2 needs to be completed. Therefore, in the present invention, the ball 6 is rotatably supported. Seat ring 2 made of Teflon to be a valve seat
1, 22 and these respective seat rings 21, 22 are connected to the valve box 2
Cylindrical sheet retainers 31, 3 for fixing to the inner surface of
2 is used.

The seat rings 21 and 22 have the same structure as shown in FIGS. 1 and 2, respectively. For example, as for the seat ring 21, the seat ring 21 is a Teflon ring-shaped belt as a whole. The inner peripheral portion has the same diameter as the through hole 5 of the ball 6, and has a curved surface 21 a at one side edge of the inner peripheral portion that is in close contact with the surface of the ball 6. . An annular groove 24 for mounting the O-ring 23 is provided on the other end surface. Each of these seat rings 21 and 22 is fixed in the valve box 2 by one end of each of the corresponding seat retainers 31 and 32.

Since the seat retainers 31 and 32 have the same configuration, the configuration of the left seat retainer 31 in FIGS. 1 and 2 will now be described. The seat retainer 31 in this embodiment is a commercially available thin metal pipe. Has a short cylindrical shape as a whole, which is obtained by performing a round cutting with a predetermined short length, and its outer diameter is set to be slightly smaller than the inner diameter of the aforementioned valve box 2. ing.

Further, one end face of the seat retainer 31 is in contact with the end face of the seat ring 21 and the O-ring 23
A small-diameter end surface portion 33 for pressing the sheet retainer 31 is formed.
4 is provided, and an O-ring 35 is fitted in the annular groove 34. The outer diameter of the O-ring 35 is larger than the outer diameter of the seat retainer 31 and smaller than the inner peripheral diameter of the valve box 2. Further, the seat retainer 31 is formed with a tapered portion 36 so that the outer diameter thereof gradually decreases from the central portion toward the small-diameter portion 33 side. The aforementioned seat ring 21 is fixed to the inner periphery of the valve box 2 by the small diameter portion 33 of the seat retainer 31.

Next, the above described ball 6, seat ring 21,
A procedure for mounting the seat 22 and the seat retainers 31, 32 in the valve box 2 will be described. First, as shown in FIG. 2, the seat rings 21, 22 and the seat retainers 31, 32 are arranged with the ball 6 interposed therebetween. For example, the bolt 41 and the nut 42 shown by a two-dot chain line in FIG. In such a case, the opening and closing torque of the ball 6 can be freely set according to the degree of tightening of the bolt 41 and the nut 42.

Prior to the integration by the bolts 41 and the nuts 42, between the other end surfaces of the seat rings 21 and 22 and the end surfaces formed by the small diameter portions 33 of the seat retainers 31 and 32. If a sealant is applied to (the portion indicated by P in FIG. 2), the sealing property between the seat rings 21 and 22 and the seat retainers 31 and 32 is further improved.

The ball 6, the seat rings 21, 22 and the seat retainers 31, 32 integrated with the opening / closing torque of the ball 6 set to a predetermined value as described above are
It is inserted as it is in the valve box 2 to a predetermined position, that is, a position where the end of the valve rod 4 is inserted into the insertion hole 6 a of the ball 6. Since the outer diameters of the seat retainers 31 and 32 are set to be slightly smaller than the inner diameter of the valve box 2, the inner peripheral wall of the valve box 2 is not damaged during such insertion.

Then, when inserted into the predetermined position,
An annular groove 2a wider than the annular groove 34 shown in FIG. 3 is previously formed on the inner peripheral wall of the valve box 2 at a position corresponding to the annular grooves 34, 34 of the seat retainers 31, 32, and then bulging is performed. When the seat retainers 31 and 32 are bulged toward the pipe wall side of the valve box 2 by bulging by a machine, as shown in FIG. 4, the vicinity of the annular groove 34 is inserted into the groove 2a so that the groove 2a becomes a die type. It is extruded and the seat retainer 31 is firmly fixed to the inner peripheral wall of the valve box 2.

At this time, as shown in FIG. 4, the O-ring 35 fitted in the annular groove 34 is pressed against the bottom of the groove 2a to be compressed and deformed, so that an extremely strong seal is secured. Furthermore, in the present embodiment, the seat rings 21 and 22
O-rings 23 are separately provided on the end faces of the seat retainers 31 and 32, and the end faces of the sheet retainers 31 and 32 press the O-rings 23, so that the seal is ensured in response to a higher pressure in the flow path. By the fixing as described above, the seat retainer 31 does not come off from the valve box 2 and does not shift, and the pressing of the seat rings 21 and 22 by the small diameter portions 33 of the seat retainers 31 and 32 is also firm. Become.

Further, regarding the opening and closing torque of the ball 6,
Before being inserted into the valve box 2, the bolt 41 and the nut 42
, The fixing operation by bulging is extremely simple and uniform, and there are extremely few artificial manual elements in the entire assembling operation. Therefore, it is an assembly work that can cope with mechanization.

If, for example, an appropriate jig receiving member is fixed to the inner periphery of the other end of the sheet retainers 31 and 32 to form a projection, the end of the bulging machine used for bulging can be connected to the projection. And the pressurizing portion can be very easily constructed with respect to the seat retainer 31.
Moreover, positioning during bulging can be easily performed.

[0033]

According to the first aspect, when assembling the ball valve, it is easy to fix the seat retainer for fixing the seat ring that supports the sphere rotatably and seals the valve box. , Can sufficiently cope with mechanization. Moreover, at this time, even if the inner periphery of the valve box is coated with a resin or the like, there is no danger of damaging the coating. In addition, into the valve box of each member
Insertion work can be done easily and quickly, and manual work
Measures have been significantly reduced,
And it is possible.

According to the second aspect, the O-ring is further provided on the outer periphery of the seat retainer, so that the seal between the seat retainer and the inner periphery of the valve box is more reliably ensured.

According to the third aspect, the sphere, the seat ring, and the seat retainer are integrated, and then they are inserted into the inner periphery of the valve box. It can be done very easily and quickly. Moreover, the number of manual elements at the time of insertion is significantly reduced as compared with the conventional case, and it is possible to cope with mechanization.

According to the fourth aspect, since the seat retainer is further integrated so as to be able to be pressed to the spherical body side, it is possible to set the torque of the spherical body before assembling to the valve box. The opening and closing torque of the sphere can be easily and quickly set, which is a troublesome and time-consuming operation.

In the fifth aspect, a convex portion is formed on the inner periphery of the other end of the seat retainer to be used. Therefore, in carrying out the inventions of the first to fourth aspects, the seat retainer is expanded by bulging. It is easy to set a deforming machine such as a bulging machine to be used at the time of dispensing, and a pressurizing section for the seat retainer can be easily constructed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a ball valve assembled according to an embodiment.

FIG. 2 is a cross-sectional view showing a state in which a ball, a seat ring, and a seat retainer are integrated before being inserted into a valve box.

FIG. 3 is an enlarged end view of the vicinity of an annular groove of the seat retainer, showing a state before expanding the seat retainer.

FIG. 4 is an enlarged view of a main part of FIG. 1 for showing a state after a seat retainer is expanded.

[Explanation of symbols]

 1 Ball Valve 2 Valve Box 2a Groove 3 Bonnet 4 Valve Stem 5 Through Hole 6 Ball 21 Seat Ring 31 Sea Retainer 32 Sea Retainer 34 Annular Groove 35 O Ring 41 Bolt 42 Nut

Claims (5)

(57) [Claims] A sphere having a through hole at a center portion thereof is disposed in a valve box, the seat ring rotatably supporting the sphere in the valve box, and sealing between the valve box and the sphere; A ball retainer having a seat retainer for fixing the seat ring to the inner surface of the valve box by one end thereof, wherein a flow path in the valve box can be shut off by rotation of the sphere; The retainer is formed in a substantially tubular shape whose outer diameter is smaller than the inner diameter of the valve box , an annular groove is provided on the inner periphery of the valve box, and seat rings are arranged on both sides of the sphere.
A seat retainer is arranged at each outer end of the ring, and the sphere, the seat ring and the seat retainer are integrated.
After that, these are inserted into the valve box , and then the at least
A method for assembling a ball valve , comprising expanding a seat retainer . 2. A sphere having a through hole at a central portion thereof is disposed in a valve box, and the sphere is rotatably supported in the valve box to seal between the valve box and the sphere. A seat retainer for fixing the seat ring to the inner surface of the valve box by one end thereof, wherein the ball is configured so that a flow path in the valve box can be shut off by rotation of the sphere. The retainer is formed in a substantially tubular shape whose outer diameter is smaller than the inner diameter of the valve box. An annular O-ring mounting groove is provided on the outer periphery of the seat retainer , and the O-ring is mounted in the O-ring mounting groove. Further, the outer diameter of the O-ring is larger than the outer diameter of the seat retainer and smaller than the inner peripheral diameter of the valve case, and an annular groove is provided in the inner periphery of the valve case. Bulging the retainer And wherein, the method of assembling the ball valve. 3. A seat ring is arranged on both sides of the spherical body, a seat retainer is further arranged on each outer end of the seat ring, and the spherical body, the seat ring and the seat retainer are integrated. Wherein the seat retainer is expanded afterwards.
3. The method for assembling the ball valve according to 2 . 4. The ball valve assembling method according to claim 3, wherein the seat retainer is integrated so that the seat retainer can be pressed toward the sphere. 5. The seat retainer according to claim 1, wherein a convex portion is formed on the inner periphery of the other end.
Or the method of assembling the ball valve according to 4.