JP3006916B2 - Ceramic 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 an improvement in a ceramic ball valve used for a fluid line of, for example, a chemical device or a mechanical device.

[0002]

2. Description of the Related Art Conventionally, as this type of ceramic ball valve, for example, the one described in Japanese Utility Model Publication No. Sho 62-38062 is known. The ceramic ball valve basically includes a ceramic valve box (valve box and socket) divided into a plurality, a ceramic ball valve rotatably provided in the valve box, and a valve box. A valve stem that is rotatably provided to rotate the ball valve body, a pair of rings provided on both sides of the valve box, a fastener that fastens the two rings to integrate the valve box, and an outside of each ring It comprises a pair of provided flanges, a tubular body provided on the outer periphery of the valve box between the two flanges, and a fastening ring for fastening the flange and the tubular body and fixing them to the valve box. Thus, such a member is fixed by fastening the flanges which are interposed between the pair of flange pipes and are engaged with each other with a fastener such as a bolt. However, since such a product is a finished product that does not separate by itself, the number of parts is increased, the structure is complicated, and the cost is high.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made in order to solve the problems. The object of the present invention is to simplify the structure and reduce the cost. It is to provide a ceramic ball valve that can do things.

[0004]

A ceramic ball valve according to the present invention basically comprises a ceramic valve box divided into a plurality of parts, and a ceramic ball valve rotatably provided in the valve box. And a valve stem rotatably provided on the valve box to rotate the ball valve body, an elastic ring body for temporarily fixing the valve box, a pair of flange pipes in which the valve box is interposed, and fastening both flange pipes And a fastener that integrates the valve box.

[0005]

A ceramic ball valve is housed in one of a plurality of divided ceramic valve boxes. A valve rod is inserted into the valve box in which the ball valve is stored, and is connected to the ball valve. The valve box with the valve stem inserted is combined with the rest of the valve box. The combined valve box is temporarily fixed with an elastic ring. The temporarily fixed valve box is interposed between a pair of flange pipes.
Both flange tubes are fastened with fasteners. Then, the temporarily fixed valve box is integrally tightened and held and attached to the flange pipe.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional side view showing a ceramic ball valve according to a first embodiment of the present invention. FIG. 2 is a plan view of FIG. 1 showing only the hood cover. The ceramic ball valve 1 includes a valve box 2, a ball valve 3, a valve rod 4, an elastic ring 5,
The main part is comprised from the flange pipe 6 and the fastener 7. The valve box 2 is made of ceramic divided into a plurality of parts. In this example, the valve box 2 is divided into two parts in the axial direction (the left-right direction in FIG. 1), and the left valve box body 8 and the right valve box cover are provided. And body 9. The valve body 8 has a substantially cylindrical shape, and seals the inflow path 10, the valve seat 11 forming a part of the spherical surface, the valve chamber 12 having a larger diameter than the inflow path 10, and the valve box cover 9. O
A concave groove 14 in which the ring 13 is fitted, and a tapered hole 15 having a gradually decreasing diameter as it goes upward in communication with the valve chamber 12 are formed. The valve body 8 includes a hood 16 and a hood cover 17. The bonnet 16 is made of ceramic which is provided in the valve box 2 and rotatably supports the valve rod 4. In this example, the bonnet 16 is made of ceramic and has a substantially cylindrical shape, and is adapted to the large diameter hole 18 and the tapered hole 15. An adhesive (not shown) is interposed between them to form a tapered portion 19 fixed to the valve box body 8. The bonnet cover 17 is covered by the bonnet 16 to prevent the valve stem 4 from being pulled out. In this example, the bonnet cover 17 is made of metal such as stainless steel and has a substantially cylindrical shape, and is divided into two right and left parts.
And a peripheral wall 21, a lower wall 22, a flange wall 23, and a coupling 24 such as a bolt and a nut for coupling the flange walls 23 to each other. The valve box cover 9 has a substantially cylindrical shape having the same outer diameter as the valve box body 8, and has a valve seat 25 forming a part of a spherical surface, an outflow passage 26, and a step fitted to the right side of the valve box body 8. A portion 27 is formed. The ball valve element 3 is made of ceramics rotatably provided in the valve box 2 and has a substantially spherical shape in this example, a valve hole 28 communicating the inflow path 10 and the outflow path 26, and a detent hole. 29, which are housed in the valve chamber 12 and the outer surface of which is the valve seat 1.
1,25. The valve stem 4 is rotatably provided on the valve box 2 and rotates the ball valve body 3. In this example, the valve stem 4 is made of stainless steel and has a substantially rod shape, and a connecting portion 31 to which an operating mechanism 30 such as a handle is connected. O, which seals the bonnet 16 with the flange 32 fitted in the large-diameter hole 18
A depressed groove 34 in which the ring 33 is fitted and a detent part 35 that is fitted in the detent hole 29 are formed. The elastic ring 5 is
The valve box 2 is temporarily fixed, and in this example, a rubber band which is elastically expandable and contractable is fitted to a divided portion between the valve box body 8 and the valve box cover 9. The flange pipe 6 is a pair of pipes in which the valve box 2 is interposed. In this example, the pipes 6 are made of metal such as stainless steel and are separated from each other on the left and right sides. A packing 37 for sealing is interposed between the flange 36 and the valve box 2. The fastener 7 is for fastening the two flange pipes 6 to integrate the valve box 2. In this example, the fastener 7 is a bolt / nut for fastening the pair of flanges 36 together. Next, the operation will be described based on such a configuration. The bonnet 16 is connected to the valve body 8. At this time, the bonnet 16 is inserted upward from the valve chamber 12 and fitted with an adhesive between the tapered hole 15 and the tapered portion 19. In the valve chamber 12 of the valve body 8 to which the bonnet 16 is connected,
The ball valve 3 is housed. The valve stem 4 is inserted into the bonnet 16 from above and connected to the ball valve body 3. At this time, the O-ring 33 is fitted in the concave groove 34 in advance, and the flange 3
2 is located in the large-diameter hole 18, and the detent part 35 is fitted in the detent hole 29. In the bonnet 16 through which the valve stem 4 has been inserted,
The hood cover 17 is covered. At this time, the bonnet cover 17 divided into right and left is externally fitted to the bonnet 16, and the adjacent flange walls 23 are connected by the connecting tool 24. In this way, the valve rod 4 is prevented from being pulled upward, and the bonnet 16 is also prevented from being pulled downward. The valve box body 8 thus constructed includes a valve box cover 9.
Are united. At this time, the O-ring 13 is
Is fitted, and this part is fitted to the step 27. By doing so, the outer surface of the ball valve body 3 is
It is matched. The elastic ring 5 is externally fitted to the divided portion of the united valve box body 8 and the valve box cover 9. By doing so, the valve box main body 8 and the valve box cover 9 are temporarily fixed and kept in a united state. The temporarily fixed valve box body 8 and valve box cover 9 are inserted between the opposed flanges 36 of the flange pipe 6. At this time, packing 37 is interposed between the flange 36 and the valve box main body 8 and between the valve box cover 9 and the flange 36. The valve box body 8 and the valve box cover 9 interposed between the flanges 36 and temporarily fixed are clamped and fixed by fasteners 7 for fastening the flanges 36 together. Connecting part 31 of valve stem 4
Is connected to the operation mechanism 30. FIG. 1 shows a valve closed state. In such a state, when the valve stem 4 is rotated by the operation mechanism 30 to open the ball valve body 3, the fluid from the left flange pipe 6 flows from the inflow path 10 to the valve hole 28 to the outflow path. 26 → flows to the right flange pipe 6.

Next, a second embodiment of the present invention will be described with reference to FIGS. The second embodiment is different from the first embodiment in that an insertion hole 38 for inserting the valve stem 4 and a recess 39 for fitting the bonnet 16 are formed in the valve box body 8. Are fitted together with an adhesive (not shown), the valve body 8 and the bonnet 16 are welded, and the lower wall 22 is omitted so that the bonnet cover 17 does not hit the welded portion. Different from one embodiment. The valve body 8 and the bonnet 16 are both made of ceramic, but in recent years, improved welding conditions have made it possible to perform welding in the same manner as metal.

In the above embodiment, the valve box 2 is divided into two parts by the valve box body 8 and the valve box cover 9. However, the present invention is not limited to this. For example, Japanese Utility Model Publication No. Sho 62-38062. Alternatively, the number of divisions may be three or more depending on the valve box and the socket. The elastic ring 5 is a rubber band in the above embodiment, but is not limited thereto, and may be a metal band that can be elastically expanded and contracted, for example. The fastener 7 is a bolt and a nut in the above embodiment, but is not limited thereto. In the above embodiment, the hood cover 17 is divided into right and left parts and
However, the present invention is not limited to this. For example, the flange wall 23 and the coupling tool 24 may be omitted to be integrated, and these may be fitted to the bonnet 16 with an adhesive interposed therebetween. May be combined.

[0009]

As described above, according to the present invention,
The following excellent effects can be obtained. (1) Valve box, ball valve, valve stem, elastic ring, flange pipe,
It is composed of fasteners, and especially the valve box divided by these using the flange pipe and the fasteners is united and fixed, so the number of parts can be reduced as much as possible, the structure is simplified and the cost is reduced. Can be planned. (2) Since the divided valve box is temporarily fixed by the elastic ring, the combined state of the valve box is maintained, and the insertion and installation into the flange pipe becomes easy. (3) Since the pair of flange pipes are fastened by fasteners, the number of fasteners can be reduced, and the mounting of the valve to the flange pipes can be simplified.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing a ceramic ball valve according to a first embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1 showing only a hood cover.

FIG. 3 is a vertical sectional side view showing a ceramic ball valve according to a second embodiment of the present invention.

FIG. 4 is a plan view of FIG. 3 showing only a hood cover.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramic ball valve 2 Valve box 3 Ball valve body 4 Valve stem 5 Elastic ring 6 Flange pipe 7 Fastener

Claims (1)

(57) [Claims] A ceramic valve box divided into a plurality of pieces, a ceramic ball valve rotatably provided in the valve box, and a ball valve rotatably provided in the valve box to rotate the ball valve. A valve rod, an elastic ring for temporarily fixing the valve box, a pair of flange pipes on which the valve box is interposed, and a fastener for fastening the two flange pipes to integrate the valve box. Characteristic ceramic ball valve.