JPH0125822Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a centering device for aligning the center lines of a butterfly valve and piping when installing the butterfly valve in a piping system.

[Conventional technology]

When installing a chimney valve on a pipeline, the center axes of the chimney valve and the piping must be aligned, but the flange standards on the piping side differ between Japan and overseas, and the pitch of the mounting bolts, There are many different bolt diameters and numbers.

Since it is practically impossible to prepare a wide variety of chimney-shaped valve bodies to match such diversity on the piping side, various methods have been proposed and adopted in the past. .

One such method is to form an elliptical or polygonal centering hole 1 in the valve body as shown in Figure 4, but this method can only accommodate about two types of flange standards. Because the standards were insufficient, it was necessary to prepare numerous standards for chi-shaped valves.

The second method, as shown in Fig. 5, is to attach a centering bracket 2, which is formed separately on the valve body, to a screw 3.
etc., and by replacing the bracket 2, it is possible to adapt to the diversity of piping, as disclosed in, for example, US Pat. No. 4,399,833.

[Problem that the invention attempts to solve]

In the first method, it is practically impossible to deal with the diversity of flange specifications on the piping side. or,
In the second method, if the flange standard is changed after assembly is completed, it is necessary to disassemble and reassemble, which is time-consuming and difficult, and it is difficult to change the flange standard at the site. If disassembly and assembly are required, there is a risk that parts may be lost or assembled incorrectly. Furthermore, screw holes must be formed in the main body to attach the bracket, which requires time and effort, and when attaching the post-shaped valve to the piping, there is a risk of suspending a bracket that is not strong enough with wire, etc. It was hot.

This idea eliminates the drawbacks of conventional ones, makes it easily variable according to flange standards, and
This variableness can be made without disassembling the valve itself even after assembly, there is no risk of it being suspended by wires, etc., and there is no need for screw machining such as mounting a bracket.

[Means for solving the problem] In order to solve the above problems, the method adopted by this invention is to attach the seat ring fixed to the main body of the chi-shaped valve along the flange surface of the main body. A protrusion is formed extending outward from the outer peripheral surface of the pipe, and the protrusion is interposed in a gap between the main body and the piping flange bolt.

〔Example〕

A preferred embodiment of this invention will be described with reference to FIGS. 1 to 3. In the figure, reference numeral 10 denotes a cylindrical main body, in which a disk-shaped valve body 11 is rotatably supported at the center. A seat ring 12 is fixed to the inner peripheral surface of the main body 10 and is made of rubber or synthetic resin. As shown in the drawings, the seat ring 12 is aligned with the position of the bolt 14 of the piping flange along both side flange surfaces of the main body 10, partially extends in the diametrical direction, and projects outward from the outer peripheral surface of the main body 10. A protrusion 13 is formed. The protruding length of the protruding portion 13 corresponds to the gap between the outer circumferential surface of the main body 10 and the piping flange bolt 14, so that the central axes of the piping side and the chimney-shaped valve are accurately aligned.

The protrusion 13 can be cut, and if the gap between the outer peripheral surface of the main body 10 and the piping flange bolt 14 changes due to a change in the flange standard, the protrusion 13 can be cut to the required length to fill the changed gap. It is possible to make it correspond. In order to facilitate cutting of the protrusion 13, it is advantageous to form a plurality of cutouts 15 corresponding to each flange standard.
The protrusion 13 does not need to be formed on both sides of the main body,
Of course, it may be formed only on one side.

[Effect of idea]

According to this invention, the seat ring fixed to the main body of the chimney-shaped valve is extended outward from the outer peripheral surface of the main body along the flange surface of the main body to form a protrusion,
Since the protrusion is interposed in the gap between the main body and the piping flange bolt, the following very remarkable effects can be achieved.

(b) By cutting the protruding part to match the flange standard, centering can be done extremely easily, so the main body can be adapted to several types of flange standards as one unified standard.

(b) Since the protrusion can be formed at the same time as the seat ring is molded, there is no increase in cost.

(c) There is no need for machining, which is required when attaching a bracket to the main body, and only molding of the seat ring is required, which allows cost reduction and mass production.

(d) Since it is impossible to suspend the protruding part with a wire or the like, there is no risk of danger as would occur when suspending a conventional bracket with a wire.

[Brief explanation of drawings]

Fig. 1 is a front view showing the centering state by the centering device according to this invention, Fig. 2 is a sectional view of the main part, Fig. 3 is a perspective view showing the relationship with the piping side, and Figs. 4 and 5 are FIG. 2 is a front view of a valve equipped with a conventional centering device. DESCRIPTION OF SYMBOLS 10... Main body, 11... Valve body, 12... Seat ring, 13... Protrusion part, 14... Piping flange bolt, 15... Notch part.

Claims (1)

[Scope of utility model registration request] A seat ring fixed to the main body of the chi-shaped valve is extended outward from the outer peripheral surface of the main body along the flange surface of the main body to form a protrusion, and the protrusion is inserted into the gap between the main body and the piping flange bolt. What is claimed is: 1. A centering device for a chiffon-shaped valve, characterized in that the centering device is interposed.