JPS6024550Y2 - Centering member for chiyo type valve - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a centering member used when attaching a butterfly valve to a piping system.

When a butterfly valve is disposed between opposing flanges of adjacent pipe ends of a pipeline, it is necessary to precisely align the center axis of the pipe with that of the butterfly valve.

If these rain center lines do not match, the valve will not only provide resistance to the fluid in the pipe, resulting in a decrease in efficiency, but also impurities will accumulate in the corners of the contact area between the two, causing the valve to become It can cause wear and tear, and in extreme cases, it can adversely affect the opening and closing operations of the valve plate.

In order to eliminate this problem, first, form a protrusion extending outward on the outer periphery of the annular valve body of the butterfly valve, and make an appropriate number of bolt insertion holes in this protrusion to attach it to the end of the adjacent pipe. For installation, when inserting and tightening bolts into the bolt insertion holes formed in the opposing flanges, at the location where the butterfly valve is installed, insert the bolts into the bolt insertion holes of the valve between the bolt insertion holes of both flanges. The relative position of the butterfly valve with respect to the pipe is determined by inserting the bolt through the pipe, and at this time, there is already a means for determining the position of the bolt insertion hole on the butterfly valve side in advance so that the center axes of the pipe and valve coincide. Widely used.

However, in small-diameter butterfly valves, the valve body is formed into a nearly cylindrical shape except for the part where the valve stem is attached, and in particular, as mentioned above, there is no protrusion for forming the bolt insertion hole. It's normal.

This is particularly true for small butterfly valves, and is unavoidable when the intention is to simplify the configuration and reduce costs; It is inevitable that it will be difficult to position and install it.

This is because such a small butterfly valve is placed in a fixed position in a pipeline, and when the opposing flanges that hold the valve are fastened together with bolts, the valve itself has both sides covered by the flanges. This is because the outer peripheral portion of the valve body does not come into contact with any other object by simply being firmly clamped.

In other words, when the gap between the flanges at the end of the pipe is slightly expanded and the butterfly valve is installed in the gap, when the pipe and the valve are fastened together with the tightening bolts, the end faces of both sides of the valve must be tightened. A gasket is placed between the and the flange surface to prevent fluid from leaking from this part, or
It is relatively easy to prevent leakage between the valve and the pipe by extending both ends of the seat ring, which is attached to the inner surface of the valve body and acts as a seal against the valve plate, to the outside of both ends of the valve and crimping these parts. One cause is the presence of flexible material between the flange and the sides of the valve.

For this reason, even if the position of the valve with respect to the pipe is determined accurately at the beginning, the valve may become damaged due to the presence of gaskets, protruding parts of the seat ring, etc. while sequentially tightening multiple bolts along the circumference. This is because the position relative to the pipe cannot be avoided due to slight movements in accordance with the rules.

The purpose of this invention is to provide a centering member that can easily and accurately center a small-diameter butterfly valve without causing the above-mentioned defects when it is installed in a pipeline. It is something.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing a state in which a wafer-type small butterfly-shaped valve having a nearly cylindrical valve body 2 is held between opposing flanges Fl and F2 at adjacent pipe ends of a piping system, as shown in the figure. If the central axis C1 of the pipeline does not coincide with the central axis C2 of the valve, the above-mentioned problems will occur.

As is clear from Fig. 2, each flange Fl, F2 has an appropriate number of bolt insertion holes along the circumference, and a bolt is loosely fitted into each hole (in the one shown). 4), tighten with nuts not shown.

At this time, if the valve 1 is placed between both flanges, this valve will be held between the flanges F1 and F2.

As mentioned earlier, in order to align the center axes CI and C2 of the pipe and the valve between the flanges Fl and F2 of the valve 1, in this case, the design is indicated by the reference numeral 10 in FIG.
A centering member made of an elastic material such as rubber having appropriate elasticity is used as described in detail below.

The structure of the centering member 10 is clear from FIG.

That is, it is a polygonal cylinder having an appropriate number of longitudinally extending flat portions (five flat surfaces 12 to 16 in the illustrated example) on its outer surface and a through hole 11 inside.

The diameter of the through hole 11 is such that it can be smoothly attached to and removed from the fastening bolts B1 to B4, and the polygonal cylinder made of an elastic material will not be substantially deformed even when attached.

In addition, the distances d2t, d3, d5 and d6 from the center of the through hole 11 to the external plane parts 3.14, 15 and 16 are defined by JIS, DIN, A
According to the NSINS standard, when the valve is fixed in the correct position between the flanges, the outer surface of the valve body of the valve and the tightening bolt Bl
, B2, etc., so as to match various specified gaps between the surfaces.

Furthermore, in the embodiment shown in FIG. 3, a notch 18 is formed in one plane part 12 in the longitudinal direction thereof.

This notch may be formed on any flat surface, but as will be seen from the description below, it is convenient to form it on a thin portion extending from the circumferential surface of the through hole 11 to the outer surface.

As shown in FIG.
, B3, and a predetermined flat surface of the external flat portion is oriented in a direction where it comes into contact with the valve body of the valve to be installed.

Then, by arranging the valve so that the outer surface of the valve body is placed in contact with this flat portion, the central axis of the valve automatically assumes a position that coincides with the central axis of the pipeline.

By giving appropriate hardness to the centering member, the valve will not move from the specified position even when the bolts are tightened, so the valve can be easily fixed without the need for any centering adjustment work. .

How many centering members 10 are to be attached and to which bolts should be attached depends on the relative positional relationship between the valve and the tightening bolts, the number of bolts, etc. At the piping site, the tightening work will affect the valve position. You can freely set it so that the number of cases is as small as possible.

After fixing the valve 1 between the flanges, the centering member may be left as is, or it can be removed by grasping the member and pulling strongly to remove it from the part weakened by the presence of the notch 18. It can be torn apart and easily removed.

Of course, it is also possible to use a centering member that has been split in advance along the notch 18 and fitted into the bolt B1 or the like from the side thereof.

Since the centering member of this proposal has such a configuration,
By using an appropriate number of these, a small-diameter butterfly valve that does not have a centering bolt insertion hole on the outer periphery of the valve body can be easily and accurately fixed in place without the need for any centering adjustment. It is something that can be done.

Furthermore, the centering member of this proposal has a polygonal outer surface and a stiffness,
Since the distance from the center of the bolt insertion through hole 11 to each outer surface can be modified in various ways, it can be adapted to various types of valves.

FIG. 4 is an end view of a centering member showing another embodiment of the present invention, in which the outer surface of the centering member has trough-like concave surfaces 12', 13',
14'l, 5' and 16', and the shortest distance from the center of the through hole 11 to each concave surface is respectively in the case of various combinations of valves and pipes.

The distance between the outer circumferential surface of the valve body and the bolt surface corresponds to the distance between the valve body and the bolt surface.

With this configuration, when the centering member 10 is inserted into the bolt 81 etc. and the outer surface 12' etc. of the centering member 10 is brought into contact with the outer circumferential surface of the valve body, the arc-shaped protrusion on the outer circumferential surface of the valve and the centering member It can be easily understood that since the valve body engages with the concave surface, the valve body can be positioned more accurately than when the valve body contacts the flat portion shown in FIG.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a small butterfly valve sandwiched between pipe end flanges, Figure 2 is a perspective view showing how the centering member of the present invention is used, and Figure 3 is a centering diagram of the present invention. FIG. 4 is a perspective view showing the structure of the members and an end view showing another embodiment of the present invention. In the figure, numerals 1...Butterfly valve, 2...
Valve body, 3... Valve plate, 10, 20...
Centering member, 12 to 16... Flat part, 12
' to 16'... Concave portion, 11...
Through hole, Fl, F2...Flange, B1 to B4...Tightening bolt.

Claims (3)

[Scope of utility model registration request] (1) It is made of an elastic material such as rubber with appropriate elasticity, has a through hole in which a pipe flange joining tightening bolt is inserted, and the outer surface is wrinkled at different distances from the through hole. A centering member for a butterfly-shaped valve formed on multiple surfaces. (2) The centering member for a butterfly valve according to the above item 1, wherein one of the surfaces forming the outer surface is provided with a notch in the longitudinal direction. (3) The centering member for a butterfly valve according to item 1, wherein each of the plurality of surfaces forming the outer surface is formed into a gutter-like concave surface extending in the longitudinal direction.