JPH0144863Y2 - - Google Patents

Description

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

(Prior Art) When attaching a butterfly valve to a pipeline, it is necessary to align the central axes of the butterfly valve and the piping. If the axes of the two do not match, fluid leakage will occur.

In order to align the center axis of the butterfly valve and the piping, insert the piping bolt that holds the butterfly valve and tightens the piping flange into the bolt hole formed in the fin that protrudes radially from the outer periphery of the butterfly valve body. It is conventionally known to perform centering between the two.

Conventionally known butterfly valves generally have centering fins 2 with bolt holes 1 formed on the top and bottom of the main body 3, as shown in FIG. When the butterfly valves are formed one above the other, the weight of the entire butterfly valve increases, making it inconvenient to handle. A model in which the centering fin 2 is formed only on the upper part of the main body 3 has also been proposed, but in this case, when installing a butterfly valve with the actuator located on the side, the centering fin 2 is in the center and the centering fin 2 is moved downward by weight. There was a problem that the centering could not be performed accurately due to misalignment.

Japanese Utility Model Publication No. 59-27572 discloses a butterfly valve in which an adapter for inserting a bolt is fixed to the outer periphery of the main body, and the centering of the butterfly valve is performed by inserting the adapter and the bolt.

(Problem to be solved by the invention) However, in the case of such a known invention,
Since the adapter is arranged at a 180° symmetrical position orthogonal to the center of the valve body rotation axis passing through the valve stem, when it is installed in a piping system with the valve body rotation axis horizontally, that is, in a horizontal piping mode. However, it has the disadvantage that accurate centering is difficult.

In other words, when a butterfly valve is inserted between piping flanges, it has a tendency to descend due to its weight, so when horizontal piping is used as described above, only the upper adapter contacts the bolt, and the lower adapter The adapter ends up not contributing to centering.
For this reason, the bolt hole formed in the adapter cannot be made into an oval shape that extends in the radial direction (if it is made into an oval shape, the entire butterfly valve will descend by that length, making accurate centering impossible). This has the extremely large inconvenience of not being able to adapt to multiple piping flange standards. This means that an adapter must be fixed to the main body in advance for each piping flange, resulting in serious disadvantages in terms of manufacturing costs and inventory control.

Further, since a butterfly valve has a heavy actuator attached to the tip of one valve stem, the weight of the entire valve is not uniform, and the driving valve stem side is heavier than the other side. Therefore, when installing a butterfly valve in horizontal piping, the installed butterfly valve has a tendency to tilt due to the unevenness of the weight, making it difficult to hold it horizontally.゜If the adapter is placed in a symmetrical position, it will not be able to cope with the tilting caused by the uneven distribution of the weight of the butterfly valve, and the butterfly valve will inevitably tilt by the gap between the bolt hole and the bolt, making it horizontal. It has the disadvantage that it does not become

(Means for Solving the Problems) The means adopted by this invention to solve the above problems is to provide centering points adjacent to each of the valve stem cylinders extending outward from diametrically opposed positions on the outer periphery of the main body. Fins are integrally formed with the main body, one centering fin is arranged at 180° symmetrical positions around the axis of the main body, and oval bolt holes extending in the radial direction of the main body are opened. It is characterized by being

(Function) Centering fins are formed at 180° symmetrical positions on the top and bottom of the main body to reduce weight, support the weight of the butterfly valve in a well-balanced manner, and improve the degree of freedom in the mounting direction of the butterfly valve.

(Embodiment) A preferred embodiment of this invention will be described below with reference to FIGS. 1 and 2. In the figure, 10
is a cylindrical butterfly valve body, within which a disc-shaped valve body 11 is rotatably supported. A seat ring 12 is fixed to the inner peripheral surface of the main body 10 and is made of rubber or synthetic resin, and the outer peripheral edge of the valve body 11 is seated on the seat ring to shift to the valve closing position. 1
3 is an actuator that rotationally drives the valve body 11.

Reference numeral 14 denotes centering fins formed one each on the upper and lower parts of the main body 10, which are valve stem cylinders that extend outward from diametrically opposed positions on the outer peripheral surface of the main body to pivotally support the valve stem. 17, 18, and the main body 1
It is formed integrally with the main body at a 180° symmetrical position centered on the zero axis. A bolt hole 15 through which a piping bolt 16 is inserted is bored in the centering fin 14. The bolt holes 15 preferably have an oval shape extending in the radial direction of the main body 10, as shown in FIG. 1, to accommodate a plurality of different flange standards.

(Effect of the invention) According to the butterfly valve centering device of this invention, centering fins are integrally attached to the main body adjacent to the valve stem cylinders extending outward from diametrically opposed positions on the outer periphery of the main body. The centering fins are arranged at 180° symmetrical positions with respect to the axis of the main body, and oblong bolt holes extending in the radial direction of the main body are drilled. Compared to the conventional butterfly valve shown in Figure 3, the weight is reduced and it is lighter, making it possible to improve workability in manufacturing, installing, and transporting the valve. Centering fins are arranged at 180° symmetrical positions, and these fins are integrally formed with the main body, so even when the butterfly valve is placed horizontally in correspondence with horizontal piping, it can be placed in the opposite position. The two fins on the fins can support the weight of the butterfly valve in a well-balanced manner.As a result of this well-balanced support, even if the bolt holes drilled in the fins are oval shapes extending in the radial direction, the butterfly valve There is no risk of it falling or tilting due to weight, and it becomes possible to appropriately comply with multiple piping flange standards. Therefore, it can be applied to both vertical piping and horizontal piping, and the degree of freedom in the mounting direction of the butterfly valve can be improved.

[Brief explanation of the drawing]

Figure 1 is a front view of the butterfly valve body according to this invention, Figure 2 is a perspective view showing how it is attached to piping,
FIG. 3 is a front view of a conventional butterfly valve. 10... Main body, 11... Valve body, 12... Seat ring, 13... Actuator, 14... Centering fin, 15... Bolt hole, 16... Piping bolt.

Claims (1)

[Scope of utility model registration request] Centering fins are integrally formed with the main body adjacent to respective valve stem cylinders extending outward from diametrically opposed positions on the outer periphery of the main body, and the centering fins are arranged at an angle of 180° about the axis of the main body. 1. A centering device for a butterfly valve, characterized in that one bolt hole is provided at each symmetrical position, and an oblong bolt hole extending in the radial direction of the main body is bored.