JPH0650448A - Connecting device of valve to piping - Google Patents

Abstract

PURPOSE:To facilitate the connection of a valve to a piping, simplify the alignment between the two, and execute the alignment with high accuracy. CONSTITUTION:Fitting surfaces 1a, 2a of a valve box 1 and a piping 2 are made flat, and an annular recess 4 for fitting an O-ring 5 is formed on the fitting surface 1a on the valve box 1 side, and at the same time, annular hubs 6, 7 having external surfaces 6a, 7a which are down-hill inclined outward in the radial direction integrated to the respective outer circumferential parts of the valve box 1 and the piping 2. On the other hand, a pair of couplings 8, 8 which are circumferentially divided into two and can be fitted from the outside in the radial direction across the annular hubs 6, 7 are pulled mutually inward in the radial direction by being tightened by means of a bolt 9 and a nut 10 at the respective end parts, and auxiliary alignment adjusting bolts are screwed in the vicinity of the respective end parts of the coupling 8, 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve / pipe connecting device which is applied when connecting various valves such as a butterfly valve and a ball valve to a pipe.

[0002]

2. Description of the Related Art Conventionally known types of connection between a valve such as a butterfly valve and piping are a flange connection type and a wafer connection type. In the flange connection type, as shown in FIG. 3, a ring-shaped packing 33 is interposed between the mating surfaces of the cylindrical valve box 31 and the pipe 32.
Flange 31a on the valve box 31 side and flange 3 on the pipe 32 side
2a is fastened by bolts 34 and nuts 35 at a plurality of positions in the circumferential direction.

Further, in the wafer connection type, as shown in FIG. 4, a valve box 31 is arranged between two pipes 32, 32, and a mating surface on both sides of the valve box 31 and two pipes 32, 32 are joined together. The packings 33, 33 are respectively provided between the flanges 32a, 3 of the above-mentioned pipes 32, 32.
2a are fastened together by long bolts 34 and nuts 35.

However, according to the connecting device having the above-described structure, it is necessary to use a large number of bolts 34 and nuts 35 for tightening in both the flange connection type and the wafer connection type. Not only is the tightening time consuming and the connection work is very inefficient, but the bolt 34 and the nut 35 are tightened in the axial direction, so that the valve box 31 and the pipe 32 have a relative radial direction. A slippage is likely to occur, and it takes a lot of time to center the both 31 and 32.

Therefore, conventionally, as shown in FIG. 5, a labor-saving type using a coupling (clamp) has already been proposed. In this embodiment, the spigot 36 is formed on each mating surface of the valve box 31 and the pipe 32, and the O-ring 37 is interposed at the spigot 36.
On the outer periphery of the valve box 31 and the pipe 32 on the mating surface side,
An inclined surface 38a having a descending slope toward the outside in the radial direction,
The annular hubs 38 and 39 each having 39a are integrally formed, and a pair of semicircular couplings 40 and 40 having a substantially portal-shaped cross section which are divided into two in the circumferential direction are straddled over the hubs 38 and 39. In addition to being fitted from the outer side in the radial direction, the respective end portions of both couplings 40, 40 are tightened so as to be pulled inward in the radial direction by a bolt 41 and a nut 42, respectively. With such a configuration, there are advantages that the tightening points of the bolt 41 and the nut 42 are reduced and the centering can be performed relatively easily through the spigot 36.

[0006]

However, according to the connecting device having the structure shown in FIG. 5, since the spigot 36 is formed on the mating surface between the valve box 31 and the pipe 32, the pipe 32 may be twisted. If the core is misaligned, it becomes difficult to connect the valve box 31 and the pipe 32 in close contact with each other. Further, since the O-ring 37 is provided at the part of the spigot 36, there is a problem that the O-ring 37 is easily removed during the assembling, and the assembling work is difficult in order to prevent the O-ring 37 from coming off.

The present invention has been made in order to solve the above-mentioned conventional problems. The connection work can be facilitated and the centering can be easily performed regardless of the twist of the pipe.
Moreover, it is an object of the present invention to provide a connection device between a valve and a pipe that can perform centering with high accuracy.

[0008]

In order to achieve the above object, a connecting device for a valve and a pipe according to the present invention is provided with a radially outer portion on an outer peripheral portion on each mating surface side of a cylindrical valve box and a pipe. Ring-shaped hubs each having a slanted outer surface that slopes downward toward one side are integrally formed, and divided into two in the circumferential direction so that they can be fitted from the outer side in the radial direction across both of these ring-shaped hubs. In the pair of couplings having a substantially gate-shaped cross section, two slanting surfaces that face the slanted outer surfaces of the annular hubs are formed. The two slanting surfaces of each of these couplings are connected to the annular hubs of the valve box and the piping. In a connecting device for a valve and a pipe, which is provided with a fastener for abutting against each of the inclined outer surfaces and pulling the pair of couplings toward each other inward in the radial direction, the both mating surfaces are formed as flat surfaces. , One of the flat mating surfaces, A ring-shaped recess for fitting a seal ring around the center is formed, and radial screw holes are formed in the vicinity of both circumferential ends of at least one of the pair of couplings. An auxiliary centering screw member for screwing a relatively small radial displacement between the box and the pipe is screwed together.

[0009]

According to the connecting device having the above-mentioned structure, the cylindrical valve box and the respective annular hubs of the pipe are arranged from the radially outer side to the inner side by using a pair of couplings which are formed by being divided into two in the circumferential direction. Since both are connected by tightening toward, the number of tightening points is reduced to only two, and the centering becomes easy. In particular, since the respective mating surfaces of the valve box and the pipe are formed as flat surfaces, even if the pipe is twisted, the connection with the valve box can be easily performed. Further, since the seal ring is fitted in the annular recess of the mating surface, there is no fear that the seal ring will fall off during assembly, and further,
By operating the auxiliary alignment screw member screwed in the screw holes near both ends of the coupling in the radial direction,
Fine adjustment of the centering is possible and the centering accuracy can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are a side view and a half sectional front view showing a connecting device between a valve and a pipe in an embodiment of the present invention, respectively.

In FIGS. 1 and 2, 1 is a cylindrical valve box, 2 is a pipe connected to the valve box 1, and mating surfaces of both 1 and 2 are flat surfaces 1a and 2a. . An annular groove 4 around the axis is formed in the mating surface 1a on the valve box 1 side, and an O-ring 5 as a seal ring is fitted in the annular groove 4.

Each mating surface 1 of the valve box 1 and the pipe 2
On the outer peripheral surfaces on the a and 2a sides, annular hubs 6 and 7 having slanted outer surfaces 6a and 7a having a downward slope toward the radially outer side are integrally formed. 8 and 8 are 2 in the circumferential direction
A pair of semi-circular couplings each having a cross-section and having a substantially gate-shaped cross-section, and inner surfaces on both sides in the width direction of the couplings 8, 8 are inclined inner surfaces corresponding to the inclined outer surfaces 6a, 7a. 8a and 8b, and can be fitted from the outside in the radial direction on the outer peripheral sides of the hubs 6 and 7 while straddling them.

Reference numerals 9 and 10 denote bolts and nuts for tightening the respective one end portions 8a, 8a and the other end portions 8b, 8b of the couplings 8, 8, respectively. Bolt holes (screw holes) 11 extending in the radial direction are formed near both ends 8a, 8b of the one coupling 8, respectively, and the valve box 1 and the pipe 2 are formed in each of the bolt holes 11. A bolt 12 is screwed as an auxiliary aligning screw member for relatively slightly displacing and in the radial direction.

According to the connecting device having the above construction, the O-ring 5 is fitted in the annular recess 4 of the mating surface 1a on the valve box 1 side so that the mating surface 1a of the valve box 1 is mated on the pipe 2 side 2a. However, at this time, even if the pipe 2 is twisted or misaligned, the mating surfaces 1a and 2a are formed as flat surfaces, so that the valve box 1 and the pipe 2 are connected to each other. It is possible. Moreover, since the O-ring 5 is fitted in the groove 4,
There is no danger of falling off during connection work.

In this state, when the pair of couplings 8 and 8 are fitted from the outside in the radial direction while straddling the hub 6 on the valve box 1 side and the hub 7 on the pipe 2 side, the hub 6 is fitted. , 7 on the respective inclined outer surfaces 6a, 7a of the coupling 8 on the inclined inner surfaces 8a, 8b.
Abut. Then, attach both bracket rings 8 and 8 to the bolt 9
When tightened by the nut 10 and the nut 10, the slanted inner surfaces 8a, 8b are brought into pressure contact with the slanted outer surfaces 6a, 7a on the hub 6, 7 side.
The mating surfaces 1a and 2a of the pipe 2 strongly adhere to each other. Moreover, due to the above-mentioned tightening, a force inward in the radial direction is applied to the valve box 1 and the pipe 2 over substantially the entire circumference. In other words, the tightening of the couplings 8 and 8 with the set of bolts 9 and nuts 10 will automatically align and connect the two.

Further, both ends 8a, 8 of the coupling 8 are
If the screwing amounts of the auxiliary centering bolts 12, 12 are adjusted in the vicinity of b, the valve box 1 and the pipe 2 can be moved relative to each other in the radial direction substantially along the split opposing surfaces of the pair of couplings 8, 8. Since the displacement can be finely adjusted, the centering accuracy can be set high.

Of course, the auxiliary aligning bolts 12 and 12 are
May be provided also on the other coupling 8 side.

[0018]

As described above, according to the present invention, by making the mating surface of the cylindrical valve box and the pipe a flat surface, the two can be joined regardless of the twist of the pipe, Since the seal ring is fitted in the recess of the box-side mating surface, the seal ring does not fall off during connection. In particular, by simply tightening a pair of couplings fitted over the hub on the valve box side and the hub on the piping side so as to draw them to each other with two bolts and nuts, The centering can be automatically performed, and the centering accuracy can be improved by adjusting the screwing amount of the auxiliary aligning screw member screwed into the coupling.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a connecting device between a valve and a pipe according to an embodiment of the present invention.

FIG. 2 is a half sectional front sectional view showing a connecting device between a valve and a pipe in the same embodiment.

FIG. 3 is a vertical cross-sectional view of a main part showing a conventional connection structure between a valve and a pipe.

FIG. 4 is a vertical cross-sectional view of a main part showing another conventional connection structure between a valve and a pipe.

FIG. 5 is a vertical cross-sectional view showing another conventional connection structure between a valve and a pipe.

[Explanation of Codes] 1 valve box 1a, 2a mating surface 2 connecting pipe 4 annular recess 5 O-ring (seal ring) 6,7 hub 6a, 7a inclined outer surface 8 coupling 8a, 8b coupling end 9 bolt 10 Nut 11 Bolt hole (Screw hole) 12 Auxiliary alignment bolt (Auxiliary alignment screw member)

Claims (1)

[Claims] 1. An annular hub having an inclined outer surface having a downwardly sloping slope toward the outside in the radial direction is integrally formed on the outer periphery of each mating surface side of a cylindrical valve box and a pipe, respectively. A pair of couplings, which are divided into two in the circumferential direction so as to be capable of being fitted from outside in the radial direction across both annular hubs, and which are opposed to the inclined outer surfaces of the above annular hubs. And two slanted surfaces of each of the couplings are brought into contact with the slanted outer surfaces of the valve box and the annular hub of the pipe to direct the pair of couplings inward in the radial direction. In a device for connecting a valve and a pipe, which is provided with a tightening tool for pulling, both mating surfaces are formed as flat surfaces, and one flat mating surface is formed with an annular recess for fitting a seal ring around an axis. With
Threaded holes extending in the radial direction are formed in the vicinity of both circumferential ends of at least one of the pair of couplings, respectively.
A connecting device for a valve and a pipe, wherein an auxiliary centering screw member for relatively slightly displacing the valve box and the pipe in the radial direction is screwed into these screw holes.