JP3576445B2 - valve - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve, and more particularly, to a valve, which is attached between pipes connected using a connecting member arranged on the basis of a pipe axis, and has a protruding portion corresponding to an arrangement position of the connecting member. The present invention relates to a valve capable of performing axial alignment with a pipe by supporting the projecting portion on the connection member.
[0002]
[Prior art]
For example, when a valve such as a butterfly valve is installed between the flange joints of the pipe, if the axis of the valve and the pipe are misaligned, this may cause cavitation or if the amount of misalignment of both axes is large. Has various adverse effects, such as the rotating valve valve interfering with the piping.
As shown in FIGS. 4 and 5, there are bolts A2 and A3 provided with bolt insertion holes 401 and ribs 501 on the valve side corresponding to the flanges of the pipes, as shown in FIGS.
However, in the valves A2 and A3 as shown in FIGS. 4 and 5, unless the bolt inserted in the bolt insertion hole 401 or the bolt 502 supporting the rib 501 is removed, the valve is pulled out from between the flange joints of the pipe. I can't.
When the valves A2 and A3 can be pulled out, the valves A2 and A3 are no longer supported. Therefore, even if the weight of the valves is not so large, it can be held by a plurality of workers or suspended by a suspension device such as a crane. Otherwise it is dangerous.
On the other hand, Japanese Patent Publication No. 47-9029 discloses a radial rib protruding outward along the outer periphery of a cylindrical valve body for accommodating a valve body, and connecting the rib to a pipe. A valve is described in which a valve and a pipe can be axially aligned by being supported by bolts.
The publication discloses that a plurality of bolts arranged along a circle centered on the axis of the pipe regulate the position of the rib, and thus the relationship between the axis of the valve and the pipe. Since the valve is supported only by the lower bolts, it is considered that mounting and pulling out operations can be performed easily and safely.
[0003]
[Problems to be solved by the invention]
However, even if the valve described in the above publication is aligned with a pipe using a rib, it is considered that the alignment accuracy is insufficient.
In order to obtain sufficient alignment accuracy, it is necessary to form the rib with high accuracy. Since the outer diameter of the rib is circular, rotary cutting is appropriate in terms of accuracy and cost.
However, in the valve described in the above publication, a rib serving as a reference for axial alignment is provided at the center of the valve main body that accommodates the valve element. Since a boss for accommodating the valve stem is provided in this portion, when the valve is rotated, the boss and the cutting blade interfere with each other.
For this reason, it is difficult to process the rib by rotary cutting. When a rib is provided in the center of the valve body as in the valve described in the above publication, it is necessary to form the rib by molding such as casting. Become.
Since the accuracy of the ribs obtained by molding is much lower than the accuracy required for the alignment with the piping, even if the alignment with the piping is performed using the ribs located at the center of the valve body, the accuracy is still low. Insufficiency is inevitable.
Further, when the ribs are formed by molding such as casting, a mold for molding a valve is required according to the specifications of the flange joint of a large number of pipes, which leads to an increase in cost.
In order to solve the problems in the prior art, the present invention improves a valve, and is mounted between pipes connected using a connecting member arranged with reference to the axis of the pipe. A valve having a protruding portion corresponding to an arrangement position, wherein the connecting member supports the protruding portion so that the axis can be aligned with a pipe. By cutting the entire circumference of the valve end, which has a contact surface with the flange joint, by cutting, it is possible to ensure safety and workability when attaching to and removing from the pipe, and with high accuracy. It is an object of the present invention to provide an inexpensive valve that can perform the axial alignment.
[0004]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention has a projecting portion which is attached between pipes connected using a connecting member arranged on the basis of the axis of the pipe and corresponds to an arrangement position of the connecting member. A valve which is capable of performing axial alignment with a pipe by supporting the projecting portion on the connecting member, wherein the projecting portion forms a contact surface with a flange joint of the pipe. The valve is formed by cutting the entire periphery of the end portion by cutting.
In the valve according to the present invention, the projecting portion serving as a reference when the shaft is aligned with the pipe is formed by cutting the entire periphery of the valve end portion forming the contact surface with the flange joint of the pipe. There is no boss for accommodating the valve stem all around the valve end, so there is no problem in performing cutting. If formed by cutting, it is possible to form the protruding portion with high processing accuracy, and it is possible to improve the alignment accuracy with the pipe. In addition, it is not necessary to prepare a large number of molds for valve molding according to the specifications of the flange joint of the pipe, and the manufacturing cost can be reduced.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiment is a specific example of the present invention and does not limit the technical scope of the present invention. FIG. 1 is a diagram showing a schematic configuration of a valve according to an embodiment of the present invention.
The valve according to the present invention is mounted between pipes connected by using a connection member arranged on the basis of the axis of the pipe, and has a protruding portion corresponding to an arrangement position of the connection member. By supporting the protruding portion, the shaft can be aligned with the pipe. The characteristic feature is that the protruding portion forms a contact surface with the flange joint of the pipe. This is a point formed by cutting the entire periphery of the portion.
The valve A1 according to the embodiment of the present invention is a butterfly valve. As shown in FIGS. 1 and 2, an upper boss is provided along a rotation axis of the valve body with respect to the cylindrical valve body 101 so as to accommodate the valve body and a valve stem for rotating the valve body. The portion 102 and the lower boss portion 103 are formed to protrude.
In the valve A1, a plurality of (eight in this figure) bolts 1 (11 to 18) correspond to the connection members. These bolts 1 are inserted through insertion holes 22 provided in a flange joint 21 at the end of the pipe 2, and are used to connect the pipes 2 to each other. It is the insertion hole 22 that determines the position of each bolt 1. The center of each insertion hole 22 is arranged point-symmetrically with respect to the axis of the pipe along a circle centered on the axis of the pipe.
The center of an imaginary circle formed by connecting the innermost points of the bolts 1 inserted into these insertion holes 22 matches the axis of the pipe.
In the valve A <b> 1, the circular rib 3 having the largest outer diameter in the valve body 101 corresponds to the projecting portion. The center of the rib 3 coincides with the axis of the valve body 101, and the outer diameter of the rib 3 is determined to be equivalent to the above-mentioned virtual circle.
[0006]
When the valve A1 is mounted between the pipes 2, the axis of the valve A1 and the pipe 2 are aligned by bringing the rib 3 into contact with the bolt 1.
When the valve A1 is attached to the pipe 2 while the axes of the valve A1 and the pipe 2 are aligned, first, a space for arranging the valve A1 is secured between the pipes 2 and 2, and the lower side 4 The bolts 15 to 18 are temporarily fixed to the flange joint 21 using nuts.
In this state, as shown in FIG. 2, the valve A1 is lowered into the space between the secured pipes 2. At this time, the lower boss 103 is inserted between the bolts 16 and 17. When the valve A1 is further lowered, the rib 3 comes into contact with the bolts 15 to 18 and the valve A1 is supported by the bolts 15 to 18.
At this time, the position of the rib 3 is regulated by the bolts 15 to 18. Since the outer diameter of the rib 3 is a circle and the outer diameter is set to be equal to the virtual circle, the center of the rib 3 regulated by the bolts 15 to 18 is the center of the virtual circle formed by the bolts 15 to 18. Will be located at the center of The center of the rib 3 coincides with the axis of the valve body 101, and the center of the virtual circle coincides with the axis of the pipe 2, so that the axis of the valve body 101 coincides with the axis of the pipe 2. Will be.
After supporting the valve A1 with the bolts 15 to 18, the remaining bolts 11 to 14 are inserted into the insertion holes 22, and the valve A1 and the end face of the flange joint 21 of the pipe 2 are brought into contact with each other. The state in which the bolts 11 to 18 are fixed is the state shown in FIG. In this state, as shown in FIG. 3 in an enlarged manner, the contact surface 104 at the valve end and the flange joint 21 is in close contact with the flange joint 21, and the position where the rib 3 is regulated by the bolt 1 is also fixed.
Alignment of the valve A1 with the pipe 2 and mounting of the valve A1 between the pipes 2 are completed only by the above-described operations.
As described above, if the ribs 3 are supported by the bolts 1 so that the valve A1 and the pipe 2 are aligned with each other, there is no need to hold the valve A1 during mounting work by a plurality of operators or suspension devices. Therefore, the work convenience is excellent.
[0007]
If the upper bolts 11 to 14 are removed from the flange joint 21 and the bolts 15 to 18 are loosened, the valve A1 can be pulled out from between the pipes 2. At this time, since the valve A1 is supported by the remaining bolts 15 to 18, work safety when removing the valve A1 is also ensured.
By the way, what is important when aligning the axis of the valve A1 with the pipe 2 as described above is the positional relationship between the rib 3 and the bolt 1. If there is a deviation in this positional relationship, the accuracy of axis alignment also decreases accordingly.
Therefore, at least the ribs 3 must have sufficient processing accuracy. In order to obtain high processing accuracy, it is appropriate to determine the outer diameter of the rib 3 by lathe processing.
In this case, the valve A1 is rotated while pressing the cutting blade.
If the rib 3 is provided near the center of the valve body 101, the cutting tool interferes with the upper boss 102 and the lower boss 103, and cutting cannot be performed.
Although the ribs 3 can be formed by molding such as casting, the molding accuracy by casting is much lower than the required alignment accuracy. Also, depending on the specifications of the flange joint 21 of the pipe 2, a large number of molds for valve molding are required, which contributes to an increase in cost.
Therefore, in the valve A1 according to the embodiment of the present invention, the ribs 3 are provided on the entire periphery of the valve end portion 105 forming the contact surface 104 of the pipe 2 with the flange joint 21.
At the position of the valve end 105, there are no obstacles in the circumferential direction of the rib 3, so that it is possible to easily perform rotary cutting by applying a cutting blade and obtain high processing accuracy.
Also, if the ribs 3 are formed by rotary cutting, it is not necessary to prepare many molds for molding the valve, and the valve can be manufactured at low cost.
As described above, in the valve according to the embodiment of the present invention, the ribs are formed on the entire periphery of the end of the valve where the contact surface with the flange joint of the pipe is formed by cutting, so that the rib can be attached to the pipe or the pipe can be removed. This makes it possible to reduce the manufacturing cost while ensuring safety and work convenience when removing the wrench, and high alignment accuracy.
Note that the thickness of the rib 3 only needs to be strong enough to support the valve A1, and does not need to be made larger than necessary. The smaller the thickness, the shorter the processing time and the lower the cost.
The ribs 3 may be provided not only at one end of the valve body 101 but also at both ends.
[0008]
【The invention's effect】
As described above, according to the present invention, the projecting portion serving as a reference at the time of axial alignment with the pipe is formed by cutting the entire periphery of the valve end which forms the contact surface with the flange joint of the pipe. In addition, it is possible to reduce the manufacturing cost while securing safety and work convenience at the time of attaching to and removing from the pipe and high alignment accuracy.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a valve 1 according to an embodiment of the present invention.
FIG. 2 is a view for explaining the mounting operation of the valve 1.
FIG. 3 is a diagram for explaining the relationship between a rib and a pipe connection bolt in the valve 1.
FIG. 4 is a diagram showing an example A2 of a conventional valve.
FIG. 5 is a view showing another example A3 of a conventional valve.
[Explanation of symbols]
1 ... bolt 2 ... piping 3 ... rib

Claims (1)

Attached between pipes connected using a connecting member disposed with reference to the axis of the pipe, the connecting member has a projecting portion corresponding to the position of the connecting member, and the connecting member supports the projecting portion. This is a valve that can perform axis alignment with piping,
The valve according to claim 1, wherein the projecting portion is formed by cutting the entire periphery of a valve end forming a contact surface of the pipe with a flange joint.

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