JPH0560265A - Dew condensation preventing device for valve operation part - Google Patents

Abstract

PURPOSE:To prevent the dew condensation and icing on the inside and outside of the operation part of a valve in which a low-temperature fluid mainly flows by installing a heat insulating member between the valve and the operation part. CONSTITUTION:A heat insulating member 3 formed of an insulator such as plastics or asbestos is provided to insulate the heat between a valve 1 and an operation part 2. When the temperature of an operation part mounting flange 1a becomes low by a low-temperature fluid flowing in the valve 1, the temperature of the mounting flange 2a of the operation part 2 is never reduced. Therefore, dew condensation and icing are never caused on the inside and outside of the operation part 2, and the control impossibility and the operation impossibility resulting from the rusting by the water formed by melting the condensed dew and the ice are never caused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dew condensation preventing device for an operating part such as a gear operating device for a valve such as a butterfly valve in which a low temperature fluid flows and a lever handle operating device, which has a simple structure and an operating part. The present invention relates to a dew condensation prevention device for a valve operation unit such as a butterfly valve, which has a large effect of preventing dew condensation and can easily maintain the heat of piping including the valve.

[0002]

2. Description of the Related Art A valve in which a low temperature fluid such as a liquefied gas flows is cooled by this fluid to a low temperature, which causes dew condensation on the surface of the valve and further freezing. In this way, in order to prevent the cold heat loss of the fluid and the deterioration of the piping environment due to dew condensation or freezing, heat insulation work is generally performed to cover the pipes and valves with a heat insulating material to insulate the outside air. But,
The cooling action of the low-temperature fluid does not stop at the valve, but extends to the gear operating device and lever handle operating device, causing condensation and icing not only on the outer surface of these valve operating parts but also on the inside, which makes operation impossible. However, there was a problem in that the water generated by melting these caused corrosion and rendered inoperable.

In order to solve this problem, various measures have heretofore been taken. 5 and 6 are partial sectional views showing the example. In FIG. 5, reference numeral 21 denotes a yoke portion of the valve, which is formed by arranging pipes 21a and 21b having different diameters concentrically and welding them to the operating portion mounting flange 22. Note that stainless steel pipes are generally used as the pipes 21a and 21b. 23 is an operating device, and 2
3a is a mounting flange, 24 is a bolt, and the operating portion mounting flange 22 and the mounting flange 23a
Are in direct contact with and fastened by bolts 24. Incidentally, 25 is a stem of the valve. In this structure, the space 21c between the pipes 21a and 21b is heat-insulated so that the pipe 21a is close to the outside air temperature, and it is not likely that dew condensation or icing will occur on its surface. However, the temperature of the pipe 21b is close to the temperature of the cryogenic fluid inside the valve, and the degree of the pipe 21b is relatively small because the cross-sectional area of the pipe 21b is small.
It cannot be said that the operating device 23 is not lowered in temperature via the mounting flange 23a, causing dew condensation or freezing. However, the major drawback of this structure is that it is expensive because it is a welded structure, and it is easily deformed or damaged by residual welding stress and easily corroded.

The structure shown in FIG. 6 has a valve body 26.
Is made of resin, and a metal cored bar 26a is buried in the resin portion 26b for reinforcement. In this structure, the low thermal conductivity of the resin prevents dew condensation or icing on the outer surface of the valve, prevents the temperature of the operating portion mounting flange 26c from decreasing, and also prevents the temperature of the operating device attached thereto. .. However, this structure has a problem that since it is made of resin, it has low strength and is easily damaged, and that it cannot be used at a temperature that is too low due to the limitation of the operating temperature.

[0005]

DISCLOSURE OF THE INVENTION The dew condensation preventing device for a valve operating portion of the present invention is intended to solve the problems of the above-mentioned conventional techniques, and its object is to:
It is capable of withstanding long-term use, has excellent durability, and is also excellent in strength, so that it is possible to easily perform heat insulation work.

[0006]

In order to achieve the above-mentioned object, the dew condensation preventing device of the valve operating portion of the present invention is constructed as follows. A heat insulating member made of a heat insulating material was mounted between the valve and the operating portion. In this case, the heat insulating material may be a material mainly composed of plastic or asbestos, and by mounting the heat insulating member, an annular groove may be formed between the valve and the operating portion, or the heat insulating member may be formed. It is advisable to mount an annular projection plate on the valve side of, or form an annular projection between the valve and the operating portion by the heat insulating member.

[0007]

Since the dew condensation preventing device of the valve operating portion of the present invention is constructed as described above, the valve which has been cooled to a low temperature by the low temperature fluid by the heat insulating member formed between the valve and the operating portion is formed of a heat insulating material. This prevents the temperature drop of the operating part due to the operating part mounting flange. For this reason, dew condensation or icing does not occur inside or outside the operation portion, and thus the operation cannot be performed, or the dew or frost does not corrode due to the melted water to make it inoperable. Therefore, there is no need for the valve to have a special structure or made of a special material, which is economical and highly reliable.

When the heat insulating material is mainly made of plastic or asbestos, the heat insulating effect is large, and the material is easily available and inexpensive.

Next, when an annular groove or an annular projection is formed between the valve and the operating portion by mounting a heat insulating member or by mounting a ring-shaped projection plate on the valve side of the heat insulating member, these ring-shaped rings are formed. By using the groove or the annular protrusion, the heat insulating work for covering the pipe including the valve with the heat insulating material to insulate it from the outside air can be performed easily and easily.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a dew condensation preventing device for a valve operating portion of the present invention will be described with reference to the drawings. 1 to 4 are
FIG. 1 is a partial front view showing an embodiment of a dew condensation preventing device for a valve operating portion according to the present invention.
Is a valve (yoke) such as a butterfly valve, 2 is an operating portion, 3 is a heat insulating member, 1a is an operating portion mounting flange of the valve 1, 2a is an operating portion 2 mounting flange, and 4 is a mounting bolt. In FIG. 1, 5 is a handle, and 6 in FIG. 3 is an annular projection plate. In any of the embodiments shown in FIGS. 1 to 4, the heat insulating member 3 is
It is mounted between the operating portion mounting flange 1a of the valve 1 and the mounting flange 2a of the operating portion 2. Insulation member 3
Is made of plastic or asbestos based materials.

In the embodiment shown in FIG. 2, by mounting the heat insulating member 3, an annular groove 7 is provided between the operating portion mounting flange 1a of the valve 1 and the operating portion 2 mounting flange 2a.
Are formed. In the embodiment shown in FIG. 3, the annular protruding plate 6 is attached to the heat insulating member 3 on the valve 1 side. Figure 4
In the embodiment shown in FIG. 3, the heat insulating member 3 forms an annular protrusion between the valve 1 and the operating portion 2.

Next, the operation will be described based on the embodiment shown in FIGS. Since the heat insulating member 3 formed of a heat insulating material such as plastic insulates the valve 1 from the operating portion 2, even if the operating portion mounting flange 1a becomes low in temperature due to the low temperature fluid flowing in the valve 1, The temperature of the mounting flange 2a of No. 2 does not decrease. Therefore, dew condensation or freezing does not occur inside or outside the operation unit 2, and thus the operation cannot be performed, or the dew or freezing ice melts water to cause rusting and thus disables operation.
Therefore, there is no need to make the valve 1 into a special structure or a special material, which is economical and highly reliable.

When the heat insulating material used for the heat insulating member 3 is mainly made of plastic or asbestos, the heat insulating effect is great, and the material is easily available and inexpensive. Next, the annular groove 7 is formed by mounting the heat insulating member 3 as shown in FIG. 2, or the annular protruding plate 6 is mounted on the valve 1 side of the heat insulating member 3 as shown in FIG. If an annular projection is formed on the heat insulating member 3, the heat insulation work for covering the pipe including the valve 1 with a heat insulating material to insulate it from the outside air by using these annular grooves 7 and the annular projection can be performed easily and easily. It can be carried out. Cross-section 8 indicated by a two-dot chain line in FIG.
Is an example of this thermal insulation coating.

[0014]

As described above, the dew condensation preventing device of the valve operating portion such as the butterfly valve according to the present invention has a simple structure to prevent the temperature of the operating portion from being lowered by the low temperature fluid, and the inoperability due to the dew condensation or the freezing or those It is an extremely economical, highly effective, and highly reliable device that prevents the occurrence of corrosion due to molten water and the malfunction thereof. Furthermore, the piping including the valve is covered with a heat insulating material so that the heat insulating work for insulating from the outside air can be easily performed.

[Brief description of drawings]

FIG. 1 is a partial front view showing an embodiment of a dew condensation preventing device for a butterfly valve operating portion according to the present invention.

FIG. 2 is a partial front view showing an embodiment of a dew condensation preventing device for a butterfly valve operating portion according to the present invention.

FIG. 3 is a partial front view showing an embodiment of a dew condensation preventing device for a butterfly valve operating portion according to the present invention.

FIG. 4 is a partial front view showing an embodiment of a dew condensation preventing device for a butterfly valve operating portion according to the present invention.

FIG. 5 is a partial cross-sectional view of a butterfly valve showing a conventional example.

FIG. 6 is a partial cross-sectional view of a butterfly valve showing a conventional example.

[Explanation of symbols]

 1 Butterfly valve 2 Operation part 3 Thermal insulation member 6 Annular projection plate 7 Annular groove

Claims (5)

[Claims] 1. A dew condensation preventing device for a valve operating portion, characterized in that a heat insulating member made of a heat insulating material is mounted between the valve and the operating portion. 2. The dew condensation preventing device for a valve operating part according to claim 1, wherein the heat insulating material is a material mainly composed of plastic or asbestos. 3. The dew condensation preventing device for a valve operating portion according to claim 1, wherein an annular groove is formed between the valve and the operating portion by mounting the heat insulating member. 4. The dew condensation preventing device for a valve operating portion according to claim 1, wherein an annular projection plate is attached to the valve side of the heat insulating member. 5. The dew condensation preventing device for a valve operating part according to claim 1, wherein the heat insulating member forms an annular protrusion between the valve and the operating part.