JP3086913B2 - Anti-condensation valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve such as a butterfly valve and a ball valve, and more particularly to a dew-prevention valve for preventing dew condensation on the outer surface of the valve by a low-temperature fluid.

[0002]

2. Description of the Related Art A pipe through which a low-temperature fluid flows, such as cooling or freezing, or a relatively low-temperature water pipe, is cooled by the flowing low-temperature fluid, and condenses moisture in the air in contact with the low-temperature fluid. In order to prevent this, these pipes are covered with a heat insulating material so that the atmosphere does not come into direct contact with the low temperature part. This is the same for valves such as butterfly valves connected to these pipes. FIG. 6 is a front view showing a conventional example of a butterfly valve.

In FIG. 6, reference numerals 21 and 22 denote pipes, reference numeral 23 denotes a butterfly valve, reference numerals 24 and 25 denote pipe flanges for mounting the butterfly valve 23 between the pipes 21 and 22, and reference numeral 26 denotes pipe flanges 24 and 25. And 27 are nuts for tightening the bolts. Also, 28
Is an operating device, and the operating device 28 is a butterfly valve 2
3 is fixed to the upper end 23b of the valve stem 23a by bolts 29. Reference numeral 30 denotes a heat insulating material (two-dot chain line) covering the pipes 21 and 22, the pipe flanges 24 and 25, and the butterfly valve 23.

In the conventional butterfly valve 23, the valve shaft cylinder 23a is long in order to position the operation device 28 outside the heat insulating material 30, and as shown in FIG. The upper end 23b of the tube 23a is generally not covered with a heat insulating material or the like and is generally exposed to the atmosphere because it is difficult to cover.

[0005] For this reason, dew condensation occurs on the exposed upper end 23b of the valve stem 23a and the outer surface of the operating device 28, and the water droplets corrode these outer surfaces. To reduce the heat insulation effect. Further, the operating device 28 has a problem that heat is taken away not only through the valve shaft cylinder 23a but also through the output shaft of the operating device directly connected to the valve shaft, and the temperature becomes low.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention is state, and are intended to solve the problems related to condensation valve, such as a conventional butterfly valve used in the cryogen as described above has, as its object However, the product of the valve body
To achieve commonality and heat of the part exposed from the heat insulating material
Ru near possible to reliably prevent condensation to prevent conduction.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for mounting a valve shaft protruding from a valve body.
The valve stem is slightly projected from the valve body.
A mounting flange for mounting the operating device
On the other hand, a flange is formed at the upper and lower ends of the synthetic resin leg tube.
And the flange formed at the lower end of
Bolt to the attached flange, and
Place the operating device via the bolt on the formed flange
Configuration was adopted. In this case, the valve shaft and the output shaft of the operating device
Are connected by a coupling composed of a heat insulating structure,
Has an effect of preventing dew condensation. In addition, the above leg cylinder is made of a metal plate
Or a metal tube is integrated with the inside diameter of the base
By doing so, the strength is improved.

[0008]

Since the dew-prevention valve of the present invention is constructed as described above, the valve stem only slightly projects from the valve body. Are covered with the usual heat insulating material covering the valve body.
This form of threaded coupling at the connection of the valve shaft cylinder and the leg tube <br/> flange type, screw-type, union type, such as rotary torque
The same applies to any form that can withstand the shock . Next, since the leg barrel is made of synthetic resin, the heat conductivity is poor and the heat is hardly taken away by the valve stem barrel. There is no condensation on the outer surface of the case and the barrel exposed inside. In addition, the synthetic resin used for the leg cylinder preferably has not only poor thermal conductivity but also excellent strength, weather resistance and heat resistance.

Further, since the valve shaft and the output shaft of the operating device are connected by a coupling having a heat insulating structure, the operating device does not lose heat through the output shaft and the valve shaft, and does not become low in temperature. The type of the coupling may be any type such as a flange type or a cylindrical type, and the heat insulating structure may be any structure using a heat insulating material.

[0010] When the leg cylinder is formed integrally with the case of the operating device, a structure for connecting the leg cylinder to the case is not required, so that not only the material and assembly costs can be reduced, but also the molding cost is reduced. Further, when the leg cylinder is formed separately from the case, the conventional operating device can be used as it is or with a slight change. In this case, the case may be made of metal or synthetic resin.

If the base tube is formed by using a metal plate as a cored bar or integrally with the metal tube at the inner diameter, the base tube may be damaged by an operation reaction force applied to the base tube or an external force applied carelessly. There is no.

As described above, the dew-prevention valve of the present invention does not condense on the outer surface exposed to the atmosphere even if the heat-insulating coating is not applied other than the usual heat-insulating material covering the valve body. There is no need to heat-insulate the valve shaft and leg cylinders, the insulation is easy and easy, no skilled workers are required for the insulation, the amount of insulation used is small, and the cost is low. , Easy to maintain. It goes without saying that conventional problems such as corrosion of metal due to dew condensation, contamination of the floor surface, and a decrease in the effect of the heat insulating material are solved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the dew condensation preventing valve according to the present invention will be described with reference to the drawings. 1, Ri front view der showing a dew condensation prevention valve of the present invention, 1 condensation prevention valve,
Reference numeral 2 denotes a valve body of the butterfly valve , 2a denotes a valve shaft cylinder slightly protruding from the valve body 2, and 2b denotes an operation provided at an upper end of the valve shaft cylinder 2a.
3 is a mounting flange for mounting the operating device, 3 is an operating device, 3
a is a leg tube formed of a synthetic resin, and a lower end portion of the leg tube 3a.
And a flange 3d at the upper end.
Has formed. The leg cylinder 3a is fixed to the mounting flange 2b.
To do this, connect the flange 3c of the leg cylinder 3a with bolts 18.
And the case 3 of the operating device 3 is attached to the flange 3d at the upper end.
The lower end of b is connected with a bolt 19. Figure 2
The leg tube 3a is formed by using a metal plate 4 composed of a cylindrical portion 4a and a plate portion 4b as a core metal. In FIG. 3, the leg tube 3a is formed integrally with the metal tube 5 as an inner diameter portion.

FIG. 4 is a partial sectional front view showing an example of a coupling 8 for connecting the valve shaft 6 and the output shaft 7 of the operating device 3, and the coupling 8 is made of glass fiber or the like. It is made of reinforced synthetic resin, and is fixed to the valve shaft 6 and the output shaft 7 by keys 9 and 10,
And the output shaft 7 are connected. FIG. 5 is a partial cross-sectional partial front view showing another example of connecting the valve shaft 6 and the output shaft 7,
The resin 8a is poured into the inner peripheral surface of the coupling 8 to eliminate heat conduction and prevent dew condensation. The pipes 12 and 13 and the pipe flanges 14 and 1 shown in FIG.
5, bolt 16 for a flange, nut 17, etc. are the same as the conventional example in FIG.

[0015] Next, will be described for the work of the above-described embodiment. Book
Examples condensation prevention valves of slightly valve shaft cylinder 2a from the valve body 2
At the connecting portion between the valve stem cylinder 2a and the leg cylinder 3a.
The position is covered with a heat insulating material 11 shown by a two-dot chain line in FIG.
You. Further , as shown in FIG. 1, the connection type between the valve stem tube 2a and the leg tube 3a is the mounting flange 2b of the valve stem tube 2a and the leg tube 3a.
The flange portion 3c of FIG.
Also, since the leg cylinder 3a is made of synthetic resin, the heat conductivity is poor, and the heat is not easily taken away by the valve stem cylinder 2a. Therefore, the temperature of the leg cylinder 3a as well as the case 3b of the operating device 3 is lowered. There is no dew condensation on the outer surfaces of the case 3b and the leg cylinder 3a exposed to the atmosphere. The synthetic resin used for the leg cylinder 3a preferably has not only poor thermal conductivity but also excellent strength, weather resistance and heat resistance.

Further, as shown in FIG. 4, since the valve shaft 6 and the output shaft 7 of the operating device 3 are connected by a coupling 8 having a heat insulating structure, the operating device 3 is heated through the output shaft 7 and the valve shaft 6. It is not deprived and does not become cold.
The type of the coupling 8 may be a cylindrical shape as shown in FIG. 4 or another type such as a flange type, regardless of the type of the heat insulating structure. The structure used may be used.

Next, as shown in FIG. 2, when the leg cylinder 3a is formed integrally with the case 3b, a structure for connecting to the case 3b is unnecessary, so that not only the material cost and the assembly cost can be reduced, but also the molding cost can be reduced. It also reduces costs. When the leg cylinder 3a is formed separately from the case 3b as in the embodiment shown in FIG. 1, the conventional operating device can be used as it is or with a slight modification. In this case, the case 3b may be made of metal or synthetic resin.

When the base tube 3 is formed by forming the metal plate 4 into a metal core as shown in FIG. 2 or by integrally forming the base tube 3 with the metal tube 5 of the inner diameter portion as shown in FIG. The leg cylinder 3a is not damaged by the applied operation reaction force or carelessly applied external force.

As described above, the anti-condensation valve 1 of the present invention can be provided with the leg cylinder 2a and the case exposed to the atmosphere without any heat insulating coating other than the normal heat insulating material 11 that covers the valve body 2. Since there is no dew condensation on the outer surface of 2b, there is no need to coat them, the heat insulation work is easy and simple, there is no need for skilled workers for the heat insulation work, and the amount of insulation used is small. It is low cost and easy to maintain. It goes without saying that conventional problems such as corrosion of metal due to dew condensation, contamination of the floor surface, and a decrease in the effect of the heat insulating material are solved.

[0020]

The effects of the anti-condensation valve of the present invention are as described above, and will be described below in a collective manner. When the valve body is coated at a low temperature, only the ordinary heat insulating material is used, and no dew condensation occurs on the portion of the valve that is exposed to the atmosphere including the operating device. For this reason, the metal does not corrode, the floor surface is not polluted by the water droplets generated by the condensation, and the effect of the heat insulating material is not reduced. In other words,
Ensure insulation of the valve stem and insulation of the valve shaft, and
Prevents dew condensation and reliably shuts off heat transfer to the operating device.
The effect of heat such as malfunction due to rust generated by condensation in the interior
Can be eliminated. In addition, since only normal heat-retaining work for the valve body is required, skilled workers are not required for the heat-retaining work, resources are saved, and the cost of the heat-retaining work and the maintenance cost are low. In addition, when the leg cylinder is formed integrally with the case, material costs and assembly costs can be reduced. When the leg cylinder is formed separately from the case, the conventional device can be used as it is or with slight modifications. it can, moreover, Ki de be attached by selecting various operation apparatus different in length, etc. of Ashito the valve body suitably, moreover, the valve body
Various operation devices with different lengths of leg barrels are selected as needed
Operation device without a base tube.
The valve body can be mounted on the valve shaft cylinder, so the valve body is common
Management by limiting the number of product types
・ In addition to streamlining production or reducing inventory,
Unnecessary valve bodies can be reused as products.
Ri, also contribute to the conservation of resources. Furthermore, the leg cylinder made of synthetic resin is prevented from being damaged by an operation reaction force or careless external force, and since it is made of synthetic resin, the mass production effect is large. Furthermore, the temperature of the operating device is prevented from being lowered through the valve shaft of the valve and the output shaft of the operating device.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a dew condensation prevention valve of the present invention.

FIG. 2 is a partial longitudinal sectional view showing a different embodiment of a leg tube of the condensation prevention valve of the present invention.

FIG. 3 is a partial longitudinal sectional view showing a different embodiment of a leg tube of the condensation prevention valve of the present invention.

FIG. 4 is a partial cross-sectional partial front view showing one embodiment of the coupling of the dew condensation preventing valve of the present invention.

FIG. 5 is a partial cross-sectional front view showing another example of the coupling of the dew condensation preventing valve of the present invention.

FIG. 6 is a front view of a butterfly valve showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Condensation prevention valve 2 Valve main body 2a Valve stem tube 3 Operating device 3a Leg tube 4 Metal plate 5 Metal tube 6 Valve shaft 7 Output shaft 8 Coupling

Claims (4)

(57) [Claims] A valve shaft protruding from a valve body;
The valve stem is slightly projected from the valve body.
A mounting flange for mounting the operating device
On the other hand, a flange is formed at the upper and lower ends of the synthetic resin leg tube.
And the flange formed at the lower end of
Bolt to the attached flange, and
Place the operating device via the bolt on the formed flange
An anti-condensation valve characterized in that: 2. A heat insulating structure the output shaft of the valve shaft and the operating device
The dew-prevention valve according to claim 1, wherein the dew-prevention valve is connected by a coupling composed of: Wherein said leg barrel, condensation prevention valve according to claim 1 or 2 formed by a metal plate mandrel. Wherein said leg barrel, condensation prevention valve according to 請 Motomeko 1 or 2 was formed on the metal tube integral with the inner diameter portion.