JP3336536B2 - Control 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 control valve for controlling a high-temperature fluid or a low-temperature fluid as a fluid to be controlled, and more particularly to a heat-retaining (heat-retaining or cooling) structure including piping of the control valve.

[0002]

2. Description of the Related Art Fluid flowing in a fluid pipe is, for example, 23 fluids.
It is a high temperature fluid of about 0 to 400 ° C, or -17 to -4
When a low-temperature fluid of about 5 ° C. is used, a heat insulating material (heat insulating material or cold insulating material) made of glass wool, gypsum, brick, foamed styrene, or the like is wrapped around the pipe, so that the fluid is transmitted from the outside air temperature. It has conventionally been practiced not to cool or warm due to the influence. In addition, similarly to such a pipe, the control valve portion provided in the middle of the pipe also controls the hot fluid or the low-temperature fluid as a controlled fluid by passing the control valve from around the control valve body to around the upper lid. Heat insulation is wound up. By adopting such a heat retaining structure, the fluid flowing in the control valve is prevented from cooling or warming due to the influence of the transmission temperature from the outside air temperature.

[0003] Furthermore, the heat retaining structure at the control valve portion is as follows.
The high transmission temperature transmitted from the high-temperature fluid to the gland packing that slidably supports the valve shaft at the upper end of the upper lid of the control valve may affect the operation temperature. It also plays a role in preventing the transmitted low transmission temperature from affecting. That is, if the high temperature from the high-temperature fluid reaches the gland packing portion in the upper lid portion of the control valve, the sealing property is impaired, and if the low temperature from the low-temperature fluid reaches the operation unit, This is because the movable part and the lubricant on the part freeze and freeze the operation, and water is frozen on the valve shaft and damages the packing. In the above-mentioned control valve, when the controlled fluid is a high-temperature fluid or a low-temperature fluid, a tubular portion is provided on an upper lid provided at an upper end portion of the valve body, and the above-described gland packing portion is provided at a position away from the valve body. By disposing the actuator and the operating unit, the high temperature from the high-temperature fluid is cooled by the outside air temperature while transmitting through the cylindrical portion of the upper lid, or the low temperature from the low-temperature fluid is transmitted through the cylindrical portion of the upper lid while the external air temperature is low. The temperature is not affected by the temperature transmitted from the fluid.

FIG. 9 shows a heat insulating structure in such a control valve portion.
Is shown in To explain this, reference numeral 1 denotes a valve main body constituting a control valve, 2 denotes an upper lid portion fixed to an upper portion of the valve main body 1 with bolts, and the upper lid portion 2 includes upper and lower lid members 2a,
2b and a cylindrical tubular body 2c connecting them. The lids 2a and 2b and the cylinder 2
c is integrally connected by welding. The upper lid 2
, A rod portion 4a of a valve shaft 4 having a valve plug (valve element) 3 at a tip thereof penetrates therethrough and is supported so as to be vertically movable.

The valve shaft 4 is slidably supported in a cylindrical plug guide 5 fixed to the lower lid 2b, and a rod portion 4a is disposed on the upper lid 2a of the upper lid 2. The gland packing 6 as a shaft sealing unit is supported so as to maintain liquid tightness and air tightness. Reference numeral 7 denotes a seat ring (valve seat) which is provided in an opening formed in a partition wall 1a for partitioning a fluid passage formed in the valve body 1 and is located on the same axis as the valve plug 3 at the tip of the valve shaft 4. It has a distribution port 7a. Numerals 8 and 8 are fluid flow pipes connected to the flanges at both ends of the valve body 1 by bolts. The structure of such a control valve and the fluid control operation by the control valve are widely known, and a detailed description thereof will be omitted.

In the above-described control valve, when the fluid to be controlled is a high-temperature fluid or a low-temperature fluid, it has a required height by interposing the cylinder 2c between the upper and lower lids 2a and 2b as described above. The configuration is as follows. This does not affect the gland packing 6 that seals the rod portion 4a of the valve shaft 4 in a slidable state or the operating device portion (not shown) connected to the upper end portion of the rod portion 4a due to the temperature of the fluid. That's why. This is because, for example, in the case of a high-temperature fluid, the sealing performance is impaired when the effect of the high-temperature transmission temperature reaches the gland packing 6, and in the case of a low-temperature fluid, the effect of the low-temperature transmission temperature affects the operation unit. This is because the movement impairs the operation due to icing or the like.

In the figure, reference numeral 9 denotes a heat insulating material (cooling material) made of, for example, glass wool, gypsum, brick, foamed styrene, or the like. When the fluid to be controlled is a high-temperature fluid or a low-temperature fluid, the valve body 1 and the upper lid are used. 2 constituting lower lid 2b
And the pipes 8 and 8 are wound and fixed so as to cover them. 9a is a cover provided so as to cover the outside of the heat insulating material 9. The cover 9a is made of, for example, an iron plate or the like, and its surface is painted. Reference numeral 9b denotes a putty applied to the edge of an opening through which the cylindrical body 2c of the upper lid 2 penetrates in the cover 9a. The putty 9b prevents rainwater or the like from entering from a boundary between the opening and the upper lid 2. Things.

[0008]

The heat retaining structure (heat retaining or cooling structure) of the control valve as described above has the following disadvantages. In the above-described control valve, when the controlled fluid is, for example, a high-temperature fluid, the cylinder 2c of the upper lid portion 2 provided between the control valve body 1 and the gland packing portion 6 holding the valve shaft 3 on the upper side. The heat is dissipated so that the ground seal 6 is not affected by the high transmission temperature. When the fluid is a low-temperature fluid, the transmission temperature from the low-temperature fluid is heated by the outside air in the above-described cylindrical body 2c, and the operating unit provided at the upper portion of the upper lid 2a is affected by the low-temperature transmission temperature. I try not to. In particular, in this type of control valve, the height of the upper lid 2, that is, the length of the cylindrical body 2c, is controlled so that the temperature of the controlled fluid is not affected by the temperature transmitted from the fluid to the gland packing 6 and the operating unit. The temperature condition is set in consideration of the relationship with the material of the heat insulating material and the thickness of the coating in the above-described heat insulating structure.

However, when the above-mentioned heat retaining structure is used for the control valve, the range of the covering work for keeping the upper cover 2 warm is unclear. There is a problem in that the heat is not applied to the upper lid 2 and the heat dissipation or the heating effect as described above is obtained. That is, in the upper lid part 2, the heat radiation in the case of the high-temperature fluid and the heating in the case of the low-temperature fluid, together with the above-mentioned heat retaining structure, the influence of the high temperature on the sealing performance of the gland packing part 6, and the operation unit part. It is important to prevent the effect of low temperature on the malfunction of
An exposed portion of the upper lid 2 to the outside air is also required. If the amount of the heat insulating material 9 for keeping the heat is insufficient, the temperature of the controlled fluid flowing in the valve body 1 of the control valve is affected by the transmission temperature from the outside air, and It will be cooled and the cold fluid will be heated,
This is because the original purpose of adopting the heat retaining structure is impaired.

Therefore, the range in which the above-mentioned covering work for keeping the heat on the upper cover 2 is performed, that is, the upper limit in the height direction of the upper cover 2 in the heat insulating range by winding the heat insulating material 9 is determined by such an upper cover. In consideration of the heat radiation or heating of the transmission temperature in Step 2 and the temperature conditions of the fluid, etc., the heat insulating material 9 should be placed at an appropriate position where the coating of the heat insulating material 9 will not be insufficient, and the heat insulating material 9 is wound below the lower part. It is good to attach. However, conventionally, the heat insulator 9
Since there is no mark in the proper position of the upper lid 2 of the control valve (the recommended heat retaining range in which the thermal insulation material 9 can be wrapped up to the position of the upper lid so that the temperature can be reliably maintained). In many cases, the heat insulating material 9 is wound to an unnecessary portion only by the heat insulating function.

As described above, when the heat insulating coating is applied to an unnecessarily high height, as described above, the heat radiation at the upper lid 2 can be prevented.
Heating is interrupted by the heat insulating material 9, so that sufficient heat radiation or a heating effect cannot be obtained, and the high temperature affects the gland packing portion 6 to deteriorate the sealing property, and the low temperature affects the operation device portion. It may cause malfunction. For example, if the high temperature reaches the gland packing portion 6 and the sealing performance is reduced, fluid leakage may occur at this portion. Also,
A malfunction in the operation unit may make it impossible to perform a required control operation of the control valve. Further, in the above-described heat retaining structure of the conventional control valve, winding the heat retaining material 9 more than necessary not only increases the covering work but also increases the cost.

Furthermore, in the above-described conventional heat retaining structure, it is desired to prevent rainwater, moisture, and the like from entering from the boundary between the upper cover 2 of the control valve and the opening of the cover 9a covering the heat insulating material 9. That is, conventionally, the putty 9b is applied to the boundary portion between the upper lid portion 2 of the control valve and the opening of the cover 9a of the heat insulating material 9, but such putty 9 is used for a long time.
It is inevitable that there will be a gap between b and the upper lid 2,
The putty 9 is also cracked by external vibrations, impacts, and the like. When rainwater, moisture, etc. enter the heat insulating material 9 from these portions, not only does the valve body 1 become rusted or dusty, the heat insulating effect decreases, but also the weight increases due to the inclusion of moisture. There is also.

Further, as described above, if the heat insulating material 9 is unnecessarily used and is wound above the proper position, the weight increases, an extra load is applied to the pipe, and the pipe becomes weak against vibration. is there.

The present invention has been made in view of such circumstances, and when a heat insulating material is wound around a control valve body or an upper lid portion, a simple structure is used to extend the upper portion of the upper lid portion above an appropriate height position. Eliminates the task of preserving the heat insulation function of coating for heat insulation, eliminates the problem of deterioration of the sealing property at the gland packing part due to high temperature and malfunctions at the operation unit due to low temperature, and the heat insulation and top cover. It is an object of the present invention to obtain a control valve capable of preventing infiltration of rainwater or the like from between the parts.

[0015]

SUMMARY OF THE INVENTION In order to meet such an object, the present invention provides a control valve for controlling a flow of a fluid to be controlled.
In the upper part of the control valve
An identification means near the appropriate position indicating the upper limit of the heat insulation range
Then, the annular convex portion, which is a member separate from the upper lid portion, is
An elastic material is interposed between the upper cover and the upper cover of the control valve.
It is provided in. The present invention also provides a method for controlling the flow of a controlled fluid.
Control valve for controlling the
The proper position indicating the upper limit of the heat insulation range by winding the heat insulation material
An annular groove is provided in the vicinity of the control valve as an identification means,
It is provided in.

According to the present invention, the discriminating means by the annular convex portion or the annular concave portion is provided in the vicinity of the proper position of the upper lid of the control valve so that the amount of winding of the heat insulating material is appropriate. By wrapping the heat insulating material around the valve body, the top cover, and the pipe as a guide for the upper limit of the construction, the heat insulating material can be provided in a required heat insulating range.

[0017] The coating of the heat insulating material prevents the temperature of the fluid passing through the piping and the control valve from cooling or warming, and maintains a constant temperature condition, and the transmission temperature of the fluid by the upper lid portion. After the heat is released or heated at the exposed part without heat insulation material, it is transmitted to the gland packing part on the upper end of the upper lid and the operating unit provided at the upper end of the upper lid, and these parts are kept close to the outside air temperature. As a result, it is possible to eliminate problems such as the deterioration of the sealing performance at the gland packing portion and the malfunction of the operation device portion as in the related art.

The heat insulating material includes a cold insulating material that obtains a cooling effect when the controlled fluid controlled by the control valve is a high-temperature fluid or a low-temperature fluid. What is a thermal insulation structure?
In addition to the case where the heat insulating material is wound when the fluid is a high temperature fluid, the case where the cold insulating material is wound when the fluid is a low temperature fluid is also included. The heat radiation at the upper lid portion that protrudes from the heat retaining structure and is exposed to the outside includes not only the heat radiation function that works for a high-temperature fluid but also the heating function that works for a low-temperature fluid.

[0019]

1 and 2 show one embodiment of a control valve according to the present invention. In these figures, the same or corresponding parts as those in FIG. 9 described above have the same reference numerals. And the description is omitted.

According to the present invention, a heat insulating structure is adopted by covering the valve body 1 of the control valve, the portion of the upper lid portion 2 on the valve body 2 side, and the pipes 8 connected to the valve body 1 with the heat insulating material 9. In order to do this, the heat insulating material 9
In the vicinity of an appropriate position indicating the upper limit of the heat retaining range by winding, an annular flange 10 made of a separate member serving as an annular convex portion as identification means is integrally provided. Here, in this embodiment, the inner peripheral portion of the annular flange 10 is provided at an appropriate height position on the outer peripheral portion of the cylindrical body 2c of the upper lid portion 2 by the welded portion 11. In the figure, 12 is an annular flange 1
No. 0 is a putty for fixing the outer peripheral edge to the cover 19a on the heat insulating material 9 side.

According to such a configuration, the discriminating means by the annular flange 10 serving as an annular convex portion near an appropriate position which is the upper limit of the upper cover portion 2 in the heat insulating range by winding the heat insulating material 9 of the upper cover portion 2 is provided. Since the heat insulating material 9 is provided, the heat insulating material 9 is wound around the valve body 1 and the lower lid 2 and further on the pipes 8 and 8 as a guide when the heat insulating material 9 is wound.
Can be provided over the optimal heat retention range. Of course, it is assumed that the material and the thickness of the winding of the heat insulating material 9 are selected so that the temperature of the controlled fluid flowing in the valve body 1 is not affected by insufficient coating.

In such a configuration, the winding of the heat insulating material 9 prevents the temperature of the high-temperature fluid or the low-temperature fluid passing through the pipes 8, 8 and the control valve from cooling or warming due to the influence of the outside air temperature due to insufficient coating. In addition, the temperature transmitted from the fluid is radiated or heated at a portion of the upper lid 2 where the heat insulating material 9 is not provided, and then transmitted to the ground seal 6 at the upper end of the upper lid 2 to reduce the sealing performance. This eliminates the problem of malfunction due to transmission to the operation unit provided at the upper end of the upper lid 2.

In particular, in the above-described configuration, when the heat insulating material 9 is wound around the control valve body 1 and the upper lid 2, construction for keeping the temperature above the appropriate position of the upper lid 2 by a simple structure is performed. And the heat radiation or the heating action of the temperature from the fluid at a position higher than the above can be secured.
In addition, since the heat radiation or the heating effect can be obtained in this way,
As in the conventional case, when the fluid is a high-temperature fluid, the sealing performance of the gland seal portion 6 on the upper end side of the upper lid portion 2 is deteriorated. The problem can be solved.

Also, as described above, the putty 12 is provided on the outer peripheral edge of the annular flange 10 to seal the space between the cover 9a on the heat insulating material 9 side so as to prevent infiltration of rain water or the like as shown in FIG. Can be. Note that such putty 12 is not always necessary. If the amount of protrusion of the annular flange 10 is large and the entry of rainwater or the like from the opening of the cover 9a is small, the application of the putty may be omitted.

FIGS. 3 (a), 3 (b) and 3 (c) show the shape of the above-mentioned annular flange 10 and a modification thereof. An appropriate shape may be used as necessary. In addition, an elastic material 13 such as a rubber material may be interposed at the joint between the annular flange 10 and the upper lid 2 as shown in FIG. 4, and the annular flange 10 may be provided to be vertically movable. In this way, there is an advantage that it is possible to cope with an appropriate position that changes depending on the temperature condition of the controlled fluid, the coating amount of the heat insulating material 9, and the like.

FIG. 5 shows another embodiment of the control valve according to the present invention. In this figure, reference numeral 20 denotes an annular concave portion as an identification means for indicating a proper position which is an upper limit of a heat insulating range by winding the heat insulating material 9. Thus, it is formed so as to be recessed on the outer peripheral portion of the cylindrical body 2c. With such a configuration, similarly to the above-described embodiment, it is possible to accurately grasp the range in which the heat is to be retained by winding the heat retaining material 9, and to appropriately perform the heat retention (or cooling) and the heat radiation (or heating). Can be done.

FIGS. 6 and 7 show a modification of the above-described FIG.
This is an example in which rainwater is prevented from infiltrating when the heat insulating material 9 is provided by sequentially winding the heat insulating material from the bottom.
In particular, in FIG. 7, in addition to the tape 21, the flange portion 22 is provided on the outer peripheral portion of the cylindrical body 2c by welding or the like, so that a further effect can be exhibited in preventing rainwater and the like. The flange portion 22 may be either integral or separate.

FIG. 8 shows still another embodiment of the present invention, in which a small-diameter portion 24 is provided in the cylindrical body 2c of the upper lid 2, and a step formed by the small-diameter portion 24 is used as a means for identifying an appropriate position to be kept warm. Is the case. With such a configuration, the same operation and effect as those of the above-described embodiment can be obtained. Also,
The tape as described above may be wound around such a small-diameter portion 24 so as to reliably prevent rainwater from entering.

The present invention is not limited to the structure described in the above embodiment, and it goes without saying that the shape and structure of each part including the control valve can be appropriately modified and changed. For example, the structure and use of the control valve may be appropriately determined.

[0030]

As described above, according to the control valve of the present invention, the discriminating means is provided near the upper cover of the control valve and near the appropriate position indicating the upper limit of the heat retaining range by the optimal winding of the heat retaining material. Since the annular convex portion or the annular concave portion is provided integrally or separately, the identification means is a clear guide, and the heat insulating material is wound around the lower portion, so that the heat insulating material can be covered without excess or shortage. Therefore, construction for heat insulation is easy, and workability is excellent.In addition, there is no problem that waste heat insulation material is wasted as before, cost is reduced, and the total weight of the control valve part is reduced. Can be reduced.

Further, according to the present invention, since the heat insulating material is wound only below the appropriate position indicating the upper limit of the optimum heat insulating range by winding the upper lid, the annular convex portion is formed on the upper lid. Alternatively, heat (transmission temperature) transmitted from the fluid can be radiated in the upper portion of the annular groove. For example, since the high temperature of the transmission from the fluid does not reach the gland packing portion on the upper end side of the upper lid portion, The sealing property at the gland packing portion can be ensured.

[0032]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a control valve according to the present invention, showing a state where a heat retaining structure is applied to a valve body and a pipe of the control valve.

FIG. 2 is an enlarged sectional view showing the control valve of FIG. 1;

FIGS. 3 (a), (b), and (c) are views showing an annular flange serving as a means for identifying an appropriate position which is an upper limit of a heat insulating range by winding a heat insulating material in FIG. 1 and a modified example thereof.

FIG. 4 is a main part enlarged sectional view showing another embodiment of the control valve according to the present invention.

FIG. 5 is a cross-sectional view showing another embodiment of the control valve according to the present invention.

FIG. 6 is an enlarged sectional view of a main part showing a modification of FIG. 5;

FIG. 7 is an enlarged sectional view of a main part showing a further modified example of FIGS. 5 and 6;

FIG. 8 is a schematic diagram showing a modification of the control valve of FIG. 5;

FIG. 9 is a sectional view showing a heat retaining structure in a conventional control valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve body of a control valve, 2 ... Upper lid part, 2a, 2b ... Upper and lower lid body, 2c ... Cylindrical body, 3 ... Valve plug, 4 ... Valve shaft, 4a
... Rod part, 5 ... Plug guide, 6 ... Gland packing part, 7 ... Seat ring, 8 ... Piping, 9 ... Insulation material, 9a ...
Cover: 10: annular flange (annular convex portion serving as identification means), 11: welded part, 12: putty, 13: elastic material, 20
... An annular concave portion serving as an identification means, 21... A tape, 22... A flange portion, and 24.

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 51/00 F16L 59/16

Claims (2)

(57) [Claims] 1. A control valve for controlling a flow of a fluid to be controlled, comprising: an upper cover portion of the control valve, which is located near an appropriate position indicating an upper limit of a heat retaining range by winding a heat retaining material ;
The annular projection, which is a member separate from the lid, is
A control valve, wherein the control valve is provided on an upper lid portion of the control valve with an elastic material interposed therebetween . 2. A control valve for controlling a flow of a controlled fluid.
And the heat insulation range by wrapping the heat insulation material on the top cover of the control valve
Near the appropriate position indicating the upper limit of
A control valve, wherein a groove is provided in an upper lid of the control valve.