JP2023142753A - valve - Google Patents

Abstract

To provide a valve capable of improving maintainability, and efficiently performing cold insulation/heat insulation of a transferred fluid or heating the same.SOLUTION: A valve 10 has: a jacket portion 30 covering an outer side of a valve main body 11; a cylindrical portion 20 connected to the valve main body 11 at one end side and opened at the other end side; a valve rod 60 rotating a valve element 12; a bonnet 65 rotatably holding the valve rod 60, and detachable to the valve main body 11; and a cover body 40 formed integrally with the bonnet 65, and attachable to and detachable from the other end side of the cylindrical portion 20. The jacket portion 30 has a cylindrical portion-side covering portion 32 for partially or fully covering an outer side of the cylindrical portion 20, the cover body 40 has a projecting portion 42 which projects toward an inner side of the cylindrical portion 20 and can be fitted to the cylindrical portion 20, the projecting portion 42 has an inner pipe 45 through which the valve rod 60 can pass and has a hollow partition chamber 43 disposed around the inner pipe 45, and the inside of the partition chamber 43 can be decompressed. A heat medium can be introduced to the inside of the partition chamber 43.SELECTED DRAWING: Figure 5

Description

The present invention relates to valves. More specifically, the present invention relates to a valve having a jacket structure suitable for transferring low-temperature or high-temperature fluids.

Conventionally, various valves have been used to transfer various fluids. The valves need to be inspected, cleaned, or maintained when malfunctions occur. During the maintenance, it is necessary to remove the valve from the connected pipe. Therefore, there was a problem of poor maintainability.

Therefore, a swing type check valve (hereinafter referred to as a valve) is known that includes an opening for maintenance and improves maintainability (for example, Patent Document 1). The valve described in Patent Document 1 has an opening for maintenance provided in the upper part of the valve body, and has a maintenance cover that can be opened and closed above the opening. Therefore, the valve described in Patent Document 1 allows maintenance to be performed without removing it from the piping.

By the way, when transferring cryogenic fluids such as liquid hydrogen (boiling point: -253°C) or liquid helium (boiling point: -269°C), it is necessary to use valves and piping (hereinafter referred to as valves, etc.) to prevent the fluid from vaporizing. It is necessary to provide a vacuum jacket for heat insulation on the outside of the fluid (referred to as .) to reduce the heat input from the outside air to the fluid. However, even if a vacuum jacket is provided on the outside of the valve, etc., if the part of the outer surface of the valve, etc. whose temperature is below the boiling point of liquid oxygen (-183°C) is exposed to the outside air, There is a concern that the oxygen in the area will liquefy and liquid oxygen will be produced. Therefore, it is necessary to attach a vacuum jacket to areas where the temperature may be below the boiling point of liquid oxygen and isolate them from the outside air.

Publication No. 57-80769

However, when the valve described in Patent Document 1 is covered with a jacket, the opening for maintenance and the maintenance cover are also covered, so there is a problem that maintenance cannot be performed. To solve this problem, as shown in FIG. 8, it is necessary to extend the maintenance opening 83 of the valve 80, the maintenance cover 84, etc. together with the jacket 85 to a position where liquid oxygen is not generated. Therefore, the maintenance opening 83 needs to be provided at a position that is largely spaced upward from the opening 82 of the valve body 81.

Therefore, when the valve body 81 is extended upward as shown in FIG. 8, fluid enters the extended portion, and heat input from the upper side causes the vaporized low-temperature gas to be convected as shown by the broken arrow in the figure. There is a problem that makes it easier. As described above, the convection of the vaporized low-temperature fluid cools the maintenance cover 84 and the like, and there is a concern that liquid oxygen may be generated outside the maintenance cover 84 and the like. Therefore, it is necessary to provide the maintenance opening 83, the maintenance cover 84, etc. at a very high position (a position far away from the valve body 86 and the piping 87) where it is not affected by convection. As a result, there was a problem that maintainability deteriorated. As described above, in conventional valves, it has been difficult to solve the contradictory problems of efficiently keeping the transferred fluid cool while maintaining maintainability.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a valve that can not only efficiently keep the fluid to be cooled, but also keep it warm or heated, while improving the maintainability of the valve.

(1) The valve of the present invention provided to solve the above-mentioned problems includes: a jacket portion that covers the outside of the valve body; a cylindrical portion whose one end side is connected to the valve body and the other end side is open; A valve body disposed inside a main body, a valve stem connected to the valve body to rotate or reciprocate the valve body, and a valve body that holds the valve stem so as to be rotatable or reciprocating. a bonnet that is removably provided to the bonnet; and a lid that is integrally formed with the bonnet and that is removably provided on the other end of the cylindrical portion and seals the other end. The jacket part has a cylindrical part side covering part that covers part or all of the outside of the cylindrical part, and the lid protrudes toward the inside of the cylindrical part from the back side and covers the cylindrical part. has a protrusion that can be fitted into the interior of the valve, the protrusion has an inner pipe through which the valve stem can pass, and a hollow compartment disposed around the inner pipe, the compartment being , the interior can be depressurized.

The above-mentioned valve has a cylindrical portion connected at one end to the valve body, and the other end of the cylindrical portion is open. Further, the other end of the cylindrical portion is sealed with a removable lid. Therefore, in the above-mentioned valve, by removing the lid, it is possible to access the inside of the valve body through the cylindrical portion. Therefore, the above-mentioned valve can improve maintenance (for example, cleaning, repair, inspection, etc.) inside the valve body.

Further, the above-mentioned valve has a protruding part on the back side of the lid body, and the protruding part can be fitted into the inside of the cylindrical part and has a hollow compartment inside. . Further, the interior of the compartment can be depressurized. Here, the above-mentioned pressure reduction is preferably performed until the inside of the compartment becomes an adiabatic state (vacuum state), for example. As a result, the above-mentioned valve can block heat input from the other end side (for example, the upper side) of the cylindrical part, so the height of the cylindrical part (lid body) can be set low, and the valve stem and And the length of the bonnet can be shortened. As a result, it becomes easier to access the inside of the valve (for example, the seal portion), and it is expected that maintainability will be improved and the valve will be made smaller.

Moreover, the above-mentioned valve can be reliably insulated from the outside air by the lid (compartment) and the jacket part. Therefore, the above-mentioned valve can suppress the production of liquid oxygen even when transferring cryogenic fluids such as liquid hydrogen, liquid helium, and liquid nitrogen. Moreover, even when transferring high-temperature fluid, the above-described valve can prevent the high-temperature portion from being directly exposed to the outside. Note that the pressure inside the compartment may be reduced by, for example, providing a suction port in the compartment and evacuating the air in the compartment from the suction port using a vacuum pump or the like. In addition, in the above-mentioned valve, the valve body and the bonnet jacket part are independent, so it is possible to remove the bonnet for maintenance while maintaining the pressure (e.g. vacuum level) in the valve body jacket part. It is.

(2) The valve of the present invention provided to solve the above-mentioned problems includes a jacket portion that covers the outside of the valve body, a cylindrical portion whose one end side is connected to the valve body and the other end side is open, and the valve body. A valve body disposed inside a main body, a valve stem connected to the valve body to rotate or reciprocate the valve body, and a valve body that holds the valve stem so as to be rotatable or reciprocating. a bonnet that is removably provided to the bonnet; and a lid that is integrally formed with the bonnet and that is removably provided on the other end of the cylindrical portion and seals the other end. The jacket part has a cylindrical part side covering part that covers part or all of the outside of the cylindrical part, and the lid protrudes toward the inside of the cylindrical part from the back side and covers the cylindrical part. a protrusion that can be fitted into the interior of the valve, the protrusion having an inner pipe through which the valve stem can pass, and a hollow compartment disposed around the inner pipe; It is characterized in that a heat medium can be introduced into the tank.

The above-mentioned valve has a cylindrical portion connected at one end to the valve body, and the other end of the cylindrical portion is open. Further, the other end of the cylindrical portion is sealed with a removable lid. Therefore, in the above-mentioned valve, by removing the lid, it is possible to access the inside of the valve body through the cylindrical portion. Therefore, the above-mentioned valve can improve maintenance (for example, cleaning, repair [including replacement of internal parts], inspection, etc.) inside the valve body.

Further, the above-mentioned valve has a protruding part on the back side of the lid body, and the protruding part can be fitted into the inside of the cylindrical part and has a hollow compartment inside. . Further, the compartment is capable of introducing a heat medium. For example, steam or heat medium oil can be used as the above-mentioned heat medium. Therefore, according to the above-mentioned valve, the valve can be efficiently kept warm or heated while ensuring maintainability. Here, the introduction of the heat medium can be achieved, for example, by providing an inlet in the compartment and sealing the heat medium into the compartment from the inlet, or by providing an outlet separate from the inlet and introducing the heat carrier into the compartment. Various means can be adopted, such as circulation.

(3) In the above-described valve of the present invention, it is preferable that the compartment is formed so that at least a portion thereof overlaps with the cylindrical portion side covering portion.

By having such a configuration, the above-described valve can reliably keep the fluid (including vaporized gas) cool, warm, or heated. That is, the valve of the present invention can suppress, for example, the temperature of the fluid (for example, liquid hydrogen, liquid helium, liquid nitrogen) from being transmitted to the outside air via the valve. Thereby, the above-mentioned valve can suppress the production of liquid oxygen. Moreover, even when transferring high-temperature fluid, the above-described valve can prevent the high-temperature portion from being directly exposed to the outside.

(4) In the jacket structure of the present invention described above, a part or the entire inner wall of the compartment is made of at least one of a low-radiation heat insulation sheet, or a multilayer insulation material consisting of a low-radiation heat insulation sheet and a spacer material. It is preferable that it be covered with one layer.

By having such a structure, the above-mentioned jacket structure can suppress heat transfer due to radiation, so that the heat insulation properties can be further improved.

(5) In the above-described valve of the present invention, it is preferable that a seal portion is formed between the inner wall of the cylindrical portion at the one end side and the outer wall of the protruding portion.

By having such a configuration, the above-described valve can seal (seal) the gap created between the inner wall on one end side of the cylindrical portion and the outer wall of the protruding portion. Therefore, fluid (for example, liquid hydrogen, liquid helium, liquid nitrogen) that has entered the space between the lower part of the protrusion (compartment) and the valve body is retained in the space as a gas. Here, since gas has lower thermal conductivity and heat transfer coefficient than liquid, the heat insulation effect in the space is enhanced. Therefore, in the above-mentioned valve, the height of the cylinder part can be set lower due to the synergistic effect with the jacket part. Thereby, the above-mentioned valve can improve maintainability. Moreover, since the above-mentioned valve can suppress the infiltration of low-temperature liquid into the cylindrical portion, cooling of the lid portion 41 can be suppressed. Therefore, the above-mentioned valve can suppress the production of liquid oxygen. Moreover, even when transferring high-temperature fluid, the above-described valve can prevent the high-temperature portion from being directly exposed to the outside.

(6) In the above-described valve of the present invention, the sealing performance of the sealing portion increases when the pressure on the valve body side becomes higher than the pressure on the cylindrical portion side, and the pressure on the cylindrical portion side increases when the pressure on the valve body side increases. When the pressure increases above , the sealing performance may be reduced.

By having such a configuration, the above-mentioned valve can improve sealing performance when the internal pressure on the piping side increases, and can reliably seal the gap between the lid and the cylindrical portion. Therefore, the above-mentioned valve can suppress the intrusion of low-temperature liquid into the cylindrical part and the cooling of the lid part, so that the generation of liquid oxygen can be suppressed. On the other hand, in the unlikely event that fluid passes through the seal and enters the gap between the lid and the cylindrical part, the fluid vaporizes and the internal pressure in the cylindrical part increases, the sealing performance is reduced and the pressure is reduced. Since it can escape to the piping side, it is possible to prevent abnormal pressure rise that occurs due to the provision of a sealing part. Further, the jacket structure described above can prevent the high temperature portion from being directly exposed to the outside even when high temperature fluid is transferred.

(7) The above-described valve of the present invention includes a bearing holder independent of the bonnet, and a bearing that can be held in the bearing holder, and the bearing holder is disposed below the protrusion and , the valve stem may be rotatably supported via the bearing.

In the above-mentioned valve, a bearing holder is disposed independently of the bonnet, and the valve stem is rotatably supported via the bearing held in the bearing holder. Therefore, the valve stem can be centered with the bonnet removed. Therefore, according to the above-mentioned valve, ease of assembly and maintenance are improved. Furthermore, with the above-mentioned valve, all parts such as the valve body and seals inside the valve body can be taken out by removing the bonnet together with the lid body and taking out the bearing holder from the valve body, improving maintainability. can be done.

(8) The above-mentioned valve of the present invention preferably has a drive unit that rotationally drives or linearly drives the valve stem, and the valve stem is preferably divided into a plurality of parts.

In the above-mentioned valve, since the valve stem is divided into a plurality of parts, centering can be performed by, for example, the first valve stem connected to the valve body alone. That is, in the above-described valve, the first valve stem can be centered with the lid and bonnet removed. Therefore, according to the above-mentioned valve, ease of assembly and maintenance are improved. Further, the connection of other valve stems connected to the first valve stem and the attachment of each valve stem to the lid body etc. may be performed after centering the first valve stem.

Further, in the above-mentioned valve, since the valve stem can be divided, the hanging allowance for a crane or the like when removing the bonnet can be set low. Therefore, maintainability is improved. Furthermore, since the maintenance space above the valve body can be kept to a minimum, the installation space for the valve can be made compact while maintaining ease of maintenance.

According to the present invention, it is possible to provide a valve that can improve maintainability and efficiently keep the fluid to be transferred cold, warm, or heated.

FIG. 2 is a side cross-sectional view of a jacket structure according to a first embodiment that can be employed in a valve of the present invention. FIG. 2 is an enlarged view of the vicinity of the seal portion in FIG. 1. FIG. FIG. 7 is a side cross-sectional view of a jacket structure according to a second embodiment that can be employed in the valve of the present invention. 4 is a sectional view taken along the line AA in FIG. 3. FIG. FIG. 7 is a side sectional view of a valve of the present invention that employs a jacket structure according to a third embodiment. 6 is an enlarged view of the upper part of the valve body in FIG. 5. FIG. FIG. 7 is a side cross-sectional view of a valve according to a modification of the present invention. It is an explanatory view of a valve in a conventional check valve.

First, a first embodiment and a second embodiment relating to jacket structures 1A and 1B, which constitute the basic structure of the valve 10 of the present invention, will be described below. Next, valves 10C and 10D of the present invention employing jacket structures 1A and 1B will be explained in detail as a third embodiment and a modification thereof.
≪First embodiment≫
Hereinafter, a jacket structure 1A (also collectively referred to as jacket structure 1) according to the first embodiment will be described with reference to FIG. 1. In the first embodiment, a case will be described in which the jacket structure 1A is employed in a swing type check valve 10A (also referred to as a valve 10A, and also collectively referred to as a valve 10). Further, a case will be described in which the fluid transferred by the pipe 2 and the check valve 10A is liquid hydrogen, liquid helium, or liquid nitrogen as a cryogenic fluid.

As shown in FIG. 1, a check valve 10A employing a jacket structure 1A includes a valve body 11 as a housing, a pipe 2 connected to the valve body 11, and a cylindrical portion 20 disposed on the upper part of the valve body 11. A jacket part 30 that covers the valve body 11, the piping 2, etc., and a lid body 40 that seals the upper part of the cylindrical part 20, etc. are provided.

The valve body 11 is formed as a housing having an internal space. The valve body 11 has pipes 2 connected to both ends in the horizontal direction (horizontal direction in the figure) on the lower end side by welding or the like. The valve body 11 includes a valve body 12 and a swing arm 13 for swinging the valve body 12.

The valve body 11 has an opening 14 for maintenance formed on the upper end side. A valve body 12, a swing arm 13, etc. are provided below the opening 14, and the opening 14 allows access to these. Therefore, the operator can easily inspect and repair (including replacing internal parts) the check valve 10A and the piping 2 through the opening 14.

Further, a flange 15 for attaching the swing arm 13 is fixed on the opening 14. The flange 15 has an opening that communicates with the opening 14 . Further, the flange 15 is formed with an arm support portion 15A extending downward along the opening edge of the opening portion 14 on the lower surface side.

The swing arm 13 is rotatably supported at its base end by an arm support portion 15A located above the valve body 12. The swing arm 13 is capable of vertical rotation together with the valve body 12 that receives fluid pressure.

The valve body 12 is formed as a disk-shaped member large enough to close the flow path of the valve body 11, and a seal (not shown) is provided on the abutment surface of the valve body 12 and the valve body 11. Note that the seal may be provided as an independent component, may have surface treatment applied to the valve body 12 and/or the valve body 11, or may have a machined surface formed on the valve body and/or the valve body 11. , various forms can be adopted. Further, the valve body 12 has a tip end of a swing arm 13 connected to the back side (inside the valve body 11). Therefore, when the valve body 12 receives fluid pressure and the swinging arm 13 rotates, the valve body 12 moves between the closed position where it closes the valve body 11 and the open position where it opens the flow path of the valve body 11. It is said that it oscillates between.

The cylindrical portion 20 has one end side, which is a base end, connected to the upper part of the valve body 11 and the other end side open toward the outside of the valve body 11 . The cylinder portion 20 is formed in a cylindrical shape and is arranged to surround the opening 14 of the valve body 11. Therefore, the operator can access the inside of the valve body 11 via the cylindrical portion 20. A screw hole for fixing a lid 40, which will be described later, is formed at the other end (upper end) of the cylindrical portion 20. Furthermore, a protruding portion 42 of a lid body 40, which will be described later, can be fitted into the cylindrical portion 20.

The jacket portion 30 has an internal space and covers at least the outside of the piping 2. In this embodiment, the jacket portion 30 covers the valve body 11 and the cylindrical portion 20 in addition to the piping 2 from the outside. The jacket portion 30 also includes a tube-side covering portion 32 that covers the outside of the tube portion 20 .

The jacket part 30 is connected to a vacuum pump (not shown) through a suitably provided suction port (not shown), and by driving the vacuum pump, the internal pressure can be reduced. be. Here, the above-mentioned pressure reduction is preferably performed, for example, until the internal space of the jacket portion 30 becomes an adiabatic state (vacuum state). Note that the jacket portion 30 is not limited to being connected to a vacuum pump, and may be previously sealed in a reduced pressure state so as to be in an insulated state.

In this embodiment, the tube-side covering portion 32 is formed outside the tube portion 20 so as to extend from one end (base end side) of the tube portion 20 toward the other end. In this embodiment, the cylinder-side covering part 32 is formed integrally with the cylinder part 20. In this embodiment, the internal space of the cylinder-side covering part 32 communicates with the internal space of the jacket part 30 in the piping 2 and the valve body 11. Note that the cylindrical portion side covering portion 32 may not only be formed integrally with the cylindrical portion 20 but may be formed independently from the cylindrical portion 20. In addition, when connecting the pipe 2 to the intermediate part of the cylindrical part 20, an opening is provided in the cylindrical part side covering part 32, and the pipe 2 is connected to the cylindrical part 20 and the jacket part 30 on the pipe 2 side through the opening. What is necessary is just to connect the cylindrical side covering part. Although details will be described later, the internal space in the cylinder side covering part 32 may be formed at a height such that at least a portion thereof overlaps with the compartment 43 in the lid body 40.

The lid body 40 includes a plate-shaped lid portion 41, a protrusion portion 42 that can be fitted into the inside of the cylindrical portion 20, a compartment 43 formed inside the protrusion portion 42, and the like. The lid body 40 is intended to seal the other end side (open end side) of the cylindrical portion 20. That is, the lid body 40 also has a function as a closing flange (maintenance cover).

The lid portion 41 is formed into a disk shape, and is formed to have approximately the same size as the outer diameter of the cylindrical portion 20. The outer peripheral portion of the lid portion 41 is fixed to the cylindrical portion 20 by a plurality of screw members 41A. That is, the lid body 40 is removably fixed to the cylindrical portion 20 by the screw member 41A. Therefore, by removing the lid 40, an operator can access the inside of the valve body 11. The lid portion 41 and the cylindrical portion 20 are sealed by a sealing member, and by fixing the lid portion 41 to the cylindrical portion 20, the other end side (open end side) of the cylindrical portion 20 is sealed. Further, the lid portion 41 is formed with a suction port 41B that communicates with a compartment 43, which will be described later.

The protruding portion 42 is formed to protrude from the back side of the lid portion 41 toward the inside of the cylindrical portion 20 . The protruding portion 42 is formed in a circular shape and has a diameter that is equal to or slightly smaller than the inner diameter of the cylindrical portion 20 . Therefore, the protruding part 42 can be fitted into the inside of the cylindrical part 20. Furthermore, a hollow compartment 43 is formed inside the protrusion 42 . Since the protruding portion 42 is configured as described above, it is possible to suppress the contact of the cryogenic fluid and the high temperature fluid with the lid portion 41 . Thereby, insulation between the cryogenic fluid and the high temperature fluid and the lid part 41 is reliably performed. Note that the shape and size of the protrusion 42 can be formed into various shapes and sizes depending on the composition, temperature, etc. of the fluid.

Further, a seal portion 50 is formed between the outer wall on the lower end side of the protruding portion 42 and the inner wall on one end side (valve body 11 side) of the cylindrical portion 20.

The seal portion 50 seals the gap between the protrusion portion 42 and the inner wall of the cylindrical portion 20, and prevents the fluid to be transferred from leaking to the outside. The seal portion 50 is arranged to surround the outer periphery of the protrusion 42 . FIG. 2 is an enlarged view of the vicinity of the seal portion 50. As shown in FIG. 2, the seal portion 50 includes a U-shaped member 51 and a spring 52 fitted into the U-shaped member 51.

The spring 52 is compressed when installed, and applies a constant load to the sealing surface of the U-shaped member 51. When the pressure increases, the pressure acts in the direction of opening the U-shaped member 51, the sealing surface pressure increases, and the sealing performance is improved. On the other hand, when the pressure on the cylindrical portion 20 side, that is, on the open end side (other end side) of the cylindrical portion 20 increases, the pressure acts in a direction to close the U-shaped member 51, and the sealing performance is reduced. In this embodiment, the U-shaped member 51 is arranged horizontally with the open side facing the protrusion 42, but the U-shaped member 51 can be arranged in various directions and locations depending on the pressure. be able to. For example, the U-shaped members 51 may be arranged in an inverted U-shape along the up-down direction. Further, the seal portion 50 can be of various forms as long as it can seal between the protrusion portion 42 and the cylindrical portion 20.

As described above, since the jacket structure 1A has the seal portion 50, even when the pressure of the fluid passing through the pipe 2 (including the check valve 10A) increases, the gap between the lid body 40 and the cylinder portion 20 can be reduced. can be reliably sealed. Therefore, the jacket structure 1A can suppress the infiltration of low-temperature liquid into the cylinder part 20 and the cooling of the lid part 41, thereby suppressing the generation of liquid oxygen. Further, the jacket structure 1A can prevent the high temperature portion from being directly exposed to the outside even when transferring high temperature fluid.

Next, the compartment 43 formed in the protrusion 42 will be explained with reference to FIG. The compartment 43 is formed in a circular shape along the radially inner side of the protrusion 42, leaving the thickness of the outer wall of the protrusion 42 intact. Therefore, the compartment 43 can cover substantially the entire radially inner side of the cylindrical portion 20 from above. The compartment 43 communicates with a suction port 41B formed in the lid portion 41. A vacuum pump (not shown) is connected to the suction port 41B via a port 44 that is detachable or connected by welding or the like.

The pressure inside the compartment 43 is reduced by exhausting the air inside the compartment 43 from the suction port 41B using the vacuum pump. Here, the degree of reduced pressure (degree of vacuum) may be, for example, a vacuum state that can exhibit an adiabatic effect. The port 44 can seal the suction port 41B after the end of pressure reduction. Thereby, the inside of the compartment 43 is maintained in a vacuum state. Note that the compartment 43 may be formed to have a thickness that can exhibit a heat insulating effect depending on the temperature of the fluid to be transferred.

The compartment 43 is formed so that at least a portion thereof overlaps with the cylindrical part side covering part 32 of the jacket part 30. Therefore, the valve body 11 is covered with the jacket portion 30 over the entire outer side. Thereby, the inside of the valve body 11 is kept cool. Note that a part or the entire inner wall of the compartment 43 is preferably covered with at least one of a low-radiation heat insulating sheet or a multilayer heat insulating material consisting of a low-radiation heat insulating sheet and a spacer material. . Thereby, the jacket structure 1 described above can suppress heat transfer due to radiation, and therefore can further improve heat insulation properties.

Although the above example illustrates the case where a cryogenic fluid is sent, the jacket structure 1A described above can also be applied to a high temperature fluid such as molten wax. In such a case, the interior of the compartment 43 may be made insulated as described above, or a heat medium may be introduced into the compartment 43. For example, steam or heat medium oil can be used as the heat medium. In this way, the jacket structure 1A described above can keep or heat the inside of the compartment 43 to a high temperature state by introducing a heat medium into the compartment 43. Here, the introduction of the heat medium can be carried out, for example, by providing an inlet in the compartment 43 and sealing the heat medium into the compartment from the inlet, or by providing a discharge port separate from the inlet and introducing the heat medium into the compartment. Various means can be employed, such as circulating the

The above is the configuration according to the first embodiment of the jacket structure 1A that can be adopted in the valve 10 of the present invention. By adopting the configuration of the jacket structure 1A described above, the valve 10 can have, for example, the following configuration. be effective.

In the valve 10, one end side of the cylindrical part 20 is connected to the valve body 11, and the other end side of the cylindrical part 20 is open. Further, the other end side of the cylindrical portion 20 is sealed with a removable lid 40. Therefore, by removing the lid 40 of the valve 10, it is possible to access the inside of the valve 10 and the piping 2 via the cylindrical portion 20. Therefore, according to the valve 10 of the present invention, maintenance (for example, cleaning, repair [including replacement of internal parts], inspection, etc.) of the inside of the valve body 11, the piping 2, etc. is improved.

Further, as described above, in the valve 10, the lid body 40 has a protruding part 42 on the back side, and the protruding part 42 can be fitted into the inside of the cylindrical part 20, and has a hollow space inside. It has a chamber 43. Further, the compartment 43 is capable of reducing the pressure inside. Therefore, since the valve 10 can block heat input from the other end side (for example, the upper side) of the cylindrical part 20, the length of the cylindrical part 20 can be shortened. As a result, it is possible to expect improved maintainability and miniaturization of the valve 10.

Further, the above-described valve 10 can reliably insulate the check valve 10A, the piping 2, etc. from the outside air by the lid body 40 (compartment 43) and the jacket portion 30. Therefore, the valve 10 can suppress the generation of liquid oxygen even when transferring cryogenic fluids such as liquid hydrogen, liquid helium, and liquid nitrogen. Furthermore, even when transferring high-temperature fluid, the valve 10 can prevent the high-temperature portion from being directly exposed to the outside.

Further, in the above-described valve 10, at least a portion of the compartment 43 is formed to overlap with the cylinder side covering portion 32, so that the fluid (including vaporized gas) can be reliably kept cool, warm, or heated. be able to. That is, the above-described valve 10 can further suppress, for example, the temperature of the fluid from being transmitted to the outside air via the pipe 2 and the valve 10.

Further, in the valve 10 described above, since the seal portion 50 is formed between the inner wall on the one end side of the cylindrical portion 20 and the outer wall of the protruding portion 42, the seal portion 50 is formed between the inner wall on the one end side of the cylindrical portion 20 and the outer wall of the protruding portion 42. It is possible to seal the gap between the Therefore, the cryogenic fluid that has entered the space between the lower part of the protrusion 42 (compartment 43) and the valve body 11 is retained in the space as a gas.

Here, since gas has lower thermal conductivity and heat transfer coefficient than liquid, the heat insulation effect in the space is enhanced. Therefore, in the valve 10 described above, the height of the cylindrical portion 20 can be set lower due to the synergistic effect with the jacket portion 30. Thereby, the above-described valve 10 can improve maintainability. Moreover, since the above-described valve 10 can suppress infiltration of low-temperature liquid into the cylindrical portion 20, cooling of the lid portion 41 can be suppressed. Therefore, the valve 10 described above can effectively suppress the production of liquid oxygen. Further, the above-described valve 10 can effectively prevent the high-temperature portion from being directly exposed to the outside even when transferring high-temperature fluid.

Next, a jacket structure 1B according to a second embodiment that can be employed in the valve 10 of the present invention will be described in detail with reference to FIGS. 3 and 4.

≪Second embodiment≫
In the second embodiment, a jacket structure 1B (also collectively referred to as jacket structure 1) is employed in a butterfly valve 10B (also referred to as valve 10B and collectively referred to as valve 10) having a long valve stem 60. I will explain about it. Note that descriptions of members similar to those in the first embodiment will be omitted. Furthermore, it should be noted that the same reference numerals are used for the same members as in the first embodiment. Furthermore, in the second embodiment, the description will be made on the assumption that liquid hydrogen, liquid helium, or liquid nitrogen, which are cryogenic fluids, are transferred as the fluid, as in the first embodiment.

3 is a cross-sectional view of the jacket structure 1B viewed from the side, and FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3. As shown in FIGS. 3 and 4, the butterfly valve 10B includes a valve body 11 as a housing, a valve body 12, a valve stem 60 connected to the valve body 12, and a bonnet arranged around the outer periphery of the valve stem 60. It is equipped with 65 mag. Piping 2 is connected to both sides of the valve body 11 in the horizontal direction.

In the second embodiment, the opening 14 is formed not directly above the valve body 12 but on the upper surface side of the valve body 11 shifted toward the piping 2 side. Furthermore, one end side of the cylindrical portion 20 is connected above the opening 14 in the valve body 11 . Therefore, the operator can access the inside of the valve body 11 from the other end side (upper end side) of the cylindrical part 20 via the opening 14. Furthermore, in the second embodiment, since the cylindrical portion 20 is provided above adjacent to the valve body 12, the seal 12A can be easily replaced. Further, maintenance (for example, cleaning, repair, inspection, etc.) of the valve body 12 as well as the valve body 11 is also possible. Details of the cylindrical portion 20 are the same as those in the first embodiment, so a description thereof will be omitted.

A lid 40 is removably fixed to the other end (open end) of the cylindrical portion 20 . The configurations of the jacket portion 30 provided to cover the cylindrical portion 20 and the lid body 40 fixed to the other end side of the cylindrical portion 20 are the same as those in the first embodiment, and therefore description thereof will be omitted.

The upper end side of the valve body 12 is connected to the valve rod 60. The valve body 12 is rotatably supported by the valve body 11. Further, a seal 12A is attached to the valve body 12 between the outer circumference of the valve body 12 and the inner circumference of the valve body 11, and by closing the valve body 12, the valve body 11 can be closed. Note that the seal 12A can be of various forms, such as one provided on the valve body 12 side, one provided on the valve body 11 side, or one provided on both the valve body 12 and the valve body 11.

The valve rod 60 is rotatably supported by the valve body 11 via a bearing 16A. Further, the valve stem 60 is connected to a drive unit 66 such as a gear, a cylinder, or a motor at the upper end side. Therefore, when the valve stem 60 is rotationally driven by the drive unit 66, the valve body 12 rotates between the closed position where the valve body 11 is closed and the open position where the flow path of the valve body 11 is opened. It is considered a thing. In addition, in the case of a gate valve or a globe valve in which the valve body 12 moves up and down, the valve body 12 may be reciprocated up and down by the drive unit 66 via the valve stem 60.

Further, a bonnet 65 is erected so as to extend upward so as to cover the outer periphery of the valve stem 60. The bonnet 65 rotatably holds the valve stem 60 via a suitable bearing (not shown).

The jacket portion 30 is provided so as to cover the piping 2, the cylinder portion 20, and the valve body 11 similarly to the first embodiment. Further, in the second embodiment, in addition to the above, the jacket portion 30 is arranged to extend upward from the base end side of the bonnet 65 (valve body 11 side) as a starting point. Therefore, the jacket portion 30 provided around the outer periphery of the bonnet 65 can suppress the generation of liquid oxygen at the lower part of the bonnet 65. The above is the configuration of the jacket structure 1B according to the second embodiment that can be employed in the valve 10 of the present invention, but the jacket structure 1B according to the second embodiment also has the same effects as the first embodiment.

In addition, the jacket structure 1A according to the first embodiment and the jacket structure 1B according to the second embodiment employ the above-described configuration, so that various piping 2 and fluid devices (various valves, flow meters, strainers, etc.) It can be installed in various locations. This improves the heat insulation of the piping 2 and the fluid equipment, and also improves maintainability.

Next, a butterfly valve 10C according to a third embodiment of the present invention will be described in detail below with reference to FIG. 5.

≪Third embodiment≫
In the third embodiment, a jacket structure 1C (generally referred to as jacket structure 1 We will explain the case where the following is adopted. Further, the third embodiment has the following points: the compartment 43 is disposed above the valve body 12, and the valve stem 60 is divided into a first valve stem 61 and a second valve stem 62. This is the main difference between the two embodiments. Note that descriptions of members similar to those in the first embodiment and the second embodiment will be omitted. Furthermore, it should be noted that the same reference numerals are used for the same members as in the first embodiment and the second embodiment. Further, in the third embodiment as well, the description will be made assuming that liquid hydrogen, liquid helium, or liquid nitrogen, which are cryogenic fluids, are transferred as the fluid, as in the first embodiment and the second embodiment.

As shown in FIG. 5, the butterfly valve 10C includes a valve body 11 as a housing, a valve body 12, a cylindrical portion 20, a valve stem 60 connected to the valve body 12, and an outer circumference of the valve stem 60. It is equipped with a bonnet 65 and the like. Piping 2 is connected to both sides of the valve body 11 in the horizontal direction.

In the third embodiment, an opening 14 is formed on the valve body 11. Further, one end side (base end side) of the cylindrical portion 20 is connected above the opening portion 14 in the valve body 11 . Further, a lid body 40 is provided at the other end (upper end) that is the open end of the cylindrical portion 20, and closes the other end of the cylindrical portion 20.

Further, in the third embodiment, a bearing holder 16 is provided below the protrusion 42 of the lid 40. FIG. 6 is an enlarged view of the upper portion of the valve body 11. The bearing holder 16 has an opening, into which the bearing 16A is fitted. Further, the bearing holder 16 is formed in a plate shape and is removably fixed to the opening edge of the opening 14 with a bolt or the like. The upper surface side (protrusion 42 side) and lower surface side (valve body 12 side) of the bearing holder 16 are in communication, and fluid (gas) vaporized from inside the valve body 11 can flow into the protrusion 42 side. It is.

As shown in FIG. 5, the butterfly valve 10C has a cylindrical bonnet 65 that rotatably holds the valve stem 60. In the third embodiment, the bonnet 65 is formed integrally with the lid body 40. Therefore, the bonnet 65 can be attached to and detached from the valve body 11 integrally with the lid body 40. The bonnet 65 is formed to extend upward and rotatably holds the valve stem 60 via a bearing 65A.

Further, an inner pipe 45 is formed in the protrusion 42 so as to surround the valve rod 60. The inner tube 45 is formed integrally with the bonnet 65 by extending the bonnet 65 downward. Thereby, the inner tube 45 is communicated with the inside of the bonnet 65. Further, the inner tube 45 serves as a partition wall that partitions the compartment 43. Therefore, in the third embodiment, the compartment 43 has a donut shape. Note that the inner tube 45 is not limited to one formed integrally with the bonnet 65, and may be one in which a divided bonnet 65 is connected to the upper end side of the inner tube 45.

The valve rod 60 is erected so as to pass through the lid body 40. The valve rod 60 is divided into a first valve rod 61 located on the lower side (valve body 12 side) and a second valve rod 62 located on the upper side of the first valve rod 61. The first valve rod 61 and the second valve rod 62 are removably connected to each other by appropriate means such as a key or a pin, and can integrally rotate. Therefore, when the drive unit 66 is driven, the valve rod 60 rotates and the valve body 12 is opened and closed.

The first valve rod 61 has a lower end connected to an upper end of the valve body 12 . The first valve rod 61 is formed shorter than the second valve rod 62. Further, the first valve rod 61 is rotatably supported by the bearing 16A of the bearing holder 16 at the upper end side. Moreover, the upper end side of the first valve rod 61 protrudes upward via the bearing 16A. As described above, the upper end side of the first valve rod 61 is removably connected to the lower end side of the second valve rod 62. Further, the upper end side of the first valve rod 61 is accommodated in the inner pipe 45 of the compartment 43 .

The second valve rod 62 has a hollow portion 62A formed from the lower end toward the upper end so that the heat transfer area becomes smaller. The hollow portion 62A communicates with the inside of the valve body 11 and allows fluid (gas) vaporized inside the valve body 11 to flow therein. Therefore, the hollow portion 62A can suppress the inflow of low-temperature liquid having a high heat transfer coefficient due to the inflow of gas. Thereby, the hollow portion 62A can suppress freezing in the gland packing portion 67 of the second valve rod 62. Further, the second valve rod 62 has its lower end accommodated in the inner tube 45 and its upper end relative to the lid body 40 rotatably held inside the bonnet 65 . Note that the second valve rod 62 is removable from the bonnet 65.

As described above, in the butterfly valve 10C (valve 10) according to the third embodiment, the valve stem 60 is divided into the first valve stem 61 and the second valve stem 62, so that, for example, the bearing of the bearing holder 16 16A, centering can be performed by the first valve rod 61 alone. That is, in the butterfly valve 10C, the first valve rod 61 can be centered with the lid body 40 and the bonnet 65 removed. Therefore, according to the butterfly valve 10C, ease of assembly and maintenance are improved. Note that, as in the third embodiment, by forming the first valve rod 61 to be shorter than the second valve rod 62, centering of the first valve rod 61 becomes easier. The connection of the first valve rod 61 and the second valve rod 62 and the attachment of the lid body 40 (bonnet 65) may be performed after centering the first valve rod 61. Moreover, the butterfly valve 10C according to the third embodiment described above can be operated by removing the bonnet 65 together with the lid 40 and removing the bearing holder 16 from the valve body 11. Since all parts can be taken out, maintainability can be improved.

In addition, in the butterfly valve 10C according to the third embodiment, the jacket portion 30 of the valve body 11 and the compartment 43 of the bonnet 65 are independent, so the pressure of the jacket portion 30 of the valve body 11 (for example, the degree of vacuum ) can be removed for maintenance while maintaining the bonnet 65. Therefore, by employing the butterfly valve 10C of the present invention, maintainability is improved.

Further, in the butterfly valve 10C according to the third embodiment, since the valve stem 60 can be divided, the hanging allowance for a crane or the like when removing the bonnet 65 can be set low. Therefore, maintainability is improved. Furthermore, since the maintenance space above the valve body 11 can be kept to a minimum, the installation space for the valve 10 can be made compact while maintaining maintainability. The other effects are the same as those of the first embodiment and the second embodiment, so the explanation will be omitted.

The above is the configuration of the butterfly valve 10C of the present invention according to the third embodiment. Next, the butterfly valve 10D according to a modification of the third embodiment will be described in detail with reference to FIG. 7.

≪Modification example≫
In a modified example, a jacket structure 1D (also collectively referred to as jacket structure 1) is adopted for a butterfly valve 10D (also collectively referred to as valve 10) having a bonnet 65, similar to the butterfly valve 10C according to the third embodiment. Let me explain the case. The configuration of the butterfly valve 10D according to the modified example is the same as that of the third embodiment except that the second compartment 43B is arranged so as to extend along the outer periphery of the bonnet 65, so a description of the similar parts will be omitted. do. Furthermore, it should be noted that the same reference numerals are used for the same members as in the first embodiment and the second embodiment. Also, in the modification of the third embodiment, the description will be made assuming that liquid hydrogen, liquid helium, or liquid nitrogen, which are cryogenic fluids, are transferred as the fluid, similarly to the first and second embodiments.

As shown in FIG. 7, the second compartment 43B is formed to extend upward from the top surface of the lid 40, and is also formed to extend along the outer periphery of the bonnet 65. That is, the second compartment 43B is arranged so as to cover at least a portion of the outer periphery of the bonnet 65. Further, the second compartment 43B communicates with a compartment 43 (also referred to as a first compartment 43A) formed on the lower surface side of the lid body 40. Further, a port 44 can be connected to the upper part of the second compartment 43B removably or by welding or the like. Therefore, the first compartment 43A and the second compartment 43B are brought into a reduced pressure state (e.g., vacuum state) by suctioning through the port 44 with an appropriate vacuum pump (not shown). be able to. In this way, the butterfly valve 10D according to the modification can improve the heat insulation including the outer circumference of the bonnet 65. Therefore, in the butterfly valve 10D, heat input from the outside air to the fluid can be further reduced, and vaporization of the fluid can be suppressed.

The above are various embodiments and modifications of the valve 10 according to the present invention and the jacket structure 1 that can be adopted for the valve 10, but the valve 10 of the present invention is limited to those according to the embodiments described above. Instead, various modifications can be made.

In this embodiment, the case where the valve 10 is a butterfly valve is illustrated, but the valve 10 of the present invention can be applied to various types of valves, such as a rotary ball valve, a gate valve in which a valve body moves up and down, and a globe valve. valves are available. In addition, when employing a gate valve or a globe valve as the valve 10, the valve stem 60 may be reciprocated up and down by the drive unit 66. Further, in this embodiment, the cylindrical portion 20 is formed integrally with the valve body 11, but the cylindrical portion 20 is not limited to one formed integrally with the valve body 11 or the piping 2. It may be formed independently of the valve body 11. In such a case, the cylindrical portion 20 may be joined to the valve body 11, the piping 2, etc. by welding or the like. Further, the cylindrical portion 20 is not limited to a cylindrical shape, and the shape and size of the cylindrical portion 20 can be changed as appropriate depending on the shape of the valve body 11. For example, the cylindrical portion 20 may be formed in an elliptical shape or a rectangular shape.

In this embodiment, the jacket portion 30 is arranged to cover at least the piping 2, but the portion forming the jacket portion 30 may vary depending on the fluid equipment to which the jacket structure 1 is applied, the temperature of the fluid to be transferred, etc. , it is possible to arrange it in various parts. Furthermore, various shapes and sizes of the jacket portion 30 can be adopted depending on the fluid equipment to which it is applied, the temperature of the fluid to be transferred, and the like. Further, in the present embodiment, the jacket portion 30 includes a tube-side covering portion 32 that extends from one end side (base end side) of the tube portion 20 toward the other end so as to cover the outside of the tube portion 20. However, the cylinder-side covering part 32 can be formed into various shapes and lengths (sizes) according to the shape and size of the cylinder part 20. In addition, when forming the cylindrical part side covering part 32, it is desirable to communicate with the jacket part 30, but the cylindrical part side covering part 32 may be formed independently. In such a case, in order to prevent the proximal end side of the cylindrical portion 20 from being exposed to the outside air, it is desirable to form the cylindrical portion side covering portion 32 starting from one end side (the proximal end side) of the cylindrical portion 20. . In addition, when connecting the piping 2 to the intermediate part of the cylindrical part 20, an opening for connecting the piping 2 is provided in the cylindrical part side covering part 32, and the piping 2 and the jacket on the piping 2 side are connected through the opening. It is only necessary to connect the section 30. Further, the cylindrical part side covering part 32 may cover a part or all of the cylindrical part 20, and may have various forms depending on the structure of the fluid equipment, piping 2, etc. connected to the cylindrical part 20. is available.

Further, the shape and size of the lid body 40 (including the protruding portion 42 and the compartment 43) may be of various shapes and sizes as long as they fit into the cylindrical portion 20. Further, the compartment 43 can be of various types, such as one whose interior is previously brought into a vacuum state, or one whose pressure is reduced at appropriate times using a vacuum pump as in this embodiment.

In this embodiment, the case where liquid hydrogen, liquid helium, or liquid nitrogen, which are cryogenic fluids, is transferred as the fluid is exemplified, but the valve 10 of the present invention can be used for various types of fluids. The valve 10 of the present invention can also be used, for example, to transfer high-temperature wax, oil, and the like. In such a case, it is desirable to introduce a heat medium into the compartment 43. In this way, the jacket structure 1 of the present invention can effectively keep and heat the fluid even when transferring high-temperature fluid, and can also suppress direct exposure of high-temperature parts. Further, when introducing a heat medium into the compartment 43, an inlet for introducing the heat medium and an outlet for discharging the heat medium may be provided. Thereby, the valve 10 can continuously introduce the heat medium from the inlet of the compartment 43 toward the outlet, so that the fluid can be effectively kept warm and heated.

In this embodiment, at least a part of the compartment 43 is formed so as to overlap with the cylinder-side covering part 32 of the jacket part 30, but the compartment 43 does not overlap only with the cylinder-side covering part 32. Instead, various forms can be adopted. For example, the compartment 43 may be formed so as not to overlap the cylinder-side covering portion 32.

In this embodiment, the seal portion 50 is formed between the inner wall at one end side (base end side) of the cylindrical portion 20 and the outer wall of the protruding portion 42, but the seal portion 50 may be provided as necessary. It is also possible to adopt a configuration in which the seal portion 50 is not provided. Furthermore, the seal portion 50 is not limited to one whose sealing properties change according to changes in internal pressure and external pressure as in the present embodiment, and various types of seal members can be employed. For example, the seal portion 50 may have a certain sealing property.

In this embodiment, the valve stem 60 of the valve 10 is divided into a first valve stem 61 and a second valve stem 62, but the valve stem 60 may be undivided or divided into two or more parts. Various shapes and lengths of the valve stem 60 can be used, such as a shaped one. Further, the lengths of the first valve rod 61 and the second valve rod 62 can be changed as appropriate, and the hollow portion 62A provided in the second valve rod 62 may also be provided as necessary.

In this embodiment, the valve 10 provided with the bearing holder 16 is illustrated, but the bearing holder 16 may be provided as needed, and a configuration may be adopted in which the bearing holder 16 is not provided. Moreover, in this embodiment, although the valve 10 in which the bonnet 65 is integrally formed with the lid 40 is illustrated, the bonnet 65 may be integrally formed with the lid 40 as necessary. For example, the bonnet 65 may be formed independently of the lid 40.

In this embodiment, the valve 10 is illustrated, but the jacket structure 1 that can be employed in the valve 10 of the present invention can be used in various fluid devices. For example, the jacket structure 1 can be used for measuring instruments that measure the state of fluid, such as a flow meter, and piping components, such as a strainer. Further, the jacket structure 1 that can be employed in the valve 10 of the present invention can be used for one or a combination of various fluid devices. As described above, the jacket structure 1 according to the present embodiment improves the maintainability of various fluid devices including the valve 10, the flow meter, and the strainer, and can efficiently keep these fluid devices cold, warm, or heated. . Therefore, the jacket structure 1 according to the present embodiment can be expected to have the effect of increasing the versatility of the valve 10, flowmeter, strainer, and the like.

The above are various embodiments and modifications of the jacket structure 1 according to the present invention, but the present invention is not limited to the embodiments and modifications described above, and departs from the scope of the claims. Those skilled in the art will readily understand that other embodiments are possible within the scope and spirit of the teachings and spirit thereof.

The valve of the present invention can be used as various valves such as butterfly valves, ball valves, gate valves, and globe valves that can keep internal fluid cold, warm, or heated.

1: Jacket structure 1A: Jacket structure 1B: Jacket structure 1C: Jacket structure 1D: Jacket structure 10: Valve 10A: Check valve (valve)
10B: Butterfly valve (valve)
10C: Butterfly valve (valve)
10D: Butterfly valve (valve)
11 : Valve body 12 : Valve body 14 : Opening part 16 : Bearing holder 16A : Bearing 20 : Cylinder part 30 : Jacket part 32 : Cylinder side covering part 40 : Lid body 42 : Projection part 43 : Compartment 45 : Inner pipe 50 : Seal part 60 : Valve stem 61 : First valve stem 62 : Second valve stem 62A : Hollow part 65 : Bonnet 66 : Drive part 67 : Gland packing part

Claims (8)

a jacket part that covers the outside of the valve body;
a cylindrical portion whose one end side is connected to the valve body and whose other end side is open;
a valve body disposed inside the valve body;
a valve rod that is connected to the valve body and rotates or reciprocates the valve body;
a bonnet that holds the valve stem rotatably or reciprocally and is detachably attached to the valve body;
a lid that is integrally formed with the bonnet, is removably provided on the other end of the cylindrical portion, and seals the other end;
The jacket part has a cylindrical part side covering part that covers a part or all of the outside of the cylindrical part,
The lid body has a protrusion that protrudes from the back side toward the inside of the cylindrical portion and can be fitted into the inside of the cylindrical portion,
The protrusion has an inner pipe through which the valve stem can pass, and a hollow compartment arranged around the inner pipe,
The valve is characterized in that the compartment can be depressurized inside. a jacket part that covers the outside of the valve body;
a cylindrical portion whose one end side is connected to the valve body and whose other end side is open;
a valve body disposed inside the valve body;
a valve rod that is connected to the valve body and rotates or reciprocates the valve body;
a bonnet that holds the valve stem rotatably or reciprocally and is detachably attached to the valve body;
a lid that is integrally formed with the bonnet, is removably provided on the other end of the cylindrical portion, and seals the other end;
The jacket part has a cylindrical part side covering part that covers part or all of the outside of the cylindrical part,
The lid body has a protrusion that protrudes from the back side toward the inside of the cylindrical part and can be fitted into the inside of the cylindrical part,
The protruding portion has an inner pipe through which the valve stem can pass, and a hollow compartment arranged around the inner pipe, and a heat medium can be introduced into the compartment. Features a valve. The valve according to claim 1 or 2, wherein the compartment is formed so that at least a portion thereof overlaps with the cylindrical portion side covering portion. Part or all of the inner wall of the compartment is covered with at least one of a low-radiation heat insulating sheet or a multilayer heat insulating material consisting of a low-radiation heat insulating sheet and a spacer material. A valve according to any one of claims 1 to 3. The valve according to any one of claims 1 to 4, wherein a seal portion is formed between an inner wall on the one end side of the cylindrical portion and an outer wall of the protruding portion. The sealing performance of the sealing part increases when the pressure on the valve body side becomes higher than the pressure on the cylindrical part side, and the sealing performance decreases when the pressure on the cylindrical part side becomes higher than the pressure on the valve body side. 6. The valve according to claim 5, wherein the valve is a bearing holder independent from the bonnet;
a bearing that can be held in the bearing holder;
According to any one of claims 1 to 6, the bearing holder is arranged below the protrusion and rotatably supports the valve stem via the bearing. valve.
It has a drive unit that rotates or reciprocates the valve stem,
The valve according to any one of claims 1 to 7, wherein the valve stem is divided into a plurality of parts.

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