Complete drawing type cryogenic regulating valve for cold box

Abstract

The utility model relates to an integral drawing type cryogenic regulating valve for a cold box, which is characterized by comprising a valve body, a valve rod, an extended valve rod, an extended valve cover, a valve core, a valve seat and a valve cage, the extended valve cover is arranged between the valve cover and the valve body, the valve cover is fixedly connected with one end of the extended valve cover through a bolt, and the other end of the extended valve cover is connected with the valve body. A valve cage is arranged in the extension valve cover, the valve seat is connected to the valve cage in a threaded installation mode, a valve element is arranged in the valve seat, an extension valve rod is arranged between the valve element and the valve rod, the valve element is connected with one end of the extension valve rod, and the other end of the extension valve rod is connected with the valve rod. According to the utility model, the valve internals can be entirely pulled and disassembled, and can be quickly taken out from the top of the valve for online maintenance without opening the cold box and pushing open pearlife in the cold box, so that the maintenance operation of the regulating valve is facilitated, the labor intensity of workers is reduced, the time required for maintenance is greatly shortened, and the working efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of cold box regulating valve technology, and in particular to a whole-pull cold box cryogenic regulating valve. Background Technology

[0002] In the cryogenic air separation industry, many control valves need to operate in low-temperature environments. Currently, most valves are housed in cold boxes, with the remaining space inside the cold box filled with insulating material (perlite) to keep them cool.

[0003] However, because valves require regular maintenance, the insulation material, namely perlite, inside the cold box must be stripped before maintenance can begin. To ensure safety, the interior of the cryogenic air separation cold box must be reheated to room temperature during the stripping process to prevent the presence of cryogenic liquids that could cause safety accidents. A 20,000 m³ / h oxygen production cryogenic air separation cold box requires approximately 10 days for heating, stripping, maintenance, and refilling. This large-scale cryogenic air separation cold box not only has long maintenance times and high costs, impacting the production efficiency of cryogenic air separation equipment, but the labor intensity of stripping is far greater than that of valve maintenance. Furthermore, some imported valve manufacturers require specialized tools and personnel for valve maintenance, resulting in extremely high costs and causing significant problems for many companies.

[0004] In view of the above problem, we designed a fully withdrawable cryogenic regulating valve for cold boxes with a structure that facilitates online valve maintenance. Utility Model Content

[0005] In view of the above-mentioned technical problems, this utility model provides a fully removable cryogenic regulating valve for cold boxes, which enables the complete removal and disassembly of the valve internals. It can be quickly removed from the top of the valve for online maintenance without opening the cold box or removing the perlite inside the cold box.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A cryogenic regulating valve for a fully-accessible cold box, characterized by comprising a valve body, a valve stem, an extension valve stem, an extension valve cover, a valve core, a valve seat, and a valve cage. An extension valve cover is provided between the valve cover and the valve body. One end of the valve cover and the extension valve cover are fixedly connected by bolts, and the other end of the extension valve cover is connected to the valve body. A valve cage is housed inside the extension valve cover. The valve seat is threadedly connected to the valve cage. A valve core is housed inside the valve seat. An extension valve stem is provided between the valve core and the valve stem. One end of the valve core is connected to the extension valve stem, and the other end of the extension valve stem is connected to the valve stem.

[0008] The valve stem passes through and extends from the center of the valve cover, and spring-loaded packing is provided between the valve stem and the valve cover.

[0009] A sealing ring is provided at the connection between the valve seat and the valve body, and the sealing ring is set in the mounting groove provided on the valve seat.

[0010] Furthermore, the extended valve stem is located inside the extended valve cover, and a connecting flange is provided on the outside of the extended valve cover, through which the regulating valve is installed on the cold box.

[0011] The beneficial effects of this utility model are:

[0012] In this utility model, the control stroke of the regulating valve is extended by designing an extended valve stem and an extended valve cover. This ensures that the valve body and the part of the pipeline to be connected are located inside the cold box, while the valve stem and valve cover of the drive part are located outside the cold box. This avoids the spring-loaded packing between the valve stem and the valve cover from having reduced elasticity due to low temperature, which would affect the sealing performance of the connection.

[0013] This utility model connects the designed valve seat to the valve cage in the extended valve cover via a threaded connection. During maintenance, simply remove the valve cover and pull the valve cage outwards to extract the valve internals, consisting of the valve stem, extended valve stem, valve core, and valve seat, from the inner cavity connected to the extended valve cover and valve body. This allows for complete disassembly of the valve internals, enabling quick and easy online maintenance by pulling the entire valve out from the top. It eliminates the need to open the cold box and remove the perlite inside, facilitating valve maintenance, reducing labor intensity, significantly shortening maintenance time, and improving work efficiency. Attached Figure Description

[0014] Figure 1 This is a cross-sectional schematic diagram of the overall structure of the cryogenic regulating valve for a fully-operated cold box according to this utility model;

[0015] As shown in the figure: 1. Valve body, 2. Extended valve cover, 3. Extended valve stem, 4. Valve seat, 5. Valve core, 6. Valve cover, 7. Valve cage, 8. Spring-loaded packing, 9. Valve stem, 10. Connecting flange, 11. Sealing ring. Detailed Implementation

[0016] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0017] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0019] Example 1

[0020] As shown in the figure, an extension valve cover 2 is provided between the valve cover 6 and the valve body 1. One end of the valve cover 6 and the extension valve cover 2 are fixedly connected by bolts, and the other end of the extension valve cover 2 is connected to the valve body 1. A valve cage 7 is provided inside the extension valve cover 2. One end of the valve cage 7 is connected to the valve seat 4 by a threaded installation. A valve core 5 is provided inside the valve seat 4. An extension valve stem 3 is provided between the valve core 5 and the valve stem 9. One end of the valve core 5 is connected to the extension valve stem 3, and the other end of the extension valve stem 3 is connected to the valve stem 9. The valve stem 9 passes through the center of the valve cover 6 and extends out. A spring-loaded packing 8 is provided between the valve stem 9 and the valve cover 6.

[0021] A sealing ring 11 is provided at the connection between the valve seat 4 and the valve body 1, and the sealing ring 11 is set in the mounting groove provided on the valve seat 4. The extended valve stem 3 is located inside the extended valve cover 2, and the extended valve cover 2 is provided with a connecting flange 10 on the outside. When this utility model is installed, it is installed on the cold box through the connecting flange 10, so that the extended valve cover and the valve body 1 are located in the perlite inside the cold box. By designing the extended valve stem 3 and the extended valve cover 2, the control stroke of the regulating valve is extended, so that the valve stem 9 and the valve cover 6 of the driving part are located outside the cold box, thereby avoiding the spring-loaded packing 8 between the valve stem 9 and the valve cover 6 from losing its elasticity due to the low temperature, which would reduce the sealing performance of the connection.

[0022] Example 2

[0023] The regulating valve designed in this utility model is installed on the cold box via the connecting flange 10. The extended valve cover 2 and the valve body 1 are located inside the perlite in the cold box. When maintenance is required, simply unscrew the fixing bolts on the valve cover 6 and remove the valve cover 6. Then, by pulling the valve cage 7 outward, the valve stem 9, extended valve stem 3, valve core 5, and valve seat 4 can be pulled out from the inner cavity after the extended valve cover 2 and valve body 1 are connected. This allows for the complete disassembly of the internal components of the regulating valve. It can be quickly pulled out from the top of the valve for online maintenance without opening the cold box or removing the perlite inside. This not only facilitates the maintenance of the regulating valve and reduces the labor intensity of the workers, but also greatly shortens the maintenance time and improves work efficiency.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fully-operated cryogenic regulating valve for a cold box, characterized in that... The valve includes a valve body, a valve stem, an extension valve stem, an extension valve cover, a valve core, a valve seat, and a valve cage. An extension valve cover is provided between the valve cover and the valve body. One end of the valve cover and the extension valve cover are fixedly connected by bolts, and the other end of the extension valve cover is connected to the valve body. A valve cage is provided inside the extension valve cover. The valve seat is connected to the valve cage by threaded installation. A valve core is provided inside the valve seat. An extension valve stem is provided between the valve core and the valve stem. One end of the valve core is connected to the extension valve stem, and the other end of the extension valve stem is connected to the valve stem.

2. The cryogenic regulating valve for a fully drawn cold box according to claim 1, characterized in that... The valve stem passes through and extends from the center of the valve cover, and spring-loaded packing is provided between the valve stem and the valve cover.

3. The cryogenic regulating valve for a fully drawn cold box according to claim 1, characterized in that... A sealing ring is provided at the connection between the valve seat and the valve body, and the sealing ring is set in the mounting groove provided on the valve seat.

4. The cryogenic regulating valve for a fully drawn cold box according to claim 1, characterized in that... The extended valve stem is located inside the extended valve cover, and the extended valve cover is provided with a connecting flange on the outside.

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