Complete drawing type cryogenic regulating valve for cold box

Abstract

The invention 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 invention, 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] The present invention relates to the technical field of cold box regulating valves, and particularly to an integral extraction type cryogenic regulating valve for a cold box. Background Art

[0002] In the cryogenic air separation industry, many regulating valves need to work in a low-temperature environment. At present, most of them are to install the valve inside the cold box and fill the other empty positions inside the cold box with heat-insulating materials (perlite) to keep it cold.

[0003] However, since the valve needs to be regularly maintained, it is necessary to remove all the heat-insulating materials in the cold box, that is, perlite, before maintenance. And to ensure safety, when removing the sand, it is also necessary to heat and reheate the cryogenic air separation cold box to normal temperature to prevent the internal from containing cryogenic liquid, resulting in safety production accidents during the sand removal process. For a cryogenic air separation cold box with an oxygen production capacity of 20,000 m3 / h, it takes about 10 days for heating, sand removal, maintenance, and refilling with sand. Such a large-scale cryogenic air separation cold box not only has a long maintenance time and high cost, affecting the production efficiency of cryogenic air separation equipment, but also the labor intensity of sand removal is much greater than that of valve maintenance. And for some imported valve enterprises, valve maintenance requires special tools and special personnel, and the maintenance cost is extremely high, bringing troubles to many enterprises.

[0004] In view of the above problems, we design an integral extraction type cryogenic regulating valve for a cold box with a structural form convenient for on-line valve maintenance. Summary of the Invention

[0005] According to the above existing technical problems, the present invention provides an integral extraction type cryogenic regulating valve for a cold box, which realizes the integral extraction and disassembly of the valve internals, can be quickly taken out from the top of the valve for on-line maintenance, and does not require opening the cold box and the operation of removing the perlite in the cold box.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] The integral extraction type cryogenic regulating valve for a cold box is characterized by comprising a valve body, a valve stem, an extended valve stem, an extended valve cover, a valve core, a valve seat, and a valve cage. An extended valve cover is arranged between the connection of the valve cover and the valve body. One end of the valve cover and the extended valve cover is fixedly connected by bolts, the other end of the extended valve cover is connected to the valve body. The valve cage is arranged inside the extended valve cover. The valve seat is connected to the valve cage by means of threaded installation. The valve core is arranged inside the valve seat. An extended valve stem is arranged between the valve core and the valve stem. One end of the valve core is connected to the extended valve stem, and the other end of the extended valve stem is connected to the valve stem.

[0008] The valve stem passes through and extends from the central position of the valve cover, and a spring-loaded packing is arranged between the connection of 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 arranged in the installation 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 this connecting flange, the regulating valve is installed on the cold box.

[0011] Advantages of the present invention:

[0012] In the present invention, by designing the extended valve stem and the extended valve cover, the control stroke of the regulating valve is extended, ensuring that both the valve body and a part of the pipeline to be connected are located inside the cold box, while the valve stem and the valve cover of the driving part are located outside the cold box, avoiding the reduction of the elasticity of the spring-loaded packing filled between the valve stem and the valve cover due to low temperature, which affects the sealing performance of the connection.

[0013] In the present invention, the designed valve seat is threadedly connected to the valve cage in the extended valve cover. During maintenance, after removing the valve cover, by pulling the valve cage outwards, the integral valve internals composed of the valve stem, the extended valve stem, the valve core and the valve seat can be withdrawn from the inner cavity after the connection of the extended valve cover and the valve body, thus realizing the integral extraction and disassembly of the valve internals during disassembly. It can be quickly withdrawn as a whole from the top of the valve for on-line maintenance, without opening the cold box and removing the perlite sand inside the cold box. This not only facilitates the maintenance operation of the regulating valve, reduces the labor intensity of the staff, but also greatly shortens the maintenance time required and improves work efficiency. Description of the drawings

[0014] Figure 1 It is a cross-sectional view of the overall structure of the integral extraction type cryogenic regulating valve of the present invention;

[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 manners

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0018] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0019] Embodiment 1

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

[0021] Among them, a sealing ring 11 is provided at the connection of the valve seat 4 and the valve body 1, and the sealing ring 11 is arranged in the installation groove provided on the valve seat 4. The extended valve stem 3 is located inside the extended valve cover 2, and a connection flange 10 is provided outside the extended valve cover 2. When the present invention is installed, the present invention is installed on the cold box through the connection flange 10, so that the extended valve cover and the valve body 1 are located in the perlite sand 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 both located outside the cold box, thereby avoiding the spring-loaded packing 8 filled between the valve stem 9 and the valve cover 6 from losing its elasticity slowly due to the influence of low temperature, resulting in a reduction in the sealing performance of the connection.

[0022] Embodiment 2

[0023] For the regulating valve designed by the present invention, after it is installed on the cold box through the connecting flange 10, the extended valve cover 2 and the valve body 1 are located in the perlite sand of the cold box. When maintenance is required, only the fixing bolts on the valve cover 6 need to be unscrewed, and after the valve cover 6 is removed, by pulling the valve cage 7 outwards, the valve stem 9, the extended valve stem 3, the valve core 5 and the valve seat 4 as a whole can be withdrawn from the inner cavity after the connection of the extended valve cover 2 and the valve body 1, so as to realize the integral extraction and disassembly of the valve internals of the regulating valve, and it can be quickly extracted as a whole from the top of the valve for on-line maintenance without opening the cold box and removing the perlite sand in the cold box. This not only facilitates the maintenance operation of the regulating valve, reduces the labor intensity of the staff, but also greatly shortens the time required for maintenance and improves work efficiency.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. Each component mentioned in the present invention is a common technology in the existing field. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. The integral extraction type cryogenic box cryogenic regulating valve is characterized in that It includes a valve body, a valve stem, an extended valve stem, an extended valve cover, a valve core, a valve seat and a valve cage. An extended valve cover is provided between the connection of the valve cover and the valve body. One end of the valve cover and the extended valve cover is fixedly connected by bolts. The other end of the extended valve cover is connected to the valve body. A valve cage is arranged inside the extended valve cover. The valve seat is connected to the valve cage by means of threaded installation. A valve core is arranged inside the valve seat. An extended valve stem is arranged between the valve core and the valve stem. One end of the valve core is connected to the extended valve stem. The other end of the extended valve stem is connected to the valve stem.

2. The integral extraction type cryogenic box cryogenic regulating valve according to claim 1, characterized in that The valve stem passes through and extends from the central position of the valve cover, and a spring-loaded packing is provided between the connection of the valve stem and the valve cover.

3. The integral extraction type cold box cryogenic regulating valve 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 arranged in the installation groove provided on the valve seat.

4. The integral extraction type cryogenic box cryogenic regulating valve according to claim 1, wherein The extended valve stem is located inside the extended valve cover, and a connection flange is provided outside the extended valve cover.

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