High-temperature and high-pressure control valve and upper valve cover thereof

Abstract

The high-temperature and high-pressure control valve comprises a valve cover body and a packing sealing assembly, a clamping sleeve and a packing hole are arranged in the valve cover body, a part of structure of the packing sealing assembly is arranged in the packing hole, and the clamping sleeve is used for introducing cooling water; the valve rod penetrates through the valve deck body, at least part of the valve rod structurally penetrates through the packing sealing assembly, and the packing sealing assembly is in rotary sealing connection with the valve rod and is in sealing connection with the inner wall of the packing hole. The packing sealing assembly sequentially comprises a first elastic pre-pressing piece, first sealing packing, a partition piece, second sealing packing, a second elastic pre-pressing piece and a packing pressing plate, the first elastic pre-pressing piece is arranged at the hole bottom of the packing hole, and the packing pressing plate is arranged outside the packing hole and connected with the valve deck body through a connecting piece; the filler pressing plate presses the first sealing filler and the second sealing filler to achieve sealing and meanwhile presses the first elastic pre-pressing piece and the second elastic pre-pressing piece to generate pre-pressing elastic force.

Description

Technical Field

[0001] This utility model belongs to the field of control valve technology, and in particular relates to a high temperature and high pressure control valve and its upper valve cover. Background Technology

[0002] In industrial process control systems, control valves play a crucial role as key devices for regulating parameters such as fluid flow rate, pressure, temperature, and level. According to the International Electrotechnical Commission (IEC), a control valve is a power-operated device that changes the flow rate of fluid by adjusting the position of a flow-blocking element within the valve. This device typically consists of two parts: an actuator and a valve. The actuator operates based on signals from the control system, while the valve includes key components such as the valve body, internal parts, upper valve cover, and stuffing box.

[0003] In practical applications, control valve assemblies are relatively complex, including not only the basic valve body, internal components, and upper valve cover, but also a stuffing box for sealing, an actuator to provide operating force, and various accessories. These components work together to ensure that the control valve can accurately and reliably complete fluid control tasks.

[0004] Depending on their application, control valves can be divided into two main categories: regulating valves and shut-off valves. Regulating valves can precisely adjust various parameters of a fluid as needed, such as flow rate, pressure, temperature, and liquid level, and are suitable for industrial processes requiring fine control. Shut-off valves, on the other hand, are mainly used to quickly and accurately cut off fluid flow. They typically have a large flow capacity to ensure rapid closure in emergencies, preventing fluid leakage or the escalation of accidents.

[0005] In control valve design, the stuffing box is a key component for preventing media leakage, and its performance directly affects the valve's sealing performance and reliability. Currently, the most commonly used packing materials are polytetrafluoroethylene (PTFE) packing and graphite asbestos packing. These packings are typically used in combination with packing glands to form a specific sealing structure. Under normal temperature and pressure operating conditions, this packing combination structure has good practicality and can meet basic sealing requirements.

[0006] However, with the continuous development of industrial technology, the working environment faced by control valves is becoming increasingly complex and harsh. Especially under extreme conditions such as high temperature and high pressure, the temperature and pressure resistance of traditional packing assemblies are severely affected, leading to decreased sealing performance and even safety problems such as media leakage. This not only affects the normal operation of industrial processes but may also pose a serious threat to the environment and personnel safety. Utility Model Content

[0007] To address the aforementioned problems, the purpose of this utility model is to provide a high-temperature and high-pressure control valve and its upper valve cover, which is heat-resistant and has good sealing performance.

[0008] To achieve the above object, the technical scheme of the utility model is:

[0009] An upper valve cover for a high-temperature and high-pressure control valve, comprising a valve cover body and a packing seal assembly, a jacket and a packing hole are arranged in the valve cover body, part of the structure of the packing seal assembly is arranged in the packing hole, the jacket is used for passing in cooling water;

[0010] A valve rod is arranged in the valve cover body and at least part of the structure is arranged in the packing seal assembly, the packing seal assembly is in rotary sealing connection with the valve rod, and the packing seal assembly is in sealing connection with the inner wall of the packing hole;

[0011] The packing seal assembly comprises a first elastic pre-pressing piece, a first sealing packing, a separator, a second sealing packing, a second elastic pre-pressing piece and a packing pressing plate in sequence, the first elastic pre-pressing piece is arranged on the bottom of the packing hole, and the packing pressing plate is arranged outside the packing hole and is connected with the valve cover body through a connecting piece;

[0012] The packing pressing plate presses the first sealing packing and the second sealing packing to realize sealing, and presses the first elastic pre-pressing piece and the second elastic pre-pressing piece to make them generate pre-pressing elastic force.

[0013] According to an embodiment of the utility model, a packing pressing cover is arranged between the second sealing packing and the second elastic pre-pressing piece, and the packing pressing cover is in sealing connection with the valve rod and the inner wall of the packing hole.

[0014] According to an embodiment of the utility model, first and second O-shaped rings are arranged between the packing pressing cover and the valve rod and the inner wall of the packing hole.

[0015] According to an embodiment of the utility model, the first and second elastic pre-pressing pieces are first and second disc springs respectively, and the second disc spring is arranged outside the packing hole.

[0016] According to an embodiment of the utility model, the separator is a lantern sleeve, and the valve rod is rotatably connected to the lantern sleeve.

[0017] According to an embodiment of the utility model, the first sealing packing is made of flexible graphite or braided graphite, and the second sealing packing is made of reinforced polytetrafluoroethylene.

[0018] According to an embodiment of the utility model, the connecting piece is a bolt.

[0019] According to an embodiment of the utility model, a temperature sensor is arranged in the valve cover body.

[0020] According to the utility model one embodiment, including import flange and export flange, be equipped with respectively both sides of the valve cover body and all with the jacket inside communication.

[0021] Based on the same concept, the utility model also provides a high temperature and high pressure control valve, including the upper valve cover for high temperature and high pressure control valve of any one embodiment described above.

[0022] The utility model discloses the above technical scheme, compared with prior art has the following advantages and positive effect:

[0023] By passing cooling water in the jacket, the utility model effectively reduces the temperature of the valve cover body and the first sealing packing and the second sealing packing, effectively prevents material expansion, deformation or aging caused by high temperature, thereby ensuring the stability of the sealing structure and the long-lasting sealing performance.

[0024] The double-layer design of the first sealing packing and the second sealing packing not only enhances the level of sealing, but also significantly improves the overall sealing effect. This design effectively blocks the leakage path of the medium by increasing the number and complexity of the sealing interface, improving the reliability and safety of the sealing.

[0025] The utility model discloses the first disc spring and the second disc spring are innovatively set up, and the double disc spring loading mechanism is formed. This design can provide continuous and stable pre-tightening force when facing high temperature and high pressure medium working condition and local wear of sealing packing caused by frequent action of valve stem, ensure that enough sealing pressure can be maintained even under extreme conditions, effectively prevent medium leakage, and prolong the service life of the valve. BRIEF DESCRIPTION OF DRAWINGS

[0026] The specific embodiments of the utility model will be further described in detail below in combination with the drawings, wherein:

[0027] Fig. 1 It is the sectional view of the utility model;

[0028] Fig. 2 It is the temperature control loop schematic diagram of the utility model.

[0029] MARKED FOR EXPLANATION:

[0030] 1, valve cover body;2, import flange;3, jacket;4, first disc spring;5, first sealing packing;6, lantern sleeve;7, second sealing packing;8, second O ring;9, packing gland;10, first O ring;11, second disc spring;12, packing pressing plate;13, temperature sensor;14, valve stem;15, export flange. DETAILED DESCRIPTION

[0031] The utility model will be further explained in detail below in combination with the drawings and specific embodiments. The advantages and features of the utility model will be more apparent according to the following description. It should be noted that all the drawings are in a very simplified form and all use non-precise ratios, only for the purpose of facilitating and clearly assisting the explanation of the utility model embodiments.

[0032] It should be noted that all the directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0033] Embodiment 1

[0034] Referring to Figs. 1-2 The core of the utility model is to provide a valve cover for high-temperature and high-pressure control valve, which comprises a valve cover body 1 and a packing seal assembly, a jacket 3 and a packing hole are arranged in the valve cover body 1, and part of the structure of the packing seal assembly is arranged in the packing hole; the jacket 3 is used for passing in cooling water.

[0035] The valve stem 14 is arranged in the valve cover body 1 and at least part of the structure is arranged in the packing seal assembly; the packing seal assembly is in rotational sealing connection with the valve stem 14, and the packing seal assembly is in sealing connection with the inner wall of the packing hole.

[0036] The packing seal assembly comprises a first elastic pre-pressing piece, a first sealing packing 5, a separator, a second sealing packing 7, a second elastic pre-pressing piece and a packing pressing plate 12 in sequence; the first elastic pre-pressing piece is arranged on the bottom of the packing hole; and the packing pressing plate 12 is arranged outside the packing hole and connected with the valve cover body 1 through a connecting piece.

[0037] The packing pressing plate 12 presses the first sealing packing 5 and the second sealing packing 7 to realize sealing, and simultaneously presses the first elastic pre-pressing piece and the second elastic pre-pressing piece to make them generate pre-pressing elastic force. The first sealing packing 5 and the second sealing packing 7 can be an integrated packing or a packing combination.

[0038] Further, the packing pressing cover 9 is arranged between the second sealing packing 7 and the second elastic pre-pressing piece, and the packing pressing cover 9 is in sealing connection with the valve stem 14 and the inner wall of the packing hole. First O-rings 10 and second O-rings 8 are arranged between the packing pressing cover 9 and the valve stem 14 and the inner wall of the packing hole respectively. The medium can be further prevented from overflowing from the valve stem 14 or the packing pressing cover 9.

[0039] The first elastic pre-pressing part and the second elastic pre-pressing part are respectively a first disc spring 4 and a second disc spring 11, and the second disc spring 11 is arranged outside the packing hole.

[0040] The connecting piece is a bolt, and the packing pressing plate 12 is adjustably connected to the upper end of the valve cover body 1 through the bolt, and the pressing force of the packing pressing plate 12 can be adjusted through the bolt.

[0041] The valve cover body 1 is provided with a temperature sensor 13 for real-time monitoring of the temperature, and cooling water is introduced into the jacket 3 if the temperature is too high. The temperature sensor 13 is connected to a temperature transmitter, collects information about the relationship between the process temperature variable and the required set point, and then controls the control unit to control the cooling water switch to realize the circulation and suspension of the cooling water in the jacket 3.

[0042] The utility model also comprises an inlet flange 2 and an outlet flange 15 arranged on both sides of the valve cover body 1 and in communication with the inside of the jacket 3, and the inlet flange 2 and the outlet flange 15 are used for connecting the condensate water pipeline. Then, the condensate water switch is opened or closed according to the temperature detected by the temperature sensor 13, and if the control switch is opened, the condensate water enters the inside of the jacket 3 for cooling circulation, and the temperature of the valve cover body 1 and the first sealing packing 5 and the second sealing packing 7 decreases; if the control switch is closed, the condensate water does not circulate in the jacket 3, and the medium temperature is gradually conducted to the valve cover body 1 and the first sealing packing 5 and the second sealing packing 7.

[0043] By introducing cooling water into the jacket 3, the temperature of the valve cover body 1 and the first sealing packing 5 and the second sealing packing 7 is effectively reduced, the material expansion, deformation or aging caused by high temperature is effectively prevented, and the stability of the sealing structure and the long-term sealing performance are ensured.

[0044] The double-layer design of the first sealing packing 5 and the second sealing packing 7 not only enhances the level of sealing, but also significantly improves the overall sealing effect. This design effectively blocks the leakage path of the medium by increasing the number and complexity of the sealing interface, and improves the reliability and safety of the sealing.

[0045] The utility model innovatively sets up first disc spring 4 and second disc spring 11, forms double -deck disc spring loading mechanism. This design can provide sustained and stable pre -tightening force when facing high temperature and high pressure medium working condition and the local wear of sealing packing caused by frequent action of valve stem 14, ensure that even in extreme conditions can maintain sufficient sealing pressure, effectively prevent medium leakage, prolong the service life of valve.

[0046] Embodiment 2

[0047] The utility model discloses a high temperature and high pressure control valve, including the upper valve cover for high temperature and high pressure control valve of embodiment 1.

[0048] The utility model discloses a combination structure of jacketed upper valve cover+double -deck packing+double -deck disc spring loading+temperature control, can use in high temperature and high pressure work. Use the utility model discloses a combination structure of jacketed upper valve cover+double -deck packing+double -deck disc spring loading+temperature control, can use in high temperature and high pressure work. Use the utility model, under high temperature and high pressure, have the cooling of sealing packing and multistage sealing protection, guarantee control valve in the running process sealing packing sealed no leakage. The whole packing sealing assembly is according to the principle of temperature descending gradually, forms the structure of multichannel sealing protection.

[0049] The above describes the embodiment of the utility model in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment. Even if various changes are made to the utility model, if the changes fall within the scope of the utility model claims and equivalent technology, they still fall within the protection scope of the utility model.

Claims

1. An upper valve cover for a high-temperature and high-pressure control valve, characterized in that, The device includes a valve cover body and a packing seal assembly. The valve cover body has a jacket and a packing hole. A portion of the packing seal assembly is located inside the packing hole. The jacket is used to allow cooling water to pass through. The valve stem passes through the valve cover body and at least a portion of its structure passes through the packing seal assembly. The packing seal assembly is rotatably sealed to the valve stem, and simultaneously sealed to the inner wall of the packing hole. The packing sealing assembly sequentially includes a first elastic pre-compression member, a first sealing packing, a separator, a second sealing packing, a second elastic pre-compression member, and a packing pressure plate. The first elastic pre-compression member is disposed on the bottom of the packing hole, and the packing pressure plate is disposed outside the packing hole and connected to the valve cover body through a connector. The packing pressure plate presses the first sealing packing and the second sealing packing to achieve a seal, and at the same time presses the first elastic pre-compression member and the second elastic pre-compression member to generate a pre-compression elastic force.

2. The upper valve cover for a high-temperature and high-pressure control valve according to claim 1, characterized in that, It includes a packing gland disposed between the second sealing packing and the second elastic pre-compression member, wherein the packing gland is sealed to the valve stem and the inner wall of the packing hole.

3. The upper valve cover for a high-temperature and high-pressure control valve according to claim 2, characterized in that, A first O-ring and a second O-ring are respectively provided between the packing gland and the inner wall of the valve stem and the packing hole.

4. The upper valve cover for a high-temperature and high-pressure control valve according to claim 1, characterized in that, The first elastic preload member and the second elastic preload member are respectively a first disc spring and a second disc spring, and the second disc spring is located outside the packing hole.

5. The upper valve cover for a high-temperature and high-pressure control valve according to claim 1, characterized in that, The separator is a lantern sleeve, and the valve stem is rotatably connected to the lantern sleeve.

6. The upper valve cover for a high-temperature and high-pressure control valve according to claim 1, characterized in that, The first sealing filler is made of flexible graphite or braided graphite, and the second sealing filler is made of reinforced polytetrafluoroethylene.

7. The upper valve cover for a high-temperature and high-pressure control valve according to claim 1, characterized in that, The connecting component is a bolt.

8. The upper valve cover for a high-temperature and high-pressure control valve according to claim 1, characterized in that, A temperature sensor is installed inside the valve cover.

9. The upper valve cover for a high-temperature and high-pressure control valve according to claim 1, characterized in that, It includes an inlet flange and an outlet flange, which are respectively located on both sides of the valve cover body and are both connected to the inside of the jacket.

10. A high-temperature and high-pressure control valve, characterized in that, Includes the upper valve cover for a high-temperature and high-pressure control valve as described in any one of claims 1 to 9.

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