Ferrule plug valve

Abstract

The utility model discloses a clamping sleeve plug valve which comprises a valve body, a flow channel is formed in the valve body, a plug body and a valve rod are arranged in the valve body, an actuator is arranged on the valve body and controls the plug body to rotate, a sealing assembly is arranged in the valve body and comprises a sealing lining, padding and packing, and the sealing lining is arranged on the valve rod. The sealing bush is arranged on the periphery of the plug body, a sealing gap is formed between the periphery of the valve rod and the valve body, padding and packing are arranged in the sealing gap, the padding is closer to the plug body than the packing, the sealing assembly further comprises an extrusion part, and the extrusion part extrudes the packing and the padding. The valve body is provided with a driving block extending towards the direction of the sealing bush. The utility model has the following advantages and effects: multi-section sealing is adopted, the sealing performance of the valve body can be better enhanced, the sealing performance of the valve body can be ensured through adjustment, and the driving block is arranged, so that the service life of a sealing piece can be ensured.

Description

Technical Field

[0001] The utility model relates to the field of valves, and more specifically, to a ferrule plug valve. Background Art

[0002] As a key actuating element in the field of fluid control, the plug valve is widely used in industrial pipeline systems such as petrochemical industry, pharmaceutical equipment and food processing due to its simple structure and rapid opening and closing. The traditional ferrule type plug valve mainly realizes sealing through the interference fit between the conical plug and the valve body cavity, and forms the main sealing pair through the conical surface fit between the polytetrafluoroethylene sealing bushing and the metal plug. However, this structure has significant defects in practical applications: insufficient sealing performance. At the same time, due to the uneven distribution of contact stress in the traditional single-stage conical surface sealing structure, local sealing failure is likely to occur, resulting in medium leakage. And although it can compensate for the wear of the sealing surface to a certain extent, there are problems such as complex structure and high maintenance cost. Content of the Utility Model

[0003] The utility model provides a ferrule plug valve, aiming to solve the problem of insufficient sealing performance of the ferrule plug valve in the prior art.

[0004] To achieve the above object, the utility model provides the following technical solution: a ferrule plug valve, including a valve body, a flow channel is formed in the valve body, a plug body and a valve stem are arranged in the valve body, an actuator is arranged on the valve body, and the actuator controls the rotation of the plug body. It is characterized in that: a sealing assembly is arranged in the valve body, the sealing assembly includes a sealing bushing, packing and gland, the sealing bushing is arranged on the outer periphery of the plug body, a sealing gap is formed between the outer periphery of the valve stem and the valve body, packing and gland are arranged in the sealing gap, the packing is closer to the plug body than the gland, the sealing assembly further includes an extrusion member, the extrusion member extrudes the gland and the packing, and a driving block extending towards the direction of the sealing bushing is arranged on the valve body.

[0005] The utility model is further arranged as: lips are protruded on the sealing bushing, and the lips are symmetrically arranged on the sealing bushing.

[0006] The utility model is further arranged as: the extrusion member includes a driving member, an extrusion rod and a driving rod, a driving clamping block for cooperating with the extrusion rod protrudes from one end of the driving block facing away from the sealing bushing, the driving rod and the extrusion rod both slide in the valve body, and a driving inclined surface for driving the extrusion rod to move is formed on the driving rod, and the driving member drives the movement of the driving rod.

[0007] The present utility model is further configured as follows: The driving member includes a bolt and a driving groove. The driving groove includes a threaded section and a driving section, and the threaded section is located at the upper end of the driving groove. The driving groove communicates with a sliding groove, and the driving rod slides in the sliding groove. One end of the driving rod forms an abutting block, and a part of the abutting block is located in the driving groove. When the bolt fixes the valve body, the bolt presses the driving rod to move.

[0008] The present utility model is further configured as follows: A first disc spring is arranged in the sliding groove. The first disc spring is sleeved on the driving rod and abuts tightly against the abutting block.

[0009] The present utility model is further configured as follows: A limiting edge is formed on the driving block, and a scraping end is formed at one end of the driving block close to the sealing bushing.

[0010] The present utility model is further configured as follows: The pressing member further includes a sealing gland, a sealing screw rod, and a sealing nut. One end of the sealing gland protrudes to form a pressing portion. The sealing gland is sleeved on the valve rod, and the pressing portion is located in the sealing gap. Both the sealing gland and the valve body are provided with sealing grooves for cooperating with the sealing screw rod. The sealing nut is connected to the sealing screw rod and fixes the sealing gland to the valve body. A sealing disc spring is sleeved on the sealing screw rod and is located between the sealing nut and the sealing valve cover.

[0011] The present utility model has the following effects: By setting triple seals, the valve can be better sealed. At the same time, a pressing member is provided, which can effectively press the packing and the packing gland. And a driving block is provided, and a scraping end is arranged on the driving block, so that the scraping end can scrape away the medium during opening and closing, preventing jamming and locking, and effectively protecting the ferrule. Description of the Drawings

[0012] Figure 1 is a structural diagram of an embodiment of the present utility model;

[0013] Figure 2 is an enlarged view of part A;

[0014] Figure 3 is an enlarged view of part B.

[0015] In the figure: 1, valve body; 21, sealing bushing; 211, lip; 22, packing; 23, packing gland; 24, sealing gap; 3, driving block; 31, driving member; 32, pressing rod; 33, driving rod; 35, driving block; 36, driving slope; 4, bolt; 41, driving groove; 411, driving section; 42, abutting block; 44, first disc spring; 5, limiting edge; 51, scraping end; 53, sealing gland; 54, sealing screw rod; 55, sealing nut; 56, pressing portion. Detailed Description of the Embodiment

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

[0017] In the description of the present utility model, 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 accompanying drawings. It is only for the convenience of describing the present utility model 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 cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0018] Refer to Figures 1 to 3 A further description is made of the embodiments of the present utility model.

[0019] A ferrule plug valve includes a valve body 1. A flow channel is formed in the valve body 1. A plug body and a valve stem are arranged in the valve body 1. An actuator is arranged on the valve body 1, and the actuator controls the rotation of the plug body. A sealing assembly is arranged in the valve body 1. The sealing assembly includes a sealing bushing 21, packing 22 and packing gland 23. The sealing bushing 21 is arranged on the outer periphery of the plug body. A sealing gap 24 is formed between the outer periphery of the valve stem and the valve body 1. The packing 22 and the packing gland 23 are arranged in the sealing gap 24. That is, the flexible graphite packing 22 and the aramid fiber woven packing gland 23 are sequentially filled in the annular sealing gap 24 between the valve stem and the valve body 1. The packing 22 is closer to the plug body than the packing gland 23. The sealing assembly further includes an extrusion member. An extrusion member made of metal is installed above the sealing gap 24. The extrusion member applies an axial pressure to the packing gland 23 and the packing 22, prompting the two to expand radially to fill the sealing gap 24, forming a double dynamic seal. The extrusion member extrudes the packing gland 23 and the packing 22. A driving block 3 extending in the direction of the sealing bushing 21 is arranged on the valve body 1. The driving block 3 can scrape away the medium during opening and closing to prevent jamming and anti-lock, effectively protecting the ferrule. A sealing bushing 21 made of polytetrafluoroethylene is tightly sleeved on the outer periphery of the plug body, forming a first sealing surface with the inner wall of the valve body 1. When the valve is opened, the actuator drives the valve stem to rotate 90°, aligning the through hole of the plug body with the flow channel; when closed, it rotates 90° in the reverse direction, and the plug body blocks the flow channel. The combined seal of the packing 22 and the packing gland 23 can dynamically adapt to the friction generated by the rotation of the valve stem. The pre-tightening force of the extrusion member can be compensated for wear through an adjusting bolt 4 to ensure long-term sealing reliability.

[0020] In another embodiment, the filler 22 can be made of carbon fiber reinforced composite material, and the packing 23 is replaced with a wound metal gasket to adapt to higher temperature or pressure conditions. This significantly improves the sealing performance and service life of the valve under high-pressure and high-wear conditions. At the same time, the modular design facilitates maintenance and component replacement.

[0021] A lip 211 protrudes from the sealing bushing 21, and the lip 211 is symmetrically arranged on the sealing bushing 21. The symmetrically distributed lip 211 structure can also be coated with a rubber or silicone coating to improve the elastic recovery performance. This design combines the symmetric elastic deformation of the lip 211 with the mechanical strengthening of the driving block 3 to effectively prevent medium leakage under high-pressure and high-frequency opening and closing conditions. At the same time, it reduces the risk of permanent deformation of the sealing bushing 21 and extends the service life of the valve.

[0022] The extrusion member includes a driving member 31, an extrusion rod 32, and a driving rod 33. A driving clamping block 35 that cooperates with the extrusion rod 32 protrudes from one end of the driving block 3 facing away from the sealing bushing 21. The driving rod 33 and the extrusion rod 32 both slide in the valve body 1, and a driving inclined surface 36 for driving the extrusion rod 32 to move is formed on the driving rod 33. The driving member 31 drives the movement of the driving rod 33. Through the structure of the driving member 31, the extrusion rod 32, and the driving rod 33, it is then possible to rely on the driving of the driving member 31 to drive the driving rod 33 to slide, drive the movement of the extrusion rod 32, and make the driving block 3 move towards the plug body direction, enabling the adjustment of the driving block 3 to ensure that the scraping end 51 can scrape away the medium when the valve is opened and closed, preventing jamming and anti-lock, effectively protecting the ferrule. At the same time, it is possible to adjust the driving block 3 after long-term use to ensure that it does not fail.

[0023] The driving member 31 includes a bolt 4 and a driving groove 41. The driving groove 41 includes a threaded section and a driving section 411, and the threaded section is located at the upper end of the driving groove 41. The driving groove 41 communicates with a sliding groove. The driving rod 33 slides in the sliding groove. One end of the driving rod 33 forms an abutting block 42, and the abutting block 42 is partially located in the driving groove 41. When the bolt 4 fixes the valve body 1, the bolt 4 squeezes the driving rod 33 to move. When the bolt 4 is threadedly connected to the driving groove 41, the threaded section cooperates with the bolt 4 for threaded connection. Then, when continuing to rotate, the top of the bolt 4 can continue to move downward to squeeze the abutting block 42, and then drive the movement of the driving rod 33.

[0024] A first disc spring 44 is arranged in the sliding groove. The first disc spring 44 is sleeved on the driving rod 33 and abuts tightly against the abutting block 42. After the bolt 4 is retracted, it can drive the driving rod 33 to reset, which is convenient for operation, practical, and simple.

[0025] A limiting edge 5 is formed on the driving block 3, and a groove matching therewith is provided on the valve body. The limiting edge 5 slides in the groove. One end of the driving block 3 close to the sealing bushing 21 forms a scraping end 51. When the valve is opened and closed, the scraping end 51 can scrape away the medium when the valve is switched, preventing jamming and anti-lock, effectively protecting the ferrule. The limiting edge 5 can limit the driving block to prevent it from getting out of position, and also limit the lateral sliding of the driving block 3 to prevent it from getting out of position.

[0026] The pressing member further includes a sealing gland 53, a sealing screw 54 and a sealing nut 55. One end of the sealing gland 53 protrudes to form a pressing portion 56. The sealing gland 53 is sleeved on the valve stem, and the pressing portion 56 is located in the sealing gap 24. Both the sealing gland 53 and the valve body 1 are provided with sealing grooves for mating with the sealing screw 54. The sealing nut 55 is connected to the sealing screw 54 and fixes the sealing gland 53 to the valve body 1. A sealing disc spring is sleeved on the sealing screw 54 between the sealing nut 55 and the sealing valve cover. The cooperation of the sealing nut 55 and the sealing screw 54 can seal the sealing gland 53. The sealing gland 53 is of an annular structure and is threadedly connected to the valve body 1 through the sealing screw 54 and the sealing nut 55. When the bolt 4 is tightened, the pressing member applies an axial pressure to the packing 23 and the stuffing 22, prompting them to expand radially to fill the sealing gap 24, forming a double dynamic seal.

[0027] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A sleeve plug valve, comprising a valve body, a flow channel formed in the valve body, a plug body and a valve stem arranged in the valve body, an actuator arranged on the valve body, the actuator controlling the rotation of the plug body, characterized in that: A sealing assembly is arranged in the valve body, and the sealing assembly includes a sealing bushing, a stuffing and a packing. The sealing bushing is arranged on the outer periphery of the plug body, and a sealing gap is formed between the outer periphery of the valve stem and the valve body. The stuffing and the packing are arranged in the sealing gap, and the stuffing is closer to the plug body than the packing. The sealing assembly also includes an extrusion, and the extrusion extrude the packing and the stuffing. A driving block extending toward the sealing bushing is arranged on the valve body.

2. A sleeve plug valve according to claim 1, characterized in that: A lip is protruded from the sealing bushing, and the lip is symmetrically arranged on the sealing bushing.

3. A sleeve plug valve according to claim 2, characterized in that: The extrusion member includes a driving member, an extrusion rod and a driving rod. A driving block that cooperates with the extrusion rod protrudes from one end of the driving block facing away from the sealing bushing. The driving rod and the extrusion rod both slide on the valve body, and a driving inclined surface that drives the extrusion rod to move is formed on the driving rod. The driving member drives the movement of the driving rod.

4. A sleeve plug valve according to claim 3, characterized in that: The driving member includes a bolt and a driving groove, the driving groove includes a threaded section and a driving section, and the threaded section is located at the upper end of the driving groove, the driving groove is connected to a sliding groove, the driving rod slides in the sliding groove, an abutment block is formed at one end of the driving rod, and the abutment block is partially located in the driving groove, and when the bolt fixes the valve body, the bolt squeezes the driving rod to move.

5. A sleeve plug valve according to claim 4, characterized in that: A first disc spring is arranged in the sliding groove, and the first disc spring is sleeved on the driving rod and is tightly attached to the abutment block.

6. A sleeve plug valve according to claim 4, characterized in that: A limiting edge is formed on the driving block, and a scraping end is formed on one end of the driving block close to the sealing bushing.

7. The ferrule plug valve according to claim 1, characterized in that: The extrusion part also includes a sealing cover, a sealing screw and a sealing nut. One end of the sealing cover protrudes to form an extrusion portion. The sealing cover is sleeved on the valve stem, and the extrusion portion is located in the sealing gap. The sealing cover and the valve body are both provided with sealing grooves that match the sealing screw. The sealing nut is connected to the sealing screw and fixes the sealing cover to the valve body. The sealing screw is sleeved with a sealing disc spring located between the sealing nut and the sealing valve cover.

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