Combined bonnet type high-temperature and high-pressure needle valve

Abstract

The invention relates to the technical field of needle valves, and discloses a combined bonnet type high-temperature and high-pressure needle valve which comprises a fixing assembly, a valve rod assembly penetrates through the middle of the fixing assembly, the lower end of the outer side of the valve rod assembly is sleeved with a nut assembly, a cover body assembly and a movable nut, and the nut assembly is sleeved with the upper end of the outer side of the cover body assembly. The movable nut is connected to the lower end of the outer side of the cover body assembly in a sleeving mode, and a valve body mechanism is arranged at the bottom end of the cover body assembly. Precise flow control and stable sealing under high-temperature and high-pressure working conditions are realized through an integrated collaborative structural design; the valve rod assembly adopts a structure that an operating rod, an upper valve rod, a lower valve rod and a valve head are coaxially fixed from top to bottom, and is matched with the guide of a valve rod channel of the upper valve body assembly, so that the lifting motion of the valve head is accurate and controllable, and the valve head can be tightly embedded into the matching part of a channel I of the lower valve body assembly and a blocking body to realize reliable opening and closing of a runner; a packing pressing block and a packing body are arranged in the cover body assembly, and the cover body assembly is arranged outside the valve rod assembly in a sleeving mode and limited through a valve cover.

Description

Technical Field

[0001] This invention relates to the field of needle valve technology, specifically a combined valve cap type high temperature and high pressure needle valve. Background Technology

[0002] In industrial sectors such as petrochemicals, nuclear power, and high-end equipment manufacturing, high-temperature and high-pressure needle valves, as key control components of media transmission systems, must withstand high pressure and high temperature loads under extreme working conditions for extended periods, while also requiring precise flow control capabilities and reliable sealing performance.

[0003] Most existing traditional high-temperature and high-pressure needle valves rely on a single packing to seal the gap between the valve stem and the valve cover, lacking a coordinated compaction mechanism. Furthermore, the connection stability between the cover and the valve body is insufficient. Under high-temperature and high-pressure cyclic loads, the packing is prone to loosening and the sealing at the connection point may fail, leading to leakage of the medium from the gap and seriously threatening the safety of the operating conditions. Valve stem assemblies often employ segmented, simple connections, lacking precise guiding structures. This makes them prone to misalignment during lifting and lowering, hindering a tight fit between the valve head and the flow channel, thus affecting opening and closing reliability and flow control accuracy. Secondly, the flow channel design has shortcomings. Traditional needle valves often use straight-through or simple right-angle flow channels. When high-temperature, high-pressure media flow through, they directly impact the valve head end face, causing significant flow resistance and accelerating valve head wear, leading to a shortened valve lifespan. While some valves feature a dual-channel structure, they lack a reasonable flow diversion and guiding design, resulting in a chaotic media flow path and further reducing flow control efficiency. This makes them unsuitable for the stringent requirements of industrial systems for media transmission stability and controllability. Summary of the Invention

[0004] The purpose of this invention is to address the problems of existing traditional high-temperature and high-pressure needle valves, such as the lack of a coordinated compaction mechanism in the sealing structure, insufficient connection stability, poor flow control accuracy due to the lack of precise guidance in the valve stem assembly, and unreasonable flow channel design that easily leads to valve head wear, high flow resistance, and low flow control efficiency. This invention provides a combined valve cap type high-temperature and high-pressure needle valve.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution: A combined valve cap type high temperature and high pressure needle valve includes a fixing assembly, a valve stem assembly passing through the middle of the fixing assembly, a nut assembly, a cover assembly and a swivel nut being sleeved on the lower outer side of the valve stem assembly, the nut assembly being sleeved on the upper outer side of the cover assembly, the swivel nut being sleeved on the lower outer side of the cover assembly, a valve body mechanism being provided at the bottom of the cover assembly, and a pipe interface one and a pipe interface two being provided at both ends of the valve body mechanism.

[0006] Furthermore, the fixing component includes a handle and a fixing screw. The fixing screw passes through the interior of both ends of the handle, and the top end of the valve stem assembly passes through the interior of the middle end of the handle. When the operator rotates the handle, the fixing screw passes through both ends of the handle to ensure operational stability.

[0007] Furthermore, the valve stem assembly includes an operating rod, an upper valve stem, a lower valve stem, and a valve head. The top end of the operating rod penetrates the interior of the middle section of the fixing assembly. The bottom ends of the lower valve stem and the valve head penetrate and are slidably connected to the upper interior of the valve body mechanism. The bottom end of the valve head penetrates and is slidably connected to the upper and lower interior of the valve body mechanism. By operating the fixing assembly to drive the valve stem assembly to rise and fall, the opening and closing control of the flow channel inside the valve head and valve body mechanism can be realized.

[0008] Furthermore, the bottom end of the operating lever is fixedly connected to the top axis of the upper valve stem, the top end of the lower valve stem is fixedly connected to the bottom axis of the upper valve stem, and the top end of the valve head is fixedly connected to the bottom end of the lower valve stem. Through the fixed connection between the upper and lower ends, the operating lever drives the upper valve stem, the lower valve stem, and the bottom valve head to move vertically up and down along the valve stem channel.

[0009] Furthermore, the nut assembly includes a locking nut and a through-plate nut. The upper outer side of the valve stem assembly passes through the inner shaft of the locking nut. The through-plate nut is located below the locking nut. Both the locking nut and the through-plate nut are sleeved on the outer side of the cover assembly. The inner ring of the locking nut is sleeved on the upper outer side of the cover assembly. The locking nut and the through-plate nut of the nut assembly are sleeved on the upper outer side of the valve cover.

[0010] Furthermore, the cover assembly includes a valve cover, a packing block, and a packing body. The lower outer half of the valve stem assembly passes through and is slidably connected to the inner shaft of the valve cover. The lower inner end of the nut assembly is sleeved on the upper outer end of the valve cover. The packing block and the packing body are disposed on the lower outer end of the valve stem assembly. The upper inner end of the swivel nut and the valve body mechanism is sleeved on the lower middle outer end of the valve cover. The swivel nut is sleeved on the lower outer end of the valve cover and the upper outer end of the upper valve body assembly, thereby achieving a stable connection between the cover assembly and the valve body mechanism.

[0011] Furthermore, the packing block and the packing body are disposed on the lower inner side of the valve cover, and the packing block and the packing body are further compacted by threaded fastening to enhance the sealing effect.

[0012] Furthermore, the valve body mechanism includes an upper valve body assembly and a lower valve body assembly. The outer bottom end of the cover assembly is connected to the upper inner end of the upper valve body assembly. The inner side of the live nut is sleeved on the upper outer end of the upper valve body assembly. The lower valve body assembly is located at the lower end of the upper valve body assembly. Pipe interface one and pipe interface two are respectively sleeved on the outer ends of the lower valve body assembly. The valve as a whole takes the valve body mechanism as the core of medium flow. The valve stem channel of the upper valve body assembly serves as the movement guide for the valve stem assembly. The channels one and two of the lower valve body assembly serve as the medium transmission path. By operating the fixed component to drive the valve stem assembly to rise and fall, the opening and closing control of the valve head and the internal flow channel of the valve body mechanism is realized.

[0013] Furthermore, the upper valve body assembly includes a valve stem channel and an inclined branch channel. The inclined branch channel is inclined at the bottom side of the valve stem channel. The bottom end of the inclined branch channel is connected to one end of the lower valve body assembly. The inclined end of the bottom end of the inclined branch channel faces one end of the second pipe interface. The lower end of the valve stem assembly is located above the end of the lower valve body assembly that is closer to the first pipe interface. The valve as a whole uses the valve body mechanism as the core of medium flow, and the valve stem channel of the upper valve body assembly serves as the movement guide for the valve stem assembly.

[0014] Furthermore, the lower valve body assembly includes a channel one, a blocking body, and a channel two. The valve stem assembly is located above the channel one. The blocking body is disposed between the connection point of the channel one and the channel two. The inner side of the pipe interface one is sleeved on the outer side of the outer end of the channel one, and the inner side of the pipe interface two is sleeved on the outer side of the outer end of the channel two, thereby blocking the connection between the channel one and the channel two and realizing the valve closure.

[0015] Compared with the prior art, the present invention provides a combined valve cap type high temperature and high pressure needle valve, which has the following beneficial effects: 1. This combined valve cap type high-temperature and high-pressure needle valve achieves precise flow control and stable sealing under high-temperature and high-pressure conditions through an integrated and coordinated structural design. The valve stem assembly adopts a structure in which the operating rod, upper valve stem, lower valve stem, and valve head are coaxially fixed from top to bottom. With the valve stem channel guide of the upper valve body assembly, the lifting and lowering movement of the valve head is precisely controllable and can be tightly embedded in the cooperation between the lower valve body assembly channel and the blocking body to achieve reliable opening and closing of the flow channel. The cover assembly has built-in packing blocks and packing bodies, which are sleeved on the outside of the valve stem assembly and limited by the valve cover to form a highly efficient dynamic seal. With the nut assembly and live nut sleeved on the outside, the sealing structure is compacted to enhance the anti-leakage capability, and a stable connection between the cover assembly and the valve body mechanism is achieved, effectively preventing the high-temperature and high-pressure medium from leaking from the valve stem gap or connection parts, and ensuring the safety of the working conditions.

[0016] 2. This combined valve cap type high-temperature and high-pressure needle valve features a slanted channel and dual-channel structure in its valve body mechanism. The slanted channel is inclined at the bottom of the valve stem channel and faces the second pipe interface, which guides the flow direction of the medium, reduces the direct impact of high-pressure medium on the valve head, reduces flow resistance and component wear, and extends the valve's service life. The lower valve body assembly separates the first and second channels through a barrier, and with the precise docking of the first and second pipe interfaces, the medium flow path is clear and orderly, improving fluid control efficiency. The overall structure has clear division of labor and coordinated operation of each component, which not only solves the problems of insufficient sealing reliability and easy wear of valve heads in traditional high-temperature and high-pressure needle valves, but also improves the accuracy of flow control through optimized flow channel design, making it suitable for the stringent requirements of high-temperature and high-pressure medium transmission in industrial fields. Attached Figure Description

[0017] Figure 1 A three-dimensional view showing the outer side of the overall structure of the present invention; Figure 2 This is a cross-sectional view showing the internal structure of the present invention. Figure 3 This is a cross-sectional three-dimensional view showing the internal structure of the overall structure and related structures of the cover assembly of the present invention; Figure 4 A three-dimensional perspective view showing the internal structure of the fixing component of the present invention (cut open). Figure 5 A three-dimensional perspective view showing the internal structure and positional relationship of other structures of the valve stem assembly of the present invention; Figure 6 A three-dimensional perspective cross-sectional view showing the positional relationship between the cover assembly and the valve body mechanism of the present invention; Figure 7 A three-dimensional perspective view showing the structural details of the valve stem assembly of the present invention; Figure 8 A three-dimensional perspective view showing the internal structural positional relationship of the valve stem assembly, upper valve body assembly and lower valve body assembly of the present invention; Figure 9 The above is a three-dimensional cross-sectional view showing the relevant structures of the upper valve body assembly and the lower valve body assembly of the present invention.

[0018] In the diagram: 1. Fixed assembly; 11. Handle; 12. Fixing screw; 2. Valve stem assembly; 21. Operating lever; 22. Upper valve stem; 23. Lower valve stem; 24. Valve head; 3. Nut assembly; 31. Locking nut; 32. Through-plate nut; 4. Cover assembly; 41. Valve cover; 42. Packing block; 43. Packing body; 5. Live nut; 6. Valve body mechanism; 61. Upper valve body assembly; 611. Valve stem channel; 612. Angled channel; 62. Lower valve body assembly; 621. Channel one; 622. Block; 623. Channel two; 7. Pipe interface one; 8. Pipe interface two. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1:

[0020] like Figure 2 and Figure 4 As shown, a combined valve cap type high temperature and high pressure needle valve includes a fixing component 1. The fixing component 1 includes a handle 11 and a fixing screw 12. The fixing screw 12 passes through the inside of both ends of the handle 11. When the operator rotates the handle 11, the fixing screw 12 passes through both ends of the handle 11 to ensure operational stability. like Figure 3 , Figure 7 , Figure 8 As shown, the valve stem assembly 2 passes through the middle of the fixed assembly 1, and the top of the valve stem assembly 2 passes through the middle of the handle 11. The valve stem assembly 2 includes an operating rod 21, an upper valve stem 22, a lower valve stem 23, and a valve head 24. The top of the operating rod 21 passes through the middle of the fixed assembly 1, and the bottom of the operating rod 21 is fixedly connected to the top axis of the upper valve stem 22. The top of the lower valve stem 23 is fixedly connected to the bottom axis of the upper valve stem 22, and the top of the valve head 24 is fixedly connected to the bottom of the lower valve stem 23. Through the fixed connection between the upper and lower ends, the operating rod 21 drives the upper valve stem 22, the lower valve stem 23, and the bottom valve head 24 to move vertically up and down along the valve stem channel 611. like Figure 1 As shown, the lower outer end of the valve stem assembly 2 is fitted with a nut assembly 3, a cover assembly 4, and a live nut 5. The nut assembly 3 is fitted onto the upper outer end of the cover assembly 4. The nut assembly 3 includes a locking nut 31 and a through-plate nut 32. The upper outer side of the valve stem assembly 2 passes through the inner shaft of the locking nut 31. The through-plate nut 32 is located below the locking nut 31. The locking nut 31 and the through-plate nut 32 of the nut assembly 3 are fitted onto the upper outer side of the valve cover 41. The packing block 42 and the packing body 43 are further compacted by threaded fastening to enhance the sealing effect. like Figure 3 and Figure 6As shown, the live nut 5 is sleeved on the lower outer side of the cover assembly 4, and the locking nut 31 and the through nut 32 are both sleeved on the outer side of the cover assembly 4. The inner ring of the locking nut 31 is sleeved on the upper outer side of the cover assembly 4. The cover assembly 4 includes a valve cover 41, a packing block 42 and a packing body 43. The lower outer side of the valve stem assembly 2 passes through and is slidably connected to the inner shaft of the valve cover 41. The lower inner side of the nut assembly 3 is sleeved on the upper outer side of the valve cover 41. The packing block 42 and the packing body 43 are located at the lower outer side of the valve stem assembly 2 and at the lower inner side of the valve cover 41. The packing block 42 and the packing body 43 are located at the lower inner side of the valve cover 41. The packing body 43 is tightly fitted to the valve stem surface and the inner wall of the valve cover by the compression of the packing block 42, forming a dynamic seal to prevent high temperature and high pressure medium from leaking from the gap between the valve stem and the valve cover. like Figure 6 As shown, a valve body mechanism 6 is provided at the bottom of the cover assembly 4. The bottom ends of the lower valve stem 23 and the valve head 24 are connected to the upper inner end of the valve body mechanism 6. The bottom end of the valve head 24 is connected to the upper and lower inner ends of the valve body mechanism 6. The upper inner end of the nut 5 and the valve body mechanism 6 are sleeved on the lower outer end of the valve cover 41. The valve body mechanism 6 includes an upper valve body assembly 61 and a lower valve body assembly 62. The outer bottom end of the cover assembly 4 is connected to the upper inner end of the upper valve body assembly 61. The inner side of the nut 5 is sleeved on the upper outer end of the upper valve body assembly 61. The lower valve body assembly 62 is located at the lower end of the upper valve body assembly 61. Pipe interface 1 7 and pipe interface 2 8 are respectively sleeved on the outer ends of the lower valve body assembly 62. Example 2:

[0021] like Figure 8 and Figure 9 As shown, the upper valve body assembly 61 includes a valve stem channel 611 and an inclined branch channel 612. The inclined branch channel 612 is inclined at the bottom side of the valve stem channel 611. The bottom end of the inclined branch channel 612 is adjacent to one end of the lower valve body assembly 62. The inclined end of the bottom end of the inclined branch channel 612 faces one end of the pipe interface 8. The lower end of the valve stem assembly 2 is located above the end of the lower valve body assembly 62 that is close to the pipe interface 7. This can guide the flow direction of the medium, reduce the direct impact of the medium on the valve head 24, and reduce the flow resistance and wear under high pressure conditions. The lower valve body assembly 62 includes a first channel 621, a blocking body 622, and a second channel 623. The valve stem assembly 2 is located above the first channel 621. The blocking body 622 is disposed between the connection point of the first channel 621 and the second channel 623. The inner side of the first pipe interface 7 is sleeved on the outer side of the outer end of the first channel 621, and the inner side of the second pipe interface 8 is sleeved on the outer side of the outer end of the second channel 623. The valve stem channel 611 of the upper valve body assembly 61 serves as the movement guide for the valve stem assembly 2, and the first channel 621 and the second channel 623 of the lower valve body assembly 62 serve as the medium transmission path. like Figures 1-6 and Figures 8-9As shown, the valve body mechanism 6 has a pipe interface 7 and a pipe interface 8 at both ends.

[0022] Working principle: such as Figures 1-9 As shown, the valve as a whole uses the valve body mechanism 6 as the core of the medium flow. The valve stem channel 611 of the upper valve body assembly 61 serves as the movement guide for the valve stem assembly 2, and the channels 621 and 623 of the lower valve body assembly 62 serve as the medium transmission path. By operating the fixing component 1, the valve stem assembly 2 is driven to rise and fall, thereby realizing the opening and closing control of the valve head 24 and the internal flow channel of the valve body mechanism 6. During operation, the operator rotates the handle 11. The fixing screw 12 passes through both ends of the handle 11 to ensure operational stability. The handle 11 drives the operating rod 21, which passes through its middle, to rotate synchronously. The rod 21, through the fixed connection between its upper and lower ends, drives the upper valve rod 22, the lower valve rod 23, and the valve head 24 at the bottom to move vertically up and down along the valve rod channel 611. When the handle 11 is turned clockwise, the valve rod assembly 2 moves downward, causing the valve head 24 to engage with the junction of channel 1 621 and the blocking body 622, blocking the connection between channel 1 621 and channel 2 623, thus closing the valve. When the handle 11 is turned counterclockwise, the valve rod assembly 2 is lifted upward, the valve head 24 disengages from channel 1 621, and channel 1 621 and channel 2 623 are connected, thus opening the valve.

[0023] During the medium flow process, the high-temperature and high-pressure medium connected to pipe interface 7 flows through channel 621 to the block 622, enters channel 623 through the opening and closing control of valve head 24, and finally flows out from pipe interface 8. The inclined branch channel 612 of the upper valve body assembly 61 is inclinedly set on the bottom side of the valve stem channel 611 and faces the direction of pipe interface 8. It can guide the flow direction of the medium, reduce the direct impact of the medium on valve head 24, and reduce flow resistance and wear under high pressure conditions.

[0024] In terms of sealing performance, the cover assembly 4 plays a core sealing role: the packing body 43 and packing block 42 at the lower inner end of the valve cover 41 are sleeved on the outer side of the valve stem assembly 2. The packing body 43 is tightly fitted to the valve stem surface and the inner wall of the valve cover by the compression of the packing block 42, forming a dynamic seal to prevent high temperature and high pressure medium from leaking from the gap between the valve stem and the valve cover; the locking nut 31 and through nut 32 of the nut assembly 3 are sleeved on the upper outer side of the valve cover 41. The packing block 42 and packing body 43 are further compacted by the threaded fastening to enhance the sealing effect; the slack nut 5 is sleeved on the lower outer side of the valve cover 41 and the upper outer side of the upper valve body assembly 61 to achieve a stable connection between the cover assembly 4 and the valve body mechanism 6, avoiding leakage caused by loose connection under high pressure.

Claims

1. A combined bonnet high temperature high pressure needle valve comprising a stationary assembly (1) characterized in that: The middle part of the fixed assembly (1) is penetrated by a valve stem assembly (2), which comprises an operating rod (21), an upper valve stem (22), a lower valve stem (23) and a valve head (24); The outer lower end of the valve stem assembly (2) is sleeved with a nut assembly (3), a cover assembly (4) and a movable nut (5), the nut assembly (3) is sleeved on the outer upper end of the cover assembly (4), the cover assembly (4) comprises a valve cover (41), a packing block (42) and a packing body (43), the outer lower half end of the valve stem assembly (2) penetrates and is slidingly connected to the inner shaft of the valve cover (41), The movable nut (5) is sleeved on the outer lower end of the cover assembly (4), the bottom end of the cover assembly (4) is provided with a valve body mechanism (6), the bottom end of the lower valve stem (23) and the valve head (24) penetrates and is slidingly connected to the inner upper end of the valve body mechanism (6), and the bottom end of the valve head (24) penetrates and is slidingly connected to the inner upper and lower ends of the valve body mechanism (6); The valve body mechanism (6) comprises an upper valve body assembly (61) and a lower valve body assembly (62), the bottom end of the cover assembly (4) is connected to the inner upper end of the upper valve body assembly (61) through penetration, and the inner side of the movable nut (5) is sleeved on the outer upper end of the upper valve body assembly (61); The upper valve body assembly (61) comprises a valve stem channel (611) and an inclined branch channel (612), the inclined branch channel (612) is inclined to the bottom end side of the valve stem channel (611), and the bottom end of the inclined branch channel (612) and one end of the lower valve body assembly (62); The lower valve body assembly (62) comprises a channel one (621), a blocking body (622) and a channel two (623), the blocking body (622) is arranged between the connection points of the channel one (621) and the channel two (623); Both ends of the valve body mechanism (6) are respectively provided with a pipeline interface one (7) and a pipeline interface two (8).

2. The combined bonnet high temperature high pressure needle valve according to claim 1, characterized in that: The fixed assembly (1) comprises a handle (11) and a fixed screw (12), the fixed screw (12) penetrates the inner part of both ends of the handle (11), and the top end of the valve stem assembly (2) penetrates the inner part of the middle end of the handle (11).

3. The union bonnet type high temperature and high pressure needle valve according to claim 1, characterized in that: The top end of the operating rod (21) penetrates the inner part of the middle end of the fixed assembly (1).

4. The union bonnet type high temperature and high pressure needle valve according to claim 1, characterized in that: The bottom end of the operating rod (21) is fixedly connected to the top end shaft center of the upper valve stem (22), the top end of the lower valve stem (23) is fixedly connected to the bottom end shaft center of the upper valve stem (22), and the top end of the valve head (24) is fixedly connected to the bottom end of the lower valve stem (23).

5. The union bonnet type high temperature and high pressure needle valve according to claim 1, characterized in that: The nut assembly (3) comprises a locking nut (31) and a through-plate nut (32), the outer side of the upper end of the valve stem assembly (2) penetrates the inner shaft of the locking nut (31), the through-plate nut (32) is arranged below the locking nut (31), and the locking nut (31) and the through-plate nut (32) are both sleeved on the outer side of the cover assembly (4), and the inner ring of the locking nut (31) is sleeved on the outer upper end of the cover assembly (4).

6. The union bonnet type high temperature and high pressure needle valve according to claim 1, characterized in that: The inner lower end of the nut assembly (3) is sleeved with the outer upper end of the bonnet (41), the packing block (42) and the packing body (43) are arranged at the outer lower end of the valve stem assembly (2), and the inner upper end of the active nut (5) and the valve body mechanism (6) is sleeved with the outer middle lower end of the bonnet (41).

7. The union bonnet type high temperature and high pressure needle valve according to claim 1, characterized in that: The packing block (42) and the packing body (43) are arranged at the inner middle lower end of the bonnet (41).

8. The union bonnet type high temperature and high pressure needle valve according to claim 1, characterized in that: The lower valve body assembly (62) is arranged at the lower end of the upper valve body assembly (61), and the pipeline interface one (7) and the pipeline interface two (8) are respectively arranged and sleeved at the outer sides of the two ends of the lower valve body assembly (62).

9. The union bonnet type high temperature and high pressure needle valve according to claim 1, characterized in that: The inclined end of the inclined branch channel (612) is inclined towards one end of the pipeline interface two (8), and the lower end of the valve stem assembly (2) is located above one end of the lower valve body assembly (62) close to the pipeline interface one (7).

10. The union bonnet type high temperature and high pressure needle valve according to claim 1, characterized in that: The valve stem assembly (2) is located above the channel one (621), the inner side of the pipeline interface one (7) is sleeved with the outer end of the outer side of the channel one (621), and the inner side of the pipeline interface two (8) is sleeved with the outer end of the outer side of the channel two (623).

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