A baffle pressure reducing cage type control valve

Abstract

The utility model relates to the technical field of cage type control valve of baffle pressure reduction, disclose a kind of cage type control valve of baffle pressure reduction, including valve body, the valve body is connected with bonnet by stud, nut and winding pad, winding pad one is provided in the valve body, baffle ring support seat is provided on winding pad one, lower baffle ring assembly is provided in the below of baffle ring support seat, upper baffle ring assembly is pressed and is placed in the above of lower baffle ring assembly, upper baffle ring assembly is sealed between lower valve cage by winding pad two, the utility model is small in size, light in weight, few vulnerable parts, maintenance is simple, processing and manufacturing and installation are convenient to disassemble, structure is advanced and reasonable, with unique baffle type fluid passage, make fluid multidirectional, multiple layer pressure reduction, control flow rate, reduce noise, resist scouring, prevent steam erosion, resist vibration, applicable to petroleum, chemical industry and other industries in with cavitation, flash evaporation, steam erosion, have vibration tendency harsh severe working condition and high pressure difference, high noise fluid control occasion.

Description

Technical Field

[0001] This utility model relates to the technical field of baffle-type pressure reducing cage control valves, specifically a baffle-type pressure reducing cage control valve. Background Technology

[0002] In industries such as petroleum, chemical, and metallurgy, fluid control conditions are complex and varied, placing extremely high demands on the performance of control valves. Many conditions involve cavitation, flashing, and vibration, requiring valves to possess characteristics such as low unbalanced force, low leakage, and low noise to ensure the safe, stable, and efficient operation of the production process. As a key piece of equipment in fluid control, the performance of control valves directly affects the reliability and economy of the entire industrial process. Traditional cage-type control valves, developed in the 1980s and 1990s, mainly consist of components such as the valve body, valve cover, valve core, valve stem, valve cage, and valve seat. The valve body has an inlet at one end and an outlet at the other, and the valve core can move up and down under the guidance of the valve cage. However, with the continuous advancement of industrial technology, its drawbacks have gradually become apparent when facing harsh conditions with large pressure differentials and high flow velocities. When a large pressure differential fluid flows through the valve, the stability of traditional cage valves is poor. Due to the limitations of the structural design, the valve core is prone to swaying and displacement under the force of the fluid, making it impossible to accurately control the fluid flow rate, thus affecting the stability of the entire process. Meanwhile, the high-speed passage of fluids with large pressure differentials through valves generates loud noise, disrupting normal factory production. Furthermore, traditional cage valves have limited pressure reduction capabilities, failing to effectively lower fluid pressure and velocity, leading to cavitation and flashing phenomena under high pressure differentials. The collapse of bubbles generated by cavitation can cause cavitation damage to valve internals, shortening valve lifespan and, in severe cases, even triggering safety accidents, threatening the safe operation of the entire production system. To address the performance deficiencies of traditional cage valves under harsh operating conditions and meet the increasingly stringent fluid control requirements of industries such as petroleum, chemical, and metallurgy, the development of new control valves is urgently needed. Based on this, the baffle-type pressure-reducing cage valve has emerged, aiming to overcome the shortcomings of existing technologies and provide a more efficient and reliable solution for industrial fluid control. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a baffle-type pressure-reducing control valve.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a baffle-type pressure-reducing control valve, comprising a valve body, wherein the valve body is connected to a valve cover by studs, nuts and spiral wound gaskets, a spiral wound gasket is disposed inside the valve body, a baffle ring support seat is disposed on the spiral wound gasket, a lower baffle ring assembly is disposed below the baffle ring support seat, an upper baffle ring assembly is pressed on top of the lower baffle ring assembly, a spiral wound gasket is disposed between the upper baffle ring assembly and the lower valve cage for sealing, an upper valve cage is disposed above the lower valve cage, and a sealing ring is disposed between the lower valve cage and the upper valve cage.

[0005] As a further description of the above technical solution:

[0006] The valve body has a medium inlet at one end and a medium outlet at the other end, with the channel being S-shaped.

[0007] As a further description of the above technical solution:

[0008] The valve body is provided with a core rod assembly, which is located in the lower valve cage and the upper valve cage. The core rod assembly includes a valve stem and a valve core. The bottom end of the valve stem and the valve core are connected by circumferential welding. The valve stem and the valve cover are sealed by packing. A pad is provided between the packing. The top end of the valve stem can be connected to a linear pneumatic actuator.

[0009] As a further description of the above technical solution:

[0010] The valve stem is secured at the top of the valve cover by a round nut, a packing gland, and a packing plate.

[0011] As a further description of the above technical solution:

[0012] The core rod assembly is guided by the lower and upper valve cages and can move linearly up and down under the drive of the linear pneumatic actuator. When the valve core moves up and down, it can change the flow cross-sectional area of ​​the fluid and adjust the flow rate and control pressure of the fluid.

[0013] As a further description of the above technical solution:

[0014] The medium is throttled in stages by a multi-layered baffle ring formed by the combination of the lower baffle ring assembly and the upper baffle ring assembly, which continuously changes the direction of the fluid and increases the flow resistance. This causes a certain amount of energy to be consumed at each throttling stage, thereby reducing the flow velocity.

[0015] As a further description of the above technical solution:

[0016] The lower deflector ring assembly includes a lower deflector ring seat, a first lower deflector ring, and a second lower deflector ring, which are connected by circumferential welding. The upper deflector ring assembly includes an upper deflector ring and an upper deflector ring seat, which are connected by circumferential welding.

[0017] This utility model has the following beneficial effects:

[0018] 1. Small size, light weight, few vulnerable parts, simple maintenance, convenient processing, manufacturing, installation and disassembly. It is developed and designed based on the principles of standardization, universality, interchangeability and flexibility. It has an advanced and reasonable structure and a unique baffled fluid channel, which allows the fluid to be depressurized in multiple directions and layers, control the flow rate, reduce noise, resist erosion, prevent cavitation and resist vibration.

[0019] 2. Applicable to harsh working conditions with cavitation, flashing, cavitation, and vibration tendency in industries such as petroleum, chemical, metallurgy, power plants, and natural gas, as well as high pressure differential and high noise fluid control applications. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the overall structure of a baffle-type pressure-reducing control valve proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the external structure of the core rod assembly of a baffle-type pressure-reducing cage control valve proposed in this utility model;

[0022] Figure 3 This is a schematic diagram of the external structure of the lower baffle ring assembly of a baffle-type pressure-reducing cage control valve proposed in this utility model.

[0023] Figure 4 This is a partial external structural diagram of a baffle-type pressure-reducing control valve proposed in this utility model.

[0024] Legend:

[0025] 1. Valve body; 2. Baffle ring support seat; 3. Lower baffle ring assembly; 3-1. Lower baffle ring seat; 3-2. Lower baffle ring one; 3-3. Lower baffle ring two; 4. Upper baffle ring assembly; 4-1. Upper baffle ring; 4-2. Upper baffle ring seat; 5. Spiral wound gasket one; 6. Spiral wound gasket two; 7. Core rod assembly; 7-1. Valve stem; 7-2. Valve core; 8. Lower valve cage; 9. Sealing ring; 10. Upper valve cage; 11. Valve cover; 12. Packing; 13. Gasket block; 14. Round nut; 15. Packing gland; 16. Packing pressure plate. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The utility model will be further described in detail below with reference to the accompanying drawings.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example 1

[0029] like Figures 1 to 4 As shown, this embodiment provides a baffle-type pressure-reducing control valve, including: a valve body 1, which is connected to a valve cover 11 by studs, nuts and spiral wound gaskets. A spiral wound gasket 5 is provided inside the valve body 1, and a baffle ring support 2 is provided on the spiral wound gasket 5. A lower baffle ring assembly 3 is provided below the baffle ring support 2, and an upper baffle ring assembly 4 is pressed on top of the lower baffle ring assembly 3. A spiral wound gasket 6 is provided between the upper baffle ring assembly 4 and the lower valve cage 8 for sealing. An upper valve cage 10 is provided above the lower valve cage 8, and a sealing ring 9 is provided between the lower valve cage 8 and the upper valve cage 10.

[0030] In this embodiment, the baffle ring support 2 provides an installation base for the upper and lower baffle ring assemblies. Its structural configuration matches the size of the baffle ring assembly, ensuring that the multi-stage baffle rings form a stable graded throttling path in the fluid channel.

[0031] Specifically, one end of the valve body 1 is provided with a medium inlet, and the other end of the valve body 1 is provided with a medium outlet, and the channel is S-shaped.

[0032] In this embodiment, the S-shaped streamlined channel and the internal baffle ring structure work together to allow the medium to first pass through the streamlined channel to adjust its flow direction after entering the valve body 1, and then enter the multi-stage baffle ring for graded pressure reduction, thereby further improving the stability of fluid control.

[0033] Specifically, a core rod assembly 7 is provided inside the valve body 1. The core rod assembly 7 is located inside the lower valve cage 8 and the upper valve cage 10. The core rod assembly 7 includes a valve stem 7-1 and a valve core 7-2. The bottom end of the valve stem 7-1 and the valve core 7-2 are connected by circumferential welding. The valve stem 7-1 and the valve cover 11 are sealed by packing 12. A pad 13 is provided between the packing 12. The top end of the valve stem 7-1 can be connected to a linear pneumatic actuator.

[0034] The bottom end of the valve stem 7-1 is inserted into the central hole of the valve core 7-2. An annular sealing groove is provided on the upper part of the valve cover 11. The packing 12 is filled in the annular sealing groove and sleeved on the outer circumferential surface of the valve stem 7-1. The inner sidewall of the packing 12 is tightly fitted with the outer wall of the valve stem 7-1, thereby achieving a dynamic seal between the valve stem 7-1 and the valve cover 11.

[0035] A pad 13 is also provided between the packing 12. The pad 13 is sleeved on the outer periphery of the valve stem 7-1 and located between two adjacent layers of packing 12. It is used to separate the packing and evenly transmit the compaction force, further improving the sealing reliability, and at the same time reducing the frictional resistance between the valve stem 7-1 and the packing 12 when the valve stem 7-1 moves. The connection end between the valve stem 7-1 and the valve core 7-2 is also fixed by circumferential welding, which enhances the structural strength on the basis of mechanical connection and avoids connection failure under high pressure differential conditions.

[0036] As a preferred implementation, the circumferential welding process ensures the overall strength of the core rod assembly and is suitable for high pressure differential conditions; through the sealing of the packing 12 and the cooperation of the pad 13, the leakage of the medium along the valve stem 7-1 can be effectively prevented, while reducing the movement resistance of the valve stem 7-1.

[0037] Specifically, the valve stem 7-1 is fixed at the top of the valve cover 11 by a round nut 14, a packing gland 15, and a packing pressure plate 16.

[0038] It should be noted that the valve stem 7-1 is fixed to the top of the valve cover 11 by the round nut 14, the packing gland 15, and the packing pressure plate 16, forming a multi-stage compression structure. The clamping force of the packing gland 15 is adjusted by the round nut 14, so that the packing pressure plate 16 uniformly compresses the packing 12, ensuring the sealing performance of the valve stem.

[0039] Specifically, the core rod assembly 7 is guided by the lower valve cage 8 and the upper valve cage 10. Driven by the linear pneumatic actuator, it can move up and down in a linear reciprocating motion. When the valve core 7-2 moves up and down, it can change the flow cross-sectional area of ​​the fluid and adjust and control the fluid flow rate and control pressure.

[0040] As a preferred implementation method, the guide structure of the valve cage can suppress the vibration of the valve core under high pressure differential, and together with the linear actuator, it can achieve fast and stable adjustment to meet the control requirements under harsh working conditions. Example 2

[0041] Specifically, the medium is throttled in stages by a multi-layered baffle ring formed by the combination of the lower baffle ring assembly 3 and the upper baffle ring assembly 4, which continuously changes the direction of the fluid and increases the flow resistance. This causes a certain amount of energy to be consumed at each throttling stage, thereby reducing the flow velocity.

[0042] It should be noted that each throttling stage consumes the kinetic energy of the medium, reducing the flow velocity. Multi-stage energy dissipation avoids high pressure differentials at a single throttling point, fundamentally suppressing cavitation, flashing, and cavitation phenomena. The number, aperture, and arrangement of the baffle rings are optimized through 3D CFD simulation. Appropriate combinations can effectively control the medium's flow velocity, continuously changing the fluid direction and increasing flow resistance, thereby achieving pressure reduction, noise reduction, and vibration resistance.

[0043] Specifically, the lower deflector ring assembly 3 includes a lower deflector ring seat 3-1, a lower deflector ring one 3-2, and a lower deflector ring two 3-3, and the lower deflector ring seat 3-1, the lower deflector ring one 3-2, and the lower deflector ring two 3-3 are connected by circumferential welding. The upper deflector ring assembly 4 includes an upper deflector ring 4-1 and an upper deflector ring seat 4-2, and the upper deflector ring 4-1 and the upper deflector ring seat 4-2 are connected by circumferential welding.

[0044] In this embodiment, the lower baffle ring assembly adopts a "double baffle ring + base" structure, and the upper baffle ring assembly adopts a "single baffle ring + base" structure. The difference in the number of rings in the upper and lower components forms an asymmetrical throttling layout, which further enhances the effect of fluid direction change and energy dissipation, and is suitable for working conditions that require strong pressure reduction capabilities.

[0045] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A baffle-type pressure-reducing cage control valve, characterized in that: The valve body (1) is connected to the valve cover (11) by studs, nuts and spiral wound gaskets. A spiral wound gasket (5) is provided inside the valve body (1). A baffle ring support seat (2) is provided on the spiral wound gasket (5). A lower baffle ring assembly (3) is provided below the baffle ring support seat (2). An upper baffle ring assembly (4) is pressed on top of the lower baffle ring assembly (3). A spiral wound gasket (6) is provided between the upper baffle ring assembly (4) and the lower valve cage (8) for sealing. An upper valve cage (10) is provided above the lower valve cage (8), and a sealing ring (9) is provided between the lower valve cage (8) and the upper valve cage (10).

2. The baffle-type pressure-reducing control valve according to claim 1, characterized in that: The valve body (1) has a medium inlet at one end and a medium outlet at the other end, with the channel being S-shaped.

3. The baffle-type pressure-reducing cage control valve according to claim 1, characterized in that: The valve body (1) is provided with a core rod assembly (7), which is located in the lower valve cage (8) and the upper valve cage (10). The core rod assembly (7) includes a valve stem (7-1) and a valve core (7-2). The bottom end of the valve stem (7-1) and the valve core (7-2) are connected by circumferential welding. The valve stem (7-1) and the valve cover (11) are sealed by packing (12). A pad (13) is provided between the packing (12). The top end of the valve stem (7-1) can be connected to a linear pneumatic actuator.

4. The baffle-type pressure-reducing cage control valve according to claim 1, characterized in that: The valve stem (7-1) is fixed at the top of the valve cover (11) by a round nut (14), a packing gland (15) and a packing plate (16).

5. A baffle-type pressure-reducing cage control valve according to claim 3, characterized in that: The core rod assembly (7) is guided by the lower valve cage (8) and the upper valve cage (10). Driven by the linear pneumatic actuator, it can move up and down in a linear reciprocating motion. When the valve core (7-2) moves up and down, it can change the flow cross-sectional area of ​​the fluid and adjust the flow rate and control pressure of the fluid.

6. The baffle-type pressure-reducing cage control valve according to claim 1, characterized in that: The multi-layer baffle ring formed by the combination of the lower baffle ring assembly (3) and the upper baffle ring assembly (4) causes the fluid direction to change continuously and increases the flow resistance. This results in a certain amount of energy being consumed at each throttling stage, thus reducing the flow velocity.

7. A baffle-type pressure-reducing cage control valve according to claim 6, characterized in that: The lower deflector ring assembly (3) includes a lower deflector ring seat (3-1), a lower deflector ring one (3-2), and a lower deflector ring two (3-3), and the lower deflector ring seat (3-1), the lower deflector ring one (3-2), and the lower deflector ring two (3-3) are connected by circumferential welding. The upper deflector ring assembly (4) includes an upper deflector ring (4-1) and an upper deflector ring seat (4-2), and the upper deflector ring (4-1) and the upper deflector ring seat (4-2) are connected by circumferential welding.

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