Regulating valve seat snap ring locking and centering structure

Abstract

The utility model relates to the technical field of regulating valves, in particular to a valve seat snap ring locking and centering structure of a regulating valve, which comprises a valve body, an inner flow passage arranged in the valve body, a stepped hole arranged at the center of the inner flow passage, an inner sealing ring arranged on the bottom wall of the stepped hole, and a valve seat component arranged at the stepped hole. The valve seat assembly comprises a first clamping ring arranged in the stepped hole, a center sealing ring is arranged above the first clamping ring, a second clamping ring is arranged above the center sealing ring, an upper valve seat is arranged above the second clamping ring, and the second clamping ring, the center sealing ring and the first clamping ring are tightly pressed on the bottom wall of the stepped hole through the upper valve seat. A lower valve seat is fixedly installed on the bottom face of the upper valve seat, the lower valve seat is tightly pressed on the inner sealing ring, and the upper valve seat, the second clamping ring and the first clamping ring are all detachably connected with the valve body. According to the utility model, the centering and fixing operation is convenient, and meanwhile, the sealing effect is better.

Description

Control valve seat retaining ring locking and centering structure Technical Field

[0001] This utility model relates to the field of regulating valve technology, and more specifically, to a regulating valve seat retaining ring locking and centering structure. Background Technology

[0002] In industrial fluid control systems, regulating valves are key actuators that control the flow rate within pipelines. The installation accuracy and sealing performance of the valve seat directly affect the system's operating efficiency and safety. Since the valve seat is installed inside the corresponding valve body, in order to ensure sealing and facilitate replacement after damage, most valve seats adopt a detachable structure.

[0003] However, traditional valve seat installation methods also have some shortcomings in use, such as low centering accuracy: existing valve seat installation structures mostly rely on manual experience for centering, which makes it difficult to ensure the coaxiality of the valve seat and the valve body flow channel, resulting in obstructed fluid flow, eddies and vibrations, and reduced valve regulation accuracy.

[0004] Furthermore, most valve seats suffer from poor locking reliability: when a single bolt or gland is used to fix the valve seat, it is prone to loosening under long-term high pressure, high temperature, or frequent opening and closing conditions, leading to media leakage and even equipment damage and safety accidents. With increasing industrial automation and increasingly stringent energy conservation and emission reduction requirements, higher expectations are placed on the performance and reliability of control valves. Therefore, a new structure that can achieve precise valve seat alignment, reliable locking, and easy maintenance is urgently needed. Summary of the Invention

[0005] The purpose of this invention is to provide a valve seat retaining ring locking and centering structure for regulating valves, so as to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A regulating valve seat retaining ring locking and centering structure includes a valve body with an inner flow channel. A stepped hole is located at the center of the inner flow channel, and an inner sealing ring is located on the bottom wall of the stepped hole. A valve seat assembly is located at the stepped hole. The valve seat assembly includes a first retaining ring disposed within the stepped hole, a central sealing ring above the first retaining ring, a second retaining ring above the central sealing ring, and an upper valve seat above the second retaining ring. The upper valve seat presses the second retaining ring, the central sealing ring, and the first retaining ring against the bottom wall of the stepped hole. A lower valve seat is fixedly installed on the bottom surface of the upper valve seat, pressing against the inner sealing ring. The upper valve seat, the second retaining ring, and the first retaining ring are all detachably connected to the valve body.

[0008] Preferably, a first stepped surface is provided on the bottom wall of the stepped hole, and the inner sealing ring abuts against the first stepped surface;

[0009] This feature makes the inner seal ring more stable during assembly.

[0010] Preferably, the size of the inner sealing ring is adapted to the size of the first stepped surface portion, and a central hole is provided at the center of the inner sealing ring.

[0011] Preferably, a second stepped surface is provided on the top wall of the stepped hole, and the upper valve seat presses the second retaining ring, the central sealing ring and the first retaining ring against the bottom wall of the second stepped surface.

[0012] Preferably, the upper valve seat, the second retaining ring, and the first retaining ring are all fixedly connected to the valve body by a plurality of fastening screws, and the size of the upper valve seat is adapted to the size of the second stepped surface portion.

[0013] Preferably, both the first retaining ring and the second retaining ring have a C-shaped cross-section, and both the first retaining ring and the second retaining ring are provided with an expansion gap;

[0014] This feature allows for expansion and contraction protection of the inner and central sealing rings using the expansion and contraction gap.

[0015] Preferably, a central sealing sleeve is also embedded in the upper valve seat, and both ends of the central sealing sleeve are integrally formed with end sealing rings. The upper end sealing ring abuts against the top surface of the upper valve seat, and the lower valve seat presses the lower end sealing ring against the upper surface of the inner sealing ring.

[0016] This setting can further improve the sealing effect and provide a further sealing operation for the valve core to press against the end sealing ring, ensuring the seal.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model achieves precise positioning and alignment of the valve seat assembly within the valve body by setting up structures such as stepped holes, a first retaining ring, and a second retaining ring. The stepped surface of the stepped hole provides a positioning reference for the valve seat assembly. The first and second retaining rings cooperate with the upper and lower valve seats to restrict the position of the valve seat within the valve body, ensuring that the valve seat is coaxial with the flow channel of the valve body, reducing fluid flow resistance, reducing eddies and vibrations, thereby improving the valve adjustment accuracy and enabling the regulating valve to more stably control the flow rate within the pipeline.

[0019] 2. This utility model achieves reliable locking of the valve seat by using multiple fastening screws to fix the upper valve seat, the second retaining ring, the first retaining ring, and the valve body. Compared with the traditional single bolt or gland fixation, this multi-fastening connection method can effectively distribute the force under high pressure, high temperature, or frequent opening and closing conditions, reduce the risk of loosening, prevent media leakage, reduce the probability of equipment damage and safety accidents, and ensure the safe and stable operation of the industrial fluid control system.

[0020] 3. This utility model achieves excellent sealing performance through the setting of multiple sealing structures such as inner sealing ring, central sealing ring, central sealing sleeve and end sealing ring. The inner sealing ring and central sealing ring provide sealing at the bottom and middle of the valve seat respectively. The central sealing sleeve and end sealing ring further enhance the sealing effect, providing a good foundation for valve core sealing. The multiple seals work together to effectively prevent media leakage, meet the strict requirements of industrial automation for the sealing performance of control valves, and improve equipment reliability and service life. Attached Figure Description

[0021] Figure 1 is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 is a partial structural schematic diagram of this utility model;

[0023] Figure 3 is an exploded structural diagram of the valve seat assembly of this utility model;

[0024] The meanings of the labels in the diagram are as follows:

[0025] 1. Valve body; 10. Inner flow channel; 11. Stepped hole; 12. First stepped surface; 13. Second stepped surface;

[0026] 2. Inner sealing ring; 20. Center hole;

[0027] 3. Valve seat assembly; 30. First retaining ring; 31. Central sealing ring; 32. Second retaining ring; 33. Expansion / contraction clearance; 34. Upper valve seat; 35. Lower valve seat; 36. Central sealing sleeve; 37. End sealing ring. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0029] Please refer to Figures 1-3. This utility model provides a technical solution: a valve seat retaining ring locking and centering structure, including a valve body 1, an inner flow channel 10 is provided inside the valve body 1, a stepped hole 11 is provided at the center of the inner flow channel 10, an inner sealing ring 2 is provided on the bottom wall of the stepped hole 11, a first stepped surface 12 is provided on the bottom hole wall of the stepped hole 11, the inner sealing ring 2 abuts against the first stepped surface 12, the size of the inner sealing ring 2 is adapted to the size of the first stepped surface 12, a center hole 20 is provided at the center of the inner sealing ring 2, the setting of the center hole 20 does not affect the flow of fluid, the inner sealing ring 2 provides a stable sealing base for the valve seat assembly 3, ensures the sealing performance of the valve seat assembly during installation, and prevents fluid leakage from the bottom.

[0030] It is worth noting that a valve seat assembly 3 is provided at the stepped hole 11. The valve seat assembly 3 includes a first retaining ring 30 disposed within the stepped hole 11, a central sealing ring 31 disposed above the first retaining ring 30, a second retaining ring 32 disposed above the central sealing ring 31, and an upper valve seat 34 disposed above the second retaining ring 32. The upper valve seat 34 presses the second retaining ring 32, the central sealing ring 31, and the first retaining ring 30 against the bottom wall of the stepped hole 11. A lower valve seat 35 is fixedly installed on the bottom surface of the upper valve seat 34, pressing against the inner sealing ring 2. The upper valve seat 34, the second retaining ring 32, and the first retaining ring 30 are all detachably connected to the valve body 1. A [missing information - likely a design element] is provided on the top wall of the stepped hole 11. On the second step surface 13, the upper valve seat 34 presses the second retaining ring 32, the central sealing ring 31, and the first retaining ring 30 onto the bottom wall of the second step surface 13. The upper valve seat 34, the second retaining ring 32, and the first retaining ring 30 are all fixedly connected to the valve body 1 by multiple fastening screws. The size of the upper valve seat 34 is adapted to the size of the second step surface 13. Through size adaptation and the use of fastening screws, it can be ensured that the screws can be fixedly installed only after they correspond to the threaded holes. This achieves precise positioning and reliable fixation of the valve seat assembly in the valve body, allowing the valve seat to be better aligned with the flow channel of the valve body, reducing fluid flow resistance. Furthermore, the fastening method can effectively cope with high pressure and other working conditions, preventing leakage caused by loosening.

[0031] As shown in Figure 3, the cross-sections of the first retaining ring 30 and the second retaining ring 32 are both C-shaped. Both the first retaining ring 30 and the second retaining ring 32 are provided with expansion and contraction gaps 33. When the valve seat assembly expands and contracts due to factors such as temperature changes, the expansion and contraction gaps 33 can provide buffer space for the inner sealing ring 2 and the central sealing ring 31, preventing damage to the sealing ring due to excessive compression or pulling, effectively protecting the sealing structure, extending the service life of the sealing ring, and maintaining good sealing performance.

[0032] As shown in Figure 3, a central sealing sleeve 36 is also embedded in the upper valve seat 34. Both ends of the central sealing sleeve 36 are integrally formed with end sealing rings 37. The upper end sealing ring 37 abuts against the top surface of the upper valve seat 34, and the lower valve seat 35 presses the lower end sealing ring 37 against the upper surface of the inner sealing ring 2 to form a multi-seal structure, which further improves the sealing effect and provides a better foundation for the subsequent valve core and end sealing ring 37 to cooperate to achieve sealing, greatly reducing the possibility of medium leakage and ensuring the sealing reliability of the regulating valve.

[0033] When using the regulating valve seat retaining ring locking and centering structure of this utility model, first place the inner sealing ring 2 on the first step surface 12 of the bottom wall of the step hole 11 in the inner flow channel 10 of the valve body 1. Utilize its matching size and center hole 20 to lay the foundation for bottom sealing. Then, place the first retaining ring 30, the center sealing ring 31, and the second retaining ring 32 into the step hole 11 in sequence. Place the upper valve seat 34 and the lower valve seat 35 as a whole into the step hole 11. Fix the upper valve seat 34, the second retaining ring 32, and the first retaining ring 30 to the valve body 1 with multiple fastening screws to complete the installation. At this time, the upper valve seat 34 presses the second retaining ring 32, the center sealing ring 31, and the first retaining ring 30 against the bottom wall of the second step surface 13, and the upper valve seat 34 presses the inner sealing ring 2 against the bottom surface of the first step surface 12.

[0034] During operation, the expansion gap 33 protects the inner sealing ring 2 and the central sealing ring 31 under conditions such as temperature changes. The multiple sealing structure ensures that the medium does not leak. If maintenance is required, unscrew the fastening screws and remove the upper valve seat 34, the second retaining ring 32 and the first retaining ring 30 to inspect and replace the valve seat assembly 3 and the inner sealing ring 2, etc., to ensure the continuous and stable operation of the regulating valve.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A regulating valve seat retaining ring locking and centering structure, comprising a valve body (1), characterized in that: The valve body (1) has an internal flow channel (10) and a stepped hole (11) at the center of the internal flow channel (10). An internal sealing ring (2) is provided on the bottom wall of the stepped hole (11). A valve seat assembly (3) is provided at the stepped hole (11). The valve seat assembly (3) includes a first retaining ring (30) disposed in the stepped hole (11). A central sealing ring (31) is provided above the first retaining ring (30), and a second retaining ring (32) is provided above the central sealing ring (31). An upper valve seat (34) is provided above the second retaining ring (32). The upper valve seat (34) presses the second retaining ring (32), the central sealing ring (31) and the first retaining ring (30) against the bottom wall of the stepped hole (11). A lower valve seat (35) is fixedly installed on the bottom surface of the upper valve seat (34). The lower valve seat (35) presses against the inner sealing ring (2). The upper valve seat (34), the second retaining ring (32) and the first retaining ring (30) are all detachably connected to the valve body (1).

2. The regulating valve seat retaining ring locking and centering structure according to claim 1, characterized in that: The bottom wall of the stepped hole (11) is provided with a first stepped surface (12), and the inner sealing ring (2) abuts against the first stepped surface (12).

3. The regulating valve seat retaining ring locking and centering structure according to claim 2, characterized in that: The size of the inner sealing ring (2) is adapted to the size of the first step surface (12), and a central hole (20) is provided at the center of the inner sealing ring (2).

4. The regulating valve seat retaining ring locking and centering structure according to claim 1, characterized in that: The top wall of the stepped hole (11) is provided with a second stepped surface (13), and the upper valve seat (34) presses the second retaining ring (32), the central sealing ring (31) and the first retaining ring (30) onto the bottom wall of the second stepped surface (13).

5. The regulating valve seat retaining ring locking and centering structure according to claim 4, characterized in that: The upper valve seat (34), the second retaining ring (32) and the first retaining ring (30) are all fixedly connected to the valve body (1) by a plurality of fastening screws. The size of the upper valve seat (34) is adapted to the size of the second step surface (13).

6. The regulating valve seat retaining ring locking and centering structure according to claim 1, characterized in that: The cross-sections of the first retaining ring (30) and the second retaining ring (32) are both C-shaped, and expansion and contraction gaps (33) are provided on the first retaining ring (30) and the second retaining ring (32).

7. The regulating valve seat retaining ring locking and centering structure according to claim 1, characterized in that: The upper valve seat (34) is also fitted with a central sealing sleeve (36). Both ends of the central sealing sleeve (36) are integrally formed with end sealing rings (37). The upper end sealing ring (37) abuts against the top surface of the upper valve seat (34), and the lower valve seat (35) presses the lower end sealing ring (37) against the upper surface of the inner sealing ring (2).

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