Valve casting with damping function

Abstract

The utility model relates to valve manufacturing technical field, especially a valve casting with shock attenuation function, including the valve body of casting formation, valve cover, the valve body inner chamber is provided with the valve seat and with the valve seat cooperation's valve flap and is used for driving the valve rod of connection valve flap, is located the mounting surface of valve seat, the support structure / guiding structure of valve flap or the corresponding casting body of valve rod's through -out part, is provided with built -in shock attenuation unit, and the vibration energy transmission path of this device is: pipeline vibration, valve body, valve seat, shock attenuation washer in proper order, makes shock attenuation washer take place elastic deformation, can effectively reduce amplitude 70% 80% according to the actual measurement data, can reduce water hammer impact 90% 95%.

Description

Technical Field

[0001] This utility model relates to the field of valve manufacturing technology, and in particular to a valve casting with shock absorption function. Background Technology

[0002] Valves, as core components of fluid control systems, are widely used in petrochemical, power energy, and water supply and drainage industries. In industrial practice, over 65% of valves are installed in environments with mechanical vibration (such as pump station outlets, compressor pipelines, and turbine bypasses). According to the API 570 pipeline vibration standard, when the pipeline vibration velocity exceeds 4.5 mm / s, the risk of valve failure increases significantly, specifically manifested as follows: 1. Systemic failures caused by vibration Seal failure (accounting for 48% of failures) Vibration causes periodic micro-displacements of 5-200 μm between the valve disc and seat, resulting in fretting wear on the sealing surface. For example, in high-temperature steam valves, this wear can reduce the sealing leakage rate from GB / T13927 Class A to Class D within 3 months (test data source: SHELL Valve Reliability Report).

[0003] Loose fasteners (accounting for 31% of failures) When the vibration acceleration is ≥2g, the preload of the valve body bolts decreases by 15% per month (verified by ASME PCC-1 standard). Statistics from a certain oil refinery show that flange leakage caused by this accounts for 24% of the total number of accidents.

[0004] Structural fatigue Under alternating stress, cracks are prone to develop at the root of the valve stem (a typical failure case: the main feedwater valve of a nuclear power plant broke due to 20Hz resonance, resulting in a shutdown loss of $2.3 million).

[0005] 2. Limitations of traditional vibration reduction technology Currently, the industry mainly relies on two types of external vibration damping solutions: Pipeline support system For example, spring hangers and hydraulic dampers have significant defects: The installation requires a large space, with a radial space of ≥300mm. It can only suppress the overall vibration of the pipeline, but cannot block the local vibration energy transmitted to the inside of the valve.

[0006] Valve body reinforcement structure By increasing the wall thickness or adding reinforcing ribs (such as the Class 2500 high-pressure valve of ASME B16.34), actual measurements show that the vibration transmission rate is reduced by only 18%-32% (MSS SP-58 test report), and a weight penalty of 20%-35% is imposed. Utility Model Content

[0007] In order to overcome the shortcomings of the existing technology, this utility model provides a valve casting with shock absorption function. The vibration energy transmission path of this device is as follows: pipeline vibration, valve body, valve seat, shock absorption washer, which causes the shock absorption washer to undergo elastic deformation. According to actual measurement data, it can effectively reduce the amplitude by 70%-80% and reduce water hammer impact by 90%-95%.

[0008] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a valve casting with shock absorption function, including a valve body and a valve cover formed by casting, wherein a valve seat and a valve disc that cooperates with the valve seat and a valve stem for driving the valve disc are provided in the inner cavity of the valve body, and a built-in shock absorption unit is provided on the casting body corresponding to the mounting surface of the valve seat, the support structure / guide structure of the valve disc or the protruding part of the valve stem.

[0009] Furthermore, the built-in shock absorption unit includes an annular shock absorption washer, which is disposed between the outer periphery of the valve seat and the bottom surface of the valve body and the mounting groove, and is pressed and fixed by fasteners.

[0010] Furthermore, the built-in shock absorption unit includes a shock absorption bushing, which is fixed to the inner wall of the guide groove of the valve body. The valve disc is provided with a guide portion, which is slidably mounted on the shock absorption bushing.

[0011] Furthermore, the built-in shock absorption unit includes a shock absorption bearing bushing, which is disposed in the bearing holes of the valve body, the supporting valve disc, and the rotating shaft.

[0012] Furthermore, the built-in shock absorption unit includes a shock absorption bushing, which is fixed to the valve stem protrusion hole of the valve cover and covers the valve stem.

[0013] Furthermore, the built-in shock absorption unit is fixed by any of the following methods: pre-embedded casting, adhesive bonding, interference fit, or mechanical locking.

[0014] Furthermore, a metal limiting structure is provided around the built-in shock absorption unit.

[0015] Furthermore, the damping bushing extends to the bottom of the filler area.

[0016] Furthermore, both the inlet and outlet ends of the valve body are provided with buffer structures. The buffer structure is a bucket-shaped structure with two small-diameter ends installed opposite each other, and its large-diameter end is fixedly installed on the inner wall of the valve body. A distance is left between the two bucket-shaped structures to form a buffer cavity between the two bucket-shaped structures.

[0017] Furthermore, a partition is provided inside the buffer cavity of the buffer structure. The partition is fixedly installed on the inner wall of the valve body, and multiple through holes are arranged in a circular array near the valve body.

[0018] Compared with the prior art, the beneficial effects that this utility model can achieve are: The vibration energy transmission path of this device is as follows: pipeline vibration, valve body, valve seat, and damping washer, causing the damping washer to undergo elastic deformation. According to actual measurement data, it can effectively reduce the amplitude by 70%-80% and reduce water hammer impact by 90%-95%. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a valve casting with shock absorption function according to the present invention; Figure 2 This is a three-dimensional structural diagram of the partition plate of a valve casting with shock absorption function according to the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the partition plate of a valve casting with shock absorption function according to the present invention.

[0020] The components include: valve body 1; valve cover 2; valve seat 3; valve disc 4; valve stem 5; annular shock absorber 6; shock absorber bushing 7; shock absorber bushing 8; buffer structure 9; and partition 10. Detailed Implementation

[0021] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this utility model. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0022] Example: Combination Figure 1As shown, this utility model provides a valve casting with shock absorption function, including a valve body 1 and a valve cover 2 formed by casting. The valve body 1 has a valve seat 3 and a valve disc 4 that cooperates with the valve seat 3, and a valve stem 5 for driving and connecting the valve disc 4. The valve body 1 is made of ASTM A216 Gr.WCB cast steel with a DN50PN40 standard flange interface. The valve cover 2 is connected to the valve body 1 through a flange and is made of the same material as the valve body 1. The valve seat 3 is made of PTFE sealing ring and is interference-fitted into the sealing groove of the valve body 1. The valve disc 4 is a full-bore stainless steel ball with a diameter of φ58mm and surface sprayed with Stellite 6 alloy. The valve stem 5 is made of 1Cr13 stainless steel. The upper end of the valve stem 5 is connected to an electric actuator, and the lower end is connected to a square hole provided on the ball 4. An integrated shock absorption unit is integrally provided on the mounting surface of the valve seat 3, the support structure / guide structure of the valve disc 4, or the protruding part of the valve stem 5 on the corresponding casting body. The built-in damping unit is made of elastic non-metallic material and is embedded in the reserved structure of the casting by pre-embedding, embedding or fixing. The elastic non-metallic material is selected from one or a combination of the following: nitrile rubber, fluororubber, EPDM rubber; high temperature resistant polyurethane; polyetheretherketone, polyimide; flexible graphite composite elastomer. The built-in damping unit is used to absorb the vibration energy transmitted to the valve seat 3, valve disc 4 or valve stem 5.

[0023] The built-in shock absorption unit includes an annular shock absorption washer 6, which is made of annular fluororubber. The annular shock absorption washer 6 is set between the outer periphery of the valve seat 3 and the bottom surface of the valve body 1 and the mounting groove, and is fixed by fasteners. It can compensate for the difference in thermal expansion, and the measured contact stress fluctuation of the sealing surface is reduced by 70%.

[0024] The built-in shock absorption unit includes a shock absorption bushing 7, which is fixed to the inner wall of the guide groove of the valve body 1. The valve disc 4 is provided with a guide part, which is slidably mounted on the shock absorption bushing 7.

[0025] The built-in shock absorption unit includes a shock absorption bearing bushing, which is disposed in the bearing hole of the valve body 1 and the supporting valve disc 4.

[0026] The built-in shock absorption unit includes a shock absorption bushing 8, which extends to the bottom of the packing area. The material is flexible graphite + FKM composite sheet. The shock absorption bushing 8 is fixed to the valve stem through hole of the valve cover 2 and covers the valve stem 5, which can reduce the radial sway of the valve stem 5.

[0027] The built-in damping unit is fixed by any of the following methods: pre-embedded casting, adhesive bonding, interference fit, or mechanical locking.

[0028] The built-in shock absorber unit is surrounded by a metal limiting structure to secure it.

[0029] Both the inlet and outlet ends of the valve body 1 are equipped with a buffer structure 9. The buffer structure 9 is a funnel-shaped structure with two small-diameter ends installed opposite each other, and its large-diameter end is fixedly installed on the inner wall of the valve body 1. There is a distance between the two funnel-shaped structures, forming a buffer cavity between the two funnel-shaped structures. The liquid flows through the buffer structure 9, and by changing the liquid flow area and path, the liquid flow is prevented from directly impacting the valve disc 4.

[0030] The buffer structure 9 has a buffer chamber equipped with a baffle 10, which is fixedly installed on the inner wall of the valve body 1. The baffle 10 has multiple through holes arranged in a circular array near the valve body 1. The baffle 10 has a buffer chamber facing the funnel-shaped structure, and the buffer chamber can be an airbag structure. 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 valve casting with shock absorption function, comprising a valve body (1) and a valve cover (2) formed by casting, wherein the valve body (1) has a valve seat (3) and a valve disc (4) cooperating with the valve seat (3) and a valve stem (5) for driving the valve disc (4), characterized in that: Built-in shock absorption units are provided on the casting body corresponding to the mounting surface of the valve seat (3), the support structure / guide structure of the valve disc (4), or the protruding part of the valve stem (5).

2. A valve casting with shock absorption function according to claim 1, characterized in that: The built-in shock absorption unit includes an annular shock absorption washer (6), which is disposed between the outer periphery of the valve seat (3) and the bottom surface of the valve body (1) and the mounting groove, and is pressed and fixed by fasteners.

3. A valve casting with shock absorption function according to claim 1, characterized in that: The built-in shock absorption unit includes a shock absorption bushing (7), which is fixed to the inner wall of the guide groove of the valve body (1). The valve disc (4) is provided with a guide part, which is slidably mounted on the shock absorption bushing (7).

4. A valve casting with shock absorption function according to claim 1, characterized in that: The built-in shock absorption unit includes a shock absorption bearing bushing, which is disposed in the bearing hole of the valve body (1) and the supporting valve disc (4).

5. A valve casting with shock absorption function according to claim 1, characterized in that: The built-in shock absorption unit includes a shock absorption bushing (8), which is fixed to the valve stem protrusion hole of the valve cover (2) and covers the valve stem (5).

6. A valve casting with shock absorption function according to any one of claims 1-5, characterized in that: The built-in shock absorption unit is fixed by any of the following methods: pre-embedded casting, adhesive bonding, interference fit, or mechanical locking.

7. A valve casting with shock absorption function according to any one of claims 1-5, characterized in that: The built-in shock absorption unit is surrounded by a metal limiting structure.

8. A valve casting with shock absorption function according to claim 5, characterized in that: The damping bushing (8) extends to the bottom of the filler area.

9. A valve casting with shock absorption function according to claim 1, characterized in that: Both the inlet and outlet ends of the valve body (1) are provided with buffer structures (9). The buffer structure (9) is a bucket-shaped structure with two small-diameter ends installed opposite each other. Its large-diameter end is fixedly installed on the inner wall of the valve body (1). There is a distance between the two bucket-shaped structures, forming a buffer cavity between the two bucket-shaped structures.

10. A valve casting with shock absorption function according to claim 9, characterized in that: The buffer structure (9) has a baffle (10) inside its buffer cavity. The baffle (10) is fixedly installed on the inner wall of the valve body (1). The baffle (10) has multiple through holes arranged in a circular array near the valve body (1).

Images