Pilot operated safety valve and method of adjusting the action

Abstract

The present application relates to the technical fields of pilot operated safety valve, and discloses a pilot operated safety valve and a method for adjusting the action performance. The pilot operated safety valve comprises a main valve, a pilot valve and an adjusting device. The adjusting device comprises an adjusting member and an adjusting body. The adjusting member is provided with an adjusting hole, a first hole and a second hole, and the first hole and the second hole are communicated with the adjusting hole. The adjusting body is provided with an assembling hole, a first flow channel and a second flow channel. The adjusting member is rotationally fitted in the assembling hole. The first flow channel is communicated with the adjusting hole. The opening of the second flow channel is matched with the outer periphery of the adjusting member. The first hole and the second hole are both located in the axial projection range of the second flow channel. At least one of the first hole and the second hole is communicated with the second flow channel during the rotation of the adjusting member. In the pilot operated safety valve, the flow area between the first flow channel and the second flow channel can be changed by rotating the adjusting member, thereby changing the pressure building and pressure releasing speed of the gas chamber, and finally achieving the effect of adjusting the action performance of the pilot operated safety valve.

Description

Technical Field

[0001] This invention relates to the field of pilot-operated safety valve technology, specifically to a pilot-operated safety valve and a method for adjusting the operating performance of the pilot-operated safety valve based on the above-mentioned pilot-operated safety valve. Background Technology

[0002] A safety valve is a reclosable overpressure protection device that can use the pressure of the medium itself to discharge a rated flow of fluid, thereby relieving some of the pressure in pressure vessels, pressure pipelines, boilers, and other pressure-bearing devices and equipment, preventing damage to the system or equipment due to overpressure, and ensuring the normal operation of the device and equipment as well as the safety of the operators.

[0003] A pilot-operated safety valve is a type of safety valve consisting of a main valve and a pilot valve. The pilot valve controls the operation of the main valve and has advantages such as high set pressure, large discharge capacity, reliable sealing, and insensitivity to back pressure. With economic development and the improvement of industrial levels, the required discharge capacity of safety valves is increasing, and the set pressure is also increasing, leading to the increasingly widespread application of pilot-operated safety valves.

[0004] The operating performance of a pilot-operated safety valve is generally reflected in two aspects: performance parameters and deviations, such as set pressure and deviation, sealing performance, opening height under excess pressure, excess pressure, and opening / closing pressure difference; and mechanical operating characteristics, such as the presence of frequency jumping, chattering, and jamming, and whether the repeatability is good. Steam media conditions place high demands on the operating performance of pilot-operated safety valves. Pilot-operated safety valves in related technologies do not have the function of regulating operating performance and cannot meet the needs of steam media conditions. Summary of the Invention

[0005] This invention is based on the inventor's discovery and understanding of the following facts and problems: Based on the principle of pilot-operated safety valves, it can be deduced that the pressure build-up and depressurization speed of the air chamber can affect the opening and closing time of the main valve, and thus affect the operating performance of the pilot-operated safety valve. Therefore, the pressure build-up and depressurization speed of the air chamber can be adjusted by adjusting the adjusting device, thereby adjusting the operating performance of the pilot-operated safety valve.

[0006] The present invention aims to at least partially solve one of the technical problems in the related art.

[0007] Therefore, this invention provides a pilot-operated safety valve that can regulate the pressure build-up and depressurization speed of the gas chamber, thereby regulating the operating performance of the pilot-operated safety valve.

[0008] This invention also proposes a method for adjusting motion performance.

[0009] The pilot-operated safety valve of this invention includes: a main valve, a pilot valve, and a regulating device. The main valve includes a main valve body and a piston. The main valve body is provided with an air chamber and a main valve chamber. The main valve chamber has a main valve inlet and a main valve outlet. The piston is located in the main valve chamber and can move under the pressure of the air chamber and the pressure of the main valve inlet to realize the opening and closing of the main valve inlet and the main valve outlet.

[0010] The pilot valve includes a pilot valve body and a pilot valve core. The pilot valve body is provided with a pilot valve inlet and a pilot valve outlet. The pilot valve inlet is connected to the main valve inlet, and the pilot valve outlet is connected to the air chamber. The pilot valve core is fitted inside the pilot valve body and is used to realize the opening and closing of the pilot valve inlet and the pilot valve outlet.

[0011] The adjusting device includes an adjusting component and an adjusting body. The adjusting component has an adjusting hole, a first hole, and a second hole. The adjusting hole is located at the end of the adjusting component. The first hole and the second hole are located on the outer periphery of the adjusting component and communicate with the adjusting hole. The axes of the first hole and the second hole are arranged at an angle to each other.

[0012] The regulating body is provided with an assembly hole, a first flow channel, and a second flow channel. One of the first flow channel and the second flow channel communicates with the air chamber, and the other communicates with the outlet of the pilot valve.

[0013] The adjusting component is rotatably fitted into the mounting hole. The first flow channel communicates with the adjusting hole, and the opening of the second flow channel is fitted with the outer periphery of the adjusting component. Both the first hole and the second hole are located within the axial projection range of the second flow channel. During the rotation of the adjusting component, at least one of the first hole and the second hole communicates with the second flow channel to adjust the flow area between the first flow channel and the second flow channel.

[0014] In the pilot-operated safety valve of this invention, the regulating body is provided with a first flow channel and a second flow channel, which are respectively connected to the gas chamber and the pilot valve outlet. The regulating component is provided with an regulating hole, a first hole, and a second hole. When the regulating component is fitted into the mounting hole of the regulating body, the regulating hole is connected to the first flow channel, and the first hole and the second hole are located within the axial projection range of the second flow channel.

[0015] During the rotation of the adjusting component within the assembly hole, when only the first hole is aligned and connected to the second flow channel, the flow area between the first and second flow channels depends on the flow area within the first hole; when only the second hole is aligned and connected to the second flow channel, the flow area between the first and second flow channels depends on the flow area within the first hole. When the first hole is partially connected to the second flow channel, or the second hole is partially connected to the second flow channel, or both the first and second holes are partially aligned with the second flow channel, the flow area between the first and second flow channels is the sum of the areas of the first hole, the second hole, and the second flow channel that overlap.

[0016] When the flow area between the first and second flow channels is large, the pressure build-up and depressurization rates of the gas chamber are large, and the valve opening and closing speeds are fast; when the flow area between the first and second flow channels is small, the pressure build-up and depressurization rates of the gas chamber are small, and the valve opening and closing speeds are slow.

[0017] In summary, by rotating the adjusting component, the flow area between the first and second flow channels can be changed, thereby altering the pressure build-up and depressurization rates of the air chamber, ultimately achieving the effect of regulating the operating performance of the pilot-operated safety valve.

[0018] In some embodiments, the first flow channel is connected to the air chamber cavity, and the second flow channel is connected to the outlet of the pilot valve. The relationship between the flow area S1 of the first flow channel, the flow area S2 of the second flow channel, the flow area S3 inside the first hole, and the flow area S4 inside the second hole is: S2≥S1>S3>S4.

[0019] In some embodiments, both the first hole and the second hole penetrate the adjusting member and communicate with the adjusting hole.

[0020] In some embodiments, the axis of the first hole is perpendicular to the axis of the second hole.

[0021] In some embodiments, the adjusting member is provided with a tooling hole, which can engage with a tooling anti-rotation device and be used to rotate the adjusting member to adjust the flow area between the first flow channel and the second flow channel.

[0022] In some embodiments, the adjusting device includes a fixing component, which includes an end cap and a fastener. The end cap engages with the mounting hole and abuts against the adjusting member, and the fastener securely connects the end cap to the adjusting body.

[0023] In some embodiments, the adjusting device includes a seal disposed between the adjusting body and the end cap.

[0024] In some embodiments, the assembly hole is provided with a first step and a second step, the first step and the second step are arranged at intervals, and the inner diameter of the first step is larger than the inner diameter of the second step.

[0025] In some embodiments, the main valve includes a main valve cover, which constitutes the regulating body. The regulating member is fitted to the main valve cover, and the main valve cover is disposed on the main valve body. The first flow channel communicates with the gas chamber cavity, and the second flow channel communicates with the pilot valve outlet.

[0026] The action performance adjustment method of this invention is based on the pilot-operated safety valve of the above embodiment, and includes the following steps: using tools to remove the fasteners and then removing the end cap; inserting the tool into the tool hole and rotating the adjusting component to adjust the flow area between the first flow channel and the second flow channel; after adjustment, reinstalling the end cap and fasteners. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the pilot-operated safety valve according to an embodiment of the present invention.

[0028] Figure 2 This is a front view of the regulating component of the pilot-operated safety valve according to an embodiment of the present invention.

[0029] Figure 3 This is a cross-sectional view of the regulating component of the pilot-operated safety valve according to an embodiment of the present invention.

[0030] Figure 4 This is an assembly diagram of the regulating component and regulating body of the pilot-operated safety valve according to an embodiment of the present invention.

[0031] Figure 5 This is an assembly diagram of the regulating device of the pilot-operated safety valve according to an embodiment of the present invention.

[0032] Figure label:

[0033] 1. Main valve; 11. Main valve body; 111. Air chamber; 112. Main valve inlet; 113. Main valve outlet; 12. Piston; 13. Main valve cover; 2. Pilot valve; 21. Pilot valve body; 211. Pilot valve inlet; 212. Pilot valve outlet; 213. Discharge port; 22. Pilot valve core; 23. Spring; 3. Adjusting device; 31. Adjusting component; 311. Adjusting hole; 312. First hole; 313. Second hole; 314. Tooling hole; 32. Adjusting body; 321. Assembly hole; 322. First flow channel; 323. Second flow channel; 324. First step; 325. Second step; 33. Fixing component; 331. End cap; 332. Fastener. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] like Figures 1-5 As shown, the pilot-operated safety valve of this embodiment includes: a main valve 1, a pilot valve 2, and a regulating device 3.

[0036] The main valve 1 includes a main valve body 11 and a piston 12. The main valve body 11 is provided with an air chamber 111 and a main valve chamber. The main valve chamber has a main valve inlet 112 and a main valve outlet 113. The piston 12 is located in the main valve chamber and can move under the pressure of the air chamber 111 and the pressure of the main valve inlet 112 to realize the opening and closing of the main valve inlet 112 and the main valve outlet 113.

[0037] like Figure 1 As shown, piston 12 is located in the main valve chamber and can move up and down. When piston 12 is located in... Figure 1 In the position shown, the main valve inlet 112 and the main valve outlet 113 are isolated. When the piston 12 moves upward, the main valve inlet 112 and the main valve outlet 113 can communicate. The gas chamber 111 is located above the piston 12, and the medium in the gas chamber 111 exerts a downward force on the piston 12. The main valve inlet 112 is located below the piston 12, and the medium at the main valve inlet 112 exerts an upward force on the piston 12. Furthermore, the area of ​​the medium in the gas chamber 111 exerting a force on the piston 12 is larger than the area of ​​the medium at the main valve inlet 112 exerting a force on the piston 12.

[0038] Pilot valve 2 includes a pilot valve body 21 and a pilot valve core 22. The pilot valve body 21 is provided with a pilot valve inlet 211 and a pilot valve outlet 212. The pilot valve inlet 211 is connected to the main valve inlet 112, and the pilot valve outlet 212 is connected to the gas chamber 111. The pilot valve core 22 is fitted inside the pilot valve body 21 and is used to realize the opening and closing of the pilot valve inlet 211 and the pilot valve outlet 212. Pilot valve 2 also includes a discharge port 213, which can be connected to the gas chamber 111 and is used to discharge the medium in the gas chamber 111.

[0039] The pilot valve core 22 is located inside the pilot valve body 21 and can slide up and down. When the pilot valve core 22 is in Figure 1 In the position shown, the pilot valve inlet 211 and pilot valve outlet 212 are connected, and the discharge port 213 is closed. When the pilot valve core 22 moves upward, the pilot valve inlet 211 and pilot valve outlet 212 are disconnected, and the discharge port 213 opens. A spring 23 may be installed inside the pilot valve body 21, and the pilot valve core 22 is simultaneously subjected to a downward force from the spring 23 and an upward force from the medium at the pilot valve inlet 211.

[0040] like Figure 1As shown, when the pressure of the medium at the main valve inlet 112 is at the normal value, the force on the pilot valve core 22 is downward. The main valve inlet 112, the pilot valve inlet 211, the pilot valve outlet 212 and the air chamber 111 are connected. Since the area of ​​the medium in the air chamber 111 acting on the piston 12 is greater than the area of ​​the medium at the main valve inlet 112 acting on the piston 12, the force on the piston 12 is downward, and the main valve 1 remains closed.

[0041] When the pressure of the medium at the main valve inlet 112 rises to the set pressure, the pilot valve core 22 is subjected to an upward force, isolating the pilot valve inlet 211 from the pilot valve outlet 212, and opening the discharge port 213. The medium at the main valve inlet 112 pushes the piston 12 upward, and the medium in the gas chamber 111 is discharged through the discharge port 213. The piston 12 gradually slides upward, the main valve 1 gradually opens, the medium is discharged from the main valve outlet 113, and the medium pressure at the main valve inlet 112 gradually decreases.

[0042] When the medium pressure at the main valve inlet 112 decreases to the reseating pressure, the pilot valve 2 is forced downward, connecting the main valve inlet 112, the pilot valve inlet 211, the pilot valve outlet 212, and the gas chamber 111, while the discharge port 213 closes. The medium at the main valve inlet 112 gradually flows into the gas chamber 111, the piston 12 slides downward, and the main valve 1 closes.

[0043] like Figures 2-5 As shown, the adjusting device 3 includes an adjusting member 31 and an adjusting body 32. The adjusting member 31 is provided with an adjusting hole 311, a first hole 312, and a second hole 313. The adjusting hole 311 is located at the end of the adjusting member 31. The first hole 312 and the second hole 313 are located on the outer periphery of the adjusting member 31 and communicate with the adjusting hole 311. The axes of the first hole 312 and the second hole 313 are arranged at an angle. Specifically, the adjusting hole 311 is arranged along the axial direction of the adjusting member 31, and the first hole 312 and the second hole 313 are arranged perpendicular to the axial direction of the adjusting member 31. The axes of the first hole 312 and the second hole 313 are perpendicular to each other and are arranged vertically at intervals on the adjusting member 31.

[0044] The regulating body 32 is provided with an assembly hole 321, a first flow channel 322, and a second flow channel 323. One of the first flow channel 322 and the second flow channel 323 communicates with the air chamber 111, and the other communicates with the pilot valve outlet 212. The regulating member 31 is rotatably fitted in the assembly hole 321. The first flow channel 322 communicates with the regulating hole 311, and the opening of the second flow channel 323 is fitted with the outer periphery of the regulating member 31. Both the first hole 312 and the second hole 313 are located within the axial projection range of the second flow channel 323. During the rotation of the regulating member 31, at least one of the first hole 312 and the second hole 313 communicates with the second flow channel 323 to adjust the flow area between the first flow channel 322 and the second flow channel 323.

[0045] Specifically, the axes of the first flow channel 322 and the second flow channel 323 can be arranged perpendicularly. When the adjusting member 31 is fitted into the assembly hole 321, the opening of the first flow channel 322 is aligned with the opening of the adjusting hole 311, and the opening of the second flow channel 323 is fitted into the outer periphery of the adjusting member 31.

[0046] During the rotation of the adjusting component 31 within the assembly hole 321, when only the first hole 312 is aligned and connected to the second flow channel 323, the flow area between the first flow channel 322 and the second flow channel 323 is the flow area within the first hole 312. When only the second hole 313 is aligned and connected to the second flow channel 323, the flow area between the first flow channel 322 and the second flow channel 323 is taken as the flow area within the first hole 312.

[0047] When the first hole 312 is partially connected to the second flow channel 323, or the second hole 313 is partially connected to the second flow channel 323, or both the first hole 312 and the second hole 313 are partially connected to the second flow channel 323, the flow area between the first flow channel 322 and the second flow channel 323 is the sum of the areas of the first hole 312 and the second hole 313 connected to the second channel.

[0048] When the flow area between the first flow channel 322 and the second flow channel 323 is large, the pressure build-up and depressurization rates of the air chamber 111 are large, and the valve opens and closes quickly. When the flow area between the first flow channel 322 and the second flow channel 323 is small, the pressure build-up and depressurization rates of the air chamber 111 are small, and the valve opens and closes slowly. Therefore, by rotating the adjusting component 31, the flow area between the first flow channel 322 and the second flow channel 323 can be changed, thereby changing the pressure build-up and depressurization rates of the air chamber 111, ultimately achieving the effect of adjusting the operating performance of the pilot-operated safety valve.

[0049] In some embodiments, the first flow channel 322 is connected to the air chamber 111, and the second flow channel 323 is connected to the valve outlet 212. The relationship between the flow area S1 of the first flow channel 322, the flow area S2 of the second flow channel 323, the flow area S3 inside the first hole 312, and the flow area S4 inside the second hole 313 is: S2≥S1>S3>S4.

[0050] In some embodiments, such as Figures 2-5 As shown, the first flow channel 322 is connected to the air chamber 111, and the second flow channel 323 is connected to the guide valve outlet 212. The relationship between the flow area S1 of the first flow channel 322, the flow area S2 of the second flow channel 323, the flow area S3 inside the first hole 312, and the flow area S4 inside the second hole 313 is: S2≥S1>S3>S4.

[0051] It is understandable that the flow area inside the first hole 312 and the second hole 313 is smaller than the flow area of ​​the first flow channel 322 and the second flow channel 323. This arrangement allows the first hole 312 and the second hole 313 to control the flow area between the first flow channel 322 and the second flow channel 323.

[0052] The flow area S3 of the first orifice 312 is greater than the flow area S4 of the second orifice 313. When the adjusting member 31 is rotated until the opening of the first orifice 312 is aligned with the opening of the second flow channel 323, the flow area between the first flow channel 322 and the second flow channel 323 is at its maximum, which is S3. At this time, the pressure build-up and pressure relief speed of the air chamber 111 is the fastest, and correspondingly, the pressure difference generated on both sides of the piston 12 is the fastest, and the valve has the fastest opening or closing speed.

[0053] When the adjusting member 31 is rotated until the opening of the second hole 313 is aligned with the opening of the second flow channel 323, the flow area between the first flow channel 322 and the second flow channel 323 is minimized to S3. At this time, the pressure build-up and depressurization speed of the air chamber 111 is the slowest, and correspondingly, the speed at which the pressure difference is generated on both sides of the piston 12 is the slowest, and the valve has the slowest opening or closing speed.

[0054] When the adjusting member 31 is rotated to other positions, part of the first hole 312 aligns with the second flow channel 323, or part of the first hole 312 aligns with the first flow channel 322, or both the first hole 312 and the second hole 313 are partially aligned with the second flow channel 323. At this time, the flow area between the first flow channel 322 and the second flow channel 323 is between S3 and S2, and correspondingly, the valve opening or closing speed is between the slowest speed and the fastest speed.

[0055] In some embodiments, such as Figures 2-5 As shown, both the first hole 312 and the second hole 313 penetrate the adjusting member 31 and communicate with the adjusting hole 311. This arrangement ensures that the two openings of the first hole 312 and the two openings of the second hole 313 are spaced apart on the outer periphery of the adjusting member 31. When the adjusting member 31 is rotated, the flow area between the first flow channel 322 and the second flow channel 323 changes relatively continuously, facilitating continuous adjustment of the pilot-operated safety valve's operating performance.

[0056] In other embodiments, the first and second holes only communicate with the adjustment hole and do not penetrate the adjustment member. In this case, when the adjustment member is rotated, the flow area between the first and second channels will be zero, requiring continued rotation of the adjustment member to adjust the operating performance of the pilot-operated safety valve.

[0057] In some embodiments, such as Figures 2-5As shown, the axis of the first hole 312 is perpendicular to the axis of the second hole 313. This arrangement ensures a more continuous change in the flow area between the first flow channel 322 and the second flow channel 323 when the adjusting member 31 is rotated, facilitating continuous adjustment of the pilot-operated safety valve's operating performance.

[0058] In other embodiments, the angle between the axis of the first hole and the axis of the second hole can also be an acute angle.

[0059] In some embodiments, such as Figures 2-5 As shown, the adjusting member 31 is provided with a tooling hole 314. The tooling hole 314 can engage with a tooling anti-rotation device and is used to rotate the adjusting member 31 to adjust the flow area between the first flow channel 322 and the second flow channel 323. Specifically, the tooling hole 314 is located at the tail of the adjusting member 31. The operator can rotate the adjusting member 31 by using a tooling device that matches the shape of the tooling hole 314 to adjust the operating performance of the pilot-operated safety valve.

[0060] In some embodiments, such as Figures 2-5 As shown, the regulating device 3 includes a fixing component 33, which includes an end cap 331 and a fastener 332. The end cap 331 fits into the mounting hole 321 and abuts against the regulating member 31. The fastener 332 fixes the end cap 331 to the regulating body 32. Specifically, the fastener 332 can be a bolt. The fixing component 33 can fix the relative position between the regulating member 31 and the regulating body 32, preventing the regulating member 31 from rotating relative to the regulating body 32 and causing changes in the operating performance of the pilot-operated safety valve. In addition, the fixing component 33 can also seal the regulating body 32 to prevent media leakage.

[0061] In some embodiments, such as Figures 2-5 As shown, the regulating device 3 includes a sealing element disposed between the regulating body 32 and the end cap 331. The sealing element enhances the sealing effect between the regulating element 31 and the regulating body 32, preventing leakage of the medium from the regulating device 3.

[0062] In some embodiments, such as Figures 2-5 As shown, a first step 324 and a second step 325 are provided within the assembly hole 321. The first step 324 and the second step 325 are arranged at intervals, and the inner diameter of the first step 324 is larger than the inner diameter of the second step 325. Specifically, both the first step 324 and the second step 325 are annular steps, and the outer circumferential shape of the adjusting member 31 is adapted to the first step 324 and the second step 325. The first step 324 and the second step 325 can provide circumferential positioning for the adjusting member 31, facilitating assembly.

[0063] In some embodiments, such as Figures 1-5As shown, the main valve 1 includes a main valve cover 13, which forms an adjusting body 32. An adjusting element 31 is fitted to the main valve cover 13. The main valve cover 13 is disposed on the main valve body 11. The first flow channel 322 is connected to the air chamber 111, and the second flow channel 323 is connected to the pilot valve outlet 212.

[0064] Specifically, the main valve cover 13 is mounted on the upper part of the main valve body 11, and the space between the main valve cover 13 and the main valve body 11 is a gas chamber 111. The main valve cover 13 is provided with an assembly hole 321, a first flow channel 322, and a second flow channel 323. The adjusting member 31 fits into the assembly hole 321. The first flow channel 322 communicates with the gas chamber 111, and the second flow channel 323 communicates with the pilot valve outlet 212. By rotating the adjusting member 31, the flow area between the first flow channel 322 and the second flow channel 323 can be adjusted, thereby adjusting the operating performance of the pilot-operated safety valve.

[0065] The following describes the motion performance adjustment method according to an embodiment of the present invention.

[0066] The action performance adjustment method of this invention is based on the pilot-operated safety valve in the above embodiment, and includes the following steps: using a tool to remove the fastener 332, and then removing the end cover 331; inserting the tool into the tool hole 314 and rotating the adjusting member 31 to adjust the flow area between the first flow channel 322 and the second flow channel 323; after adjustment, reinstalling the end cover 331 and the fastener 332.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0072] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pilot-operated safety valve, characterized in that, include: The main valve includes a main valve body and a piston. The main valve body is provided with an air chamber and a main valve chamber. The main valve chamber has a main valve inlet and a main valve outlet. The piston is located in the main valve chamber and can move under the pressure of the air chamber and the pressure of the main valve inlet to realize the opening and closing of the main valve inlet and the main valve outlet. A pilot valve, comprising a pilot valve body and a pilot valve core, wherein the pilot valve body is provided with a pilot valve inlet and a pilot valve outlet, the pilot valve inlet is connected to the main valve inlet, and the pilot valve outlet is connected to the air chamber, and the pilot valve core is fitted inside the pilot valve body and is used to realize the opening and closing of the pilot valve inlet and the pilot valve outlet; An adjusting device includes an adjusting member and an adjusting body. The adjusting member has an adjusting hole, a first hole, and a second hole. The adjusting hole is located at the end of the adjusting member. The first hole and the second hole are located on the outer periphery of the adjusting member and communicate with the adjusting hole. The axes of the first hole and the second hole are arranged at an angle to each other. The regulating body is provided with an assembly hole, a first flow channel, and a second flow channel. One of the first flow channel and the second flow channel communicates with the air chamber, and the other communicates with the outlet of the pilot valve. The adjusting component is rotatably fitted into the mounting hole. The first flow channel communicates with the adjusting hole, and the opening of the second flow channel is fitted with the outer periphery of the adjusting component. Both the first hole and the second hole are located within the axial projection range of the second flow channel. During the rotation of the adjusting component, at least one of the first hole and the second hole communicates with the second flow channel to adjust the flow area between the first flow channel and the second flow channel.

2. The pilot-operated safety valve according to claim 1, characterized in that, The first flow channel is connected to the air chamber cavity, and the second flow channel is connected to the outlet of the pilot valve. The relationship between the flow area S1 of the first flow channel, the flow area S2 of the second flow channel, the flow area S3 inside the first hole, and the flow area S4 inside the second hole is: S2≥S1>S3>S4.

3. The pilot-operated safety valve according to claim 1, characterized in that, Both the first hole and the second hole penetrate the adjusting member and are connected to the adjusting hole.

4. The pilot-operated safety valve according to claim 1, characterized in that, The axis of the first hole is perpendicular to the axis of the second hole.

5. The pilot-operated safety valve according to claim 1, characterized in that, The adjusting component is provided with a tooling hole, which can engage with a tooling anti-rotation device and be used to rotate the adjusting component to adjust the flow area between the first flow channel and the second flow channel.

6. The pilot-operated safety valve according to claim 5, characterized in that, The adjusting device includes a fixing component, which includes an end cap and a fastener. The end cap fits into the mounting hole and abuts against the adjusting member, and the fastener fixes the end cap to the adjusting body.

7. The pilot-operated safety valve according to claim 6, characterized in that, The adjusting device includes a sealing element disposed between the adjusting body and the end cap.

8. The pilot-operated safety valve according to claim 1, characterized in that, The assembly hole is provided with a first step and a second step, the first step and the second step are arranged at intervals, and the inner diameter of the first step is larger than the inner diameter of the second step.

9. The pilot-operated safety valve according to any one of claims 1-8, characterized in that, The main valve includes a main valve cover, which constitutes the regulating body. The regulating element is fitted to the main valve cover. The main valve cover is disposed on the main valve body. The first flow channel is connected to the air chamber cavity, and the second flow channel is connected to the pilot valve outlet.

10. A method for adjusting the operating performance of a pilot-operated safety valve based on claim 6 or 7, characterized in that, Includes the following steps: Use tools to remove the fasteners, and then remove the end cap; Insert the tooling into the tooling hole and rotate the adjusting component to adjust the flow area between the first flow channel and the second flow channel; After adjustment, reinstall the end caps and fasteners.

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