Pilot operated safety valve and fluid system

Abstract

The invention provides a pilot operated safety valve and a fluid system.The pilot operated safety valve comprises a main valve, a pilot valve and a connecting assembly, the connecting assembly comprises a connecting pipe and two connectors, the two connectors are located at the two ends of the connecting pipe respectively to connect the main valve with the pilot valve, and at least one of the two connectors is arranged to be a rotary connector; the rotary joint comprises a positioning assembly, a first rotating part and a second rotating part, wherein the first rotating part and the second rotating part are connected. The first rotating part can rotate relative to the second rotating part. The first rotating part is provided with a limiting gear ring, the second rotating part is provided with a rotating ring seat, the positioning assembly comprises a screw rod and a meshing gear block located at the end of the screw rod, the screw rod extends in the radial direction of the limiting gear ring, and the screw rod and the rotating ring seat are in threaded connection and can rotate so as to drive the meshing gear block to be meshed with or separated from the limiting gear ring. And the first rotating part and the second rotating part are fixed. The position between the main valve and the pilot valve can be flexibly adjusted, and the installation flexibility of the safety valve can be improved.

Description

Technical Field

[0001] This invention relates to the field of safety valve technology, and specifically to a pilot-operated safety valve and fluid system. Background Technology

[0002] In industrial production, especially in scenarios involving high-pressure, large-diameter fluid systems, pilot-operated safety valves sense system pressure through a pilot valve and drive or control the opening and closing of the main valve. They exhibit significant advantages in situations requiring high sealing performance and are widely used in important industries such as chemical, power, and oil and gas transportation.

[0003] In pilot-operated safety valve technology, the connection between the main valve and the pilot valve typically employs a fixed docking structure to ensure normal valve operation. However, in practical applications, some installation scenarios present challenges such as limited space and restricted installation locations. In these situations, the fixed docking structure, due to its fixed connection method and lack of adjustment flexibility, significantly increases the difficulty of installing the main valve and pilot valve. This can not only prolong the installation period but also potentially affect the sealing performance and pressure control accuracy of the safety valve due to improper installation, and even create potential safety hazards. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a pilot-operated safety valve and fluid system that allows for flexible adjustment of the positions between the main valve and the pilot valve, thus improving the installation flexibility of the safety valve.

[0005] The pilot-operated safety valve provided in this embodiment of the invention includes a main valve, a pilot valve, and a connecting assembly. The connecting assembly includes a connecting pipe and two connectors. The two connectors are located at both ends of the connecting pipe to connect the main valve and the pilot valve. At least one of the two connectors is a rotary connector. The rotary connector includes a positioning component and a first rotating part and a second rotating part connected to each other. The first rotating part is connected to the main valve or the pilot valve, and the second rotating part is connected to the connecting pipe. The first rotating part is rotatable relative to the second rotating part.

[0006] The first rotating part is provided with a limiting toothed ring, and the second rotating part is provided with a rotating ring seat. The rotating ring seat is sleeved on the outside of the limiting toothed ring. The positioning component includes a screw and a meshing tooth block located at the end of the screw. The screw extends radially along the limiting toothed ring and is threadedly connected to the rotating ring seat. The screw is rotatable relative to the rotating ring seat to drive the meshing tooth block to engage or disengage with the limiting toothed ring, thereby fixing the first rotating part and the second rotating part.

[0007] In summary, the pilot-operated safety valve provided by this invention can flexibly adjust the relative position between the main valve and the pilot valve through a rotary joint. This not only greatly improves the adaptability and flexibility of the safety valve in different installation environments and reduces the difficulties and time costs in the installation process, but also ensures the stability and reliability of the safety valve during operation.

[0008] In some embodiments, the meshing tooth block is provided with a sliding post, and the rotating ring seat is provided with a guide groove that cooperates with the sliding post, the guide groove extending along the radial direction of the limiting tooth ring.

[0009] In some embodiments, the joint between the connecting pipe and the main valve is a rotary joint, and the rotary joint further includes a fixing plate. The fixing plate is connected to the rotating ring seat. The pilot valve is provided with a mounting plate, which is connected to the fixing plate by a bolt structure, a snap-fit ​​structure, or welding, so that the pilot valve and the second rotating part rotate synchronously.

[0010] In some embodiments, the pilot-operated safety valve further includes two filters connected in parallel on the connecting pipe. Both the inlet and outlet of each filter are provided with regulating valves, which are used to regulate the fluid flow rate into and out of the filter.

[0011] In some embodiments, the filter includes a housing, a support, a filter plate, and a top cover, the top cover being detachably mounted on the housing to define a filter chamber, the support being disposed within the filter chamber, and the filter plate being disposed above the support to divide the filter chamber into upper and lower parts.

[0012] In some embodiments, the filter plate includes a first filter screen and a second filter screen, wherein the first filter screen is disposed close to the top cover relative to the second filter screen, and the mesh count of the first filter screen is greater than that of the second filter screen.

[0013] In some embodiments, the pilot-operated safety valve further includes a mounting bracket, one end of which is connected to the pilot valve, and the other end of which is provided with a slot for placing the filter, and the inner wall of the slot is provided with a shock-absorbing pad.

[0014] In some embodiments, the inner wall of the slot is provided with anti-slip texture, the shock-absorbing pad is made of silicone and has raised particles on its surface, and the raised particles abut against the outer wall of the box to achieve anti-slip positioning.

[0015] In some embodiments, the connecting pipe is configured as a soft pressure-applying pipe.

[0016] Furthermore, the fluid system provided by the present invention includes the pilot-operated safety valve described in any of the embodiments. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a pilot-operated safety valve provided in an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0019] Figure 3 yes Figure 1 A magnified view of a section at point B.

[0020] Figure 4 This is a schematic diagram showing the disassembled filter in a pilot-operated safety valve according to an embodiment of the present invention.

[0021] Figure 5 yes Figure 4 A magnified view of a section at point C.

[0022] Attached reference numeral: 100, pilot-operated safety valve;

[0023] 10. Main valve; 11. First port; 12. Second port

[0024] 20. Pilot valve; 21. Third port; 22. Fourth port; 23. Mounting plate;

[0025] 30. Connecting assembly; 31. Connecting pipe; 32. Rotary joint; 321. Fixing plate; 33. Fixed joint;

[0026] 41. Positioning assembly; 411. Screw; 412. Engaging tooth block; 413. Sliding column; 42. First rotating part; 421. Limiting tooth ring; 43. Second rotating part; 431. Rotating ring seat; 432. Guide groove;

[0027] 51. Filter; 511. Housing; 512. Support; 513. Top cover; 514. Filter chamber; 52. Regulating valve; 53. T-pipe; 531. First port; 532. Second port; 533. Third port; 54. Mounting bracket; 541. Slot; 542. Shock-absorbing pad. Detailed Implementation

[0028] 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.

[0029] like Figures 1 to 5As shown, one embodiment of the present invention provides a pilot-operated safety valve 100, which includes a main valve 10, a pilot valve 20, and a connecting assembly 30. The connecting assembly 30 includes a connecting pipe 31 and two connectors, which are located at opposite ends of the connecting pipe 31 to connect the main valve 10 and the pilot valve 20. At least one of the two connectors is a rotary connector 32, which includes a positioning assembly 41, a first rotating part 42 connected to the pilot valve 20, and a second rotating part 43 connected to the connecting pipe 31. The first rotating part 42 is rotatable relative to the second rotating part 43.

[0030] The first rotating part 42 is provided with a limiting toothed ring 421, and the second rotating part 43 is provided with a rotating ring seat 431. The rotating ring seat 431 is sleeved on the outside of the limiting toothed ring 421. The positioning component 41 includes a screw 411 and a meshing tooth block 412 located at the end of the screw 411. The screw 411 extends radially along the limiting toothed ring 421. The screw 411 is threadedly connected to the rotating ring seat 431. The screw 411 is rotatable relative to the rotating ring seat 431 to drive the meshing tooth block 412 to engage or disengage with the limiting toothed ring 421, thereby fixing the first rotating part 42 and the second rotating part 43.

[0031] Specifically, the main valve 10 and the pilot valve 20 can be connected via a connecting assembly 30 to achieve fluid passage communication. At least one of the two connectors at both ends of the connecting pipe 31 is a rotary connector 32, which facilitates adjustment of the positions of the pilot valve 20 and the connecting pipe 31, helping to adapt to the space requirements of different installation environments.

[0032] One end of the first rotating part 42 is provided with a standard interface (flange or thread) for connecting the main valve 10 or the pilot valve 20. The other end of the first rotating part 42 is provided with a limiting toothed ring 421, the outer surface of which is evenly distributed with triangular teeth. One end of the second rotating part 43 is connected to the connecting pipe 31, and the other end of the second rotating part 43 is provided with a rotating ring seat 431. The rotating ring seat 431 has an annular structure and is fitted onto the outside of the limiting toothed ring 421.

[0033] The positioning component 41 can connect the rotating ring seat 431 and the limiting gear ring 421. The rotating ring seat 431 is provided with a threaded hole, and the screw 411 can form a helical transmission pair with the threaded hole on the rotating ring seat 431. The tooth profile of the meshing tooth block 412 can mesh and match with the teeth on the limiting gear ring 421.

[0034] When it is necessary to adjust the relative position between the main valve 10 and the pilot valve 20, the operator can rotate the screw 411 to move it outward, causing the meshing tooth block 412 to disengage from the teeth of the limiting tooth ring 421. At this time, the first rotating part 42 and the second rotating part 43 are locked in contact, and the first rotating part 42 can rotate freely relative to the second rotating part 43.

[0035] After being adjusted to the appropriate position, the screw 411 can be rotated in the opposite direction. The meshing tooth block 412 moves toward the limiting tooth ring 421 under the action of the screw drive until it is fully engaged with the teeth of the limiting tooth ring 421. At this time, the first rotating part 42 and the second rotating part 43 are rigidly connected by the tooth surface friction and the preload of the screw 411, which can fix the first rotating part 42 and the second rotating part 43. Correspondingly, the relative position of the pilot valve 20 and the main valve 10 can be adjusted.

[0036] In summary, the pilot-operated safety valve 100 provided by the present invention can flexibly adjust the relative position between the main valve 10 and the pilot valve 20 through the rotary joint 32. This not only greatly improves the adaptability and flexibility of the safety valve in different installation environments and reduces the difficulties and time costs in the installation process, but also ensures the stability and reliability of the safety valve during operation.

[0037] like Figure 3 As shown, in some embodiments, the meshing tooth block 412 is provided with a sliding post 413, and the rotating ring seat 431 is provided with a guide groove 432 that cooperates with the sliding post 413. The guide groove 432 extends radially along the limiting tooth ring 421. When the screw 411 rotates and drives the meshing tooth block 412 to move, the sliding post 413 slides synchronously within the guide groove 432 to limit the movement path of the limiting tooth block. This effectively prevents the meshing tooth block 412 from deviating or wobbling during movement, and helps improve the accuracy and reliability of the meshing tooth block 412 engaging and disengaging with the limiting tooth ring 421.

[0038] like Figure 1 As shown, in some embodiments, the joint between the connecting pipe 31 and the main valve 10 is a rotary joint 32. The rotary joint 32 also includes a fixing plate 321, which is connected to the rotating ring seat 431. The pilot valve 20 is provided with a mounting plate 23, which is connected to the fixing plate 321 by a bolt structure, a snap-fit ​​structure, or welding, so that the pilot valve 20 and the second rotating part 43 rotate synchronously.

[0039] Specifically, the first rotating part 42 can be connected to the main valve 10 via a standard interface, and the second rotating part 43 and its rotating seat 431 can rotate relative to the first rotating part 42. The rotating seat 431 can drive the pilot valve 20 to rotate synchronously via the fixing plate 321 and the mounting plate 23. This synchronous rotation mechanism allows the position of the pilot valve 20 to be flexibly adjusted according to the actual installation space and layout requirements when installing the pilot-operated safety valve 100, greatly improving the flexibility and adaptability of installation. At the same time, during the operation of the safety valve, the synchronous rotation of the pilot valve 20 and the second rotating part 43 can ensure the stability and sealing of the fluid passage, ensuring the normal operation of the safety valve.

[0040] Furthermore, the fixing plate 321 is provided with fixing holes, and the mounting plate 23 is provided with mounting holes that match the fixing holes. Bolts can be inserted into the fixing holes and the mounting holes to achieve the connection between the mounting plate 23 and the fixing plate 321.

[0041] In this embodiment, the main valve 10 is provided with a first interface 11 and a second interface 12. The first interface 11 is located at the top of the main valve 10, and the second interface 12 is located on the side of the main valve 10. The pilot valve 20 is provided with a third interface 21 and a fourth interface 22, which are arranged side by side on the side of the pilot valve 20. The connecting assembly 30 is provided in two sets, which can be divided into a first assembly and a second assembly. The first assembly is used to connect the first interface 11 and the third interface 21, and the second assembly is used to connect the second interface 12 and the fourth interface 22.

[0042] In the first component, the joint between the connecting pipe 31 and the main valve 10 is set as a rotary joint 32. The fixed plate 321 is connected to the rotating ring seat 431 in the rotary joint 32, and is fixedly connected to the pilot valve 20 through the mounting plate 23. Thus, the position of the pilot valve 20 can be adjusted during the rotation of the second rotating part 43 relative to the first rotating part, so as to achieve synchronous adjustment.

[0043] Furthermore, the joint between the connecting pipe 31 and the main valve 10 is a rotary joint 32, and the joint between the connecting pipe 31 and the pilot valve 20 can be a fixed joint 33, thereby simplifying the structure, reducing the complexity of the connecting assembly 30, and reducing the risk of potential leaks. Of course, in some embodiments, both ends of the connecting pipe 31 can also be rotary joints 32.

[0044] like Figure 1 and Figure 4As shown, in some embodiments, the pilot-operated safety valve 100 includes two filters 51, which are connected in parallel on the connecting pipe 31. The inlet and outlet of each filter 51 are provided with regulating valves 52, which are used to regulate the fluid flow rate of the filter 51.

[0045] Specifically, two filters 51 are connected in parallel on the connecting pipe 31, providing dual protection for the system. When the filtration performance of one filter 51 decreases due to the accumulation of impurities, the other filter 51 can still function normally, ensuring that the entire system always maintains good filtration performance, effectively intercepting solid particles, impurities, and contaminants in the fluid, which helps to improve the reliability and service life of the safety valve.

[0046] Furthermore, when it is necessary to clean, repair or replace one of the filters 51, simply close the regulating valve 52 at the inlet and outlet of that filter 51 to isolate it from the system, while the other filter 51 can continue to work normally, ensuring that the fluid filtration of the system is not affected. This allows the pilot-operated safety valve 100 to be maintained without shutting down the system, reducing production losses caused by equipment downtime and improving the operating efficiency of the entire industrial system.

[0047] Optionally, the regulating valve 52 may be configured as a switching valve.

[0048] Furthermore, the pilot-operated safety valve 100 also includes two three-way pipes 53, which are respectively located at the inlet and outlet of the filter 51. Each three-way pipe 53 includes a first port 531, a second port 532, and a third port 533. The first port 531 is used to connect to the pilot valve 20 or the main valve 10 via a connecting pipe 31; the second port 532 is used to connect to one of the two filters 51; and the third port 533 is used to connect to the other of the two filters 51. The regulating valve 52 may be located at the second port 532 and the third port 533.

[0049] Furthermore, two filters 51 are disposed on the connecting pipe 31 between the second port 12 of the main valve 10 and the fourth port 22 of the pilot valve 20.

[0050] In this embodiment, the top cover 513 can be connected to the housing 511 via a threaded structure, thereby facilitating the disassembly, cleaning and maintenance of the filter 51.

[0051] like Figure 4 and Figure 5As shown, in some embodiments, the filter 51 includes a housing 511, a support 512, a filter plate, and a top cover 513. The top cover 513 is detachably installed on the housing 511 to define a filter chamber 514. The support 512 is disposed inside the filter chamber 514. The filter plate is disposed above the support 512 to divide the filter chamber 514 into upper and lower parts, wherein the upper part is the inlet area for the fluid to be filtered, and the lower part is the outlet area for the filtered clean fluid.

[0052] In other words, during the operation of filter 51, the fluid to be filtered enters the upper part of filter chamber 514 through the inlet port of housing 511, and flows downward under pressure, passing through the filter plate. During the flow, impurities in the fluid are intercepted by the filter plate, while clean fluid passes through the filter plate into the lower part of filter chamber 514 and is finally discharged from the outlet port.

[0053] Furthermore, the filter cavity 514 can be configured as a cylindrical structure, and the support seat 512 can be configured as an annular shape. The support seat 512 is disposed on the inner wall of the filter cavity 514 to support and fix the filter plate.

[0054] Furthermore, the filter plate includes a first filter screen and a second filter screen. The first filter screen is positioned near the top cover 513 relative to the second filter screen, and the mesh size of the first filter screen is greater than that of the second filter screen. In other words, a coarser mesh filter screen is used near the fluid inlet, while a finer mesh filter screen is used further away from the fluid inlet. Both are fixedly fitted with a rigid frame, and the two are stacked and secured inside the rigid frame, improving the filtration performance and strength of the filter structure at that location.

[0055] like Figure 1 and Figure 4 As shown, in some embodiments, the pilot-operated safety valve 100 further includes a mounting bracket 54, one end of which is connected to the pilot valve 20, and the other end of which is provided with a slot 541 for placing the filter 51, and the inner wall of the slot 541 is provided with a shock-absorbing pad 542.

[0056] Specifically, the mounting bracket 54 may have an annular frame at the end away from the pilot valve 20. This annular frame forms the slot 541, and its annular structure can evenly surround the housing 511 of the filter 51, thus fixing the housing 511 into the slot 541 and providing all-around support and constraint. The shock-absorbing pad 542 can absorb and isolate vibrations and impacts, preventing the vibrations generated by the pilot valve 20 from interfering with the vibrations generated by the filter 51.

[0057] Furthermore, the inner wall of the slot 541 is provided with anti-slip texture, and the shock-absorbing pad 542 is made of silicone and has raised particles on its surface. The raised particles abut against the outer wall of the box 511 to achieve anti-slip positioning.

[0058] In this embodiment, the connecting tube 31 is a soft pressure-applying tube, made of high-quality materials such as rubber, polytetrafluoroethylene (PTFE) or silicone.

[0059] Furthermore, one embodiment of the present invention also provides a fluid system including the pilot-operated safety valve 100 provided in any of the above embodiments. It should be noted that the fluid system provided in this application embodiment has the same implementation principle and technical effects as the aforementioned pilot-operated safety valve 100 embodiment. For the sake of brevity, any parts not mentioned in the fluid system embodiment section can be referred to the corresponding content in the aforementioned pilot-operated safety valve 100 embodiment.

[0060] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "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.

[0061] 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 technical features indicated. 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.

[0062] 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.

[0063] 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.

[0064] In this invention, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the 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.

[0065] 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, The device includes a main valve, a pilot valve, and a connecting assembly. The connecting assembly includes a connecting pipe and two connectors, which are located at opposite ends of the connecting pipe to connect the main valve and the pilot valve. At least one of the connectors is a rotary connector. The rotary connector includes a positioning component, a first rotating part, and a second rotating part connected to each other. The first rotating part is connected to the main valve or the pilot valve, and the second rotating part is connected to the connecting pipe. The first rotating part is rotatable relative to the second rotating part. The first rotating part is provided with a limiting toothed ring, and the second rotating part is provided with a rotating ring seat. The rotating ring seat is sleeved on the outside of the limiting toothed ring. The positioning component includes a screw and a meshing tooth block located at the end of the screw. The screw extends radially along the limiting toothed ring and is threadedly connected to the rotating ring seat. The screw is rotatable relative to the rotating ring seat to drive the meshing tooth block to engage or disengage with the limiting toothed ring, thereby fixing the first rotating part and the second rotating part.

2. The pilot-operated safety valve according to claim 1, characterized in that, The meshing tooth block is provided with a sliding post, and the rotating ring seat is provided with a guide groove that cooperates with the sliding post. The guide groove extends along the radial direction of the limiting tooth ring.

3. The pilot-operated safety valve according to claim 1, characterized in that, The joint between the connecting pipe and the main valve is a rotary joint. The rotary joint also includes a fixing plate, which is connected to the rotating ring seat. The pilot valve is provided with a mounting plate, which is connected to the fixing plate by bolts, snap-fit, or welding, so that the pilot valve and the second rotating part rotate synchronously.

4. The pilot-operated safety valve according to claim 1, characterized in that, It also includes two filters, which are connected in parallel on the connecting pipe. Both the inlet and outlet of the filters are equipped with regulating valves, which are used to regulate the fluid flow rate of the filters.

5. The pilot-operated safety valve according to claim 4, characterized in that, The filter includes a housing, a support, a filter plate, and a top cover. The top cover is detachably installed on the housing to define a filter chamber. The support is disposed inside the filter chamber, and the filter plate is disposed above the support to divide the filter chamber into upper and lower parts.

6. The pilot-operated safety valve according to claim 5, characterized in that, The filter plate includes a first filter screen and a second filter screen. The first filter screen is disposed close to the top cover relative to the second filter screen, and the mesh count of the first filter screen is greater than that of the second filter screen.

7. The pilot-operated safety valve according to claim 5, characterized in that, It also includes a mounting bracket, one end of which is connected to the pilot valve, and the other end of which is provided with a slot for placing the filter, and the inner wall of the slot is provided with a shock-absorbing pad.

8. The pilot-operated safety valve according to claim 7, characterized in that, The inner wall of the slot is provided with anti-slip texture, and the shock-absorbing pad is made of silicone with raised particles on the surface. The raised particles abut against the outer wall of the box to achieve anti-slip positioning.

9. The pilot-operated safety valve according to claim 1, characterized in that, The connecting pipe is a soft pressure-applying pipe.

10. A fluid system, characterized in that, The pilot-operated safety valve includes any one of claims 1 to 9.

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