Fluid control valve with speed change mechanism

Abstract

The utility model provides a fluid control valve with a speed change mechanism. A first flange is welded to the top of a control valve body, a second flange is welded to the left side of the control valve body, a third flange is arranged on the right side of the control valve body, the second flange is connected with a flow inlet through a bolt, and the third flange is connected with a flow outlet through a bolt. The first flange is connected with a driving bin through bolts, the top of the driving bin is rotationally connected with a valve hand wheel, a valve assembly matched with the valve hand wheel is arranged in the control valve body, the top of the driving bin is slidably connected with a speed changing hand wheel, and a speed changing assembly matched with the speed changing hand wheel is arranged in the control valve body. By means of the valve assembly, the speed change assembly and the adjusting assemblies, fine control over the flow speed of the valve body can be completed, meanwhile, changes of the flow speed can be displayed more visually, and therefore the valve body is more suitable for fine adjustment under various conditions.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, in particular to a fluid control valve with a speed change mechanism. Background Art

[0002] A control valve consists of two main components: a valve body assembly and an actuator assembly or actuator system, and is divided into four major series: single-seat series control valves, double-seat series control valves, sleeve series control valves, and self-acting series control valves. Variations of the four types of valves can result in many different applicable structures, each with its special applications, characteristics, advantages, and disadvantages, among which manual control valves can achieve the purpose of convenient operation.

[0003] In the related art, through retrieval, the utility model patent with the patent publication number CN211175394U proposes a new type of fluid control valve, including an inlet pipeline and an outlet pipeline, the connection part of the inlet pipeline and the outlet pipeline is interconnected, the top of the inlet pipeline is welded with a support frame, a threaded rod penetrates through the top of the inner cavity of the support frame, the bottom of the surface of the threaded rod is threadedly connected with a threaded sleeve, both sides of the threaded sleeve are welded with sliders, and both sides of the inner cavity of the support frame are provided with chutes.

[0004] According to the above prior art, the inventor combines related technologies and finds in actual application that this utility model can only roughly control the flow rate of the fluid, and it is not convenient for the operator to control the flow rate of the fluid. When the valve body is about to close, the operator cannot finely adjust the flow rate of the water flow, which increases the difficulty of fine fluid speed control and cannot finely adjust the valve body according to requirements. Therefore, it is very necessary to finely adjust the fluid flow rate. Summary of the Utility Model

[0005] In order to solve the problem that the fluid flow rate cannot be finely changed in the prior art, the utility model provides a fluid control valve with a speed change mechanism;

[0006] The technical solution adopted by the fluid control valve with a speed change mechanism provided by the utility model is as follows:

[0007] A fluid control valve with a speed change mechanism, comprising a control valve body. A first flange is welded to the top of the control valve body, a second flange is welded to the left side of the control valve body, and a third flange is provided on the right side of the control valve body. The second flange is bolted to an inlet port, the third flange is bolted to an outlet port, the first flange is bolted to a drive chamber. A valve handwheel is rotatably connected to the top of the drive chamber. A valve assembly that cooperates with the valve handwheel is provided inside the control valve body. A speed change handwheel is slidably connected to the top of the drive chamber. A speed change assembly that cooperates with the speed change handwheel is provided inside the control valve body. Adjusting assemblies are respectively provided on the side walls of the drive chamber opposite to the valve handwheel and the speed change handwheel.

[0008] Furthermore, the valve assembly includes a screw rod, a first gear, a gear rod, a valve rod, a gear groove, a guide plate, a guide port, and a sliding groove. The guide plate is welded inside the control valve body, and the guide plate is provided with a guide port. The screw rod is welded to the bottom of the valve handwheel. The screw rod passes through the top of the drive chamber. Both ends of the gear rod are rotatably connected to the inner side wall of the drive chamber. The first gear is integrally formed on the side wall of the gear rod. The first gear is meshed and connected with the screw rod. The sliding groove is provided on the inner side wall of the drive chamber. The valve rod is slidably connected to the side wall of the sliding groove. The gear groove is provided on the side wall of the valve rod. The first gear is meshed and connected with the gear groove. The bottom of the screw rod can be closely attached to the guide plate.

[0009] Furthermore, the speed change assembly includes a connecting rod, a second gear, a third gear, a speed change pipe block, a first speed change hole, a second speed change hole, a fixing plate, and a speed change metering unit. The connecting rod is fixedly installed at the bottom of the speed change handwheel. The second gear is welded to the bottom of the connecting rod. The fixing plate is welded to the side wall of the valve rod. The connecting rod passes through the fixing plate and is rotatably connected to the fixing plate. The speed change pipe block is rotatably connected to the outer side wall of the valve rod. The third gear is welded to the side wall of the speed change pipe block. The third gear is meshed and connected with the second gear. The first speed change hole is provided at the bottom of the valve rod. The second speed change hole is provided at the bottom of the speed change pipe block. The speed change metering unit is provided on the side wall of the valve rod.

[0010] Furthermore, the variable-speed metering unit includes a fourth gear, a pointer rod, a metering pipe block, a metering spring, a baffle, a metering groove, and a metering through-hole. A metering pipe block is welded to the side wall of the valve stem. The inner side wall of the metering pipe block is rotatably connected to a pointer rod. A metering through-hole is provided on the side wall of the drive chamber. The metering pipe block passes through the metering through-hole and is slidably connected to the inner side wall of the metering through-hole. One end of the pointer rod passes through the metering pipe block, and a fourth gear is welded to the other end of the pointer rod. The fourth gear is meshed with the third gear. A metering groove is provided on the side wall of the metering through-hole. One end of a metering spring is welded to the side wall of the metering groove, and the other end of the metering spring is welded to a baffle. The side wall of the baffle is slidably connected to the side wall of the metering groove.

[0011] Furthermore, the adjusting assembly includes an engaging wheel disc, a telescopic engaging block, an adjusting block, an adjusting spring, an adjusting groove, a wheel disc groove, and a wheel disc spring. A wheel disc groove is provided at the top of the drive chamber. The engaging wheel disc is slidably connected to the side wall of the wheel disc groove. One end of a wheel disc spring is welded to the side wall of the wheel disc groove, and the other end of the wheel disc spring is welded to the engaging wheel disc. Adjusting blocks are respectively connected to the side walls of the screw rod and the connecting rod. An adjusting groove is provided on the side wall of the adjusting block. One end of an adjusting spring is welded to the side wall of the adjusting groove, and the other end of the adjusting spring is connected to a telescopic engaging block. The other end of the telescopic engaging block is engaged with the engaging wheel disc.

[0012] Furthermore, variable-speed scales are provided on the side wall of the metering pipe block. The variable-speed scales are distributed in a circular pattern around the center of the metering pipe block. The number of variable-speed scales is N, and N≥2.

[0013] Furthermore, measuring scales are respectively provided on both sides of the metering through-hole. Valve scales are provided on the side wall of the measuring scale. The valve scales are longitudinally distributed along the side wall of the measuring scale. The number of valve scales is M, and M≥2.

[0014] Furthermore, the adjusting springs are distributed in a circular pattern around the center of the engaging wheel disc. The number of adjusting springs is L, and L≥2.

[0015] In summary, the beneficial effects of the present utility model are as follows:

[0016] By adding a drive chamber, the present utility model enables the valve assembly to control the opening and closing of the valve body inside it, thereby enabling the variable-speed assembly to perform fine adjustments to the fluid flow rate. The metering unit inside the variable-speed assembly can more intuitively display the control of the flow rate variation. Furthermore, through the adjusting assembly, the valve handwheel and the variable-speed handwheel can be adjusted to achieve fine control of the flow rate of the valve body, and a simple operation method is achieved, reducing the difficulty of controlling the variable speed. This utility model can not only complete fine control of the flow rate of the valve body, but also more intuitively display the change in the flow rate, thus making the valve body more suitable for fine adjustments in various situations. Brief Description of the Drawings

[0017] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 is a schematic top view of the present utility model;

[0019] Figure 3 is the present utility model Figure 2 is a schematic A-A sectional view;

[0020] Figure 4 is the present utility model Figure 2 is a schematic B-B sectional view;

[0021] Figure 5 is a schematic perspective side sectional view of the present utility model;

[0022] Figure 6 is a schematic internal view of the overall structure of the present utility model;

[0023] Figure 7 is the present utility model Figure 4 is an enlarged schematic view of part A;

[0024] Figure 8 is the present utility model Figure 5 is an enlarged schematic view of part B.

[0025] As shown in the figure: 1 - drive chamber, 2 - first flange, 3 - control valve body, 4 - second flange, 5 - third flange, 6 - valve handwheel, 7 - speed change handwheel, 8 - valve stem, 9 - first speed change hole, 10 - second speed change hole, 11 - speed change pipe block, 12 - screw rod, 13 - connecting rod, 14 - second gear, 15 - third gear, 16 - sliding groove, 17 - metering pipe block, 18 - pointer rod, 19 - fourth gear, 20 - measuring scale, 21 - first gear, 22 - gear rod, 23 - fixing plate, 24 - metering spring, 25 - baffle, 26 - metering groove, 27 - engaging wheel disc, 28 - adjusting block, 29 - adjusting spring, 30 - adjusting groove, 31 - telescopic clamping block, 32 - wheel disc spring, 33 - wheel disc groove, 34 - guide plate, 35 - guide port, 36 - inlet port, 37 - discharge port, 38 - metering through hole, 39 - metering scale, 40 - speed change scale, 41 - gear groove. Detailed Description of the Preferred Embodiment

[0026] The following further describes the present utility model in detail with reference to the accompanying Figures 1 - 8 drawings:

[0027] An embodiment of the present utility model discloses a fluid control valve with a speed change mechanism, such as Figure 1 , Figure 2 , Figure 3As shown in the figure, a fluid control valve with a speed change mechanism includes a control valve body 3. A first flange 2 is welded to the top of the control valve body 3, a second flange 4 is welded to the left side of the control valve body 3, and a third flange 5 is provided on the right side of the control valve body 3. The second flange 4 is bolted to an inlet port 36, the third flange 5 is bolted to an outlet port 37, and the first flange 2 is bolted to a drive chamber 1. A valve handwheel 6 is rotatably connected to the top of the drive chamber 1. A valve assembly that cooperates with the valve handwheel 6 is provided inside the control valve body 3. A speed change handwheel 7 is slidably connected to the top of the drive chamber 1. A speed change assembly that cooperates with the speed change handwheel 7 is provided inside the control valve body 3. Adjusting assemblies are respectively provided on the side walls of the drive chamber 1 opposite to the valve handwheel 6 and the speed change handwheel 7. In this embodiment, by adding the drive chamber 1, the valve assembly inside it can control the opening and closing of the valve body, and then the speed change assembly can perform fine adjustment of the fluid flow rate. And through the metering unit inside the speed change assembly, the control of the flow rate speed change can be more intuitively displayed. Furthermore, through the adjusting assembly, the valve handwheel 6 and the speed change handwheel 7 can be adjusted, so as to complete the fine control of the flow rate of the valve body, and achieve a simple operation method and reduce the control difficulty of the speed change.

[0028] As Figure 1 , Figure 3 , Figure 5 , Figure 6 The valve assembly shown includes a screw rod 12, a first gear 21, a gear rod 22, a valve rod 8, a gear groove 41, a deflector 34, a diversion port 35, and a sliding groove 16. A deflector 34 is welded inside the control valve body 3, and a diversion port 35 is opened on the deflector 34. A screw rod 12 is welded to the bottom of the valve handwheel 6. The screw rod 12 passes through the top of the drive chamber 1. Both ends of a gear rod 22 are rotatably connected to the inner side wall of the drive chamber 1. A first gear 21 is integrally formed on the side wall of the gear rod 22. The first gear 21 is meshed with the screw rod 12. A sliding groove 16 is opened on the inner side wall of the drive chamber 1. A valve rod 8 is slidably connected to the side wall of the sliding groove 16. A gear groove 41 is opened on the side wall of the valve rod 8. The first gear 21 is meshed with the gear groove 41. The bottom of the screw rod 12 can be closely attached to the deflector 34. In this embodiment, by adding the screw rod 12, the screw rod 12 drives the first gear 21, and then drives the valve rod 8, so that the bottom of the valve rod 8 is separated from and attached to the deflector 34, thereby controlling the opening and closing of the valve body and roughly controlling the size of the flow rate, and then making it convenient for the speed change assembly to complete the fine control of the fluid flow rate and achieve the speed change effect.

[0029] As Figure 1 , Figure 3 , Figure 6The variable speed assembly shown includes a connecting rod 13, a second gear 14, a third gear 15, a variable speed pipe block 11, a first variable speed hole 9, a second variable speed hole 10, a fixing plate 23, and a variable speed metering unit. A connecting rod 13 is fixedly installed at the bottom of the variable speed handwheel 7. A second gear 14 is welded to the bottom of the connecting rod 13. A fixing plate 23 is welded to the side wall of the valve stem 8. The connecting rod 13 passes through the fixing plate 23 and is rotatably connected to the fixing plate 23. The valve stem 8 is rotatably connected to a variable speed pipe block 11 along the outer side wall. A third gear 15 is welded to the side wall of the variable speed pipe block 11. The third gear 15 is meshed and connected with the second gear 14. A first variable speed hole 9 is opened at the bottom of the valve stem 8. A second variable speed hole 10 is opened at the bottom of the variable speed pipe block 11. A variable speed metering unit is arranged on the side wall of the valve stem 8. In this embodiment, by adding the variable speed pipe block 11, the variable speed handwheel 7 drives the connecting rod 13 and the second gear 14, thereby driving the third gear 15 to drive the variable speed pipe block 11 to rotate, and further enabling the first variable speed hole 9 and the second variable speed hole 10 to intersect with each other, adjusting the change in the fluid flow rate, and controlling it through the adjusting assembly to achieve a fine change in the flow rate.

[0030] As Figure 1 , Figure 4 , Figure 6 , Figure 7 The variable speed metering unit shown includes a fourth gear 19, a pointer rod 18, a metering pipe block 17, a metering spring 24, a baffle 25, a metering groove 26, and a metering through hole 38. A metering pipe block 17 is welded to the side wall of the valve stem 8. A pointer rod 18 is rotatably connected to the inner side wall of the metering pipe block 17. A metering through hole 38 is opened on the side wall of the drive chamber 1. The metering pipe block 17 passes through the metering through hole 38 and is slidably connected to the inner side wall of the metering through hole 38. One end of the pointer rod 18 passes through the metering pipe block 17. A fourth gear 19 is welded to the other end of the pointer rod 18. The fourth gear 19 is meshed and connected with the third gear 15. A metering groove 26 is opened on the side wall of the metering through hole 38. One end of a metering spring 24 is welded to the side wall of the metering groove 26. The other end of the metering spring 24 is welded to a baffle 25. The side wall of the baffle 25 is slidably connected to the side wall of the metering groove 26. In this embodiment, by adding the metering pipe block 17, the fourth gear 19 drives the pointer rod 18 to rotate inside the metering pipe block 17, so that the scale on the metering pipe block 17 can intuitively display the flow rate of the fluid, and further adjust and control the flow rate of the fluid, achieving a more precise effect of adjusting the variable speed of the control valve.

[0031] As Figure 1 , Figure 5 , Figure 6 , Figure 8The adjusting assembly shown includes a clamping wheel disc 27, a telescopic clamping block 31, an adjusting block 28, an adjusting spring 29, an adjusting groove 30, a wheel disc groove 33, and a wheel disc spring 32. A wheel disc groove 33 is formed at the top of the driving chamber 1. The side wall of the wheel disc groove 33 is slidably connected with a clamping wheel disc 27. One end of a wheel disc spring 32 is welded to the side wall of the wheel disc groove 33, and the other end of the wheel disc spring 32 is welded to the clamping wheel disc 27. The adjusting blocks 28 are respectively connected to the side walls of the screw rod 12 and the connecting rod 13. An adjusting groove 30 is formed in the side wall of the adjusting block 28. One end of an adjusting spring 29 is welded to the side wall of the adjusting groove 30, and the other end of the adjusting spring 29 is connected to a telescopic clamping block 31. The other end of the telescopic clamping block 31 is engaged with the clamping wheel disc 27. In this embodiment, by adding the clamping wheel disc 27, the telescopic clamping block 31 is engaged with the clamping wheel disc 27 under the action of the adjusting spring 29, so that it can only rotate in the same direction. By pressing the clamping wheel disc 27, the telescopic clamping block 31 can rotate in the opposite direction, thereby controlling the valve assembly and the speed change assembly.

[0032] As Figure 4 、 Figure 6 shown, a speed change scale 40 is provided on the side wall of the metering pipe block 17. The speed change scale 40 is distributed along the rotation of the center of the metering pipe block 17. The number of the speed change scales 40 is N, and N≥2. In this embodiment, by adding the speed change scale 40, the adjustment control effect of the speed change assembly is more intuitively shown, so that the adjustment of the control valve is more convenient, and further it is more convenient for the control valve to perform fine adjustment.

[0033] As Figure 5 shown, measuring rulers 20 are respectively provided on both sides of the measuring through hole 38. Measuring scales 39 are provided on the side walls of the measuring rulers 20. The measuring scales 39 are longitudinally distributed along the side walls of the measuring rulers 20. The number of the measuring scales 39 is M, and M≥2. In this embodiment, by adding the measuring scales 39, the measuring ruler 20 can more intuitively display the position reached by the valve stem 8 in the valve assembly, and can roughly adjust the fluid flow rate, so as to achieve a rough speed change effect of the flow rate, and further the adjustment of the control valve is more convenient.

[0034] As Figure 6 、 Figure 8 shown, the adjusting springs 29 are distributed along the rotation of the center of the clamping wheel disc 27. The number of the adjusting springs 29 is L, and L≥2. In this embodiment, by increasing the number of the adjusting springs 29, the clamping wheel disc 27 is more stable in force and the force in all directions is more uniform.

[0035] The implementation principle of the embodiment of the present utility model is:

[0036] In use, first, the operator rotates the valve handwheel 6, causing the valve handwheel 6 to drive the screw rod 12, which in turn drives the first gear 21 to drive the valve stem 8 to move downward. As a result, the bottom of the valve stem 8 is in close contact with the guide plate 34, and then the telescopic latch 31 rotates and engages along the engagement wheel disc 27, causing the telescopic latch 31 to clamp the engagement wheel disc 27 under the action of the adjustment spring 29. During this process, the control valve can be roughly adjusted for speed change by observing the scale on the measuring ruler 20.

[0037] When precise adjustment of the flow rate is required, due to the close contact between the valve stem 8 and the guide plate 34, the flow guide hole is closed. Then, by adjusting the variable-speed handwheel 7, the transmission connecting rod 13, the second gear 14 are driven, and the third gear 15 is driven to drive the variable-speed pipe block 11 to rotate. As a result, the first variable-speed hole 9 and the second variable-speed hole 10 are staggered with each other, thereby achieving the purpose of fluid speed change, and then the flow rate is changed. The third gear 15 drives the fourth gear 19 to drive the pointer rod 18 to rotate inside the measuring pipe block 17. The pointer rod 18 points to the variable-speed scale 40, and then the fine control of the speed change is more intuitively shown by observing the scale on the measuring pipe block 17.

[0038] The above shows and describes the basic principles, main features and advantages of the present invention. Each component mentioned in the present invention is a common technology in the existing field. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A fluid control valve with a speed change mechanism, comprising a control valve body (3), characterized in that, A first flange (2) is welded to the top of the control valve body (3), a second flange (4) is welded to the left side of the control valve body (3), a third flange (5) is arranged on the right side of the control valve body (3), the second flange (4) is connected to an inlet port (36) by bolts, the third flange (5) is connected to an outlet port (37) by bolts, the first flange (2) is connected to a drive chamber (1) by bolts, a valve handwheel (6) is rotatably connected to the top of the drive chamber (1), a valve assembly that cooperates with the valve handwheel (6) is arranged inside the control valve body (3), a speed change handwheel (7) is slidably connected to the top of the drive chamber (1), a speed change assembly that cooperates with the speed change handwheel (7) is arranged inside the control valve body (3), and adjusting assemblies are respectively arranged on the side walls of the drive chamber (1) opposite to the valve handwheel (6) and the speed change handwheel (7).

2. The fluid control valve with a speed change mechanism according to claim 1, characterized in that The valve assembly includes a screw rod (12), a first gear (21), a gear rod (22), a valve rod (8), a gear groove (41), a guide plate (34), a guide port (35), and a sliding groove (16). The guide plate (34) is welded inside the control valve body (3), the guide plate (34) is provided with the guide port (35), the screw rod (12) is welded to the bottom of the valve handwheel (6), the screw rod (12) passes through the top of the drive chamber (1), both ends of the gear rod (22) are rotatably connected to the inner side wall of the drive chamber (1), the first gear (21) is integrally formed on the side wall of the gear rod (22), the first gear (21) is meshed and connected with the screw rod (12), the sliding groove (16) is formed in the inner side wall of the drive chamber (1), the valve rod (8) is slidably connected to the side wall of the sliding groove (16), the gear groove (41) is formed in the side wall of the valve rod (8), the first gear (21) is meshed and connected with the gear groove (41), and the bottom of the screw rod (12) can be closely attached to the guide plate (34).

3. A fluid control valve with a speed change mechanism according to claim 2, characterized in that, The speed change assembly includes a connecting rod (13), a second gear (14), a third gear (15), a speed change pipe block (11), a first speed change hole (9), a second speed change hole (10), a fixing plate (23), and a speed change metering unit. The connecting rod (13) is fixedly installed at the bottom of the speed change handwheel (7), the second gear (14) is welded to the bottom of the connecting rod (13), the fixing plate (23) is welded to the side wall of the valve rod (8), the connecting rod (13) passes through the fixing plate (23) and is rotatably connected to the fixing plate (23), the speed change pipe block (11) is rotatably connected to the outer side wall of the valve rod (8), the third gear (15) is welded to the side wall of the speed change pipe block (11), the third gear (15) is meshed and connected with the second gear (14), the first speed change hole (9) is formed at the bottom of the valve rod (8), the second speed change hole (10) is formed at the bottom of the speed change pipe block (11), and the speed change metering unit is arranged on the side wall of the valve rod (8).

4. The fluid control valve with a speed change mechanism according to claim 3, characterized in that, The variable-speed metering unit includes a fourth gear (19), a pointer rod (18), a metering pipe block (17), a metering spring (24), a baffle (25), a metering groove (26), and a metering through-hole (38). A metering pipe block (17) is welded to the side wall of the valve rod (8). The inner side wall of the metering pipe block (17) is rotatably connected to a pointer rod (18). A metering through-hole (38) is formed in the side wall of the drive chamber (1). The metering pipe block (17) passes through the metering through-hole (38) and is slidably connected to the inner side wall of the metering through-hole (38). One end of the pointer rod (18) passes through the metering pipe block (17), and a fourth gear (19) is welded to the other end of the pointer rod (18). The fourth gear (19) is meshed with a third gear (15). A metering groove (26) is formed in the side wall of the metering through-hole (38). One end of a metering spring (24) is welded to the side wall of the metering groove (26), and the other end of the metering spring (24) is welded to a baffle (25). The side wall of the baffle (25) is slidably connected to the side wall of the metering groove (26).

5. A fluid control valve with a speed change mechanism according to claim 3, characterized in that, The adjusting assembly includes an engaging wheel disc (27), a telescopic engaging block (31), an adjusting block (28), an adjusting spring (29), an adjusting groove (30), a wheel disc groove (33), and a wheel disc spring (32). A wheel disc groove (33) is formed in the top of the drive chamber (1). An engaging wheel disc (27) is slidably connected to the side wall of the wheel disc groove (33). One end of a wheel disc spring (32) is welded to the side wall of the wheel disc groove (33), and the other end of the wheel disc spring (32) is welded to the engaging wheel disc (27). Adjusting blocks (28) are respectively connected to the side walls of the screw rod (12) and the connecting rod (13). An adjusting groove (30) is formed in the side wall of the adjusting block (28). One end of an adjusting spring (29) is welded to the side wall of the adjusting groove (30), and the other end of the adjusting spring (29) is connected to a telescopic engaging block (31). The other end of the telescopic engaging block (31) is engaged with the engaging wheel disc (27).

6. A fluid control valve with a speed change mechanism according to claim 4, characterized in that, A variable-speed scale (40) is provided on the side wall of the metering pipe block (17). The variable-speed scale (40) is distributed in a circular rotation along the center of the metering pipe block (17). The number of the variable-speed scales (40) is N, and N≥2.

7. A fluid control valve with a speed change mechanism according to claim 4, characterized in that, Metering rulers (20) are respectively provided on both sides of the metering through-hole (38). A metering scale (39) is provided on the side wall of the metering ruler (20). The metering scale (39) is longitudinally distributed along the side wall of the metering ruler (20). The number of the metering scales (39) is M, and M≥2.

8. A fluid control valve with a speed change mechanism according to claim 5, characterized in that, The adjusting springs (29) are distributed in a circular rotation along the center of the engaging wheel disc (27). The number of the adjusting springs (29) is L, and L≥2.

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