High pressure difference two-stage pressure reducing valve

Abstract

The utility model relates to pressure reducing valve technical field especially relates to a high pressure difference two stage pressure reducing valve. It includes lower valve body, middle valve body and upper valve body, and the lower valve body is connected with the middle valve body through the bottom bolt of being set to its bottom, and the upper valve body is connected with the middle valve body through the top bolt of being set to its top, is equipped with the air inlet hole of being linked with lower valve body air inlet channel on the lateral wall of lower valve body, is equipped with the air outlet hole of being linked with middle valve body gas guide channel on the lateral wall of middle valve body, is equipped with a first pressure reducing mechanism between lower valve body and middle valve body, is equipped with two stage pressure reducing mechanism between middle valve body and upper valve body, and two stage pressure reducing mechanism and first pressure reducing mechanism linkage cooperation. It structure design is reasonable, and the operation is convenient, and through two stage pressure reduction, can effectively solve the export end pressure not stable, the big difficulty of regulating under the high pressure situation of inlet end and the use range limited caused by the difficulty of handling high pressure difference pressure caused by the big pressure fluctuation range of inlet end, solves the problem existing in practical use.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, and in particular to a high pressure differential two-stage pressure reducing valve. Background Technology

[0002] A pressure reducing valve is a control valve used to automatically reduce fluid pressure and stabilize output. It is widely used in pneumatic, hydraulic, water supply, and gas systems. Its core function is to protect downstream equipment from high-pressure surges and ensure the safe and stable operation of the system. Currently, most pressure reducing valves on the market are single-stage valves, which still have several shortcomings in practical use: First, when the pressure fluctuation range at the inlet is large, the pressure reducing valve struggles to maintain the stability of the outlet pressure, and can only achieve this by sacrificing flow rate. As the flow rate increases, the pressure reducing effect of the valve decreases. Second, when high pressure is directly supplied to the inlet, the adjustment of the pressure reducing valve becomes difficult, affecting its accuracy and stability. Third, under special operating conditions, this type of pressure reducing valve struggles to handle pressure differences with much higher pressure differentials, unable to reduce the extremely high pressure at the inlet to the extremely low pressure at the outlet. This is mainly because the pressure reducing valve itself has limited structural strength; forced use can lead to cavitation, noise, and excessive wear, severely reducing its service life and making it unsuitable for complex operating conditions. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, this utility model provides a two-stage pressure reducing valve with high pressure differential. It has a reasonable structural design and is easy to operate. Through two-stage pressure reduction, it can effectively solve the problems of unstable outlet pressure caused by large pressure fluctuation range at the inlet end, difficulty in adjustment under high pressure at the inlet end, and limited application range caused by difficulty in handling high pressure differential pressure. It solves the problems existing in actual use.

[0004] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0005] A two-stage pressure reducing valve with high pressure differential includes a lower valve body, a middle valve body, and an upper valve body. The lower valve body is connected to the middle valve body by several bottom bolts located at its bottom, and the upper valve body is connected to the middle valve body by several top bolts located at its top. An air inlet is provided on the side wall of the lower valve body, which is connected to the air inlet channel of the lower valve body. An air outlet is provided on the side wall of the middle valve body, which is connected to the air guide channel of the middle valve body. A primary pressure reducing mechanism is provided between the lower valve body and the middle valve body, and a secondary pressure reducing mechanism is provided between the middle valve body and the upper valve body. The secondary pressure reducing mechanism is linked and cooperates with the primary pressure reducing mechanism.

[0006] Optionally, the primary pressure reducing mechanism includes a pressure reducing channel located at the center of the bottom of the lower valve body. The upper end of the pressure reducing channel is connected to the center of the bottom of the intake channel. A limiting tube is provided at the bottom of the lower valve body outside the pressure reducing channel. A pressure regulator seat is provided inside the limiting tube. The pin seat of the pressure regulator seat is threaded into the limiting tube, and its pin rod is closed and inserted into the pressure reducing channel, sealingly connecting with the pressure reducing channel. A primary sealing gasket is provided at the top of the pressure regulator seat. A locking sleeve is threaded onto the top of the pin rod of the pressure regulator seat, limiting the primary sealing gasket to the top of the pin rod of the pressure regulator seat. A valve core guide sleeve is movably engaged in the intake channel above the intake port. The first-stage valve core is sealed to the intake passage. It is movably inserted into the valve core guide sleeve, with its lower end abutting against the first-stage sealing gasket and its upper end connected to the first-stage diaphragm via a first-stage diaphragm bolt. The edge of the first-stage diaphragm is fixedly engaged between the lower valve body and the middle valve body. A valve core groove is provided in the center of the top of the valve core guide sleeve. A flange is provided on the outer wall of the first-stage valve core below the first-stage diaphragm, which is movably engaged in the valve core groove. A first-stage spring is provided in the valve core groove, which is sleeved on the first-stage valve core. At least one first-stage pressure relief channel is provided on the side wall of the middle valve body, which is connected to the air guide passage. A first-stage pressure relief plug is provided on the outside of the first-stage pressure relief channel.

[0007] Optionally, a lower groove for the valve core is provided at the bottom of the valve core guide sleeve, and a sealing ring cover that is fitted onto the outer wall of the first-stage valve core is movably engaged in the lower groove for the valve core. A valve core sealing ring that is fitted onto the first-stage valve core is provided in the lower groove for the valve core above the sealing ring cover. A valve core limiting groove is provided around the inner wall of the valve core guide sleeve below the sealing ring cover, and a cover elastic retaining ring is movably engaged in the valve core limiting groove and abuts against the bottom of the sealing ring cover.

[0008] Optionally, a filter tube is provided in the air intake channel below the valve core guide sleeve, which is sleeved on the regulator seat rod, and a gap is left between the upper end of the filter tube and the bottom of the valve core guide sleeve.

[0009] Optionally, it also includes a primary pressure regulating mechanism, which includes a primary channel disposed within the lower valve body and the middle valve body. An air supply groove is arranged around the upper part of the air inlet channel of the lower valve body. The top of the vertical section of the primary channel is connected to the air outlet, and the bent section disposed within the lower valve body is connected to the air supply groove. Several vent holes are provided on the upper part of the outer wall of the valve core guide sleeve, which are connected to the groove on the valve core. A flow restrictor is provided on the primary diaphragm corresponding to the position of the primary channel. The flow restrictor is fixedly snapped into the primary channel, and a fine hole is provided in the flow restrictor that is connected to the primary channels on both sides.

[0010] Optionally, the secondary pressure reducing mechanism includes a secondary diaphragm fixedly engaged between the middle valve body and the upper valve body. A secondary diaphragm bolt is provided in the middle of the secondary diaphragm. A lower pressure plate is threadedly connected to the upper part of the secondary diaphragm bolt screw. A locking nut is threadedly connected to the opening at the top of the upper valve body. A vertically arranged setting screw passes vertically through the middle of the locking nut and abuts against the top of the upper pressure plate in the upper valve body. A secondary spring is provided in the normal pressure channel of the upper valve body between the lower and upper pressure plates. A lower retaining groove is provided in the center of the top of the middle valve body. A valve stem guide sleeve is sealed and engaged in the air guide channel of the middle valve body. Its upper part is movably engaged in the lower retaining groove. A valve stem is movably engaged in the valve stem guide sleeve. The valve stem is thicker at the top and thinner at the bottom. The upper part of the valve stem abuts against the inner wall of the valve stem guide sleeve, and its upper end abuts against the bottom of the secondary diaphragm bolt. The lower end abuts against the secondary sealing gasket. A fixing plate is fixed in the central groove at the bottom of the middle valve body. A fixing plate limiting groove is provided in the air guide channel below the fixing plate. A fixing plate elastic retaining ring is fixed in the fixing plate limiting groove and abuts against the bottom of the fixing plate. The bottom of the fixing plate abuts against the primary valve core. A secondary valve core is provided in the air guide channel between the fixing plate and the valve stem guide sleeve. The secondary sealing gasket is fixed in the groove of the secondary valve core. Several diversion holes are provided in the secondary valve core outside the secondary sealing gasket. A return spring is movably fixed between the secondary valve core and the fixing plate. An air guide hole communicating with the air outlet is provided on the valve stem guide sleeve. At least one secondary pressure relief channel communicating with the normal pressure channel is provided on the side wall of the upper valve body. A secondary pressure relief plug is provided outside the secondary pressure relief channel.

[0011] Optionally, a protective cap that covers the set screw can be threaded onto the lock nut.

[0012] Optionally, an upper retaining groove is provided at the center of the bottom of the upper valve body, and a pressure reducing ring located outside the secondary diaphragm bolt is engaged in the upper retaining groove.

[0013] Optionally, it also includes a secondary pressure regulating mechanism, which includes a secondary channel disposed in the middle valve body. The upper end of the secondary channel is connected to the lower slot, and the lower end is connected to the air outlet.

[0014] Optionally, a pressure-stabilizing and limiting groove is provided around the lower part of the inner wall of the limiting tube, and a pressure-stabilizing elastic retaining ring is movably engaged in the pressure-stabilizing and limiting groove.

[0015] The advantages of this utility model, which adopts the above technical solution, are as follows:

[0016] 1. It has higher adjustment accuracy and stability. The pressure at the inlet end, which fluctuates greatly, is reduced to a stable intermediate pressure through the first-stage pressure reducing mechanism. Then, the intermediate pressure is finely adjusted through the second-stage pressure reducing mechanism, so that the outlet end obtains a stable and accurate pressure (the first-stage pressure reducing mechanism mainly deals with changes in flow rate, while the second-stage pressure reducing mechanism mainly makes more precise fine adjustments, so that the pressure and flow characteristics of the entire system are smoother).

[0017] 2. Even if there is high pressure at the inlet, it can effectively adapt to and compensate for large pressure fluctuations at the inlet without sacrificing flow rate, ensuring that the pressure reducing valve plays its normal regulating role.

[0018] 3. When dealing with special working conditions, it can effectively reduce the extremely high pressure at the inlet to the extremely low pressure at the outlet. The pressure reducing valve can ensure its own structural strength to avoid cavitation, noise and excessive wear, and improve its service life.

[0019] 4. Enhanced safety performance: Even if the primary pressure reducing mechanism malfunctions (e.g., stuck at a certain opening and unable to be adjusted), the secondary pressure reducing mechanism can still provide some pressure regulation, offering the system a certain degree of operational capability and giving maintenance personnel ample time for repairs. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 for Figure 1 A top-view structural diagram;

[0022] Figure 3 for Figure 2 A schematic diagram of the AA-direction cross-section structure;

[0023] Figure 4 for Figure 2 Schematic diagram of the BB-directed cross-sectional structure;

[0024] Figure 5 This is a three-dimensional structural diagram of the lower valve body;

[0025] Figure 6 This is a three-dimensional structural diagram of the valve body.

[0026] Figure 7 This is a three-dimensional structural diagram of the upper valve body;

[0027] Figure 8 This is a schematic diagram of the three-dimensional structure of the current limiter;

[0028] In the diagram, 1. Lower valve body; 2. Middle valve body; 3. Upper valve body; 4. Bottom bolt; 5. Top bolt; 6. Air inlet channel; 7. Air inlet hole; 8. Air guide channel; 9. Air outlet hole; 10. Lower pressure channel; 11. Limiting tube; 12. Pressure regulator seat; 1201. Bolt seat; 1202. Bolt rod; 13. Primary sealing gasket; 14. Locking sleeve; 15. Valve core guide sleeve; 16. Primary valve core; 17. Primary diaphragm bolt; 18. Primary diaphragm; 19. Upper groove of valve core; 20. Flange; 21. Primary spring; 22. Primary pressure relief channel; 23. Primary pressure relief plug; 24. Lower groove of valve core; 25. Sealing ring cover; 26. Valve core sealing ring; 27. Valve core limiting groove; 28. Elastic retaining ring of cover; 29. ​​Filter tube; 30. Primary channel; 31. 32. Air supply groove; 33. Vent hole; 34. Flow restrictor; 35. Fine orifice; 36. Secondary diaphragm; 37. Secondary diaphragm bolt; 38. Lower pressure plate; 39. Locking nut; 40. Setting screw; 41. Upper pressure plate; 42. Normal pressure channel; 43. Secondary spring; 44. Lower retaining groove; 45. Valve stem guide sleeve; 46. Valve stem; 47. Secondary sealing gasket; 48. Fixing groove; 49. Fixing plate limiting groove; 50. Fixing plate elastic retaining ring; 51. Secondary valve core; 52. Groove; 53. Diverting hole; 54. Return spring; 55. Air guide hole; 56. Secondary pressure relief channel; 57. Secondary pressure relief plug; 58. Protective cap; 59. Upper retaining groove; 60. Pressure reducing ring; 61. Secondary channel; 62. Pressure stabilizing limiting groove; 63. Pressure stabilizing elastic retaining ring. Detailed Implementation

[0029] To clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application; however, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0030] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, 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 one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0032] like Figure 1-8 As shown, a high-pressure differential two-stage pressure reducing valve includes a lower valve body 1, a middle valve body 2, and an upper valve body 3. The lower valve body 3 is connected to the middle valve body 2 by several bottom bolts 4 located at its bottom, and the upper valve body 3 is connected to the middle valve body 2 by several top bolts 5 located at its top. An air inlet 7 connected to the air inlet channel 6 of the lower valve body 1 is provided on the side wall, and an air outlet 9 connected to the air guide channel 8 of the middle valve body 2 is provided on the side wall. A first-stage pressure reducing mechanism is provided between the lower valve body 1 and the middle valve body 2, and a second-stage pressure reducing mechanism is provided between the middle valve body 2 and the upper valve body 3. The second-stage pressure reducing mechanism is linked and cooperates with the first-stage pressure reducing mechanism.

[0033] Optionally, the primary pressure reducing mechanism includes a pressure reducing channel 10 located at the center of the bottom of the lower valve body 1. The upper end of the pressure reducing channel 10 is connected to the center of the bottom of the air intake channel 6. A limiting tube 11 is provided at the bottom of the lower valve body 1 outside the pressure reducing channel 10. A pressure regulator seat 12 is provided inside the limiting tube 11. The bolt seat 1201 of the pressure regulator seat 12 is threadedly connected to the limiting tube 11, and its bolt 1202 is closed and inserted into the pressure reducing channel 10 and sealed to the pressure reducing channel 10. A primary sealing gasket 13 is provided at the top of the pressure regulator seat 12. A locking sleeve 14 is threaded onto the top of the bolt 1202 of the pressure regulator seat 12, limiting the primary sealing gasket 13 to the top of the bolt 1202 of the pressure regulator seat 12. A valve core guide sleeve 1 is movably engaged in the air intake channel 6 above the air intake port 7. 5. The valve core guide sleeve 15 is sealed and connected to the air intake channel 6. The first-stage valve core 16 is movably inserted into the valve core guide sleeve 15, with its lower end abutting against the first-stage sealing gasket 13 and its upper end connected to the first-stage diaphragm 18 through the first-stage diaphragm bolt 17. The edge of the first-stage diaphragm 18 is fixedly engaged between the lower valve body 1 and the middle valve body 2. A valve core groove 19 is provided in the center of the top of the valve core guide sleeve 15. A flange 20 is provided on the outer wall of the first-stage valve core 16 below the first-stage diaphragm 18, which is movably engaged in the valve core groove 19. A first-stage spring 21 is provided in the valve core groove 19, which is sleeved on the first-stage valve core 16. At least one first-stage pressure relief channel 22 is provided on the side wall of the middle valve body 2, which is connected to the air guide channel 8. A first-stage pressure relief plug 23 is provided on the outside of the first-stage pressure relief channel 22.

[0034] Optionally, a lower groove 24 for the valve core is provided at the bottom of the valve core guide sleeve 15. A sealing ring cover 25, which is fitted onto the outer wall of the first-stage valve core 16, is movably engaged in the lower groove 24. A valve core sealing ring 26, which is fitted onto the first-stage valve core 16, is provided in the lower groove 24 above the sealing ring cover 25. A valve core limiting groove 27 is provided around the inner wall of the valve core guide sleeve 15 below the sealing ring cover 25. A cover elastic retaining ring 28 is movably engaged in the valve core limiting groove 27 and abuts against the bottom of the sealing ring cover 25. The cover elastic retaining ring 28 can limit the position of the sealing ring cover 25 to remain unchanged with respect to the valve core guide sleeve 15, thereby limiting the position of the valve core sealing ring 26 to remain unchanged, thus improving the sealing performance between the valve core guide sleeve 15 and the first-stage valve core 16.

[0035] Optionally, a filter tube 29 is provided in the air intake channel 6 below the valve core guide sleeve 15, which is sleeved on the bolt 1202 of the pressure regulator seat 12. A gap is left between the upper end of the filter tube 29 and the bottom of the valve core guide sleeve 15. The filter tube 29 not only filters the gas entering from the air intake port 7, preventing impurities from entering the pressure reducing valve and extending its service life, but also reduces gas impact, thus reducing noise.

[0036] Optionally, it also includes a primary pressure regulating mechanism, which includes a primary channel 30 disposed in the lower valve body 1 and the middle valve body 2. An air supply groove 31 is arranged around the upper part of the air inlet channel 6 of the lower valve body 1. The top of the vertical section of the primary channel 30 is connected to the air outlet 9, and the bent section disposed in the lower valve body 1 is connected to the air supply groove 31. Several vent holes 32 are provided on the upper part of the outer wall of the valve core guide sleeve 15, which are connected to the groove 19 on the valve core. A flow restrictor 33 is provided on the primary diaphragm 18 corresponding to the position of the primary channel 30. The flow restrictor 33 is fixedly snapped into the primary channel 30. A fine hole 34 is provided in the flow restrictor 33, which is connected to the primary channels 30 on both sides. When the gas passes through the primary and secondary pressure reducing mechanisms and is finally ejected from the outlet, a portion of the gas enters the primary channel 30 and gradually fills the gap between the primary diaphragm 18 and the valve core guide sleeve 15 through the flow restrictor 33. It also fills the gap between the valve core guide sleeve 15 and the primary valve core 16 through the various vent holes 32, thereby buffering the deformation of the primary diaphragm 18 and improving its service life.

[0037] Optionally, the secondary pressure reducing mechanism includes a secondary diaphragm 35 fixedly engaged between the middle valve body 2 and the upper valve body 3. A secondary diaphragm bolt 36 is provided in the middle of the secondary diaphragm 35. A lower pressure plate 37 is threadedly connected to the upper part of the secondary diaphragm bolt 36. A locking nut 38 is threadedly connected to the opening at the top of the upper valve body 3. A vertically arranged setting screw 39 passes vertically through the middle of the locking nut 38 and abuts against the top of the upper pressure plate 40 disposed inside the upper valve body 3. A secondary spring 42 is installed in the normal pressure channel 41 of the upper valve body 3 between the upper pressure plate 40 and the upper pressure plate 7; a lower slot 43 is provided in the center of the top of the middle valve body 2, and a valve stem guide sleeve 44 is sealed and engaged in the air guide channel 8 of the middle valve body 2. Its upper part is movably engaged in the lower slot 43, and a valve stem 45 is movably engaged in the valve stem guide sleeve 44. The valve stem 45 is thicker at the top and thinner at the bottom. The upper part of the valve stem 45 abuts against the inner wall of the valve stem guide sleeve 44, its upper end abuts against the bottom of the secondary diaphragm bolt 36, and its lower end abuts against... On the secondary sealing gasket 46, a fixing groove 47 is fixed at the bottom center of the valve body 2. A fixing plate 48 is engaged in the fixing groove 47. A fixing plate limiting groove 49 is provided in the air guide channel 8 below the fixing plate 48. A fixing plate elastic retaining ring 50 is engaged in the fixing plate limiting groove 49 and abuts against the bottom of the fixing plate 48. The bottom of the fixing plate 48 abuts against the primary valve core 16. A secondary valve core 51 is provided in the air guide channel 8 between the fixing plate 48 and the valve stem guide sleeve 44. The secondary sealing gasket 46... The gasket 46 is snapped into the groove 52 of the secondary valve core 51. Several diversion holes 53 are provided in the secondary valve core 51 outside the secondary sealing gasket 46. A return spring 54 is movably snapped between the secondary valve core 51 and the fixed plate 48. A vent hole 55 connected to the vent hole 9 is provided on the valve stem guide sleeve 44. At least one secondary pressure relief channel 56 connected to the normal pressure channel 41 is provided on the side wall of the upper valve body 3. A secondary pressure relief plug 57 is provided outside the secondary pressure relief channel 56.

[0038] Optionally, a protective cap 58 is threaded onto the lock nut 38 and covers the set screw 39. The protective cap 58 can protect the set screw 39 from the influence of external forces.

[0039] Optionally, an upper retaining groove 59 is provided at the center of the bottom of the upper valve body 3, and a pressure-reducing ring 60 located outside the secondary diaphragm bolt 36 is engaged in the upper retaining groove 59. The pressure-reducing ring 60 can limit the flipping position of the secondary diaphragm 35 to prevent the secondary diaphragm 35 from flipping upward, thereby reducing the pressure on the secondary spring 42, the upper pressure plate 40 and the lower pressure plate 37, so that the setting screw 39 can better perform its adjustment function.

[0040] Optionally, a secondary pressure regulating mechanism is also included. This mechanism comprises a secondary channel 61 disposed within the middle valve body 2. The upper end of the secondary channel 61 is connected to the lower retaining groove 43, and its lower end is connected to the air outlet 9. When gas passes through the primary and secondary pressure reducing mechanisms and is finally ejected from the air outlet 9, a portion of the gas enters the secondary channel 61, filling the gap between the secondary diaphragm 35 and the lower retaining groove 43. This buffers the deformation of the secondary diaphragm 35, thereby improving its service life.

[0041] Optionally, a pressure-stabilizing limiting groove 62 is provided around the lower part of the inner wall of the limiting tube 11, and a pressure-stabilizing elastic retaining ring 63 is movably engaged in the pressure-stabilizing limiting groove 62. The pressure-stabilizing elastic retaining ring 63 can limit the downward movement of the voltage regulator seat 12, preventing the pin seat 1201 of the voltage regulator seat 12 from disengaging from the limiting tube 11.

[0042] Before using this device, the pressure at both ends of the pressure reducing valve needs to be set. By turning the bottom of the pressure regulator seat 1201, the pressure regulator seat 12 is rotated radially, causing the first-stage sealing gasket 13 to move downward. The first-stage valve core 16 moves downward together under the restoring force of the first-stage diaphragm 18. At this time, the first-stage spring 21 keeps the valve core guide sleeve 15 at the lower end of the air intake channel 6 during the downward movement of the first-stage valve core 16, thus setting the pressure at the lower end. Then, open the protective cap 58 to expose the setting screw 39. Turn the setting screw 39 to move downward on the locking nut 38. The bottom end of the setting screw 39 pushes the upper pressure plate 40 downward, which in turn moves the second-stage diaphragm 35 downward through the second-stage spring 42, the lower pressure plate 37, and the second-stage diaphragm bolt 36. This, in turn, pushes the valve stem 45 downward through the second-stage diaphragm bolt 36. The valve stem 45 presses down on the secondary sealing gasket 46, thereby adjusting the pressure between the valve stem guide sleeve 44 and the secondary sealing gasket 46. During this process, the return spring 54 supports the secondary valve core 51 to ensure that it always abuts against the bottom end of the valve stem guide sleeve 44, so as to complete the setting of the pressure at the upper end of the pressure reducing valve.

[0043] In operation, gas enters the intake channel 6 of the lower valve body 1 through the intake port 7 and passes through the gap between the filter tube 29 and the valve core guide sleeve 15. As the gas accumulates, the pressure at the bottom of the valve core guide sleeve 15 increases, pushing it upward within the intake channel 6. During this movement, the first-stage spring 21 drives the first-stage valve core 16 upward, causing the first-stage diaphragm 18 to flip upward. As the first-stage valve core 16 moves, it disengages from the first-stage sealing gasket 13, allowing the gas to smoothly enter it. The gas then passes through the fixed plate 48 and the various diversion holes 53 on the second-stage valve core 51, filling the gap between the second-stage valve core 51 and the valve stem guide sleeve 44. As the gas accumulates and the pressure increases, the valve stem guide sleeve 44 moves upward within the air guide channel 8, allowing the gas to enter the narrow end of the valve stem guide sleeve 44 and the valve stem 45. Finally, the gas enters the outlet port 9 through the air guide hole 55 on the valve stem guide sleeve 44.

[0044] When the gas discharge rate increases, more gas is discharged from the outlet 9, causing a pressure drop on one side of the outlet 9. This disrupts the force balance of the secondary diaphragm 35, and the secondary valve core 51 moves downward under the force of the secondary spring 42, allowing more gas to pass through. As more gas passes through the secondary pressure reducing mechanism, the pressure in the primary pressure reducing mechanism decreases, further disrupting the force balance of the primary diaphragm 18. The primary diaphragm 18 moves upward under the force of the primary spring 21, increasing the gap between the primary valve core 16 and the primary sealing gasket 13, allowing more gas to enter from the inlet 7, thus bringing the primary diaphragm 18 to a new equilibrium point. When the gas discharge rate decreases, the reaction is the reverse of the process when the gas discharge rate increases. Its reasonable structural design and convenient operation, through two-stage pressure reduction, effectively solve the problems of unstable outlet pressure caused by large inlet pressure fluctuations, difficulty in adjustment under high inlet pressure, and limited application range due to difficulty in handling high pressure differentials, thus resolving issues encountered in practical use.

[0045] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0046] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A two-stage pressure reducing valve with high pressure differential, characterized in that, It includes a lower valve body, a middle valve body, and an upper valve body. The lower valve body is connected to the middle valve body by several bottom bolts located at its bottom, and the upper valve body is connected to the middle valve body by several top bolts located at its top. The lower valve body has an air inlet hole on its side wall that communicates with the lower valve body's air inlet channel, and the middle valve body has an air outlet hole on its side wall that communicates with the middle valve body's air guide channel. A primary pressure reducing mechanism is provided between the lower valve body and the middle valve body, and a secondary pressure reducing mechanism is provided between the middle valve body and the upper valve body. The secondary pressure reducing mechanism works in conjunction with the primary pressure reducing mechanism.

2. The high-pressure differential two-stage pressure reducing valve according to claim 1, characterized in that, The primary pressure reducing mechanism includes a pressure reducing channel located at the center of the bottom of the lower valve body. The upper end of the pressure reducing channel is connected to the center of the bottom of the intake channel. A limiting tube is located at the bottom of the lower valve body outside the pressure reducing channel. A pressure regulator seat is located inside the limiting tube. The pin seat of the pressure regulator seat is threaded into the limiting tube, and its pin rod is closed and inserted into the pressure reducing channel, sealingly connecting with the pressure reducing channel. A primary sealing gasket is located at the top of the pressure regulator seat. A locking sleeve is threaded onto the top of the pin rod of the pressure regulator seat, limiting the primary sealing gasket to the top of the pin rod of the pressure regulator seat. A valve core guide sleeve is movably engaged in the intake channel above the intake port. The valve core guide sleeve is connected to the intake port... The air passage is sealed and connected. The first-stage valve core is movably inserted into the valve core guide sleeve, with its lower end abutting against the first-stage sealing gasket. Its upper end is connected to the first-stage diaphragm through the first-stage diaphragm bolt. The edge of the first-stage diaphragm is fixedly engaged between the lower valve body and the middle valve body. A valve core groove is provided in the center of the top of the valve core guide sleeve. A flange is provided on the outer wall of the first-stage valve core below the first-stage diaphragm, which is movably engaged in the valve core groove. A first-stage spring is provided in the valve core groove, which is sleeved on the first-stage valve core. At least one first-stage pressure relief channel is provided on the side wall of the middle valve body, which is connected to the air passage. A first-stage pressure relief plug is provided on the outside of the first-stage pressure relief channel.

3. The high-pressure differential two-stage pressure reducing valve according to claim 2, characterized in that, A lower groove for the valve core is provided at the bottom of the valve core guide sleeve. A sealing ring cover that is fitted onto the outer wall of the first-stage valve core is movably engaged in the lower groove for the valve core. A valve core sealing ring that is fitted onto the first-stage valve core is provided in the lower groove for the valve core above the sealing ring cover. A valve core limiting groove is provided around the inner wall of the valve core guide sleeve below the sealing ring cover. A cover elastic retaining ring is movably engaged in the valve core limiting groove and abuts against the bottom of the sealing ring cover.

4. A two-stage pressure reducing valve with high pressure differential as described in claim 2, characterized in that, A filter tube is installed in the air intake channel below the valve core guide sleeve, which is sleeved on the regulator seat rod. There is a gap between the upper end of the filter tube and the bottom of the valve core guide sleeve.

5. A two-stage pressure reducing valve with high pressure differential as described in claim 2, characterized in that, It also includes a primary pressure regulating mechanism, which includes a primary channel disposed within the lower valve body and the middle valve body. An air supply groove is arranged around the upper part of the air inlet channel of the lower valve body. The top of the vertical section of the primary channel is connected to the air outlet, and the bent section disposed within the lower valve body is connected to the air supply groove. Several vent holes are provided on the upper part of the outer wall of the valve core guide sleeve, which are connected to the groove on the valve core. A flow restrictor is provided on the primary diaphragm corresponding to the position of the primary channel. The flow restrictor is fixedly snapped into the primary channel, and a fine hole is provided in the flow restrictor that is connected to the primary channels on both sides.

6. A two-stage pressure reducing valve with high pressure differential according to claim 2, characterized in that, The secondary pressure reducing mechanism includes a secondary diaphragm fixedly engaged between the middle valve body and the upper valve body. A secondary diaphragm bolt is located in the middle of the secondary diaphragm. A lower pressure plate is threadedly connected to the upper part of the secondary diaphragm bolt screw. A locking nut is threadedly connected to the opening at the top of the upper valve body. A vertically positioned setting screw passes through the middle of the locking nut and abuts against the top of the upper pressure plate inside the upper valve body. A secondary spring is located in the normal pressure channel of the upper valve body between the lower and upper pressure plates. A lower retaining groove is located at the center of the top of the middle valve body. A valve stem guide sleeve is sealed and engaged in the air guide channel of the middle valve body. Its upper part is movably engaged in the lower retaining groove. A valve stem is movably engaged in the valve stem guide sleeve. The valve stem is thicker at the top and thinner at the bottom. The upper part of the valve stem abuts against the inner wall of the valve stem guide sleeve, and its upper end abuts against the bottom of the secondary diaphragm bolt. Its lower end... The valve body is fixed in the central groove at the bottom of the valve body. A fixed disc is engaged in the groove. A fixed disc limiting groove is provided in the air guide channel below the fixed disc. An elastic retaining ring of the fixed disc is engaged in the limiting groove and abuts against the bottom of the fixed disc. The bottom of the fixed disc abuts against the primary valve core. A secondary valve core is provided in the air guide channel between the fixed disc and the valve stem guide sleeve. The secondary sealing gasket is engaged in the groove of the secondary valve core. Several diversion holes are provided in the secondary valve core outside the secondary sealing gasket. A return spring is engaged between the secondary valve core and the fixed disc. An air guide hole communicating with the air outlet is provided on the valve stem guide sleeve. At least one secondary pressure relief channel communicating with the normal pressure channel is provided on the side wall of the upper valve body. A secondary pressure relief plug is provided outside the secondary pressure relief channel.

7. A two-stage pressure reducing valve with high pressure differential as described in claim 6, characterized in that, A protective cap that covers the set screw is threaded onto the lock nut.

8. A two-stage pressure reducing valve with high pressure differential as described in claim 6, characterized in that, An upper slot is provided at the center of the bottom of the upper valve body, and a pressure reducing ring located outside the secondary diaphragm bolt is engaged in the upper slot.

9. A two-stage pressure reducing valve with high pressure differential according to claim 6, characterized in that, It also includes a secondary pressure stabilizing mechanism, which includes a secondary channel disposed in the middle valve body. The upper end of the secondary channel is connected to the lower slot, and the lower end is connected to the air outlet.

10. A two-stage pressure reducing valve with high pressure differential according to claim 2, characterized in that, A pressure-stabilizing and limiting groove is provided around the lower part of the inner wall of the limiting tube, and a pressure-stabilizing elastic retaining ring is movably engaged in the pressure-stabilizing and limiting groove.

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