An etch resistant passivated diaphragm valve

Abstract

This invention discloses an anti-corrosion passivated diaphragm valve, relating to the field of valve technology, aiming to solve the technical problem of existing diaphragm valves where diaphragm damage is difficult to detect and leakage risks are significant. The diaphragm valve includes a valve body, valve cover, valve disc, a first diaphragm, and a second diaphragm. The bottom of the first diaphragm has umbrella-shaped guide grooves and an annular groove communicating with the guide grooves, the annular groove communicating with a discharge port. The warning part includes a first filling tube fixed in the discharge port, a tee pipe connected to the first filling tube, a fixed cylinder, a piston, and a warning rod. The bottom of the second diaphragm has an integrally formed main sealing strip, a middle sealing strip, and a side sealing strip. One side of the middle sealing strip has a cross-shaped perforation. One side of the second diaphragm is connected to a bottom cylinder through a connecting hole. The top of the bottom cylinder has a top cover for holding an elastic sheet. This diaphragm valve solves the technical problem of existing diaphragm valves where diaphragm damage is difficult to detect in a timely manner, and can provide a warning after leakage. It is suitable for the on / off control of various pipeline media.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and in particular relates to a corrosion-resistant and passivated diaphragm valve. Background Technology

[0002] A diaphragm valve is a shut-off valve that uses a diaphragm as the opening and closing element to close the flow channel, cut off the fluid, and separate the valve body cavity from the valve cover cavity. Diaphragms are usually made of elastic, corrosion-resistant, and non-permeable materials such as rubber and plastic. They have a simple structure, good sealing and corrosion resistance, and low fluid resistance, and are widely used in fields such as chemical and pharmaceutical industries where the purity of the medium is required.

[0003] Existing diaphragm valves lack monitoring methods for diaphragm damage, making it difficult for operators to detect damage in a timely manner. Often, the problem is only discovered after significant leakage or valve malfunction occurs. Furthermore, when a single-layer diaphragm ruptures, the medium directly enters the valve's internal cavity. Without buffering and guiding structures, leaked media easily accumulates within the cavity, causing corrosion to internal valve components. In addition, for diaphragm valves with multi-stage sealing structures, current technology lacks indicators that visually reflect the failure status of each sealing stage. Operators cannot take proactive maintenance measures based on changes in the sealing structure's condition. Therefore, a corrosion-resistant passivated diaphragm valve is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a corrosion-resistant and passivated diaphragm valve that can provide a warning after a leak, thus solving the existing technical problems.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: A corrosion-resistant and passivated diaphragm valve includes: a valve body, a valve cover on the top of the valve body, a pressure cap fitted around the circumference of the valve cover, the pressure cap being threadedly connected to the valve body, a clearance opening on one side of the valve body, slide tracks on both sides of the valve cover, a valve disc slidably connected between the slide tracks, a first diaphragm threadedly connected to the bottom of the valve disc, a second diaphragm threadedly connected to the bottom of the first diaphragm, the first diaphragm and the second diaphragm having the same length and width and being disposed between the valve body and the valve cover; The bottom of the first diaphragm is provided with an annular groove and multiple guide grooves. The guide grooves are distributed in an umbrella shape. The annular groove is connected to the multiple guide grooves. A discharge hole connected to the annular groove is provided on one side of the first diaphragm. A warning unit is located on one side of the first diaphragm to provide a warning in case the second diaphragm is damaged; The drive unit, located on top of the valve cover, is used to drive the valve disc to move.

[0006] Furthermore, the warning unit includes a first filling tube, which is disposed in the discharge hole and extends to the outside of the first diaphragm. One end of the first filling tube is fixedly connected to a tee tube, and one end of the tee tube is fixedly connected to a fixed cylinder. One end of the fixed cylinder is slidably connected to a through warning rod, and one end of the warning rod is fixedly connected to a piston. The piston slides against the inner wall of the fixed cylinder, and a spring is fixedly installed between the piston and the inner wall of one end of the fixed cylinder.

[0007] Furthermore, a fixing groove is formed on the side of the first diaphragm corresponding to the outer end of the discharge hole. An interlocking seat is fixedly installed in the fixing groove. The center of the interlocking seat has a shaft hole for the first filling tube to pass through. The inner and outer ends of the interlocking seat are respectively provided with a liquid inlet groove and a docking groove. The side of the first filling tube is provided with at least one liquid inlet hole communicating with the liquid inlet groove. The end of the tee tube near the first filling tube is provided with a docking protrusion. The docking protrusion is inserted into the docking groove, and the outer circular surface of the docking protrusion is provided with a first sealing ring for forming a sealing fit with the inner circular surface of the docking groove. The interlocking seat is also provided with at least one set of interlocking components for cooperating with the docking protrusion. The interlocking components include a locking rod, an interlocking spring, and an internal hexagonal screw plug. The seat side has a radially open guide hole that communicates with the docking groove. The locking rod is movably disposed in the guide hole. The middle part of the locking rod has a guide flange extending outward. The outer circular surface of the guide flange fits with the inner circular surface of the guide hole. The inner end of the liquid inlet groove has a flow hole that communicates with the space of the outer end of the guide flange corresponding to the guide hole. The internal hexagonal screw plug is threaded to the outer end of the guide hole to limit the outer stroke of the locking rod. The inner end of the guide hole has a limiting flange to limit the inner stroke of the guide flange. The interlocking spring is clamped between the guide flange and the limiting flange. The outer circular surface of the docking protrusion has an annular locking groove. When the locking rod moves axially along the guide hole, it has an unlocked state where the inner end is disengaged from the annular locking groove and a locked state where the inner end is inserted into the annular locking groove.

[0008] Furthermore, a pressure relief pipe is fixedly connected to the bottom of the fixed cylinder, and under normal conditions, the pressure relief pipe is not connected to the tee pipe.

[0009] Furthermore, a transparent collection tube is threadedly connected to the bottom of the pressure relief pipe.

[0010] Furthermore, the collecting cylinder includes a cylinder body and a bottom cover fixedly installed at the lower end of the cylinder body. The bottom cover has a pressure stabilizing hole. The inlet at the upper end of the cylinder body is threadedly connected to the pressure relief pipe. A floating piston is axially movable inside the cylinder body. The outer surface of the floating piston has a second sealing ring for forming a sealing fit with the inner surface of the cylinder body. A return spring is sandwiched between the floating piston and the bottom cover. A guide rod is provided at the bottom of the floating piston. A guide hole is provided on the bottom cover for the guide rod to pass through. The guide rod is threadedly connected to a position corresponding to the lower end of the bottom cover for connection with the lower end of the bottom cover. A limiting nut that limits the upper stroke of the guide rod is provided. The upper end of the floating piston is provided with a drainage channel extending to the lower end of the guide rod. The lower end of the guide rod is provided with an opening and closing groove that communicates with the drainage channel. A conical sealing surface is provided between the drainage channel and the opening and closing groove. A drainage hole that communicates with the opening and closing groove is provided radially on the side of the guide rod. An internal hexagonal headstock adjusting screw is threaded into the opening and closing groove. An opening and closing ball is provided at the upper end of the internal hexagonal headstock adjusting screw. When the internal hexagonal headstock adjusting screw is tightened, the internal hexagonal headstock adjusting screw drives the opening and closing ball to move upward and press against the conical sealing surface, thus closing the drainage channel.

[0011] Furthermore, an electronic pressure gauge is fixedly installed at the end of the three-way pipe away from the fixed cylinder.

[0012] Furthermore, the drive unit includes a screw and a slot. The screw is threaded through the top of the valve cover. An annular limiting groove is provided on the circumference of the screw near the bottom. An open slot is provided on one side of the valve disc. The screw is inserted into the slot through the limiting groove. A square post is integrally formed on the top of the screw. A knob is slidably fitted on the circumference of the square post. A top cap is threaded to the top of the square post for fixing the knob.

[0013] Furthermore, the bottom of the second diaphragm is integrally formed with a main sealing strip, a middle sealing strip, and a side sealing strip. The main sealing strip is located on the side where the medium enters the valve body. The width of the middle sealing strip and the side sealing strip is smaller than that of the main sealing strip. After the main sealing strip fails to seal, the bottom of the side sealing strip undergoes elastic deformation under pressure.

[0014] Furthermore, a through hole is provided on one side of the sealing strip. The through hole is cross-shaped and the end wall away from the medium entry is in a close fit. The other end of the through hole is open. A through connecting hole is provided on one side of the second diaphragm. A second filling tube is fixedly connected in the connecting hole. The second filling tube extends to the outside of the second diaphragm. The second filling tube is L-shaped and a bottom cylinder is fixedly connected to its top. A top cover is fixedly connected to the top of the bottom cylinder. An elastic sheet is clamped and fixed between the top cover and the bottom cylinder. The top of the top cover is inverted conical and a transparent display tube is fixedly connected to its top.

[0015] Furthermore, water is provided inside the top cover and the display tube, and a float ball is placed inside the display tube.

[0016] The embodiments of the present invention have the following beneficial effects: In this invention, the dual arrangement of the first diaphragm and the second diaphragm, combined with the tight clamping of the valve cover and the valve body, allows the second diaphragm to come into contact with the medium. The second diaphragm can be made of a material that is compatible with the medium, which can effectively resist the corrosion of the pipeline medium and facilitate replacement, thus reducing material waste.

[0017] In this invention, through the coordinated use of the various components of the warning unit, the first filling tube, the three-way tube, the fixed cylinder, the warning rod, and the electronic pressure gauge work together. When the second diaphragm is worn and leaking, the pressure signal can be remotely transmitted through the electronic pressure gauge, and the warning rod can extend to provide on-site warning, making it easier for staff to detect and handle the fault in a timely manner and reduce media leakage losses.

[0018] In this invention, by setting the main sealing strip, middle sealing strip, and side sealing strip on the second diaphragm, and coordinating the perforation, the second filling tube, the elastic sheet, and the display tube, when the main sealing strip fails to seal, the movement of the float ball inside the display tube can visually indicate the leakage situation and remind personnel to replace it.

[0019] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 This is a cross-sectional exploded view of an embodiment of the present invention; Figure 3 This is a schematic cross-sectional view of the first diaphragm structure according to an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of a fixed cylinder according to an embodiment of the present invention; Figure 5 This is a schematic cross-sectional view of the second diaphragm structure according to an embodiment of the present invention; Figure 6 This is an embodiment of the present invention. Figure 5 Enlarged structural diagram of section A in the middle; Figure 7 This is a schematic diagram of a perforated structure according to an embodiment of the present invention; Figure 8This is a schematic diagram of the connection structure between the first diaphragm and the three-way tube according to an embodiment of the present invention; Figure 9 This is an embodiment of the present invention. Figure 8 Enlarged structural diagram of section B; Figure 10 This is a schematic cross-sectional view of a collection tube according to an embodiment of the present invention; Figure 11 For an embodiment of the invention Figure 10 Enlarged structural diagram of section C; Figure 12 This is a three-dimensional view of the second diaphragm according to an embodiment of the present invention.

[0022] In the diagram: 1. Valve body; 101. Refractory port; 2. Valve cover; 201. Pressure cap; 3. Knob; 4. Slide rail; 5. Valve disc; 6. First diaphragm; 7. Second diaphragm; 8. Screw; 9. Limiting groove; 10. Slot; 11. Square column; 12. Top cap; 13. Guide groove; 14. Annular groove; 15. Discharge hole; 16. First filling tube; 17. T-connector; 18. Electronic pressure gauge; 19. Fixed cylinder; 20. Piston; 21. Warning rod; 22. Spring; 23. Pressure relief pipe; 24. Collection cylinder; 25. Main sealing strip; 26. Middle sealing strip; 27. Side sealing strip; 28. Perforation; 29. ​​Connecting hole; 30. Second filling tube; 31. Bottom cylinder; 32. Top cover; 33. Elastic sheet; 34. Display tube; 35. Float; 36. 37. Fixed groove; 38. Interlock seat; 39. Shaft hole; 40. Liquid inlet groove; 41. Connecting groove; 42. Liquid inlet hole; 43. Connecting protrusion; 44. First sealing ring; 45. Interlocking assembly; 46. Locking rod; 47. Interlocking spring; 48. Hexagon socket screw plug; 59. Guide hole; 50. Guide flange; 51. Flow hole; 52. Limiting flange; 53. Annular locking groove; 54. Cylinder body; 55. Bottom cover; 56. Pressure stabilizing hole; 57. Floating piston; 58. Second sealing ring; 59. Return spring; 60. Guide rod; 61. Limiting nut; 62. Drainage channel; 63. Opening and closing groove; 64. Conical sealing surface; 65. Drainage hole; 66. Hexagon socket adjusting screw; 67. Opening and closing ball; 68. Connecting nut; 69. Connecting stud. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] To keep the following description of the embodiments of the present invention clear and concise, detailed descriptions of known functions and known components are omitted.

[0025] In one embodiment, please refer to Figures 1-12 As shown, this embodiment provides an anti-corrosion passivated diaphragm valve, including: a valve body 1, which serves as the mounting base for the entire diaphragm valve. The inner wall of the valve body 1 is passivated. A valve cover 2 is provided on the top of the valve body 1. A pressure cap 201 is fitted around the circumference of the valve cover 2. The pressure cap 201 is threadedly connected to the valve body 1. The valve cover 2 is placed on the top of the valve body 1, and the valve cover 2 is pressed by rotating the pressure cap 201. A clearance port 101 is provided on one side of the valve body 1. A slide rail 4 is integrally formed on both sides of the valve cover 2. The two slide rails 4 are symmetrically arranged. The interior of the slide rail 4 is a smooth groove structure. The two ends of the valve disc 5 are respectively embedded in the two slide rails 4 to realize the sliding connection between the valve disc 5 and the slide rail 4. The valve disc 5 can move smoothly up and down along the length direction of the slide rail 4.

[0026] The bottom of valve disc 5 is fitted with a first diaphragm 6 via a threaded connection. This threaded connection facilitates the subsequent disassembly, replacement, and maintenance of the first diaphragm 6. Specifically, a metal stud is injection-molded at the upper end of the first diaphragm 6 and threadedly connected to the threaded hole at the bottom of valve disc 5. This is a conventional technical method. The bottom of the first diaphragm 6 is also threadedly connected to a second diaphragm 7. Specifically, a connecting nut 68 is injection-molded at the lower end of the first diaphragm 6, and a connecting stud 69 is injection-molded at the upper end of the second diaphragm 7. The connecting stud 69 is threadedly connected to the connecting nut 68. The length and width of the two are exactly the same, and they are clamped and fixed between the valve body 1 and the valve cover 2, so that the first diaphragm 6 and the second diaphragm 7 can be tightly attached together. The valve cover 2, through its tight connection with the valve body 1, forms a stable clamping force on the first diaphragm 6 and the second diaphragm 7, ensuring the sealing effect between the two and the valve body 1 and the valve cover 2. At the same time, the dual setting of the first diaphragm 6 and the second diaphragm 7 allows for easy replacement of the second diaphragm 7 individually after wear.

[0027] The bottom of the first diaphragm 6 is machined with an annular groove 14 and multiple guide grooves 13. The guide grooves 13 are evenly distributed in an umbrella shape on the outside of the annular groove 14, and one end of each guide groove 13 is connected to the annular groove 14 to form a complete medium guiding channel. A discharge hole 15 is also machined on one side of the first diaphragm 6. One end of the discharge hole 15 is connected to the annular groove 14, and the other end extends to the outside of the first diaphragm 6. When the medium seeps between the first diaphragm 6 and the second diaphragm 7, it can be guided by the guide grooves 13 and the annular groove 14 and finally discharged from the discharge hole 15, while providing a medium flow channel for the warning section.

[0028] The warning unit is located on one side of the first diaphragm 6. Its core function is to issue a timely warning after the second diaphragm 7 is damaged, so that the staff can discover and deal with it in time and prevent further leakage of the medium. The warning unit includes a first filling tube 16, which is made of corrosion-resistant material. One end of the first filling tube 16 is tightly installed in the discharge hole 15 and the two can be fixed by interference fit. The other end extends to the outside of the first diaphragm 6 to ensure that there is no gap between the first filling tube 16 and the discharge hole 15, so as to prevent the medium from leaking from the connection. A three-way pipe 17 is fixedly connected to the end of the first filling tube 16 that extends to the outside. The three ports of the three-way pipe 17 are respectively connected to the first filling tube 16, the fixed cylinder 19 and the electronic pressure gauge 18 to realize the diversion of the medium and pressure detection.

[0029] A fixed cylinder 19 is fixedly connected to the end of the three-way pipe 17 away from the first filling pipe 16. The fixed cylinder 19 is a hollow cylindrical structure with a through warning rod 21 slidably connected inside. One end of the warning rod 21 extends into the interior of the fixed cylinder 19, and the other end extends into the exterior of the fixed cylinder 19. A piston 20 is fixedly connected to the end of the warning rod 21 inside the fixed cylinder 19. The outer diameter of the piston 20 matches the inner diameter of the fixed cylinder 19, allowing it to slide smoothly along the inner wall of the fixed cylinder 19. The piston 20 fits tightly against the inner wall of the fixed cylinder 19, ensuring a tight seal. A spring 22 is fixedly installed between the piston 20 and the inner wall of the fixed cylinder 19 away from the extended end of the warning rod 21. When the spring 22 is in its natural state, it can push the piston 20 against one end of the fixed cylinder 19. At this time, most of the warning rod 21 is located inside the fixed cylinder 19, with only a small portion of the end protruding.

[0030] When the second diaphragm 7 wears down after prolonged use, the medium in the pipeline will seep into the space between the first diaphragm 6 and the second diaphragm 7. Under the pressure of the pipeline, the medium will flow along the guide groove 13 and collect in the annular groove 14. Then, it will enter the first filling tube 16 through the discharge hole 15 and flow into the tee tube 17 through the first filling tube 16. An electronic pressure gauge 18 is fixedly installed at the end of the tee tube 17 away from the fixed cylinder 19. The electronic pressure gauge 18 can sense the pressure change in the tee tube 17 in real time and transmit the pressure change signal to the central control computer. The staff can remotely understand the damage of the second diaphragm 7 through the central control computer. At the same time, the medium entering the tee tube 17 will flow into the fixed cylinder 19 and generate a thrust on the piston 20. When the thrust is greater than the elastic force of the spring 22, it will push the piston 20 and the warning rod 21 to move outward of the fixed cylinder 19. The surface of the warning rod 21 is sprayed with red and yellow paint. After it extends, it can be quickly discovered by the on-site staff to achieve the effect of on-site warning.

[0031] More specifically: a fixing groove 36 is provided on the side of the first diaphragm 6 at the position corresponding to the outer end of the discharge hole 15. An interlocking seat 37 is fixedly installed in the fixing groove 36. The two can be fixed by glue or heat fusion. The center of the interlocking seat 37 has a shaft hole 38 for the first filling tube 16 to pass through. The inner and outer ends of the interlocking seat 37 are respectively provided with a liquid inlet groove 39 and a docking groove 40. The side of the first filling tube 16 is provided with at least one liquid inlet hole 41 that communicates with the liquid inlet groove 39. The end of the three-way pipe 17 near the first filling tube 16 is provided with a docking protrusion 42. The docking protrusion 42 is inserted into the docking groove 40, and the outer circular surface of the docking protrusion 42 is provided with a first sealing ring 43 for forming a sealing fit with the inner circular surface of the docking groove 40. The interlocking seat 37 is also provided with at least one set of interlocking components 44 for cooperating with the docking protrusion 42. The interlocking components 44 include a locking rod 45, an interlocking spring 46, and an inner hexagon. The locking rod 45 is movably disposed in the guide hole 48. The locking rod 45 has a guide flange 49 extending outwards from its center. The outer surface of the guide flange 49 fits against the inner surface of the guide hole 48. The inner end of the liquid inlet groove 39 has a flow hole 50 that communicates with the space at the outer end of the guide flange 49 corresponding to the guide hole 48. The internal hexagonal screw plug 47 has threads. The guide hole 48 is connected to the outer end to limit the outer stroke of the locking rod 45. The inner end of the guide hole 48 is provided with a limiting flange 51 to limit the inner stroke of the guide flange 49. The interlocking spring 46 is sandwiched between the guide flange 49 and the limiting flange 51. The outer circular surface of the mating protrusion 42 is provided with an annular locking groove 52. When the locking rod 45 moves along the axial direction of the guide hole 48, it has an unlocked state where the inner end is disengaged from the annular locking groove 52 and a locked state where the inner end is inserted into the annular locking groove 52.

[0032] When the medium enters the first filling tube 16, a portion of the medium will be diverted through the inlet hole 41 into the inlet tank 39, and then enter the guide hole 48 through the overflow hole 50. The medium pressure pushes the locking rod 45 inward, causing it to insert into the annular locking groove 52, thereby locking the mating protrusion 42 onto the interlocking seat 37. This prevents the tee pipe 17 from accidentally disengaging even if the second diaphragm 7 is damaged and the upstream medium pressure remains, thus avoiding safety accidents under high pressure. When the upstream valve is closed, the locking rod 45 is reset by the interlocking spring 46, and the inner end of the locking rod 45 disengages from the annular locking groove 52, releasing the lock on the mating protrusion 42. At this time, the operator can freely pull out the first filling tube 16 and the tee pipe 17.

[0033] The bottom of the fixed cylinder 19 is fixedly connected to a pressure relief pipe 23. Under normal conditions, the pressure relief pipe 23 is not connected to the tee pipe 17. Only when the piston 20 moves to the other side of the pressure relief pipe 23 will the pressure relief pipe 23 be connected to the tee pipe 17. At this time, the infiltrated medium will be discharged through the pressure relief pipe 23 to avoid excessive pressure in the fixed cylinder 19 and damage to the components. The bottom of the pressure relief pipe 23 is connected to a collection cylinder 24 by a threaded connection. The collection cylinder 24 is made of transparent material. The staff can directly observe the amount and state of the discharged medium through the transparent collection cylinder 24 to further judge the degree of damage to the second diaphragm 7. At the same time, the collection cylinder 24 can collect the discharged medium to avoid medium pollution of the environment. The threaded connection also facilitates the disassembly and cleaning of the collection cylinder 24.

[0034] More specifically: the collecting cylinder 24 includes a cylinder body 53 and a bottom cover 54 fixedly installed at the lower end of the cylinder body 53. The two can be fixed by glue, threaded connection or interference fit. The bottom cover 54 has a pressure stabilizing hole 55. The upper inlet of the cylinder body 53 is threaded to the pressure relief pipe 23. A floating piston 56 is axially movable inside the cylinder body 53. The outer surface of the floating piston 56 is provided with a second sealing ring 57 for sealing with the inner surface of the cylinder body 53. A return spring 58 is sandwiched between the floating piston 56 and the bottom cover 54. A guide rod 59 is provided at the bottom of the floating piston 56. A guide hole 60 is provided on the bottom cover 54 for the guide rod 59 to pass through. The guide rod 59 is threaded at a position corresponding to the lower part of the bottom cover 54. A limiting nut 61 is connected to the bottom cover 54 to limit the upper stroke of the guide rod 59. The upper end of the floating piston 56 is provided with a drainage channel 62 that extends to the lower end of the guide rod 59. The lower end of the guide rod 59 is provided with an opening and closing groove 63 that communicates with the drainage channel 62. A conical sealing surface 64 is provided between the drainage channel 62 and the opening and closing groove 63. The side of the guide rod 59 is provided with a drainage hole 65 that communicates with the opening and closing groove 63. An internal hexagonal headstock adjusting screw 66 is internally threaded into the opening and closing groove 63. The upper end of the internal hexagonal headstock adjusting screw 66 is provided with an opening and closing ball 67. When the internal hexagonal headstock adjusting screw 66 is tightened, the internal hexagonal headstock adjusting screw 66 drives the opening and closing ball 67 to move upward and press against the conical sealing surface 64, thus closing the drainage channel 62.

[0035] When the medium enters the inner cavity of the cylinder 53, as the amount of medium entering increases, the floating piston 56 moves downward until it abuts against the bottom cover 54. At this time, the limiting nut 61 is rotated to abut against the bottom of the bottom cover 54, fixing the guide rod 59 and preventing backflow of the medium. After replacing the second diaphragm 7, the internal hexagonal adjusting screw 66 is loosened, causing the opening and closing ball 67 to disengage from the conical sealing surface 64. The medium in the inner cavity of the cylinder 53 enters the opening and closing groove 63 through the drain channel 62 and is discharged through the drain hole 65. After the medium is discharged, the internal hexagonal adjusting screw 66 is tightened, causing the opening and closing ball 67 to move upward and press against the conical sealing surface 64, closing the drain channel 62. At the same time, the limiting nut 61 is rotated to move downward relative to the guide rod 59, and the floating piston 56 slowly moves upward under the action of the return spring 58 until it returns to its original position. This structure can achieve slow discharge of the medium and avoid the occurrence of high-pressure jetting of the internal medium due to the removal of the entire collection cylinder 24.

[0036] The drive unit is located on the top of the valve cover 2 and is used to drive the valve disc 5 to move up and down, thereby causing the first diaphragm 6 and the second diaphragm 7 to deform, thus realizing the on / off control of the pipeline. The drive unit includes a screw 8 and a slot 10. The screw 8 is threaded through the top of the valve cover 2. The connection between the screw 8 and the valve cover 2 is sealed to prevent the medium from leaking from the thread gap. An annular limiting groove 9 is machined on the circumferential surface of the screw 8 near the bottom. The limiting groove 9 is arranged along the circumferential direction of the screw 8. An open slot 10 is machined on one side of the valve disc 5. The shape of the slot 10 matches the limiting groove 9. The screw 8 is inserted and engaged with the slot 10 through the limiting groove 9, so that when the screw 8 rotates, it can drive the valve disc 5 to move up and down, while preventing the valve disc 5 from rotating with the screw 8, ensuring that the valve disc 5 slides smoothly along the slide 4.

[0037] The top of the screw 8 is integrally formed with a square post 11. A knob 3 is circumferentially slidably fitted onto the square post 11. The knob 3 has a square through hole that matches the square post 11, allowing the knob 3 to slide up and down along the square post 11 and rotate with it. A top cap 12 is threaded onto the top of the square post 11. The diameter of the top cap 12 is larger than the diameter of the square through hole of the knob 3, which limits and fixes the knob 3, preventing it from falling off the square post 11. During use... The operator rotates knob 3, which drives screw 8 to rotate via square post 11. Screw 8 moves up and down along valve cover 2 under the action of the thread, which in turn drives valve disc 5 to move up and down along slide 4. When valve disc 5 moves, it will cause the first diaphragm 6 and the second diaphragm 7 to undergo elastic deformation. When the sealing structure at the bottom of the second diaphragm 7 abuts against the middle of valve body 1, the pipeline can be closed. Conversely, when valve disc 5 moves upward, causing the second diaphragm 7 to separate from the middle of valve body 1, the pipeline can be opened to allow the medium to flow.

[0038] In another embodiment: refer to Appendix Figures 1-7 A corrosion-resistant passivated diaphragm valve, the structure of which is basically the same as that of the aforementioned embodiments, the difference being: The bottom of the second diaphragm 7 is integrally formed with a main sealing strip 25, a middle sealing strip 26 and a side sealing strip 27. All three can undergo elastic deformation under pressure. The main sealing strip 25 is located on the side close to the medium entering the valve body 1, and its width is greater than that of the middle sealing strip 26 and the side sealing strip 27. As the main sealing structure, the main sealing strip 25 can effectively block the flow of the medium and ensure the sealing performance when the pipeline is closed.

[0039] One side of the central sealing strip 26 has a through perforation 28, which is cross-shaped. The end wall of the perforation 28 away from the medium entry is in a close fit, which can block the passage of low-pressure medium under normal conditions. The other end of the perforation 28 is open, which facilitates the entry of medium. One side of the second diaphragm 7 also has a through connecting hole 29. A second filling tube 30 is fixedly connected in the connecting hole 29. One end of the tube is fixed in the connecting hole 29, and the other end extends to the outside of the second diaphragm 7. The second filling tube 30 has an L-shaped structure. A bottom cylinder 31 is fixedly connected to the top of the tube. A top cover 32 is fixedly connected to the top of the bottom cylinder 31. An elastic sheet 33 is clamped and fixed between the top cover 32 and the bottom cylinder 31. The elastic sheet 33 can deform under the thrust of the medium and then return to its original position under its own elastic force. The top of the top cover 32 is inverted cone-shaped, which facilitates the collection of medium and entry into the display tube 34. A transparent display tube 34 is fixedly connected to the top of the top cover 32. The display tube 34 is connected to the inside of the top cover 32, which can intuitively display the changes in the internal liquid level.

[0040] The top cover 32 and the display tube 34 are filled with water. A float 35 is placed inside the display tube 34. The float 35 floats on the water surface and moves up and down with changes in the liquid level. When the main sealing strip 25 fails to seal after prolonged use, the medium in the pipeline will first seep into one side of the middle sealing strip 26. As the leakage increases, the pressure on one side of the middle sealing strip 26 will gradually increase. When the pressure reaches a certain value, the medium will push open the end of the cross-shaped perforations 28 that are in contact with each other, and then enter one side of the side sealing strip 27. Subsequently, the bottom of the side sealing strip 27 undergoes elastic deformation under the pressure of the medium, thus... The accumulated medium is discharged. This process causes irregular and repeated changes in the cavity pressure between the main sealing strip 25 and the side sealing strip 27. Some of the medium will enter the second filling tube 30 through the connecting hole 29, and then enter the bottom cylinder 31 through the second filling tube 30. This repeatedly pushes up the elastic plate 33. The repeated deformation of the elastic plate 33 will cause irregular changes in the liquid level in the top cover 32 and the display tube 34. The float 35 will move up and down with the changes in liquid level. By observing the movement of the float 35 in the display tube 34, the staff can easily determine whether the pipeline is leaking and take timely measures.

[0041] The usage process and working principle of the technical solution of this invention are as follows: In this application, the first diaphragm 6 and the second diaphragm 7 are located between the valve body 1 and the valve cover 2. The valve cover 2 is fixed to clamp the first diaphragm 6 and the second diaphragm 7 and seal the valve body 1 and the valve cover 2. By rotating the knob 3 to rotate the screw 8, the screw 8 drives the valve disc 5 to move. The valve disc 5 drives the first diaphragm 6 and the second diaphragm 7 to deform. When the main sealing strip 25, the middle sealing strip 26 and the side sealing strip 27 at the bottom of the second diaphragm 7 abut against the middle of the valve body 1, the pipeline is closed. Otherwise, the pipeline is opened. When the second diaphragm 7 wears out after prolonged use, the medium enters between the first diaphragm 6 and the second diaphragm 7. Under the pressure of the pipeline, the medium enters the discharge hole 15 through the guide groove 13 and the annular groove 14, and then enters the three-way pipe 17 through the first filling pipe 16. The electronic pressure gauge 18 at one end of the three-way pipe 17 senses the pressure change and transmits the pressure change to the central control computer for easy understanding by the staff. At the same time, the pressure is transmitted to the fixed cylinder 19 and pushes the piston 20 and the warning rod 21 to move. The warning rod 21 is painted with red and yellow paint, which makes it easy for on-site personnel to see after it is extended. When the pressure relief pipe 23 is connected to the three-way pipe 17, the medium is discharged. In one embodiment, the medium is collected by the collection cylinder 24. When the main sealing strip 25 fails after prolonged use, the medium first enters one side of the middle sealing strip 26. As the leakage increases and the pressure rises, the medium pushes open one end of the cross-shaped perforation 28 and then enters one side of the side sealing strip 27. Subsequently, the bottom of the side sealing strip 27 undergoes elastic deformation, thereby discharging the accumulated medium. This causes irregular and repeated changes in the cavity pressure between the main sealing strip 25 and the side sealing strip 27. After the medium enters the bottom cylinder 31, it repeatedly pushes up the elastic plate 33, thereby causing changes in the liquid level in the display tube 34. By moving the float ball 35, it is possible for staff to easily understand whether a leak has occurred in the pipeline.

[0042] It should be noted that in the description of this specification, descriptions such as "first" and "second" are only used to distinguish the features and do not have any actual order or directional meaning. This application is not limited to this.

[0043] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, 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.

[0044] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A corrosion-resistant passivated diaphragm valve, characterized in that, include: A valve body (1) is provided with a valve cover (2) on the top of the valve body (1). A pressure cap (201) is provided around the circumference of the valve cover (2). The pressure cap (201) is threadedly connected to the valve body (1). A clearance port (101) is provided on one side of the valve body (1). A slide rail (4) is provided on both sides of the valve cover (2). A valve disc (5) is slidably connected between the slide rails (4). A first diaphragm (6) is threadedly connected to the bottom of the valve disc (5). A second diaphragm (7) is threadedly connected to the bottom of the first diaphragm (6). The first diaphragm (6) and the second diaphragm (7) have the same length and width and are provided between the valve body (1) and the valve cover (2). The bottom of the first diaphragm (6) is provided with an annular groove (14) and a plurality of guide grooves (13). The guide grooves (13) are distributed in an umbrella shape. The annular groove (14) is connected to the plurality of guide grooves (13). A discharge hole (15) connected to the annular groove (14) is provided on one side of the first diaphragm (6). A warning section is provided on one side of the first diaphragm (6) to provide a warning in case the second diaphragm (7) is damaged; The drive unit is located on the top of the valve cover (2) and is used to drive the valve disc (5) to move.

2. The corrosion-resistant passivated diaphragm valve as described in claim 1, characterized in that, The warning unit includes a first filling tube (16), which is disposed inside the discharge hole (15) and extends to the outside of the first diaphragm (6). One end of the first filling tube (16) is fixedly connected to a three-way tube (17), and one end of the three-way tube (17) is fixedly connected to a fixed cylinder (19). One end of the fixed cylinder (19) is slidably connected to a through warning rod (21), and one end of the warning rod (21) is fixedly connected to a piston (20). The piston (20) slides against the inner wall of the fixed cylinder (19), and a spring (22) is fixedly installed between the piston (20) and the inner wall of one end of the fixed cylinder (19).

3. The corrosion-resistant passivated diaphragm valve as described in claim 2, characterized in that, The bottom of the fixed cylinder (19) is fixedly connected to a pressure relief pipe (23), and under normal conditions, the pressure relief pipe (23) is not connected to the three-way pipe (17).

4. The corrosion-resistant passivated diaphragm valve as described in claim 3, characterized in that, The bottom of the pressure relief pipe (23) is threaded with a transparent material collection tube (24).

5. The corrosion-resistant passivated diaphragm valve as described in claim 2, characterized in that, An electronic pressure gauge (18) is fixedly installed at the end of the three-way pipe (17) away from the fixed cylinder (19).

6. The corrosion-resistant passivated diaphragm valve as described in claim 1, characterized in that, The drive unit includes a screw (8) and a slot (10). The screw (8) is threaded through the top of the valve cover (2). A ring-shaped limiting groove (9) is provided on the circumference of the screw (8) near the bottom. An open slot (10) is provided on one side of the valve disc (5). The screw (8) is inserted into the slot (10) through the limiting groove (9). A square column (11) is integrally formed on the top of the screw (8). A knob (3) is slidably sleeved on the circumference of the square column (11). A top cap (12) is threaded to the top of the square column (11) for fixing the knob (3).

7. The corrosion-resistant passivated diaphragm valve as described in claim 1, characterized in that, The bottom of the second diaphragm (7) is integrally formed with a main sealing strip (25), a middle sealing strip (26) and a side sealing strip (27). The main sealing strip (25) is close to the side of the medium entering the valve body (1). The width of the middle sealing strip (26) and the side sealing strip (27) is smaller than that of the main sealing strip (25). After the main sealing strip (25) fails to seal, the bottom of the side sealing strip (27) undergoes elastic deformation under pressure.

8. The corrosion-resistant passivated diaphragm valve as described in claim 7, characterized in that, One side of the sealing strip (26) is provided with a through hole (28). The through hole (28) is cross-shaped and the end wall away from the medium entry is in a state of mutual contact. The other end of the through hole (28) is open. One side of the second diaphragm (7) is provided with a through connecting hole (29). A second filling tube (30) is fixedly connected in the connecting hole (29). The second filling tube (30) extends to the outside of the second diaphragm (7). The second filling tube (30) is L-shaped and the top is fixedly connected to a bottom cylinder (31). The top of the bottom cylinder (31) is fixedly connected to a top cover (32). An elastic sheet (33) is clamped and fixed between the top cover (32) and the bottom cylinder (31). The top of the top cover (32) is inverted cone-shaped and the top is fixedly connected to a transparent display tube (34).

9. The corrosion-resistant passivated diaphragm valve as described in claim 8, characterized in that, Water is provided inside the top cover (32) and the display tube (34), and a float (35) is placed inside the display tube (34).

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