Single call valve facilitating online maintenance

Abstract

The application discloses a single call valve convenient for online maintenance, which comprises a valve body, a valve seat, a valve disc, a valve cover, a spring mechanism and a jacking rod, the valve seat is installed in the inner cavity of the valve body, the valve cover is installed on the upper end of the valve body, the spring mechanism is arranged in the valve cover, one end of the jacking rod is connected with the spring mechanism, the other end of the jacking rod is abutted with the upper end of the valve disc, and the valve disc is pressed on the valve seat; the lower end of the valve cover is detachably provided with a sealing plate, so that the spring mechanism is limited in the inner cavity of the valve cover, and a through hole for the jacking rod to pass through is arranged in the middle of the sealing plate; further comprising a safety device, when the valve cover, the spring mechanism and the sealing plate are separated from the valve body, the safety device locks the valve disc on the valve seat. The valve cover and the spring mechanism are integrated into one whole body, the whole module can be disassembled, the traditional disassembling mode is not needed, the situation that the spring force is not accurate due to disassembling the spring in the process of assembling and after-sales is avoided, and the maintenance operation in the later period is greatly facilitated.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a single-call valve that is easy to maintain online. Background Technology

[0002] A single-vent valve is a one-way venting device used in industrial applications for pressure control of storage tanks. It is mainly used in fixed-roof storage tanks in industries such as petroleum, chemical, and metallurgy. The single-vent valve controls the positive pressure of the tank venting through the weight of the valve disc or a spring limit. When the pressure inside the tank exceeds a set value, it automatically releases gas; it does not activate under negative pressure. It functions to maintain tank pressure balance, reduce media evaporation losses, and prevent overpressure bulging.

[0003] During long-term use, single-call valves may develop scratches and defects on the valve disc and cutting edge sealing surfaces due to crystals or impurities in the tank medium or frequent opening, resulting in an inability to achieve effective sealing. Therefore, it is necessary to rework the sealing surfaces and cutting edge positions.

[0004] In traditional single-call valves, the valve cover and spring structure need to be removed from top to bottom. The sealing surface can only be repaired after the spring is removed. However, when it is reinstalled, the spring pressure will deviate, and it is impossible to test it on site. This results in inaccurate opening pressure of the single-call valve, which is not conducive to later maintenance operations.

[0005] Therefore, it is necessary to improve the structure to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a single-call valve that is easy to maintain online. This invention integrates the valve cover and spring structure into a whole, allowing the entire module to be disassembled without the need for the traditional method of disassembling one by one. This avoids the situation where the spring force is inaccurate due to disassembly of the spring during assembly and after-sales service, and greatly facilitates the later maintenance operation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a single-call valve that is easy to maintain online, comprising a valve body, a valve seat, a valve disc, a valve cover, a spring mechanism, and a push rod. The valve seat is installed in the inner cavity of the valve body, the valve cover is installed on the upper end of the valve body, the spring mechanism is disposed inside the valve cover, one end of the push rod is connected to the spring mechanism, and the other end of the push rod abuts against the upper end of the valve disc, causing the valve disc to be pressed tightly onto the valve seat; a sealing plate is detachably installed on the lower end of the valve cover, so that the spring mechanism is restricted in the inner cavity of the valve cover, and the sealing plate has a through hole in the middle for the push rod to pass through; it also includes a safety device, which locks the valve disc onto the valve seat when the valve cover, spring mechanism, and sealing plate are removed from the valve body.

[0008] By adopting the above technical solution, a removable sealing plate is set at the lower end of the valve cover, which completely restricts the spring mechanism in the inner cavity of the valve cover. Therefore, when repairing the valve disc sealing surface or valve seat sealing surface, it is not necessary to disassemble the spring mechanism, avoiding the need to readjust the spring preload. This also avoids the situation where the spring force is inaccurate due to spring disassembly during assembly and after-sales service, ensuring the accuracy of the valve opening pressure and greatly facilitating subsequent maintenance operations.

[0009] The present invention is further configured such that the valve disc is connected to the bottom of the valve cover by a plurality of locking screws.

[0010] By adopting the above technical solution, the connection method is simple and reliable, and disassembly and assembly are very convenient.

[0011] The present invention is further configured such that the valve cover, the sealing plate and the valve body are connected together by a plurality of fasteners, and the upper and lower ends of the sealing plate are respectively provided with a first positioning recess and a second positioning recess, the lower end of the valve cover is provided with a first positioning protrusion that fits into the first positioning recess, and the upper end of the valve body is provided with a second positioning protrusion that fits into the second positioning recess.

[0012] By adopting the above technical solution and setting a positioning structure as an aid, it is not only convenient to disassemble and assemble the valve cover, sealing plate and valve body, but also to ensure the precise matching and installation of the valve cover, sealing plate and valve body.

[0013] The present invention is further configured such that a first sealing gasket is sandwiched between the first positioning protrusion and the first positioning recess, and a second sealing gasket is sandwiched between the second positioning protrusion and the second positioning recess.

[0014] By adopting the above technical solution, the sealing performance of the positioning connection interface between the valve cover and the sealing plate, and between the sealing plate and the valve body can be effectively guaranteed.

[0015] The present invention is further configured such that a pressure stabilizing hole for connecting the inner cavity of the valve body and the inner cavity of the valve cover is provided through the sealing plate.

[0016] By adopting the above technical solution, the inner cavity of the valve body and the inner cavity of the valve cover are connected together, ensuring that the push rod can move smoothly axially.

[0017] The present invention is further configured such that a guide bushing for fitting around the outer periphery of the top rod is installed in the through hole of the sealing plate.

[0018] By adopting the above technical solution, the guide bushing can not only guide the push rod and improve its axial movement stability, but also avoid direct friction and collision between the push rod and the edge of the through hole.

[0019] The present invention is further configured such that the spring mechanism includes an upper spring seat, a lower spring seat, and a preload spring. The upper spring seat and the lower spring seat are respectively provided with an upper positioning protrusion and a lower positioning protrusion. The preload spring is respectively sleeved on the outer periphery of the upper positioning protrusion and the lower positioning protrusion. The lower end of the upper positioning protrusion is also provided with a support sleeve for positioning the preload spring. The upper end of the push rod is connected to the lower spring seat.

[0020] By adopting the above technical solution, which is the specific structure of the spring mechanism, the upper spring seat and the lower spring seat provide positioning support for both ends of the pre-tensioned spring, thus ensuring the stability of the spring mechanism during movement.

[0021] The invention is further configured such that a positioning block is threadedly connected to the center of the valve disc, the upper end of the positioning block is provided with a positioning groove that cooperates with the lower end of the push rod, a ball is provided in the positioning groove, and the lower end of the push rod extends into the positioning groove and abuts against the ball.

[0022] By adopting the above technical solution, the lower end of the push rod directly engages with the positioning block on the upper end of the valve disc. The engagement structure is simple and the force transmission is accurate. At the same time, the rigid contact between the push rod and the valve disc is optimized into a point contact rolling engagement, which effectively reduces motion friction and improves the accuracy of pressure adjustment.

[0023] The present invention is further configured such that an adjusting screw is threadedly connected to the upper end of the valve cover along the axial direction, and an anti-loosening nut for abutting against the upper end of the valve cover is also threadedly connected to the adjusting screw, and the lower end of the adjusting screw abuts against the upper spring seat.

[0024] By adopting the above technical solution, the axial position of the adjusting screw is adjusted by rotating the adjusting screw, thereby adjusting the initial preload of the spring mechanism and realizing the adjustment of the opening pressure of the single call valve. In addition, the anti-loosening nut can improve the stability of the adjusting screw in the set position and prevent the adjusting screw from loosening during the valve opening and closing process, which would cause the opening pressure of the single call valve to change.

[0025] The present invention is further configured such that a sealing cover for covering the upper end of the adjusting screw is sealed on the upper end of the valve cover.

[0026] By adopting the above technical solution, leakage of internal media to the outside can be avoided, ensuring the sealing of the upper part of the valve cover.

[0027] The invention is further configured such that the safety device includes a connecting seat, a support plate, and multiple locking rods. The valve plate has a mounting groove at its bottom, and the connecting seat is connected to the mounting groove by screws. The support plate is detachably mounted on the bottom of the connecting seat. The valve plate, connecting seat, and support plate are respectively provided with an upper hole, a middle hole, and a lower hole arranged coaxially. A first spring is provided between the positioning block and the valve plate. The bottom of the positioning block has a guide rod passing through the upper hole, middle hole, and lower hole. The lower end of the guide rod has a screw portion, and a limit nut is threaded onto the screw portion. A limit washer is sandwiched between the limit nut and the lower end of the guide rod. When the guide rod moves axially, it has a downward limit position where the positioning block abuts against the upper end of the valve plate and an upward limit position where the limit washer abuts against the upper end of the support plate. The support plate has multiple radially extending guide holes on its periphery, and the guide holes communicate with the lower hole. A spring groove is provided at the outer end of each guide hole, and a guide sleeve is threaded onto the outer end of the spring groove. The locking rod passes through the guide sleeve and the guide hole. Furthermore, the locking rod has a limiting flange on its outer periphery, which is axially movable within a spring groove. A second spring is sandwiched between the outer end of the limiting flange and the inner end of the guide sleeve, causing the locking rod to tend to move inward. The inner surface of the valve seat has an annular locking groove for the locking rod to insert when it moves outward. The guide rod has an annular concave portion on its outer periphery, and a guide cone surface is provided between the lower end of the annular concave portion and the outer periphery of the guide rod. A ball is provided between the locking rod and the guide rod, and the inner end of the guide hole has a limiting feature for the ball. The limiting protrusion edge ensures that the ball can only partially extend into the lower hole; when the guide rod is at the downward limit position, the second spring acts on the locking rod, causing the locking rod to disengage from the annular locking groove, and simultaneously pushing the ball partially into the annular inner recess; when the guide rod is at the upper limit position, the outer circular surface of the guide rod acts on the ball, causing the ball to push the locking rod outward and insert it into the annular locking groove; the upper end of the inner circular surface of the valve seat is also provided with a guide cone surface for acting on the outer end of the locking rod when the valve disc moves downward, pushing the locking rod inward.

[0028] By adopting the above technical solution, the spring mechanism requires regular maintenance, which can prevent the safety device from automatically locking the valve disc on the valve seat when the valve cover, spring mechanism and sealing plate are removed from the valve body. This avoids accidental opening of the upstream valve and high-pressure medium impacting the valve disc, causing the valve disc to be ejected from the valve body at high speed and resulting in a safety accident, thereby improving the safety of valve maintenance. More specifically, when the valve is in normal operation and closed, the spring mechanism acts on the push rod, which in turn acts on the positioning block, pressing the valve disc against the valve seat. This causes the guide rod at the lower end of the positioning block to be in its lower limit position, with the ball bearing embedded in the annular recess of the guide rod. Furthermore, the outer end of the locking rod is disengaged from the annular locking groove on the valve seat. When the upstream medium pressure increases and pushes the valve disc upward, the valve disc can move smoothly upward because the outer end of the locking rod is disengaged from the annular locking groove on the valve seat. When the upstream medium pressure decreases, the valve disc moves downward. At this time, because the force of the push rod is not fully applied to the positioning block, the positioning block will produce a small axial displacement relative to the valve disc, causing the locking rod to move outward a certain distance. When the outer end of the locking rod contacts the guide cone surface on the valve seat, the guide cone surface applies a reaction force to the locking rod. Simultaneously, the push rod pushes the positioning block, causing the guide rod to move downward, thus retracting the locking rod and ensuring that the valve disc can be completely closed. During maintenance, the upstream valve is first closed. When removing the valve cover, spring mechanism, and sealing plate from the valve body, the positioning block loses its downward pressure and, under the action of the first spring, drives the guide rod upward. This causes the guide rod to move to its upper limit position, and the guide rod acts on the ball to push out the locking rod. The outer end of the locking rod is inserted into the annular locking groove of the valve seat, thus locking the valve disc. Even if the upstream valve is accidentally opened, the valve disc will not be blown out by the high-pressure medium, greatly improving the safety of valve maintenance.

[0029] The invention is further configured such that the lower end of the connecting seat is provided with a boss portion, the upper end of the support plate is provided with a connecting sleeve fitted around the outer periphery of the boss portion, the connecting sleeve is provided with a plurality of insertion holes, a locking pin is inserted into the insertion hole, and the inner end of the locking pin extends out of the insertion hole, the outer periphery of the locking pin is provided with a first annular limiting portion, the inner end of the insertion hole is provided with a second annular limiting portion for limiting the first annular limiting portion, the outer end of the insertion hole is threadedly connected with a positioning stud, the inner end of the positioning stud abuts against the outer end of the locking pin, the outer periphery of the boss portion is provided with a plurality of inverted L-shaped grooves, the number of which is equivalent to the number of locking pins, for the corresponding locking pins to slide into, and when the locking pin slides to the inner end of the inverted L-shaped groove, the locking pin and the inverted L-shaped groove are interference fit.

[0030] By adopting the above technical solution, when the support plate is installed on the connecting seat, it only requires "pushing up and rotating" operation, and when disassembling, it only requires "rotating and pulling down", making the disassembly and assembly operations very convenient.

[0031] The invention is further configured such that a rubber pad is fixedly installed on the upper end of the valve disc, and when the guide rod is at the downward limit position, the lower end of the positioning block abuts against the upper end of the rubber pad, an O-ring is embedded in the upper end of the middle hole of the connecting seat, and the upper end of the O-ring abuts against the inner end face of the mounting groove, and the inner circular surface of the O-ring is tightly fitted with the outer circular surface of the guide rod.

[0032] By adopting the above technical solution, the sealing performance between the guide rod and the valve disc can be significantly improved, preventing upstream medium from leaking downstream through the gap between the guide rod and the valve disc when the valve disc is in the closed position. Attached Figure Description

[0033] Figure 1 This is a perspective view of the entire invention;

[0034] Figure 2 This is a cross-sectional view of the entire invention;

[0035] Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle;

[0036] Figure 4 This is a schematic diagram of the connection structure of the valve cover, spring mechanism, sealing plate and top rod of the present invention;

[0037] Figure 5 This is a schematic diagram of the installation structure of the safety device of the present invention;

[0038] Figure 6 This is a schematic diagram of the cooperation structure between the locking rod and the guide post in the safety device of the present invention;

[0039] Figure 7 for Figure 6 Enlarged structural diagram of section B in the middle;

[0040] Figure 8 This is a schematic diagram of the valve seat structure of the present invention;

[0041] Figure 9 This is a schematic diagram of the mating structure between the connecting seat and the support plate of the present invention;

[0042] Figure 10 This is a perspective view of the connector of the present invention.

[0043] In the diagram: 1. Valve body; 2. Valve seat; 3. Valve disc; 4. Valve cover; 5. Spring mechanism; 6. Push rod; 7. Sealing plate; 8. Through hole; 9. Locking screw; 10. Fastener; 11. First positioning recess; 12. Second positioning recess; 13. First positioning protrusion; 14. Second positioning protrusion; 15. First sealing gasket; 16. Second sealing gasket; 17. Pressure stabilizing hole; 18. Guide bushing; 19. Upper spring seat; 20. Lower spring seat; 21. Upper positioning protrusion; 22. Lower positioning protrusion; 23. Support sleeve; 24. Positioning block; 25. Positioning groove; 26. Ball bearing; 27. Adjusting screw; 28. Anti-loosening nut; 29. ​​Sealing cover; 30. Preload spring; 31. Safety device; 32. Connecting seat 33. Support plate; 34. Locking rod; 35. Mounting groove; 36. Upper hole; 37. Middle hole; 38. Lower hole; 39. First spring; 40. Guide rod; 41. Screw part; 42. Limiting nut; 43. Limiting washer; 44. Guide hole; 45. Spring groove; 46. Guide sleeve; 47. Limiting flange; 48. Second spring; 49. Annular inner recess; 50. Guide cone surface; 51. Steel ball; 52. Limiting protrusion; 53. Guide cone surface; 54. Boss part; 55. Connecting sleeve; 56. Insertion hole; 57. Locking post; 58. First annular limiting part; 59. Second annular limiting part; 60. Positioning stud; 61. "Inverted L" shaped groove; 62. Annular locking groove; 63. Rubber pad; 64. O-ring. Detailed Implementation

[0044] 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.

[0045] Example: As attached Figures 1-10The single-call valve shown is easy to maintain online and includes a valve body 1, a valve seat 2, a valve disc 3, a valve cover 4, a spring mechanism 5, and a push rod 6. The valve seat 2 is installed in the inner cavity of the valve body 1, the valve cover 4 is installed on the upper end of the valve body 1, the spring mechanism 5 is disposed in the valve cover 4, one end of the push rod 6 is connected to the spring mechanism 5, and the other end of the push rod 6 abuts against the upper end of the valve disc 3, causing the valve disc 3 to be pressed tightly onto the valve seat 2. A sealing plate 7 is detachably installed on the lower end of the valve cover 4, so that the spring mechanism 5 is restricted in the inner cavity of the valve cover 4. The sealing plate 7 has a through hole 8 in the middle for the push rod 6 to pass through. It also includes a safety device 31, which locks the valve disc 3 onto the valve seat 2 when the valve cover 4, the spring mechanism 5, and the sealing plate 7 are removed from the valve body 1. A removable sealing plate 7 is provided at the lower end of the valve cover 4 to completely confine the spring mechanism 5 within the inner cavity of the valve cover 4. This eliminates the need to disassemble the spring mechanism 5 when repairing the sealing surface of the valve disc 3 or the sealing surface of the valve seat 2, thus avoiding the need to readjust the spring preload. This also prevents the spring force from becoming inaccurate due to spring disassembly during assembly and after-sales service, ensuring the accuracy of the valve opening pressure and greatly facilitating subsequent maintenance operations.

[0046] The valve disc 3 is connected to the bottom of the valve cover 4 by multiple locking screws 9. The locking screws 9 are evenly distributed in a circumferential array and can be hexagonal socket head cap screws. They are installed from bottom to top. The connection method is simple and reliable, and disassembly and assembly are very convenient.

[0047] As attached Figure 2 and attached Figure 3 As shown, the valve cover 4, the sealing plate 7, and the valve body 1 are connected together by multiple fasteners 10. The fasteners 10 can be a combination of studs and nuts. Specifically, a threaded hole is provided at the upper end of the valve body 1, and through holes are provided on the sealing plate 7 and the valve cover 4. The stud passes through the through holes on the valve cover 4 and the sealing plate 7 and is threaded into the threaded hole of the valve body 1. The nut is threaded onto the upper end of the stud and abuts against the valve cover 4. The sealing plate 7 has a first positioning recess 11 and a second positioning recess 12 at its upper and lower ends, respectively. In this embodiment, the first positioning recess 11 and the second positioning recess 12 are annular in shape and are located on the outer circular surface of the sealing plate 7. The lower end of the valve cover 4 has a first positioning protrusion 13 that matches the first positioning recess 11, and the upper end of the valve body 1 has a second positioning protrusion 14 that matches the second positioning recess 12. The positioning structure is set up as an auxiliary, which not only facilitates the disassembly and assembly of the valve cover 4, the sealing plate 7 and the valve body 1, but also ensures the precise matching and installation of the valve cover 4, the sealing plate 7 and the valve body 1.

[0048] As attached Figure 3As shown, a first sealing gasket 15 is sandwiched between the first positioning protrusion 13 and the first positioning recess 11, and a second sealing gasket 16 is sandwiched between the second positioning protrusion 14 and the second positioning recess 12. This design can effectively ensure the sealing performance of the positioning connection interface between the valve cover 4 and the sealing plate 7, and between the sealing plate 7 and the valve body 1.

[0049] As attached Figure 4 As shown, a pressure-stabilizing hole 17 is provided through the sealing plate 7 to connect the inner cavity of the valve body 1 and the inner cavity of the valve cover 4. Connecting the inner cavity of the valve body 1 and the inner cavity of the valve cover 4 together ensures that the push rod 6 can move smoothly axially.

[0050] As attached Figure 4 As shown, a guide sleeve 18 for fitting around the outer periphery of the push rod 6 is installed in the through hole 8 of the sealing plate 7. The guide sleeve 18 can be press-fitted with the through hole 8 or threaded. The guide sleeve 18 not only guides the push rod 6 and improves its axial movement stability, but also avoids direct friction and collision between the push rod 6 and the edge of the through hole 8.

[0051] As attached Figure 4 As shown, the spring mechanism 5 includes an upper spring seat 19, a lower spring seat 20, and a preload spring 30. The upper spring seat 19 and the lower spring seat 20 are respectively provided with an upper positioning protrusion 21 and a lower positioning protrusion 22. The preload spring 30 is respectively sleeved on the outer periphery of the upper positioning protrusion 21 and the lower positioning protrusion 22. The lower end of the upper positioning protrusion 21 is also provided with a support sleeve 23 for positioning the preload spring 30. The support sleeve 23 can be welded to the upper positioning protrusion 21. The upper end of the push rod 6 is connected to the lower spring seat 20. Specifically, the upper end of the push rod 6 has a screw part, and the center of the lower spring seat 20 has a through hole for the screw part to pass through. The screw part is threaded with a locking nut, and the locking nut abuts against the upper end of the lower spring seat 20. There is a limiting step between the screw part and the push rod 6 that abuts against the lower end of the lower spring seat 20. The specific structure of the spring mechanism 5 is as follows: the upper spring seat 19 and the lower spring seat 20 provide positioning support for both ends of the preloaded spring 30, ensuring the stability of the spring mechanism 5 during movement.

[0052] As attached Figure 2As shown, a positioning block 24 is threadedly connected to the center of the valve disc 3. Specifically, a through hole is formed in the center of the valve disc 3, and a stud is located at the lower end of the positioning block 24. The stud passes through the through hole, and a locking nut is threaded onto the stud. The locking nut abuts against the bottom end of the sealing plate 7, thus connecting the positioning block 24 to the sealing plate 7. A positioning groove 25 is formed at the upper end of the positioning block 24, which mates with the lower end of the push rod 6. A ball bearing 26 is disposed within the positioning groove 25, and the lower end of the push rod 6 extends into the positioning groove 25 and abuts against the ball bearing 26. The lower end of the push rod 6 directly mates with the positioning block 24 at the upper end of the valve disc 3. This simple mating structure ensures accurate force transmission. Furthermore, the rigid contact between the push rod 6 and the valve disc 3 is optimized into a point-contact rolling fit, effectively reducing motion friction and improving the accuracy of pressure adjustment.

[0053] As attached Figure 4 As shown, an adjusting screw 27 is threadedly connected to the upper end of the valve cover 4 along the axial direction. Specifically, the upper end of the valve cover 4 has a threaded hole that mates with the adjusting screw 27. The adjusting screw 27 is also threaded with an anti-loosening nut 28 for abutting against the upper end of the valve cover 4. The lower end of the adjusting screw 27 abuts against the upper spring seat 19. More specifically, the upper spring seat 19 has a through hole at its center, and the lower end of the adjusting screw 27 has a positioning pin extending into the through hole. Simultaneously, the position between the adjusting screw 27 and the positioning pin has a limiting step that abuts against the upper end of the upper spring seat 19. By rotating the adjusting screw 27, the axial position of the adjusting screw 27 is adjusted, thereby adjusting the initial preload of the spring mechanism 5 and realizing the adjustment of the single-call valve opening pressure. Furthermore, the anti-loosening nut improves the stability of the adjusting screw 27 in the set position, preventing the adjusting screw 27 from loosening during valve opening and closing, which could cause changes in the single-call valve opening pressure.

[0054] As attached Figure 4 As shown, a sealing cover 29 is installed on the upper end of the valve cover 4 to cover the upper end of the adjusting screw 27. The sealing cover 29 can be threaded to the upper end of the valve cover 4, and a sealing ring or sealing gasket is provided between the two. The sealing cover 29 can prevent the internal medium from leaking to the outside and ensure the sealing of the upper end of the valve cover 4.

[0055] As attached Figures 5-10As shown, the safety device 31 includes a connecting seat 32, a support plate 33, and multiple locking rods 34. The valve plate 3 has a mounting groove 35 at its bottom, and the connecting seat 32 is connected to the mounting groove 35 by screws. The support plate 33 is detachably mounted on the bottom of the connecting seat 32. The valve plate 3, connecting seat 32, and support plate 33 are respectively provided with an upper hole 36, a middle hole 37, and a lower hole 38 arranged coaxially. A first spring 39 is provided between the positioning block 24 and the valve plate 3. The bottom of the positioning block 24 has a guide rod 40 passing through the upper hole 36, the middle hole 37, and the lower hole 38, and the lower end of the guide rod 40 has a screw. Part 41, the screw part 41 is threadedly connected to a limiting nut 42, a limiting washer 43 is sandwiched between the limiting nut 42 and the lower end of the guide rod 40, when the guide rod 40 moves axially, it has a downward limit position where the positioning block 24 abuts against the upper end of the valve disc 3 and an upward limit position where the limiting washer 43 abuts against the upper end of the support disc 33; the support disc 33 has a plurality of radially extending guide holes 44 on its periphery, and the guide holes 44 are connected to the lower hole 38, the outer end of the guide hole 44 is provided with a spring groove 45, the outer end of the spring groove 45 is threadedly connected to a guide sleeve 46, the locking rod 34 passes through the guide sleeve 46 and the guide hole 44, and Furthermore, the locking rod 34 is provided with a limiting flange 47 on its outer periphery. The limiting flange 47 is axially movable within the spring groove 45. A second spring 48 is sandwiched between the outer end of the limiting flange 47 and the inner end of the guide sleeve 46, causing the locking rod 34 to tend to move inward. The inner circular surface of the valve seat 2 is provided with an annular locking groove 62 for the locking rod 34 to be inserted when it moves outward. The guide rod 40 is provided with an annular concave portion 49 on its outer periphery. A guide cone surface 50 is provided between the lower end of the annular concave portion 49 and the outer periphery of the guide rod 40. A steel ball 51 is provided between the locking rod 34 and the guide rod 40, and the inner end of the guide hole 44 is provided with a counterweight to the steel ball 51. The limiting protrusion 52 ensures that the steel ball 51 can only partially extend into the lower hole 38. When the guide rod 40 is at the downward limit position, the second spring 48 acts on the locking rod 34, causing the locking rod 34 to disengage from the annular locking groove 62, and simultaneously pushing the steel ball 51 partially into the annular inner recess 49. When the guide rod 40 is at the upper limit position, the outer surface of the guide rod 40 acts on the steel ball 51, causing the steel ball 51 to push the locking rod 34 outward and insert it into the annular locking groove 62. The upper end of the inner surface of the valve seat 2 is also provided with a guide cone surface 53 for acting on the outer end of the locking rod 34 when the valve disc 3 moves downward, pushing the locking rod 34 inward.

[0056] The working principle of the safety device is as follows: The spring mechanism 5 requires regular maintenance to prevent the safety device 31 from automatically locking the valve disc 3 onto the valve seat 2 when the valve cover 4, spring mechanism 5, and sealing plate 7 are removed from the valve body 1. This prevents accidental opening of the upstream valve and high-pressure medium impacting the valve disc 3, causing it to be ejected from the valve body 1 at high speed and resulting in a safety accident, thus improving the safety of valve maintenance. More specifically, when the valve is in normal operation and closed, the spring mechanism 5 acts on the push rod 6, which in turn acts on the positioning block 24, pressing the valve disc 3 against the valve seat 2. This causes the guide rod 40 at the lower end of the positioning block 24 to be in its lower limit position, with the steel ball 51 embedded in the annular recess 49 of the guide rod 40. Furthermore, the outer end of the locking rod 34 is disengaged from the annular locking groove 62 on the valve seat 2. When the upstream medium pressure increases and pushes the valve disc 3 upward, the outer end of the locking rod 34 disengages from the annular locking groove 62 on the valve seat 2. In the off-state, the valve disc 3 can move upward smoothly. When the upstream medium pressure decreases, the valve disc 3 moves downward. At this time, since the force of the push rod 6 does not fully act on the positioning block 24, the positioning block 24 will generate a small amount of axial displacement relative to the valve disc 3, causing the locking rod 34 to move outward a certain distance. When the outer end of the locking rod 34 contacts the guide cone surface 53 on the valve seat 2, the guide cone surface 53 applies a reaction force to the locking rod 34. At the same time, the push rod 6 pushes the positioning block 24 to drive the guide rod 40 downward, causing the locking rod 34 to retract and ensuring that the valve disc 3 can be completely closed. During maintenance, the upstream valve is first closed. When the valve cover 4, spring mechanism 5, and sealing plate 7 are removed and the valve body 1 is disassembled, the positioning block 24 loses its downward pressure and drives the guide rod 40 upward under the action of the first spring 39. This causes the guide rod 40 to move to its upper limit position. The guide rod 40 acts on the steel ball 51 to push out the locking rod 34. The outer end of the locking rod 34 is inserted into the annular locking groove 62 of the valve seat 2, thereby locking the valve disc 3. Even if the upstream valve is accidentally opened, the valve disc 3 will not be blown out by the high-pressure medium, which greatly improves the safety of valve maintenance.

[0057] As shown in Annex 9 and Appendix Figure 10As shown, the lower end of the connecting seat 32 is provided with a boss 54, and the upper end of the support plate 33 is provided with a connecting sleeve 55 sleeved around the boss 54. The connecting sleeve 55 has multiple insertion holes 56, and a locking pin 57 is inserted into each insertion hole 56, with the inner end of the locking pin 57 extending out of the insertion hole 56. A first annular limiting part 58 is provided around the locking pin 57, and a second annular limiting part 59 is provided at the inner end of the insertion hole 56 to limit the first annular limiting part 58. A positioning stud 60 is threaded to the outer end of the insertion hole 56. The end of the support plate 54 abuts against the outer end of the locking post 57. The outer periphery of the boss portion 54 is provided with a plurality of inverted L-shaped grooves 61, corresponding to the number of locking posts 57, for the corresponding locking posts 57 to slide into. When the locking post 57 slides to the inner end of the inverted L-shaped groove 61, the locking post 57 and the inverted L-shaped groove 61 are in an interference fit. The inverted L-shaped groove 61 includes a vertical groove and a circumferential arc groove. The vertical groove extends upward from the lower end of the boss portion 54, and the circumferential arc groove extends circumferentially along the outer surface of the boss portion 54, with one end connected to the upper end of the vertical groove and the other end constricted (in an interference fit with the locking post 57). When the support plate 33 is installed on the connecting seat 32, only an "upward + rotation" operation is required; when disassembling, only a "rotation + pull" operation is required, making disassembly and assembly very convenient.

[0058] As attached Figure 5 As shown, a rubber pad 63 is fixedly installed on the upper end of the valve disc 3, which can be connected with glue. When the guide rod 40 is in the downward limit position, the lower end of the positioning block 24 abuts against the upper end of the rubber pad 63. An O-ring 64 is embedded in the upper end of the central hole 37 of the connecting seat 32, and the upper end of the O-ring 64 abuts against the inner end face of the mounting groove 35. The inner circular surface of the O-ring 64 is in close contact with the outer circular surface of the guide rod 40. This can significantly improve the sealing performance between the guide rod 40 and the valve disc 3, preventing upstream media from leaking downstream through the gap between the guide rod 40 and the valve disc 3 when the valve disc 3 is in the closed position.

Claims

1. A single-call valve for easy online maintenance, comprising a valve body (1), a valve seat (2), a valve disc (3), a valve cover (4), a spring mechanism (5), and a push rod (6), wherein the valve seat (2) is installed in the inner cavity of the valve body (1), the valve cover (4) is installed on the upper end of the valve body (1), the spring mechanism (5) is disposed inside the valve cover (4), one end of the push rod (6) is connected to the spring mechanism (5), and the other end of the push rod (6) abuts against the upper end of the valve disc (3), thereby pressing the valve disc (3) onto the valve seat (2); characterized in that: A sealing plate (7) is detachably installed at the lower end of the valve cover (4), so that the spring mechanism (5) is restricted in the inner cavity of the valve cover (4). The sealing plate (7) has a through hole (8) in the middle for the push rod (6) to pass through. It also includes a safety device (31). When the valve cover (4), spring mechanism (5) and sealing plate (7) leave the valve body (1), the safety device (31) locks the valve disc (3) onto the valve seat (2). The safety device (31) includes a connecting seat (32) provided at the bottom of the valve disc (3) and a mounting seat (32) installed on the valve seat (2). The connecting seat (32) has a support plate (33) at the bottom and multiple locking rods (34) that are radially movable on the support plate (33). The valve plate (3) has a guide rod (40) that is linked with the locking rod (34) through the center. The inner circular surface of the valve seat (2) is provided with an annular locking groove (62) for the locking rod (34) to be inserted when it moves outward. When the guide rod (40) moves axially, it drives the locking rod (34) to move radially along the support plate (33), so that the locking rod (34) can be inserted into or removed from the annular locking groove (62).

2. The single-call valve for easy online maintenance according to claim 1, characterized in that: The valve cover (4), the sealing plate (7) and the valve body (1) are connected together by a number of fasteners (10). The sealing plate (7) has a first positioning recess (11) and a second positioning recess (12) at its upper and lower ends, respectively. The valve cover (4) has a first positioning protrusion (13) at its lower end that matches the first positioning recess (11), and the valve body (1) has a second positioning protrusion (14) at its upper end that matches the second positioning recess (12).

3. A single-call valve for easy online maintenance according to claim 2, characterized in that: A first sealing gasket (15) is sandwiched between the first positioning protrusion (13) and the first positioning recess (11), and a second sealing gasket (16) is sandwiched between the second positioning protrusion (14) and the second positioning recess (12).

4. A single-call valve for easy online maintenance according to claim 1, characterized in that: The sealing plate (7) is provided with a pressure stabilizing hole (17) for connecting the inner cavity of the valve body (1) and the inner cavity of the valve cover (4).

5. A single-call valve for easy online maintenance according to claim 1, characterized in that: The spring mechanism (5) includes an upper spring seat (19), a lower spring seat (20), and a preload spring (30). The upper spring seat (19) and the lower spring seat (20) are respectively provided with an upper positioning protrusion (21) and a lower positioning protrusion (22). The preload spring (30) is respectively sleeved on the outer periphery of the upper positioning protrusion (21) and the lower positioning protrusion (22). The lower end of the upper positioning protrusion (21) is also provided with a support sleeve (23) for positioning the preload spring (30). The upper end of the push rod (6) is connected to the lower spring seat (20).

6. A single-call valve for easy online maintenance according to claim 5, characterized in that: The valve disc (3) is also threadedly connected to a positioning block (24). The upper end of the positioning block (24) is provided with a positioning groove (25) that cooperates with the lower end of the push rod (6). A ball (26) is provided in the positioning groove (25). The lower end of the push rod (6) extends into the positioning groove (25) and abuts against the ball (26).

7. A single-call valve for easy online maintenance according to claim 5, characterized in that: The upper end of the valve cover (4) is threaded with an adjusting screw (27) along the axial direction. The adjusting screw (27) is also threaded with an anti-loosening nut (28) for abutting against the upper end of the valve cover (4). The lower end of the adjusting screw (27) abuts against the upper spring seat (19).

8. A single-call valve for easy online maintenance according to claim 6, characterized in that: The valve disc (3) has a mounting groove (35) at its bottom. The connecting seat (32) is connected to the mounting groove (35) by screws. The support plate (33) is detachably installed at the bottom of the connecting seat (32). The valve disc (3), the connecting seat (32), and the support plate (33) are respectively provided with an upper hole (36), a middle hole (37), and a lower hole (38) arranged coaxially. A first spring (39) is provided between the positioning block (24) and the valve disc (3). The guide rod (40) is located at the bottom of the positioning block (24) and passes through the upper hole (36), the middle hole (37), and the lower hole (38). The lower end of the guide rod (40) is provided with a screw part (41). A limit nut (42) is threaded onto the upper part of the guide rod (40). A limit washer (43) is sandwiched between the limit nut (42) and the lower end of the guide rod (40). When the guide rod (40) moves axially, it has a downward limit position where the positioning block (24) abuts against the upper end of the valve disc (3) and an upward limit position where the limit washer (43) abuts against the upper end of the support disc (33). The support disc (33) has multiple radially extending guide holes (44) on its periphery, and the guide holes (44) are connected to the lower hole (38). A spring groove (45) is provided at the outer end of the guide hole (44), and a guide sleeve (46) is threaded onto the outer end of the spring groove (45). The locking rod (34) passes through the guide sleeve (46) and the guide hole (38). 44) Inside, and the outer periphery of the locking rod (34) is provided with a limiting flange (47), the limiting flange (47) is axially movably disposed in the spring groove (45), the outer end of the limiting flange (47) and the inner end of the guide sleeve (46) are sandwiched with a second spring (48), causing the locking rod (34) to have an inward tendency, the outer periphery of the guide rod (40) is provided with an annular inner concave portion (49), the lower end of the annular inner concave portion (49) and the outer periphery of the guide rod (40) are provided with a guide cone surface (50), the locking rod (34) and the guide rod (40) are provided with a steel ball (51), and the inner end of the guide hole (44) is provided with a limiting protrusion (52) that limits the steel ball (51), so that the steel ball (51) 1) It can only be partially inserted into the lower hole (38); when the guide rod (40) is in the downward limit position, the second spring (48) acts on the locking rod (34), causing the locking rod (34) to disengage from the annular locking groove (62), and at the same time, the steel ball (51) is partially pushed into the annular inner recess (49). When the guide rod (40) is in the upper limit position, the outer surface of the guide rod (40) acts on the steel ball (51), causing the steel ball (51) to push the locking rod (34) outward and insert it into the annular locking groove (62); the upper end of the inner surface of the valve seat (2) is also provided with a guide cone surface (53) for acting on the outer end of the locking rod (34) when the valve disc (3) moves downward, pushing the locking rod (34) inward.

9. A single-call valve for easy online maintenance according to claim 8, characterized in that: The lower end of the connecting seat (32) is provided with a boss (54), and the upper end of the support plate (33) is provided with a connecting sleeve (55) fitted around the outer periphery of the boss (54). The connecting sleeve (55) is provided with a plurality of insertion holes (56). A locking pin (57) is inserted into the insertion hole (56), and the inner end of the locking pin (57) extends out of the insertion hole (56). The outer periphery of the locking pin (57) is provided with a first annular limiting part (58), and the inner end of the insertion hole (56) is provided with a function to limit the first annular limiting part (58). The second annular limiting part (59) forms a limiting part. The outer end of the insertion hole (56) is threaded with a positioning stud (60). The inner end of the positioning stud (60) abuts against the outer end of the locking post (57). The outer periphery of the boss part (54) is provided with a plurality of "inverted L" shaped grooves (61) of the same number as the locking post (57) for the corresponding locking post (57) to slide into. When the locking post (57) slides to the inner end of the "inverted L" shaped groove (61), the locking post (57) and the "inverted L" shaped groove (61) are interference fit.

10. A single-call valve for easy online maintenance according to claim 8, characterized in that: A rubber pad (63) is fixedly installed on the upper end of the valve disc (3). When the guide rod (40) is in the downward limit position, the lower end of the positioning block (24) abuts against the upper end of the rubber pad (63). An O-ring (64) is embedded in the upper end of the middle hole (37) of the connecting seat (32), and the upper end of the O-ring (64) abuts against the inner end face of the mounting groove (35). The inner circle surface of the O-ring (64) is tightly fitted with the outer circle surface of the guide rod (40).

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