A new small pressure relief valve with high protection performance

Abstract

The utility model provides a novel small pressure relief valve of high protection performance belongs to pressure relief valve technical field, this novel small pressure relief valve of high protection performance, including electrical cover, the inner chamber of electrical cover is provided with the threaded coupling valve seat, the top of threaded coupling valve seat is provided with the membrane disc, the right side of electrical cover is provided with the metal waterproof joint, the right side of electrical cover is provided with the wiring mechanism, the surface of electrical cover is provided with the rain cover main part, the top of electrical cover is installed with the nameplate, the top of membrane disc is provided with the sign post, the surface of sign post is provided with micro -control mechanism, the utility model discloses a micro -control mechanism is set up, can alarm micro -switch with nylon switch box, the insulating property is good, the high and low temperature resistance performance is excellent, and the dampproof baffle separates the electrical part such as alarm micro -switch in the inside of electrical cover and outside environment, prevents the water vapor or dust of outside to enter the inside of pressure relief valve, can improve pressure relief valve IP protection level, increases the insulating property of electrical part.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief valve technology, and more specifically, to a novel small pressure relief valve with high protection performance. Background Technology

[0002] Current oil-immersed or airtight power transformers use a special valve, also known as a pressure relief valve, to protect the transformer from deformation or cracking by setting a pressure relief setting value inside the tank to ensure safe pressure tolerance. The pressure protection requirement is that when the transformer's internal temperature rises or an internal fault occurs, the hydraulic or pneumatic pressure inside the tank rapidly increases and exceeds the opening pressure of the pressure relief valve. At this time, the pressure relief valve diaphragm quickly opens and releases the internal pressure of the transformer. Simultaneously, it triggers the alarm switch to send an alarm signal to cut off the power supply, protecting the transformer tank and preventing damage due to excessive pressure.

[0003] Traditional pressure relief valve housings are generally made of castings, which have poor structural strength and corrosion resistance, failing to meet the corrosion resistance requirements of current offshore wind power or photovoltaic transformers. Furthermore, the sealing of alarm switches or wiring components in the electrical part of the pressure relief valve is poor, and the sealing performance of the electrical part does not meet the IP protection level requirements. This poses a risk of short circuits or false alarms at the electrical contacts of the pressure relief valve when the transformer is operating in a humid environment. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a novel small pressure relief valve with high protection performance that overcomes or at least partially solves the above technical problems.

[0005] This utility model is implemented as follows: This utility model provides a novel small pressure relief valve with high protection performance, including an electrical cover, a threaded valve seat in the inner cavity of the electrical cover, a diaphragm plate on the top of the threaded valve seat, a waterproof metal connector on the right side of the electrical cover, a wiring mechanism on the right side of the electrical cover, a rainproof cover body on the surface of the electrical cover, a nameplate on the top of the electrical cover, a marker rod on the top of the diaphragm plate, and a micro-control mechanism on the surface of the marker rod. The micro-control mechanism includes: A nylon switch box, wherein the nylon switch box is fitted onto the surface of the sign post; An alarm micro switch is provided, wherein the alarm micro switch is disposed in the inner cavity of a nylon switch box, and the inner cavity of the nylon switch box is provided with a fixing screw for mounting the alarm micro switch; A moisture-proof baffle is provided at the bottom of the nylon switch box and is threadedly connected to the bottom of the surface of the nylon switch box.

[0006] In a preferred embodiment, a cylindrical compression spring is provided at the bottom of the threaded valve seat, and a spring pressure ring is provided at the bottom of the threaded valve seat. The cylindrical compression spring is located inside the threaded valve seat and the spring pressure ring. A side rubber ring is installed on the surface of the threaded valve seat, and a top rubber ring is provided on the top of the threaded valve seat. A welding stud is welded to the top of the diaphragm disc, and the welding stud penetrates into the inner cavity of the threaded valve seat. A locking nut is installed on the top of the inner cavity of the spring pressure ring, and a clamping nut is provided on the top of the spring pressure ring. Both the locking nut and the clamping nut are threaded onto the surface of the welding stud.

[0007] In a preferred embodiment, the bottom of the threaded connection valve seat is provided with a threaded connection flange, and the inner side of the threaded connection valve seat and the threaded connection flange is provided with a first sealing ring. The surface of the electrical cover is provided with a locking screw, which penetrates the electrical cover and is threadedly connected to the threaded connection valve seat. The bottom of the rainproof cover body is provided with a bolted connection valve seat, the bottom of the bolted connection valve seat is provided with a bolted connection flange, and the four corners of the top of the bolted connection valve seat are provided with clamping bolts.

[0008] In a preferred embodiment, the top of the marker pole is provided with a red identification cap, the top of the red identification cap is provided with a locking support column, the top of the locking support column is provided with a transparent cover, the top of the electrical cover is welded with an upper stud, the surface of the upper stud is threaded with a bushing body, the surface of the bushing body is provided with a bushing clamping screw, and the bottom of the transparent cover is provided with a rainproof cover sealing ring.

[0009] In a preferred embodiment, the wiring mechanism includes a first housing, which is installed on the outside of a metal waterproof connector. A first sealing ring is provided on the inside of the metal waterproof connector and the first housing. A first cover is provided on the surface of the first housing. A first sealing gasket is provided on the inside of the first housing and the first cover. A first clamping screw is provided on the outside of the first housing, and the first clamping screw passes through the first cover and is threadedly connected to the first housing.

[0010] In a preferred embodiment, a first gland is installed at the bottom of the first housing, a second sealing gasket is provided between the first gland and the inner side of the first housing, a first insulating terminal plate is provided in the inner cavity of the first housing, and a first high and low position wiring terminal is welded to the surface of the first insulating terminal plate.

[0011] In a preferred embodiment, the wiring mechanism includes a second housing, which is installed on the outside of a metal waterproof connector. A second sealing ring is provided on the inside of the metal waterproof connector and the second housing. A second cover is provided on the surface of the second housing. A third sealing gasket is provided on the inside of the second housing and the second cover. A second clamping screw is provided on the outside of the second housing, and the second clamping screw passes through the second cover and is threadedly connected to the second housing. A positioning spring is provided in the inner cavity of the second housing. An insulating plate is installed in the inner cavity of the second housing, and a quick-connect terminal is welded to the top of the insulating plate.

[0012] In a preferred embodiment, a second gland is installed at the bottom of the second housing, and a fourth sealing gasket is provided between the second gland and the inner side of the second housing.

[0013] This utility model provides a novel small pressure relief valve with high protection performance, the beneficial effects of which include: 1. By setting a micro-control mechanism, the alarm micro switch uses a nylon switch box with good insulation performance and excellent high and low temperature resistance. The indicator rod passes through the middle of the nylon switch box to trigger the alarm micro switch. The triggering structure is simple and reliable. The moisture-proof baffle isolates the alarm micro switch and other electrical parts inside the electrical enclosure from the external environment, preventing external moisture or dust from entering the pressure relief valve. This can improve the IP protection level of the pressure relief valve and increase the insulation performance of the electrical parts.

[0014] 2. By setting up a wiring mechanism, the pressure relief valve can be installed on the top or side of the transformer tank, ensuring that the outlet faces downwards. This prevents rainwater from entering the wiring mechanism and affecting the internal electrical components, thus improving the protection of the electrical components. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the main cross-sectional structure of Embodiment 1 provided by the present utility model; Figure 2 A side view sectional structural diagram of Embodiment 1 provided for the implementation of this utility model; Figure 3 A schematic diagram of the main cross-sectional structure of Embodiment 2 provided for the implementation of this utility model; Figure 4A schematic diagram of the bolt-connected valve seat installation state provided for an embodiment of this utility model; Figure 5 A three-dimensional structural schematic diagram of the embodiment of this utility model is provided; In the diagram: 1. Spring pressure ring; 2. Cylindrical compression spring; 3. Locking nut; 4. Compression nut; 5. Threaded connection flange; 6. First sealing ring; 7. Threaded connection valve seat; 8. Locking screw; 9. Electrical cover; 10. Side rubber ring; 11. Diaphragm plate; 12. Top rubber ring; 13. Welding stud; 14. Bushing compression screw; 15. Upper stud; 16. Bushing body; 17. Rainproof cover sealing ring; 18. Transparent cover; 19. Locking support column; 20. Metal waterproof connector; 21. First sealing ring; 22. First housing; 23. First housing cover; 24. First high / low position terminal block; 25. First insulating terminal block; 26. 27. First sealing gasket; 28. First clamping screw; 29. ​​Rain cover body; 20. Second sealing gasket; 31. First gland head; 32. Red identification cap; 33. Alarm micro switch; 34. Nylon switch box; 35. Moisture-proof baffle; 36. Marker rod; 37. Fixing screw; 38. Nameplate; 39. Second box body; 40. Insulating board; 41. Positioning snap ring; 42. Quick-connect terminal; 43. Third sealing gasket; 44. Second box cover; 45. Second clamping screw; 46. Bolted connection flange; 47. Bolted connection valve seat; 48. Clamping bolt; 49. Second sealing ring; 50. Second gland head; 51. Fourth sealing gasket. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Reference Figures 1-5This utility model provides a technical solution: a novel small pressure relief valve with high protective performance, including an electrical cover 9. The inner cavity of the electrical cover 9 is provided with a threaded valve seat 7. A diaphragm disc 11 is provided on the top of the threaded valve seat 7. A metal waterproof connector 20 is provided on the right side of the electrical cover 9. A wiring mechanism is provided on the right side of the electrical cover 9. A rainproof cover body 28 is provided on the surface of the electrical cover 9. A nameplate 37 is installed on the top of the electrical cover 9. A marker rod 35 is provided on the top of the diaphragm disc 11. A micro-control mechanism is provided on the surface of the marker rod 35. The electrical cover 9 is made of stainless steel plate through stretching and stamping, with a simple structure, high strength, and strong corrosion resistance. It protects the wiring mechanism and micro-control mechanism. The wiring mechanism allows the pressure relief valve to be installed on the top or side of the transformer housing, ensuring the outlet faces downwards. The triggering of the micro-control mechanism can be tested by pulling the marker rod 35. The rainproof cover body 28 ensures that the pressure relief valve will not experience short circuits or false alarms in humid environments.

[0019] Reference Figures 1-4 In a preferred embodiment, a micro-control mechanism is provided, comprising a nylon switch box 33, an alarm micro switch 32, and a moisture-proof baffle 34. The nylon switch box 33 is sleeved on the surface of the marker rod 35. The alarm micro switch 32 is disposed within the inner cavity of the nylon switch box 33, and a fixing screw 36 is provided within the inner cavity of the nylon switch box 33 for mounting the alarm micro switch 32. The moisture-proof baffle 34 is disposed at the bottom of the nylon switch box 33, and the moisture-proof baffle 34 is attached to the nylon switch box 33. The bottom threaded connection on the surface of box 33 allows for the installation of an alarm micro switch 32 with pre-welded wires inside the nylon switch box 33, which is then secured with fixing screws 36. A marker rod 35 passes through the nylon switch box 33, with the thin end facing upwards and the thick end downwards. The triggering of the alarm micro switch 32 by the marker rod 35 can be tested by sliding it up and down inside the nylon switch box 33. A moisture-proof baffle 34 is installed on the external thread at the lower end of the nylon switch box 33 to prevent splashing rainwater and water vapor from entering the electrical components.

[0020] In addition, the internal thread at the center of the moisture-proof baffle 34 mates with the external thread at the lower end of the nylon switch box 33. It is tightened by the external hexagonal socket on the moisture-proof baffle 34. The outer circle of the moisture-proof baffle 34 and the electrical cover 9 are in clearance fit, with a clearance of 0.5~1mm. Waterproof silicone is evenly applied to this gap. At this time, the moisture-proof baffle 34 isolates the electrical components such as the alarm micro switch 32 inside the electrical cover 9 from the external environment, preventing external moisture or dust from entering the pressure relief valve. This can improve the IP protection level of the pressure relief valve and increase the insulation performance of the electrical components.

[0021] Reference Figures 1-4In a preferred embodiment, a cylindrical compression spring 2 is provided at the bottom of the threaded valve seat 7, and a spring pressure ring 1 is provided at the bottom of the threaded valve seat 7. The cylindrical compression spring 2 is located inside the threaded valve seat 7 and the spring pressure ring 1. A locking nut 3 is installed at the top of the inner cavity of the spring pressure ring 1, and a clamping nut 4 is provided at the top of the spring pressure ring 1. Both the locking nut 3 and the clamping nut 4 are threaded onto the surface of the welding stud 13. The top of the diaphragm disc 11 is welded with a welding stud 13, which penetrates into the inner cavity of the threaded valve seat 7. One end of the cylindrical compression spring 2 abuts against the inner end face of the valve seat cavity, and the other end is pressed by the inner surface of the spring pressure ring 1. The center hole of the spring pressure ring 1 passes through the lower end of the M6 ​​welding stud 13. An M6 reverse clamping nut 4 is screwed on the upper side of the spring pressure ring 1 for positioning the spring pressure ring 1. An M6 non-metallic inlaid locking nut 3 is screwed on the lower side of the spring pressure ring 1 for anti-loosening clamping of the spring pressure ring 1. A side rubber ring 10 is installed on the surface of the threaded connection valve seat 7, and a top rubber ring 12 is provided on the top of the threaded connection valve seat 7. The side rubber ring 10 is installed in the rubber ring groove on the side of the threaded connection valve seat 7. After the diaphragm 11 is welded to the M6 ​​welding stud 13, it is fastened on the top of the threaded connection valve seat 7. The top rubber ring 12 contacts and seals the inner end face of the diaphragm 11. The side rubber ring 10 is clearance-fitted with the inner side of the diaphragm 11.

[0022] Reference Figures 1-3 In a preferred embodiment, a threaded flange 5 is provided at the bottom of the threaded valve seat 7, and a first sealing ring 6 is provided on the inner side of the threaded valve seat 7 and the threaded flange. A locking screw 8 is provided on the surface of the electrical cover 9, and the locking screw 8 passes through the electrical cover 9 and is threadedly connected to the threaded valve seat 7. A bolted valve seat 46 is provided at the bottom of the rain cover body 28, and a bolted flange 45 is provided at the bottom of the bolted valve seat 46. A clamping bolt 47 is provided at each of the four corners of the top of the bolted valve seat 46. The electrical cover 9 is installed on the bolted valve seat 46. The electrical cover 9 and the bolted valve seat 46 are fixed in the groove of the bolted valve seat 46 by three screws evenly distributed along the outer circle of the electrical cover 9, and are installed using the clamping bolt 47.

[0023] Reference Figures 1-4In a preferred embodiment, a red identification cap 31 is provided at the top of the marker rod 35, a locking support post 19 is provided at the top of the red identification cap 31, a transparent cover 18 is provided at the top of the locking support post 19, and an upper stud 15 is welded to the top of the electrical cover 9. The locking support post 19 is yellow. The assembled alarm micro switch 32 and nylon switch box 33 assembly is installed on the internal thread of the upper stud 15 on the inner side of the electrical cover, and the red identification cap 31 is screwed into the upper end of the marker rod 35 protruding from the upper stud 15. The nameplate 37 is glued to the groove on the upper surface of the electrical cover 9, and the nylon switch box 37 is also glued to the groove on the upper surface of the electrical cover 9. A moisture-proof baffle 34 is installed on the lower external thread of the junction box 33 to prevent splashing rainwater and water vapor from entering the electrical parts. A bushing body 16 is installed on the surface thread of the upper stud 15. A bushing clamping screw 14 is provided on the surface of the bushing body 16. A rainproof cover sealing ring 17 is provided at the bottom of the transparent cover 18, which can press the locking support column 19. It is used when the pressure relief valve is transported on the transformer or when the transformer is tested for sealing. When the transformer is put into operation, the locking support column 19 must be removed from the transparent cover 18 before the transparent cover 18 is reinstalled. The bushing body 16 can also provide rain protection.

[0024] Example 1

[0025] Reference Figures 1-2 In a preferred embodiment, the wiring mechanism includes a first housing 22, which is installed on the outside of the metal waterproof connector 20. A first sealing ring 21 is provided on the inner side of the metal waterproof connector 20 and the first housing 22. A first cover 23 is provided on the surface of the first housing 22. A first sealing gasket 26 is provided on the inner side of the first housing 22 and the first cover 23. A first clamping screw 27 is provided on the outer side of the first housing 22, and the first clamping screw 27 passes through the first cover 23 and is threadedly connected to the first housing 22. The first housing 22 is positioned at a 90-degree angle. The top of the transformer housing is adapted to bend the connecting wires through, thus adapting to different installation environments of the transformer housing and providing effective waterproofing. A first gland 30 is installed at the bottom of the first housing 22. A second sealing gasket 29 is provided on the inner side of the first gland 30 and the first housing 22. A first insulating terminal plate 25 is provided in the inner cavity of the first housing 22. A first high and low position wiring terminal 24 is welded to the surface of the first insulating terminal plate 25. The second sealing gasket 29 can prevent the first high position wiring terminal or contact from getting damp and affecting the insulation performance.

[0026] Example 2

[0027] Reference Figures 3-4In a preferred embodiment, the wiring mechanism includes a second housing 38, which is mounted on the outside of the metal waterproof connector 20. A second sealing ring 48 is provided on the inner side of the metal waterproof connector 20 and the second housing 38. A second cover 43 is provided on the surface of the second housing 38. A third sealing gasket 42 is provided on the inner side of the second housing 38 and the second cover 43. A second clamping screw 44 is provided on the outer side of the second housing 38, and the second clamping screw 44 passes through the second cover 43 and is threadedly connected to the second housing 38. A positioning spring 40 is provided inside the second housing 38. An insulating plate 39 is installed in the cavity, and a quick-connect terminal 41 is welded to the top of the insulating plate 39. The second box 38 is designed for direct cable output and can be directly installed on the side of the transformer box for direct cable routing. This prevents rainwater from entering the interior of the second box 38. The installed third sealing gasket 42 prevents rainwater from penetrating the second box 38 and affecting the electrical components. A second gland 49 is installed at the bottom of the second box 38, and a fourth sealing gasket 50 is installed between the second gland 49 and the inside of the second box 38. The fourth sealing gasket 50 provides a seal and improves the sealing effect of the equipment.

[0028] Specifically, the working process or working principle of this new type of high-protection miniature pressure relief valve is as follows: When the pressure relief valve is mounted on top of the transformer: A junction box and an electrical cover 9 sealing ring are installed at one end of the first housing 22 with a rubber ring groove. They are then installed together at the flat-bottomed groove with a central hole punched on the outer circumference of the electrical cover 9. The orientation of the first housing 22 is adjusted to ensure the outlet faces downwards. The junction box is then locked from inside the electrical cover 9 using a metal waterproof connector 20. The wire soldered to the alarm microswitch 32 passes through the inner hole of the metal waterproof connector 20 and enters the first housing 22. The first high / low position terminals 24 are soldered onto the first insulating terminal plate 25. The wires leading out from the alarm micro switch 32 are soldered to the corresponding solder joints. The red cap 31 can be pulled and the on / off state of the alarm micro switch 32 can be tested with a multimeter or indicator light to confirm whether the soldering is correct. After the test is completed, the first insulating terminal plate 25 is fixed inside the first box 22 with two screws. The first sealing gasket 26 is placed on the protrusion on the first box 22. The first box cover 23, which has been screwed into the anti-dislodgement first clamping screw 27, is installed on the first box 22. The gap between the two is filled and sealed by the first box 22 and the first box cover 23 through the first sealing gasket 26. The second sealing gasket 29 is installed on the step at the root of the external thread of the first gland 30 and then screwed into the downward-facing outlet of the first box 22.

[0029] When the pressure relief valve is side-mounted: Insert the third sealing gasket 42 into the end of the second housing 38 with the rubber ring groove, and install it together in the flat-bottomed groove with a central hole punched on the outer circle of the electrical cover 9. Lock it from the inside of the electrical cover 9 with the metal waterproof connector 20 for junction box connection. Pass the wire soldered to the alarm micro switch 32 through the inner hole of the metal waterproof connector 20 for junction box connection and into the second housing 38. Solder the screwless quick-connect terminal 41 to the insulating plate 39, and solder the joints of the insulating plate 39. The corresponding wires leading out from the alarm micro switch 32 are soldered on. The red cap 31 can be pulled and the on / off state of the alarm micro switch 32 can be tested with a multimeter or indicator light to confirm whether the soldering is correct. After the test is completed, the positioning spring 40 is fixed inside the second box 38. The third sealing gasket 42 is placed in the groove of the rubber ring 10 inside the second box cover 43 and screwed on the second box 38. The fourth sealing gasket 50 is installed on the step at the root of the external thread of the second gland 49 and then screwed into the second box cover 43.

[0030] Depending on the usage environment, when installing the rain cover body 28, first screw the bushing body 16 onto the upper stud 15 and tighten it with the bushing clamping screw 14. Then, install the rain cover body 28 onto the bushing body 16. Install the rain cover sealing ring 17 into the large end groove of the transparent cover 18. Place the yellow locking support column 19 on the red cap 31 of the pressure relief valve. Then, screw the transparent cover 18 onto the bushing body 16. At this time, the transparent cover 18 presses down on the yellow locking support column 19, and the yellow locking support column 19 presses down on... The red cap 31 is marked and the pressure is transmitted to the diaphragm 11 through the marker rod 35. Finally, the diaphragm 11 and the top rubber ring 12 are pressed tightly together to ensure that the pressure relief valve does not leak or operate when the transformer is undergoing a sealing test. At this time, the rain cover body 28 is also fixed, which can prevent external rainwater from directly pouring onto the electrical parts of the pressure relief valve, and can effectively increase the IP protection level of the pressure relief valve. Similarly, the same method can be used to configure the rain cover body 28 when the pressure relief valve is mounted on the transformer.

Claims

1. A novel small pressure relief valve with high protective performance, comprising an electrical cover (9), characterized in that: The electrical cover (9) has a threaded valve seat (7) in its inner cavity, a diaphragm plate (11) on the top of the threaded valve seat (7), a metal waterproof connector (20) on the right side of the electrical cover (9), a wiring mechanism on the right side of the electrical cover (9), a rainproof cover body (28) on the surface of the electrical cover (9), a nameplate (37) on the top of the electrical cover (9), a marker rod (35) on the top of the diaphragm plate (11), and a micro-control mechanism on the surface of the marker rod (35). The micro-control mechanism includes: Nylon switch box (33), which is sleeved on the surface of sign post (35); An alarm micro switch (32) is provided in the inner cavity of a nylon switch box (33). A fixing screw (36) is provided in the inner cavity of the nylon switch box (33) for installing the alarm micro switch (32). Moisture-proof baffle (34) is provided at the bottom of the nylon switch box (33) and is threaded to the bottom of the surface of the nylon switch box (33).

2. The novel small pressure relief valve with high protection performance according to claim 1, characterized in that, A cylindrical compression spring (2) is provided at the bottom of the threaded valve seat (7), a spring pressure ring (1) is provided at the bottom of the threaded valve seat (7), and the cylindrical compression spring (2) is provided on the inner side of the threaded valve seat (7) and the spring pressure ring (1). A side rubber ring (10) is installed on the surface of the threaded valve seat (7), and a top rubber ring (12) is provided on the top of the threaded valve seat (7). A welding stud (13) is welded to the top of the diaphragm (11), and the welding stud (13) penetrates into the inner cavity of the threaded valve seat (7). A locking nut (3) is installed on the top of the inner cavity of the spring pressure ring (1), and a clamping nut (4) is provided on the top of the spring pressure ring (1). Both the locking nut (3) and the clamping nut (4) are threaded onto the surface of the welding stud (13).

3. A novel small pressure relief valve with high protection performance according to claim 2, characterized in that, The bottom of the threaded connection valve seat (7) is provided with a threaded connection flange (5), and the inner side of the threaded connection valve seat (7) and the threaded connection flange is provided with a first sealing ring (6). The surface of the electrical cover (9) is provided with a locking screw (8), and the locking screw (8) passes through the electrical cover (9) and is threadedly connected to the threaded connection valve seat (7). The bottom of the rain cover body (28) is provided with a bolted connection valve seat (46), the bottom of the bolted connection valve seat (46) is provided with a bolted connection flange (45), and the four corners of the top of the bolted connection valve seat (46) are provided with clamping bolts (47).

4. A novel small pressure relief valve with high protection performance according to claim 3, characterized in that, The top of the signpost (35) is provided with a red identification cap (31), the top of the red identification cap (31) is provided with a locking support column (19), the top of the locking support column (19) is provided with a transparent cover (18), the top of the electrical cover (9) is welded with an upper stud (15), the surface of the upper stud (15) is threaded with a bushing body (16), the surface of the bushing body (16) is provided with a bushing clamping screw (14), and the bottom of the transparent cover (18) is provided with a rainproof cover sealing ring (17).

5. A novel small pressure relief valve with high protection performance according to claim 4, characterized in that, The wiring mechanism includes a first housing (22), which is installed on the outside of the metal waterproof connector (20). A first sealing ring (21) is provided on the inside of the metal waterproof connector (20) and the first housing (22). A first cover (23) is provided on the surface of the first housing (22). A first sealing gasket (26) is provided on the inside of the first housing (22) and the first cover (23). A first clamping screw (27) is provided on the outside of the first housing (22), and the first clamping screw (27) passes through the first cover (23) and is threadedly connected to the first housing (22).

6. A novel small pressure relief valve with high protection performance according to claim 5, characterized in that, The bottom of the first box (22) is equipped with a first gland (30), and the first gland (30) and the inner side of the first box (22) are provided with a second sealing gasket (29). The inner cavity of the first box (22) is provided with a first insulating terminal plate (25), and the surface of the first insulating terminal plate (25) is welded with a first high and low position wiring terminal (24).

7. A novel small pressure relief valve with high protection performance according to claim 6, characterized in that, The wiring mechanism includes a second housing (38), which is installed on the outside of the metal waterproof connector (20). A second sealing ring (48) is provided on the inside of the metal waterproof connector (20) and the second housing (38). A second cover (43) is provided on the surface of the second housing (38). A third sealing gasket (42) is provided on the inside of the second housing (38) and the second cover (43). A second clamping screw (44) is provided on the outside of the second housing (38), and the second clamping screw (44) passes through the second cover (43) and is threadedly connected to the second housing (38). A positioning spring (40) is provided in the inner cavity of the second housing (38). An insulating plate (39) is installed in the inner cavity of the second housing (38). A quick-connect terminal (41) is welded to the top of the insulating plate (39).

8. A novel small pressure relief valve with high protection performance according to claim 7, characterized in that, The bottom of the second box (38) is equipped with a second gland head (49), and the second gland head (49) and the inner side of the second box (38) are provided with a fourth sealing gasket (50).

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