Diving respirator pressure reducing valve

Abstract

The utility model discloses a pressure reducing valve of a diving respirator, which belongs to the technical field of pressure reducing valves and comprises a valve body, a pressure gauge arranged on the lower side of the front end of the valve body, an oxygen inlet arranged on the lower side of one end of the valve body, a pressure safety device arranged on the upper side of the oxygen inlet and a pressure regulating valve arranged on the upper end of the valve body. According to the utility model, through the arrangement of the filter assembly, the frame and the filter screen are plugged into the oxygen inlet, the convex block at one end of the frame enters the clamping groove of the arc-shaped plate, and then the mounting bolt can be screwed into the mounting hole of the clamping groove to fix the convex block and the frame, so that the pressure regulating valve and the valve body are fixed; the filter screen prevents impurities from entering the oxygen inlet, the mounting bolts are screwed out of the mounting holes, the frame and the filter screen can be moved out of the oxygen inlet through the handle, and the filter screen is convenient to disassemble, assemble and clean by arranging the filter assembly.

Description

Technical Field

[0001] The utility model belongs to the technical field of pressure reducing valves, and particularly relates to a pressure reducing valve for a diving breathing apparatus. Background Technique

[0002] A pressure reducing valve is a valve that reduces the inlet pressure to a required outlet pressure through adjustment and relies on the energy of the medium itself to automatically maintain the stability of the outlet pressure. From the perspective of fluid mechanics, a pressure reducing valve is a throttling element with variable local resistance, that is, by changing the throttling area, the flow rate and the kinetic energy of the fluid are changed, resulting in different pressure losses, so as to achieve the purpose of pressure reduction. Then, relying on the adjustment of the control and regulation system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a certain error range.

[0003] Chinese Patent Application No. 2018221196612 discloses a pressure reducing valve for a diving breathing apparatus, which relates to the technical field of valves. It includes a valve body, a pressure regulating valve, an oxygen inlet, an oxygen outlet, a pressure regulating switch, an air inlet passage, and an air outlet passage. A pressure regulating valve is provided at the upper end of the valve body. An inner cavity is provided in the pressure regulating valve. An oxygen inlet is provided on the valve body. An oxygen outlet is provided on the valve body adjacent to one side of the oxygen inlet. A pressure regulating switch is provided on the valve body on the opposite side of the oxygen outlet. The oxygen inlet is communicated with the inner cavity through the air inlet passage. The inner cavity is communicated with the oxygen outlet through the air outlet passage. The piston rod of the pressure regulating switch is threadedly connected to the valve body. A sealing plug is provided at the front end of the piston rod. The sealing plug is arranged in the air inlet passage. It has a simple structure and low production cost, can reduce high-pressure oxygen to an oxygen pressure suitable for divers to breathe, and can ensure uniform output of oxygen, so that divers can use oxygen more stably and for a longer time when diving.

[0004] The above-mentioned disclosed patent is not convenient for disassembling and cleaning the filter screen in the oxygen inlet. The filter screen is prone to blockage after long-term use, which affects the normal use of the device. At the same time, the original device does not have a protection function for the pressure gauge, and the pressure gauge is easily damaged when it is collided. Content of the Utility Model

[0005] In order to solve the problems raised in the above background technique, the utility model provides a pressure reducing valve for a diving breathing apparatus, which has the characteristic of being convenient for disassembling and cleaning the filter screen in the oxygen inlet.

[0006] To achieve the above object, the present utility model provides the following technical solutions: A pressure reducing valve for a diving breathing apparatus, comprising a valve body. A pressure gauge is provided on the lower side of the front end of the valve body. An oxygen inlet is provided on the lower side of one end of the valve body. A pressure safety device is provided above the oxygen inlet. A pressure regulating valve is provided at the upper end of the valve body. An air inlet passage is provided between the pressure regulating valve and the valve body. An air outlet passage is provided on one side of the air inlet passage. An adjusting mechanism is provided at a position corresponding to the air inlet passage at the rear end of the valve body. A connecting column is provided at the lower end of the valve body. A protective component is provided at a position corresponding to the pressure gauge at the front end of the valve body. A filtering component is provided inside the oxygen inlet.

[0007] Preferably, the filtering component includes a filter net, a frame, an arc-shaped plate, a convex block, a card slot, a handle, mounting bolts, mounting holes and a positioning component. Among them, a filter net is provided inside the oxygen inlet. A frame is provided on the outer side of the filter net. Two arc-shaped plates are provided at positions corresponding to the frame inside the oxygen inlet. Convex blocks are provided on both sides of one end of the frame. A card slot corresponding to the convex block is provided at one end of the arc-shaped plate. The convex block and the arc-shaped plate are connected by mounting bolts. Mounting holes corresponding to the mounting bolts are provided in the card slot. Handles are provided on both sides of the end of the frame away from the convex block. Positioning components are provided on both sides of the end of the frame close to the arc-shaped plate.

[0008] Preferably, the positioning component includes a positioning rod, an arc-shaped convex, a positioning hole and a rubber pad. Among them, positioning rods are provided on both sides of one end of the frame. An arc-shaped convex is provided at the other end of the positioning rod. A positioning hole corresponding to the positioning rod is provided in the arc-shaped plate. A rubber pad is provided on the inner wall of the positioning hole.

[0009] Preferably, after the frame enters the oxygen inlet, the side of the frame is in close contact with the inner wall of the oxygen inlet. Through holes corresponding to the mounting bolts are provided in both the frame and the convex block.

[0010] Preferably, the side of the handle is offset from the inner wall of the oxygen inlet. The rubber pad and the arc-shaped plate are bonded by glue. The convex block and the frame are of a welded integral structure.

[0011] Preferably, the protective component includes a protective plate, insertion rods, fixed seats, slots, fixing bolts, fixing holes and an observation port. Among them, a protective plate is provided at a position corresponding to the pressure gauge on the front side of the valve body. An observation port is provided in the protective plate. A plurality of insertion rods are provided at the end of the protective plate close to the valve body. Fixed seats corresponding to the insertion rods are provided at the front end of the valve body. Slots corresponding to the insertion rods are provided at the front end of the fixed seats. The insertion rods and the fixed seats are connected by fixing bolts. Fixing holes corresponding to the fixing bolts are provided in the insertion rods.

[0012] Preferably, after one end of the insertion rod enters the slot, the side of the insertion rod is in close contact with the inner wall of the slot. Through holes corresponding to the fixing bolts are provided in the fixed seats.

[0013] Preferably, the fixed seat and the valve body are welded by spot welding. The insertion rod and the protection plate are of an integrally welded structure, and the side of the insertion rod is flush with the side of the protection plate.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. By setting the filtering component in the present utility model, the frame and the filter net are inserted into the oxygen inlet. The convex block at one end of the frame enters the card slot of the arc-shaped plate. Then, the installation bolt can be screwed into the installation hole of the card slot to fix the convex block and the frame. The filter net prevents impurities from entering the oxygen inlet. By screwing out the installation bolt from the installation hole, the frame and the filter net can be removed from the oxygen inlet through the handle. By setting the filtering component, it is convenient to disassemble and clean the filter net.

[0016] 2. By setting the protection component in the present utility model, several insertion rods at one end of the protection plate are inserted into the slot of the fixed seat. Then, the fixing bolt can be screwed into the fixing hole of the insertion rod to limit and fix the insertion rod and the protection plate. The pressure gauge can be observed through the observation port on the protection plate. Several insertion rods and the protection plate can protect the pressure gauge. By setting the protection component, the pressure gauge can be protected to avoid being easily damaged by collision. Description of the Drawings

[0017] Figure 1 is a three-dimensional view of the present utility model;

[0018] Figure 2 is a cut-away three-dimensional view of the present utility model;

[0019] Figure 3 is a three-dimensional view of the present utility model when the filter net is installed;

[0020] Figure 4 is a three-dimensional view of the present utility model when the protection plate is installed;

[0021] In the figure: 1. Valve body; 2. Filtering component; 21. Filter net; 22. Frame; 23. Arc-shaped plate; 24. Convex block; 25. Card slot; 26. Handle; 27. Installation bolt; 28. Installation hole; 29. Positioning component; 291. Positioning rod; 292. Arc-shaped convex; 293. Positioning hole; 294. Rubber pad; 3. Protection component; 31. Protection plate; 32. Insertion rod; 33. Fixed seat; 34. Slot; 35. Fixing bolt; 36. Fixing hole; 37. Observation port; 4. Pressure safety device; 5. Oxygen inlet; 6. Connecting column; 7. Pressure gauge; 8. Pressure regulating valve; 9. Adjusting mechanism; 10. Intake passage; 11. Outlet passage. Detailed Embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0023] Embodiment 1

[0024] Please refer to Figures 1-4 , the present utility model provides the following technical solutions: A pressure reducing valve for a diving breathing apparatus, including a valve body 1, a pressure gauge 7 is arranged on the lower side of the front end of the valve body 1, an oxygen inlet 5 is arranged on the lower side of one end of the valve body 1, a pressure safety device 4 is arranged on the upper side of the oxygen inlet 5, a pressure regulating valve 8 is arranged on the upper end of the valve body 1, an air inlet channel 10 is arranged between the pressure regulating valve 8 and the valve body 1, an air outlet channel 11 is arranged on one side of the air inlet channel 10, an adjusting mechanism 9 is arranged at the position corresponding to the air inlet channel 10 at the rear end of the valve body 1, a connecting column 6 is arranged at the lower end of the valve body 1, a protection assembly 3 is arranged at the position corresponding to the pressure gauge 7 at the front end of the valve body 1, and a filtering assembly 2 is arranged inside the oxygen inlet 5.

[0025] Specifically, the filtering assembly 2 includes a filter net 21, a frame 22, an arc plate 23, a convex block 24, a card slot 25, a handle 26, mounting bolts 27, mounting holes 28 and a positioning assembly 29. Among them, a filter net 21 is arranged inside the oxygen inlet 5, a frame 22 is arranged outside the filter net 21, two arc plates 23 are arranged at the positions corresponding to the frame 22 inside the oxygen inlet 5, convex blocks 24 are arranged on both sides of one end of the frame 22, a card slot 25 corresponding to the convex block 24 is arranged at one end of the arc plate 23, the convex block 24 and the arc plate 23 are connected by a mounting bolt 27, a mounting hole 28 corresponding to the mounting bolt 27 is arranged in the card slot 25, handles 26 are arranged on both sides of the end of the frame 22 away from the convex block 24, and a positioning assembly 29 is arranged on both sides of the end of the frame 22 close to the arc plate 23.

[0026] By adopting the above technical solutions, the frame 22 and the filter net 21 are inserted into the oxygen inlet 5, the convex block 24 at one end of the frame 22 enters the card slot 25 of the arc plate 23, and then the mounting bolt 27 can be screwed into the mounting hole 28 of the card slot 25 to fix the convex block 24 and the frame 22. The filter net 21 prevents impurities from entering the oxygen inlet 5. Unscrewing the mounting bolt 27 from the mounting hole 28, the frame 22 and the filter net 21 can be removed from the oxygen inlet 5 through the handle 26. By setting the filtering assembly 2, it is convenient to disassemble, assemble and clean the filter net 21.

[0027] Specifically, the positioning component 29 includes a positioning rod 291, an arc-shaped protrusion 292, a positioning hole 293, and a rubber pad 294. Among them, positioning rods 291 are provided on both sides at one end of the frame 22. An arc-shaped protrusion 292 is provided at the other end of the positioning rod 291. A positioning hole 293 corresponding to the positioning rod 291 is provided in the arc-shaped plate 23, and a rubber pad 294 is provided on the inner wall of the positioning hole 293.

[0028] By adopting the above technical solution, when the filter screen 21 and the frame 22 are installed, the positioning rod 291 at one end of the frame 22 is inserted into the positioning hole 293 of the arc-shaped plate 23 through the arc-shaped protrusion 292, and the rubber pad 294 on the inner wall of the positioning hole 293 is squeezed. By setting the positioning component 29, it can play a positioning role in the installation of the filter screen 21, facilitating the convex block 24 to enter the card slot 25 of the arc-shaped plate 23.

[0029] Specifically, after the frame 22 enters the oxygen inlet 5, the side of the frame 22 is closely attached to the inner wall of the oxygen inlet 5. Through holes corresponding to the mounting bolts 27 are provided in both the frame 22 and the convex block 24.

[0030] By adopting the above technical solution, after the frame 22 enters the oxygen inlet 5, the side of the frame 22 fits more closely to the inner wall of the oxygen inlet 5, and the mounting bolt 27 can pass through the frame 22 and the convex block 24.

[0031] Specifically, the side of the handle 26 is staggered from the inner wall of the oxygen inlet 5. The rubber pad 294 and the arc-shaped plate 23 are bonded by glue, and the convex block 24 and the frame 22 are of a welded integral structure.

[0032] By adopting the above technical solution, the handle 26 will not hit the inner wall of the oxygen inlet 5, and the glue bonding makes the rubber pad 294 not easy to fall off.

[0033] When this embodiment is in use, when the pressure reducing valve of the diving breathing apparatus is in use, the device is installed in a suitable position. The connecting column 6 at the lower end of the valve body 1 is threadedly connected to the bottle mouth of the oxygen cylinder, and the oxygen inlet 5 is connected to the bottle valve of the oxygen cylinder. Oxygen enters the pressure regulating valve 8 through the oxygen inlet 5 and the intake passage 10 to achieve pressure reduction. The intake speed can be adjusted through the adjusting mechanism 9. One end of the outlet passage 11 is connected to the diving breathing apparatus through a hose. The decompressed oxygen is sent into the diving breathing apparatus through the outlet passage 11. By setting the filtering component 2, the frame 22 and the filter net 21 are inserted into the oxygen inlet 5. The convex block 24 at one end of the frame 22 enters the card slot 25 of the arc-shaped plate 23. Then, the mounting bolt 27 can be screwed into the mounting hole 28 of the card slot 25 to fix the convex block 24 and the frame 22. The filter net 21 prevents impurities from entering the oxygen inlet 5. By screwing out the mounting bolt 27 from the mounting hole 28, the frame 22 and the filter net 21 can be removed from the oxygen inlet 5 through the handle 26. By setting the filtering component 2, it is convenient to disassemble, install and clean the filter net 21. By setting the positioning component 29, when the filter net 21 and the frame 22 are installed, the positioning rod 291 at one end of the frame 22 is inserted into the positioning hole 293 of the arc-shaped plate 23 through the arc-shaped convex 292, and the rubber pad 294 on the inner wall of the positioning hole 293 is squeezed. By setting the positioning component 29, it can play a positioning role in the installation of the filter net 21, which is convenient for the convex block 24 to enter the card slot 25 of the arc-shaped plate 23.

[0034] Embodiment 2

[0035] The difference between this embodiment and Embodiment 1 is that: the protection component 3 includes a protection plate 31, a plug rod 32, a fixed seat 33, a slot 34, a fixing bolt 35, a fixing hole 36 and an observation port 37. Among them, a protection plate 31 is arranged at the position corresponding to the pressure gauge 7 on the front side of the valve body 1. An observation port 37 is arranged in the protection plate 31. A plurality of plug rods 32 are arranged at one end of the protection plate 31 close to the valve body 1. A fixed seat 33 is arranged at the position corresponding to the plug rod 32 at the front end of the valve body 1. A slot 34 corresponding to the plug rod 32 is arranged at the front end of the fixed seat 33. The plug rod 32 and the fixed seat 33 are connected by a fixing bolt 35, and a fixing hole 36 corresponding to the fixing bolt 35 is arranged in the plug rod 32.

[0036] By adopting the above technical solution, a plurality of plug rods 32 at one end of the protection plate 31 are inserted into the slot 34 of the fixed seat 33. Then, the fixing bolt 35 can be screwed into the fixing hole 36 of the plug rod 32 to limit and fix the plug rod 32 and the protection plate 31. The pressure gauge 7 can be observed through the observation port 37 on the protection plate 31. A plurality of plug rods 32 and the protection plate 31 can play a protection role for the pressure gauge 7. By setting the protection component 3, the pressure gauge 7 can be protected to avoid being easily damaged by collision.

[0037] Specifically, after one end of the insertion rod 32 enters the slot 34, the side of the insertion rod 32 is in close contact with the inner wall of the slot 34, and through holes corresponding to the fixing bolts 35 are provided in the fixing seat 33.

[0038] By adopting the above technical solution, after one end of the insertion rod 32 enters the slot 34, the insertion rod 32 is more stable in the slot 34, and the fixing bolt 35 can pass through the fixing seat 33 and be screwed into the fixing hole 36 of the insertion rod 32.

[0039] Specifically, the fixing seat 33 and the valve body 1 are welded by spot welding. The insertion rod 32 and the protection plate 31 are of a welded integral structure, and the side of the insertion rod 32 is flush with the side of the protection plate 31.

[0040] By adopting the above technical solution, the spot welding makes the connection between the fixing seat 33 and the valve body 1 more firm, and the side of the insertion rod 32 will not protrude beyond the side of the protection plate 31.

[0041] When this embodiment is in use, by setting the protection component 3, several insertion rods 32 at one end of the protection plate 31 are inserted into the slots 34 of the fixing seat 33. Then, the fixing bolts 35 can be screwed into the fixing holes 36 of the insertion rods 32 to limit and fix the insertion rods 32 and the protection plate 31. The pressure gauge 7 can be observed through the observation port 37 on the protection plate 31. The several insertion rods 32 and the protection plate 31 can protect the pressure gauge 7. By setting the protection component 3, the pressure gauge 7 can be protected to avoid being easily damaged by collision.

[0042] In the present utility model, the structures and working principles of the valve body 1, the pressure safety device 4, the oxygen inlet 5, the connecting column 6, the pressure gauge 7, the pressure regulating valve 8, the adjusting mechanism 9, the air inlet passage 10 and the air outlet passage 11 have been disclosed in a diving breathing apparatus pressure reducing valve with Chinese patent application number 2018221196612. Its working principle is that the connecting column 6 at the lower end of the valve body 1 is threadedly connected to the bottle mouth of the oxygen cylinder, the oxygen inlet 5 is connected to the bottle valve of the oxygen cylinder, oxygen enters the pressure regulating valve 8 through the oxygen inlet 5 and the air inlet passage 10 to achieve pressure reduction. The air inlet speed can be adjusted through the adjusting mechanism 9. One end of the air outlet passage 11 is connected to the diving breathing apparatus through a hose, and the pressure-reduced oxygen is sent into the diving breathing apparatus through the air outlet passage 11.

[0043] Working principle and usage process of the present utility model: When the pressure reducing valve of the diving breathing apparatus is in use, the device is installed at a suitable position. The connecting column 6 at the lower end of the valve body 1 is threadedly connected to the bottle mouth of the oxygen cylinder, and the oxygen inlet 5 is connected to the bottle valve of the oxygen cylinder. Oxygen enters the pressure regulating valve 8 through the oxygen inlet 5 and the intake passage 10 to achieve pressure reduction. The intake speed can be adjusted through the adjusting mechanism 9. One end of the outlet passage 11 is connected to the diving breathing apparatus through a hose. The decompressed oxygen is sent into the diving breathing apparatus through the outlet passage 11. By setting the filtering component 2, the frame 22 and the filter net 21 are inserted into the oxygen inlet 5. The convex block 24 at one end of the frame 22 enters the card slot 25 of the arc-shaped plate 23. Then, the mounting bolt 27 can be screwed into the mounting hole 28 of the card slot 25 to fix the convex block 24 and the frame 22. The filter net 21 prevents impurities from entering the oxygen inlet 5. By screwing out the mounting bolt 27 from the mounting hole 28, the frame 22 and the filter net 21 can be removed from the oxygen inlet 5 through the handle 26. By setting the filtering component 2, it is convenient to disassemble, assemble and clean the filter net 21. By setting the positioning component 29, when the filter net 21 and the frame 22 are installed, the positioning rod 291 at one end of the frame 22 is inserted into the positioning hole 293 of the arc-shaped plate 23 through the arc-shaped convex 292, and the rubber pad 294 on the inner wall of the positioning hole 293 is squeezed. By setting the positioning component 29, it can play a positioning role in the installation of the filter net 21, facilitating the convex block 24 to enter the card slot 25 of the arc-shaped plate 23. By setting the protection component 3, several insertion rods 32 at one end of the protection plate 31 are inserted into the slot 34 of the fixed seat 33. Then, the fixing bolt 35 can be screwed into the fixing hole 36 of the insertion rod 32 to limit and fix the insertion rod 32 and the protection plate 31. The pressure gauge 7 can be observed through the observation port 37 on the protection plate 31. Several insertion rods 32 and the protection plate 31 can play a protective role for the pressure gauge 7. By setting the protection component 3, the pressure gauge 7 can be protected to avoid being easily damaged by collision.

[0044] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A submersible breathing apparatus pressure reducing valve, comprising a valve body (1), a pressure gauge (7) being arranged at the lower side of the front end of the valve body (1), an oxygen inlet (5) being arranged at the lower side of one end of the valve body (1), a pressure safety device (4) being arranged at the upper side of the oxygen inlet (5), a pressure regulating valve (8) being arranged at the upper end of the valve body (1), an air inlet passage (10) being arranged between the pressure regulating valve (8) and the valve body (1), an air outlet passage (11) being arranged at one side of the air inlet passage (10), an adjusting mechanism (9) being arranged at a position corresponding to the air inlet passage (10) at the rear end of the valve body (1), and a connecting column (6) being arranged at the lower end of the valve body (1), characterized in that: A protection component (3) is arranged at a position corresponding to the pressure gauge (7) at the front end of the valve body (1), and a filter component (2) is arranged inside the oxygen inlet (5).

2. A submersible breathing apparatus pressure reducing valve according to claim 1, characterized in that: The filter assembly (2) comprises a filter screen (21), a frame (22), an arc-shaped plate (23), a protrusion (24), a slot (25), a handle (26), a mounting bolt (27), a mounting hole (28) and a positioning assembly (29), wherein the filter screen (21) is arranged inside the oxygen inlet (5), a frame (22) is arranged outside the filter screen (21), two arc-shaped plates (23) are arranged at positions inside the oxygen inlet (5) corresponding to the frame (22), and the frame (2 2) a protrusion (24) is arranged on both sides of one end, a slot (25) corresponding to the protrusion (24) is arranged on one end of the arc plate (23), the protrusion (24) and the arc plate (23) are connected by a mounting bolt (27), a mounting hole (28) corresponding to the mounting bolt (27) is arranged in the slot (25), a handle (26) is arranged on both sides of the end of the frame (22) away from the protrusion (24), and a positioning assembly (29) is arranged on both sides of the end of the frame (22) close to the arc plate (23).

3. A submersible breathing apparatus pressure reducing valve according to claim 2, characterized in that: The positioning assembly (29) comprises a positioning rod (291), an arc-shaped protrusion (292), a positioning hole (293) and a rubber pad (294), wherein the positioning rod (291) is arranged on both sides of one end of the frame (22), the other end of the positioning rod (291) is arranged with an arc-shaped protrusion (292), a positioning hole (293) corresponding to the positioning rod (291) is arranged in the arc plate (23), and a rubber pad (294) is arranged on the inner wall of the positioning hole (293).

4. A submersible breathing apparatus pressure reducing valve according to claim 2, characterized in that: After the frame (22) enters the oxygen inlet (5), the side of the frame (22) is in close contact with the inner wall of the oxygen inlet (5), and through holes corresponding to the mounting bolts (27) are provided in the frame (22) and the protrusion (24).

5. A submersible breathing apparatus pressure reducing valve according to claim 3, characterized in that: The side of the handle (26) and the inner wall of the oxygen inlet (5) are staggered with each other, the rubber pad (294) and the arc plate (23) are bonded by glue, and the protrusion (24) and the frame (22) are welded into an integrated structure.

6. A submersible breathing apparatus pressure reducing valve according to claim 1, characterized in that: The protection assembly (3) comprises a protection plate (31), an insertion rod (32), a fixing seat (33), a slot (34), a fixing bolt (35), a fixing hole (36) and an observation port (37), wherein a protection plate (31) is arranged at a position corresponding to the pressure gauge (7) on the front side of the valve body (1), an observation port (37) is arranged in the protection plate (31), a plurality of insertion rods (32) are arranged at one end of the protection plate (31) close to the valve body (1), a fixing seat (33) is arranged at a position corresponding to the insertion rod (32) on the front end of the valve body (1), a slot (34) corresponding to the insertion rod (32) is arranged at the front end of the fixing seat (33), the insertion rod (32) and the fixing seat (33) are connected by a fixing bolt (35), and a fixing hole (36) corresponding to the fixing bolt (35) is arranged in the insertion rod (32).

7. A submersible breathing apparatus pressure reducing valve according to claim 6, characterized in that: After one end of the insertion rod (32) enters the slot (34), the side of the insertion rod (32) is in close contact with the inner wall of the slot (34), and a through hole corresponding to the fixing bolt (35) is provided in the fixing seat (33).

8. A submersible breathing apparatus pressure reducing valve according to claim 6, characterized in that: The fixing seat (33) and the valve body (1) are spot welded, the insert rod (32) and the protective plate (31) are an integrated welded structure, and the side edge of the insert rod (32) is flush with the side edge of the protective plate (31).

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