CN114811136A - A new type of diaphragm pressure reducing valve - Google Patents

Abstract

The application discloses novel diaphragm formula relief pressure valve. This novel diaphragm formula relief pressure valve includes the relief pressure valve body, set up valve rod, seal receptacle, disk seat, diaphragm, positioning seat in the relief pressure valve body, the relief pressure valve body upper end sets up the relief pressure valve gap, set up main spring, spring seat, second adjusting screw in the relief pressure valve gap, main spring's spring force acts on the diaphragm, set up inlet channel and give vent to anger the passageway on the relief pressure valve body, valve rod, seal receptacle surround and form the high-pressure chamber, relief pressure valve body, diaphragm, disk seat, valve rod surround and form the pressure-stabilizing chamber, set up the valve rod shoulder on the valve rod, the valve rod can carry out the up-and-down motion along with the diaphragm.

Description

A new type of diaphragm pressure reducing valve

technical field

The invention relates to the technical field of gas decompression, in particular to a novel diaphragm type decompression valve.

Background technique

In recent years, the hydrogen fuel cell industry has developed rapidly, and the requirements for hydrogen supply system products have become higher and higher. The fuel of the hydrogen fuel cell is stored in the hydrogen storage bottle. The pressure in the ordinary hydrogen storage bottle is 35MPa. Now the hydrogen pressure in the newly developed hydrogen storage bottle reaches 70MPa. When the hydrogen in the hydrogen storage bottle is delivered to the fuel cell for use , the pressure in the hydrogen storage bottle is too high, and the hydrogen in the hydrogen storage bottle needs to be decompressed through a pressure reducing valve. At present, the pressure reducing valves on the market are immature, and there are many problems such as large pressure fluctuations at the back end of the pressure reduction, unstable output pressure and flow, seal leakage, and poor long-term reliability. A novel diaphragm type pressure reducing valve of the present application, through the balanced structure design of the diaphragm and the valve stem, makes the working pressure fluctuation of the pressure reducing valve small, the output flow is stable, the sealing is reliable, the reliability is good, and the product processing technology is relatively Simple and reduces production costs.

SUMMARY OF THE INVENTION

The main purpose of the present application is to provide a new type of diaphragm type pressure reducing valve to solve the problems of large pressure fluctuation, unstable output flow and poor reliability of the existing pressure reducing valve.

In order to achieve the above object, according to one aspect of the present application, a novel diaphragm type pressure reducing valve is provided.

A novel diaphragm type pressure reducing valve according to the present application includes a pressure reducing valve body, wherein a valve stem, a sealing seat, a valve seat, a diaphragm and a positioning seat are arranged in the pressure reducing valve body, and an upper end of the pressure reducing valve body is provided. A pressure-reducing valve cover is provided. The pressure-reducing valve cover is provided with a main spring, a spring upper seat, and a second adjusting screw. The spring force of the main spring acts on the diaphragm, and the second adjusting screw can adjust the size of the spring force. , the pressure reducing valve body is provided with an air inlet channel and an air outlet channel, the pressure reducing valve body, the valve stem and the sealing seat are surrounded to form a high pressure cavity, and the pressure reducing valve body, the diaphragm, the valve seat and the valve stem are surrounded to form a high pressure cavity. Pressure chamber, the valve stem is provided with a valve stem shoulder, the valve stem can move up and down with the diaphragm, high-pressure gas enters the high-pressure chamber from the intake passage, and the valve stem shoulder and the sealing seat A circulation channel is formed, the gas flows from the high-pressure chamber into the pressure-stabilizing chamber, the diaphragm will be subjected to the downward spring force, the upward air pressure and frictional resistance of the pressure-stabilizing chamber, and by adjusting the stroke of the second adjusting screw The spring force can be adjusted. When the spring force is greater than the combined force of air pressure and frictional resistance, the diaphragm drives the valve stem to move downward, the flow area between the valve stem and the sealing seat increases, and the air pressure in the pressure stabilization chamber increases. When the air pressure is greater than the combined force of the spring force and frictional resistance, the diaphragm drives the valve stem to move upward, and the flow area between the valve stem and the sealing seat is reduced, and the stability of The air pressure in the pressure chamber is reduced, so that the diaphragm reaches a balanced state. Through the force balance of the diaphragm, the flow channel area of the shoulder of the valve stem is automatically adjusted, so as to achieve decompression and stable output of high-pressure gas. , the decompressed stable gas is output through the gas outlet channel, and the force on the valve stem is not affected by the pressure value in the high pressure chamber.

Further, a high-pressure seal and a limit block are arranged between the pressure reducing valve body and the valve stem. When the pressure in the high-pressure chamber is relatively high, a retaining ring is arranged at the lower end of the high-pressure seal, and a stopper is arranged on the valve stem. A limit plate and a tightening block are arranged at the lower end, the tightening block fixes the limit plate on the valve stem, an upper limit is set in the pressure reducing valve body, and a tightening cap is arranged at the lower end of the pressure reducing valve body, and the tightening cap is A first adjustment screw is set inside, and the upper end of the first adjustment screw is set with a lower limit, the valve rod moves within the stroke range of the lower limit and the upper limit, and the first adjustment screw can adjust the movement stroke of the valve rod. The upper and lower limit positions can also be placed in other positions that can be limited according to needs.

Further, the diaphragm is fixed between the pressure reducing valve body and the pressure reducing valve cover, the upper end of the diaphragm is provided with an upper pressure plate, and the lower end is provided with a lower pressure plate and a tightening block, and the tightening block tightens the upper pressure plate, the diaphragm and the lower pressure plate. On the positioning seat, the pressure reducing valve cover and the diaphragm are surrounded to form a first cavity, and the diaphragm realizes the sealing between the pressure stabilization cavity and the first cavity. The number of springs includes 1, 2, 3 or more, and the specific number of springs is determined according to the needs of different products.

Further, a positioning pin is arranged between the valve stem and the positioning seat, the diaphragm and the positioning seat can drive the valve stem to move up and down together, and the connection method between the positioning seat and the valve stem also includes a threaded connection, and the piston is connected. Pin connection, retaining ring connection, pin connection, universal joint connection, thrust contact connection, slot connection, interference connection, bolt connection, etc.

Further, the sealing structure form of the valve stem and the sealing seat includes a conical surface seal, a line contact seal, a spherical surface seal, a plane seal and other sealing structures.

Further, the sealing structure between the valve stem and the pressure reducing valve body includes a flood plug seal, a flood plug + retaining ring seal, a sealing ring seal, a sealing ring + retaining ring seal, a sealing ring + double retaining ring seal, etc. A variety of sealing structure forms.

Further, the pressure reducing valve includes a first modified structure, a valve stem body is arranged in the pressure reducing valve body, the sealing seat is located between the pressure reducing valve body and the valve stem body, and a seal is arranged between the valve stem and the valve stem body. A sealing member is arranged between the valve stem body and the pressure reducing valve body, a valve stem spring is arranged between the valve stem and the first adjusting screw, a first channel is arranged on the valve stem body, and the first channel and the intake channel Connected.

Further, the pressure reducing valve includes a second variant structure, the pressure reducing valve body is provided with an air intake joint, a pressure reducing valve core, and a second channel, and a filter element is arranged between the air intake joint and the pressure reducing valve core, A throttle hole is set on the pressure reducing valve core, and an intake hole is set on the intake joint. The high-pressure gas enters from the intake hole, and after being filtered by the filter element, flows through the throttle hole for the first step. stage decompression, the gas after the first stage decompression is passed into the high pressure chamber, the gas is decompressed in the second stage by the circulation gap between the shoulder of the valve stem and the sealing seat, and the decompressed gas flows to the gas outlet channel, and the decompression Multiple pressure reducing valve cores can be set in the pressure valve body according to requirements to realize multi-stage pressure reduction, and a pressure limiting valve is set at the rear end of the second passage. When the pressure in the pressure stabilization chamber is greater than the set value, The gas is discharged from the pressure limiting valve channel, and a stop valve is arranged at the rear end of the gas outlet channel, and the stop valve can close the gas outlet channel.

Further, the pressure reducing valve includes a third modification structure, the lower end of the main spring is provided with a lower spring seat, the lower spring seat is arranged on the upper end of the diaphragm, the lower end of the valve stem is provided with a valve stem spring, the valve stem The valve stem and the diaphragm are kept in contact with the diaphragm under the action of the spring force of the valve stem spring, so that the valve stem and the diaphragm can move upward or downward at the same time.

Description of drawings

The accompanying drawings, which constitute a part of this application, are used to provide a further understanding of the application and make other features, objects and advantages of the application more apparent. The accompanying drawings and descriptions of the exemplary embodiments of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the attached image:

1 is a schematic structural diagram of a diaphragm type pressure reducing valve according to an embodiment of the present application;

2 is a schematic diagram of a closed state of a diaphragm type pressure reducing valve according to an embodiment of the present application;

3 is a schematic structural diagram of a first modification of the diaphragm type pressure reducing valve according to an embodiment of the present application;

4 is a schematic structural diagram of a second modification of a diaphragm type pressure reducing valve according to an embodiment of the present application;

5 is a schematic structural diagram of a third modification of the diaphragm type pressure reducing valve according to an embodiment of the present application;

6 is a schematic diagram of different sealing structures between a valve stem and a sealing seat according to an embodiment of the present application;

7 is a schematic structural diagram of different sealing modes between the pressure reducing valve body and the valve stem according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of different connection modes between the positioning seat and the valve stem according to an embodiment of the present application.

Reference number:

01 pressure reducing valve body; 02 valve stem; 03 sealing seat; 04 valve seat; 05 diaphragm; 06 positioning seat; 07 first adjusting screw; 08 tightening cap; 09 valve stem spring; 10 high pressure seal; 11 retaining ring; 12 limit block; 13 limit plate; 14 tightening block; 15 tightening block; 16 pressure relief valve cover; 17 positioning pin; 18 lower pressure plate; 19 upper pressure plate; 20 tightening bolt; 21 main spring; 22 secondary spring; 23 Spring upper seat; 24 Second adjusting screw; 25 Tightening block; 26 Lower limit; 27 Upper limit; 28 Stem shoulder; 29 Inlet passage; 30 Outlet passage; 31 High pressure chamber; 32 Regulator chamber; 33 Seal; 34 35 Stem body; 36 First channel; 37 Inlet connector; 38 Filter element; 39 Pressure reducing valve core; 40 Orifice; 41 Inlet hole; 42 Second channel; 43 Pressure limiting valve; 44 Globe valve; 45 tightening block; 46 first chamber; 47 spring lower seat.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having", and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientation or positional relationship indicated by "vertical", "horizontal", "horizontal", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the invention and its embodiments, and are not intended to limit the fact that the indicated device, element or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific situations.

Furthermore, the terms "installed", "set up", "provided with", "connected", "connected", "socketed" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediary, or between two devices, elements, or components. internal communication. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIG. 1 and FIG. 2 , the present application relates to a novel diaphragm type pressure reducing valve, including a pressure reducing valve body 01, and a valve stem 02, a sealing seat 03, a valve seat 04, and a diaphragm are arranged in the pressure reducing valve body 01. 05. Positioning seat 06, the upper end of the pressure reducing valve body 01 is provided with a pressure reducing valve cover 16, and the pressure reducing valve cover 16 is provided with a main spring 21, a second spring 22, a spring upper seat 23, a second adjusting screw 24, a main spring 21 and a second adjusting screw 24. The spring force of the second spring 22 acts on the diaphragm 05. The second adjusting screw 24 can adjust the spring force of the main spring 21 and the second spring 22. When the spring force is adjusted to the target value, the second adjusting screw 25 can be adjusted The screw 24 is fixed.

The pressure reducing valve body 01 is provided with an air inlet passage 29 and an air outlet passage 30. The pressure reducing valve body 01, the valve stem 02, and the sealing seat 03 are surrounded to form a high pressure chamber 31. The pressure reducing valve body 01, the diaphragm 05, the valve seat 04, the valve The rod 02 is surrounded to form a pressure-stabilizing chamber 32 , and the valve rod 02 is provided with a valve rod shoulder 28 , and the valve rod 02 can move up and down with the diaphragm 05 .

A high pressure seal 10 and a limit block 12 are arranged between the pressure reducing valve body 01 and the valve stem 02. When the working pressure in the high pressure chamber 31 is high, a retaining ring 11 is arranged at the lower end of the high pressure seal 10, and a stop ring 11 is arranged at the lower end of the valve stem 02. The limiting plate 13 and the tightening block 14 , and the tightening block 14 fixes the limiting plate 13 on the valve stem 02 . The pressure reducing valve body 01 is provided with an upper limit 27, the lower end of the pressure reducing valve body 01 is provided with a tightening cap 08, the inside of the tightening cap 08 is set with a first adjusting screw 07, the upper end of the first adjusting screw 07 is set with a lower limit 26, and the valve stem 02 is at the lower limit 26 and the upper position 27 within the stroke range, the first adjustment screw 07 can adjust the movement stroke size of the valve 02, after the first adjustment screw 07 is adjusted and formed, the first adjustment screw 07 is fixed by the tightening block 15.

When the valve rod 02 moves to the position of the upper limit 27, the valve rod 02 and the sealing seat 03 are in a sealed state, and the position of the upper limit 27 can also be set at other positions that can limit the position. When the valve stem 02 moves to the position of the lower limit position 26, the maximum opening degree between the valve stem shoulder 28 and the sealing seat 03 is reached, and the position of the lower limit position 26 can also be set at other positions that can limit the position.

The diaphragm 05 is fixed between the pressure reducing valve body 01 and the pressure reducing valve cover 16. The upper end of the diaphragm 05 is provided with an upper pressure plate 19, and the lower end is provided with a lower pressure plate 18 and a tightening block 45. The tightening block 45 connects the upper pressure plate 19, diaphragm 05, The lower pressing plate 18 is screwed on the positioning seat 06 . Tighten the bolts 20 to fix the pressure reducing valve body 01 and the pressure reducing valve cover 16 together. The pressure reducing valve cover 16 and the diaphragm 05 are surrounded to form a first chamber 46 , and the diaphragm 05 realizes the sealing between the pressure chamber 32 and the first chamber 46 .

The springs in the first chamber 46 are not limited to the main spring 21 and the second spring 22. The number of springs includes 1, 2, 3 or more, and the specific number of springs is designed and determined according to different product requirements.

When the diaphragm type pressure reducing valve works, the high pressure gas enters the high pressure chamber 31 from the intake passage 29 , and a flow passage is formed between the valve stem shoulder 28 and the sealing seat 03 . The gas flows into the pressure-stabilizing chamber 32 from the high-pressure chamber 31 , the diaphragm 05 will be subjected to the downward spring force, and the upward gas pressure and frictional resistance of the pressure-stabilizing chamber 32 . The spring force can be adjusted to the target value by adjusting the stroke of the second adjusting screw 24 . When the spring force is greater than the combined force of the air pressure and the frictional resistance, the diaphragm 05 drives the valve stem 02 to move downward, the flow area between the valve stem 02 and the sealing seat 03 increases, and the air pressure in the pressure stabilization chamber 32 increases, making the diaphragm 02 larger. Slice 05 reaches an equilibrium state. When the air pressure is greater than the combined force of the spring force and frictional resistance, the diaphragm 05 drives the valve stem 02 to move upward, the flow area between the valve stem 02 and the sealing seat 03 decreases, and the air pressure in the pressure stabilization chamber 32 decreases, making the diaphragm 02 move upward. When the diaphragm 05 reaches a balanced state, the force balance of the diaphragm 05 automatically adjusts the flow channel area of the valve stem shoulder 28, thereby realizing the decompression and stable output of the high-pressure gas. The decompressed stable gas is output through the air outlet channel 30.

The force of the valve stem 02 is not affected by the pressure value in the high pressure chamber 31 .

As shown in FIG. 3, it is the first modified structure of the diaphragm type pressure reducing valve. The valve stem body 35 is arranged in the pressure reducing valve body 01, the sealing seat 03 is located between the pressure reducing valve body 01 and the valve stem body 35, and the valve stem 02 and the valve stem body 35. A seal 33 is arranged between the valve stem bodies 35, a seal 34 is arranged between the valve stem body 35 and the pressure reducing valve body 01, a valve stem spring 09 is arranged between the valve stem 02 and the first adjusting screw 07, and the valve stem body 35 is provided with a first The passage 36, the first passage 36 communicates with the intake passage 29.

As shown in FIG. 4 , it is the second modified structure of the diaphragm type pressure reducing valve. The pressure reducing valve body 01 is provided with an intake joint 37 , a pressure reducing valve core 39 , a second channel 42 , an intake joint 37 and a pressure reducing valve. A filter element 38 is provided between the cores 39 , an orifice 40 is provided on the pressure reducing valve core 39 , and an air intake hole 41 is provided on the intake joint 37 . The high-pressure gas enters from the air inlet hole 41, and after being filtered by the filter element 38, flows through the orifice 40 for first-stage decompression, and the gas after the first-stage decompression passes into the high-pressure chamber 31. The two-stage decompression is performed on the gas in the circulation gap, and the decompressed gas flows to the gas outlet channel 30 . A plurality of pressure reducing valve cores 39 can be arranged in the pressure reducing valve body 01 according to requirements, so as to realize multi-stage pressure reduction. A pressure limiting valve 43 is provided at the rear end of the second passage 42. When the pressure in the pressure stabilization chamber 32 is greater than the set value, the gas is discharged from the pressure limiting valve 43 passage. A cutoff valve 44 is set at the rear end of the gas outlet passage 30, and the cutoff valve 44 can be closed. Air outlet channel 30 .

As shown in FIG. 5, it is the third modified structure of the diaphragm type pressure reducing valve. The lower ends of the main spring 21 and the second spring 22 are provided with a lower spring seat 47, the lower spring seat 47 is arranged on the upper end of the diaphragm 05, and the lower end of the valve stem 02 A valve stem spring 09 is provided, and the valve stem 02 keeps in contact with the diaphragm 05 under the action of the spring force of the valve stem spring 09, so that the valve stem 02 and the diaphragm 05 can move up or down at the same time

As shown in Figure 6, a positioning pin 17 is set between the valve stem 02 and the positioning seat 06. The diaphragm 05 and the positioning seat 06 can drive the valve stem 02 to move up and down together. The connection between the positioning seat 06 and the valve stem 02 is also Including threaded connection, piston pin connection, retaining ring connection, bolt connection, universal joint connection, thrust contact connection, slot connection, interference connection, bolt connection and other ways that can be connected.

As shown in FIG. 7 , the sealing structure of the valve stem 02 and the sealing seat 03 includes a conical surface seal, a line contact seal, a spherical surface seal, a plane seal and other sealing structures.

As shown in Figure 8, the sealing structure between the valve stem 02 and the pressure reducing valve body 01 includes flood plug seal, flood plug + retaining ring seal, sealing ring seal, sealing ring + retaining ring seal, sealing ring + double block Ring seal and other sealing structures. The sealing ring, retaining ring, plug structure and other seals can be placed on the valve stem 02 to seal the hole structure, or can be placed on the pressure reducing valve body 01 to seal the shaft structure. According to the installation space of the pressure reducing valve to design ok.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. The present application is not limited to the technical field of injectors, but also includes other technical fields that require application of control valve products. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (9)

1. A new type of diaphragm type pressure reducing valve, comprising a pressure reducing valve body, a valve stem, a sealing seat, a valve seat, a diaphragm and a positioning seat are arranged in the pressure reducing valve body, and a pressure reducing valve is arranged on the upper end of the pressure reducing valve body. The pressure relief valve cover is provided with a main spring, a spring upper seat, and a second adjusting screw. The spring force of the main spring acts on the diaphragm, and the second adjusting screw can adjust the size of the spring force, so The pressure reducing valve body is provided with an air inlet channel and an air outlet channel, the pressure reducing valve body, the valve stem and the sealing seat are surrounded to form a high pressure chamber, and the pressure reducing valve body, the diaphragm, the valve seat and the valve stem are surrounded to form a voltage stabilizer The valve stem is provided with a valve stem shoulder, the valve stem can move up and down with the diaphragm, the high-pressure gas enters the high-pressure chamber from the intake passage, and the valve stem shoulder and the sealing seat form a communication channel, the gas flows from the high-pressure chamber into the pressure-stabilizing chamber, the diaphragm will be subjected to the downward spring force, the upward air pressure and frictional resistance of the pressure-stabilizing chamber, which can be adjusted by adjusting the stroke of the second adjusting screw When the spring force is greater than the combined force of air pressure and frictional resistance, the diaphragm drives the valve stem to move downward, the flow area between the valve stem and the sealing seat increases, and the air pressure in the pressure stabilization chamber increases. The diaphragm reaches a state of equilibrium. When the air pressure is greater than the combined force of the spring force and frictional resistance, the diaphragm drives the valve stem to move upward, the flow area between the valve stem and the sealing seat is reduced, and the pressure stabilization chamber The inner air pressure is reduced, so that the diaphragm reaches a balanced state, and the flow channel area of the valve stem shoulder is automatically adjusted through the force balance of the diaphragm, so as to achieve decompression and stable output of high-pressure gas, reducing The compressed stable gas is output through the gas outlet channel, and the force on the valve stem is not affected by the pressure value in the high pressure chamber. 2. A novel diaphragm type pressure reducing valve according to claim 1, a high pressure seal and a limit block are arranged between the pressure reducing valve body and the valve stem, when the pressure in the high pressure chamber is high, A retaining ring is arranged at the lower end of the high-pressure seal, a limit plate and a tightening block are arranged at the lower end of the valve stem, the tightening block fixes the limit plate on the valve stem, and an upper limit is set in the pressure reducing valve body, The lower end of the pressure reducing valve body is provided with a tight cap, the inside of the tight cap is provided with a first adjusting screw, the upper end of the first adjusting screw is provided with a lower limit, the valve rod moves within the stroke range of the lower limit and the upper limit, the The first adjusting screw can adjust the movement stroke of the valve rod. When the valve rod moves to the upper limit position, the valve rod and the sealing seat are in a sealed state, and the upper limit position and the lower limit position can be changed as required. It can be placed in other positions that can be limited. 3. A new type of diaphragm type pressure reducing valve according to claim 1, the diaphragm is fixed between the pressure reducing valve body and the pressure reducing valve cover, the upper end of the diaphragm is provided with an upper pressure plate, and the lower end is provided with a lower pressure plate, tightening The tightening block tightens the upper pressure plate, the diaphragm and the lower pressure plate on the positioning seat, the pressure reducing valve cover and the diaphragm are surrounded to form a first cavity, and the diaphragm realizes the connection between the pressure pressure chamber and the diaphragm. For the sealing between the first cavities, the number of springs in the first cavities includes 1, 2, 3 or more, and the specific number of springs is determined according to the requirements of different products. 4. A new type of diaphragm type pressure reducing valve according to claim 1, a positioning pin is arranged between the valve stem and the positioning seat, the diaphragm and the positioning seat can drive the valve stem to move up and down together, the The connection between the positioning seat and the valve stem also includes threaded connection, piston pin connection, retaining ring connection, bolt connection, universal joint connection, thrust contact connection, slot connection, interference connection, bolt connection, etc. the way to connect. 5. A new type of diaphragm type pressure reducing valve according to claim 1, the sealing structure of the valve stem and the sealing seat includes a conical surface seal, a line contact seal, a spherical surface seal, a plane seal and other sealing structures form. 6. A new type of diaphragm type pressure reducing valve according to claim 1, the sealing structure between the valve stem and the pressure reducing valve body includes a flood plug seal, a flood plug + retaining ring seal, and a seal ring seal , Sealing ring + retaining ring sealing, sealing ring + double retaining ring sealing and other sealing structures. 7. A novel diaphragm type pressure reducing valve according to claim 1, the pressure reducing valve comprises a first modification structure, a valve stem body is arranged in the pressure reducing valve body, and the sealing seat is located between the pressure reducing valve body and the valve body. Between the valve stem bodies, a seal is arranged between the valve stem and the valve stem body, a seal is arranged between the valve stem body and the pressure reducing valve body, and a valve stem spring is arranged between the valve stem and the first adjusting screw, so The valve stem body is provided with a first channel, and the first channel is communicated with the intake channel. 8. A novel diaphragm type pressure reducing valve according to claim 1, the pressure reducing valve comprises a second modified structure, and the pressure reducing valve body is provided with an air inlet joint, a pressure reducing valve core, a second channel , a filter element is arranged between the air inlet joint and the pressure reducing valve core, a throttle hole is arranged on the pressure reducing valve core, an air inlet hole is arranged on the air inlet joint, and the high-pressure gas enters from the air inlet hole and passes through the After the filter element is filtered, the first-stage decompression is carried out through the orifice, and the gas after the first-stage decompression is passed into the high-pressure chamber. pressure, the decompressed gas flows to the air outlet channel, a plurality of the pressure reducing valve cores can be set in the pressure reducing valve body according to the requirements, so as to realize multi-stage pressure reduction, and the rear end of the second channel is provided with a pressure limiting valve , when the pressure in the pressure-stabilizing chamber is greater than the set value, the gas is discharged from the pressure-limiting valve channel, and a stop valve is arranged at the rear end of the gas outlet channel, and the shut-off valve can close the gas outlet channel. 9. A new type of diaphragm type pressure reducing valve according to claim 1, the pressure reducing valve comprises a third modification structure, the lower end of the main spring is provided with a lower spring seat, and the lower spring seat is arranged on the bottom of the diaphragm. On the upper end, the lower end of the valve stem is provided with a valve stem spring, and the valve stem keeps in contact with the diaphragm under the action of the spring force of the valve stem spring, so that the valve stem and the diaphragm can move upward or downward at the same time.

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