阅读说明：本技术 一种燃气调压器 (Gas pressure regulator ) 是由 张枫 魏云南 王燕华 范京珲 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种燃气调压器,包括阀体及阀盖,所述的阀盖盖于所述的阀体上,所述的阀体内设有阀腔,所述的阀腔上连接有进气通道和出气通道,所述的阀腔包括一级调压腔和二级调压腔,所述的一级调压腔与所述的二级调压腔之间通过阀口相连通；所述的一级调压腔与所述的进气通道相连通,所述的一级调压腔与所述的进气通道之间设有气门芯调压组件；所述的二级调压腔与所述的出气通道相连通；所述的阀口与所述的二级调压腔之间设有杠杆调压组件。该燃气调压器不仅气密性好,泄露安全性高且输出性能较稳定。(The invention discloses a gas pressure regulator, which comprises a valve body and a valve cover, wherein the valve cover covers the valve body, a valve cavity is arranged in the valve body, an air inlet channel and an air outlet channel are connected to the valve cavity, the valve cavity comprises a primary pressure regulating cavity and a secondary pressure regulating cavity, and the primary pressure regulating cavity is communicated with the secondary pressure regulating cavity through a valve port; the primary pressure regulating cavity is communicated with the air inlet channel, and a valve core pressure regulating assembly is arranged between the primary pressure regulating cavity and the air inlet channel; the secondary pressure regulating cavity is communicated with the air outlet channel; and a lever pressure regulating component is arranged between the valve port and the secondary pressure regulating cavity. The gas pressure regulator has the advantages of good air tightness, high leakage safety and stable output performance.)

1. The utility model provides a gas pressure regulator, includes valve body and valve gap, the valve gap lid in the valve body on, the valve body in be equipped with the valve pocket, the valve pocket on be connected with inlet channel and air outlet channel, its characterized in that: the valve cavity comprises a primary pressure regulating cavity and a secondary pressure regulating cavity, and the primary pressure regulating cavity is communicated with the secondary pressure regulating cavity through a valve port; the primary pressure regulating cavity is communicated with the air inlet channel, and a valve core pressure regulating assembly is arranged between the primary pressure regulating cavity and the air inlet channel; the secondary pressure regulating cavity is communicated with the air outlet channel; and a lever pressure regulating component is arranged between the valve port and the secondary pressure regulating cavity.

2. The gas pressure regulator of claim 1, wherein: the valve core pressure regulating assembly comprises a high-pressure membrane, the high-pressure membrane is arranged in the valve cavity, and the valve cavity is partitioned into the primary pressure regulating cavity and the secondary pressure regulating cavity by the high-pressure membrane.

3. The gas pressure regulator of claim 2, wherein: the valve body is internally provided with an annular step, and the edge of the high-pressure diaphragm is connected to the surface of the annular step; the valve body is provided with a primary pressure regulating cavity below the high-pressure diaphragm, and the valve body is provided with a secondary pressure regulating cavity above the high-pressure diaphragm; the valve body is provided with a connecting channel which is positioned on the side wall of the primary pressure regulating cavity and is connected with the primary pressure regulating cavity and the secondary pressure regulating cavity, and the port of the connecting channel, which is positioned in the secondary pressure regulating cavity, is the valve port.

4. A gas pressure regulator according to claim 3, wherein: an annular embedded groove is formed in the annular step surface, an embedded ring is arranged at the edge of the high-pressure membrane, and the embedded ring is embedded into the embedded groove; the annular step surface is fixedly connected with a gland above the high-pressure diaphragm, and the edge of the gland presses the embedded ring.

5. The gas pressure regulator of claim 4, wherein: the edge of the gland is riveted on the annular step surface.

6. The gas pressure regulator of claim 4, wherein: the valve core pressure regulating assembly also comprises a high-pressure spring, and the high-pressure spring is arranged between the gland and the high-pressure diaphragm.

7. The gas pressure regulator of claim 6, wherein: the surface of the high-pressure diaphragm, which is close to the second pressure regulating cavity, is provided with a high-pressure diaphragm pad, and the middle part of the high-pressure diaphragm pad is riveted on the high-pressure diaphragm through a high-pressure diaphragm rivet.

8. The gas pressure regulator of claim 7, wherein: the edge of the high-pressure diaphragm pad is provided with a limit convex ring, and the lower end of the high-pressure spring is limited in the limit convex ring.

9. The gas pressure regulator of claim 6, wherein: the middle part of the gland is sunken towards the direction of the high-pressure diaphragm to form a boss, one side of the boss, which is far away from the high-pressure diaphragm, forms a groove, and the middle part of the boss is provided with a through hole which is communicated with the second pressure regulating cavity; the upper end of the high-pressure spring is sleeved outside the boss.

10. A gas pressure regulator according to claim 3, wherein: the lateral wall of the air inlet channel of the valve body is provided with a connecting seat, the lower side of the connecting channel is provided with an air inlet seat, the middle of the air inlet seat is provided with an air inlet through hole communicated with the air inlet channel and the one-level pressure regulating cavity, an air valve core of the air valve core assembly is arranged in the air inlet through hole, and the outer end of the valve core rod of the air valve core is supported on the high-pressure diaphragm.

11. The gas pressure regulator of claim 4, wherein: the lever pressure regulating assembly comprises a lever, a lever spring and a low-pressure diaphragm; the lever comprises an air blocking end and an adjusting end, and the air blocking end and the adjusting end of the lever are hinged to the annular step surface; the air blocking end is used for blocking or opening the valve port; the lever spring is supported between the adjusting end of the lever and the gland; the edge of the low-pressure diaphragm is fixed at the joint of the valve body and the valve cover, the valve cover is provided with an adjusting component, and the lower end of the adjusting component abuts against the low-pressure diaphragm.

12. The gas pressure regulator of claim 11, wherein: a first hinge seat and a second hinge seat are respectively arranged on the annular step surface and positioned on two sides of the valve port; the lever locate the first articulated seat and the second articulated seat between, be connected with the lever round pin on the lever, the both ends of lever round pin articulate respectively first articulated seat and second articulated seat on.

13. The gas pressure regulator of claim 12, wherein: the first hinged seat and the second hinged seat are located outside one side of the gland, and the gland is provided with a clearance inclined plane at a position close to the hinged position of the lever.

Technical Field

The invention relates to the technical field of valves, in particular to a gas pressure regulator.

Background

When camping outdoors, people of many outdoor tourism can carry the gas bottle that fires burning furnace and be equipped with fuel, carry through the gas in the middle of the gas bottle and fire burning furnace in the middle of, but because the gas in the gas bottle is convenient for carry and transport, its gas is through compressing into liquid in advance, consequently when gas output, its pressure is very big, when transporting in the middle of burning furnace, can't normally burn, consequently in gas output, can set up the voltage regulator usually and reduce gas pressure to make things convenient for the gas to burn.

Disclosure of Invention

The invention aims to solve the technical problem of providing a gas pressure regulator which is good in air tightness, high in leakage safety and stable in output performance.

The technical scheme of the invention is that a gas pressure regulator with the following structure is provided, which comprises a valve body and a valve cover, wherein the valve cover covers the valve body, a valve cavity is arranged in the valve body, an air inlet channel and an air outlet channel are connected to the valve cavity, the valve cavity comprises a primary pressure regulating cavity and a secondary pressure regulating cavity, and the primary pressure regulating cavity is communicated with the secondary pressure regulating cavity through a valve port; the primary pressure regulating cavity is communicated with the air inlet channel, and a valve core pressure regulating assembly is arranged between the primary pressure regulating cavity and the air inlet channel; the secondary pressure regulating cavity is communicated with the air outlet channel; and a lever pressure regulating component is arranged between the valve port and the secondary pressure regulating cavity.

After adopting the structure, compared with the prior art, the gas pressure regulator has the following advantages:

because the valve core pressure regulating assembly is arranged between the primary pressure regulating cavity of the gas pressure regulator and the air inlet channel; the lever pressure regulating assembly is arranged between the valve port and the secondary pressure regulating cavity, so that the gas pressure regulator integrates the advantages of the valve core pressure regulating assembly and the lever pressure regulating assembly, and when the air inlet pressure rises or falls, the two pressure regulating assemblies can generate complementary action, so that the gas pressure regulator has excellent leakage safety and output performance stability under different air inlet pressures.

As an improvement, the valve core pressure regulating assembly comprises a high-pressure membrane, the high-pressure membrane is arranged in the valve cavity, and the valve cavity is divided into the primary pressure regulating cavity and the secondary pressure regulating cavity by the high-pressure membrane. The valve cavity is separated into a primary pressure regulating cavity and a secondary pressure regulating cavity by a high-pressure diaphragm, and the valve cavity is simple in structure and reasonable in design.

As an improvement, an annular step is arranged in the valve body, and the edge of the high-pressure membrane is connected to the surface of the annular step; the valve body is provided with a primary pressure regulating cavity below the high-pressure diaphragm, and the valve body is provided with a secondary pressure regulating cavity above the high-pressure diaphragm; the valve body is provided with a connecting channel which is positioned on the side wall of the primary pressure regulating cavity and is connected with the primary pressure regulating cavity and the secondary pressure regulating cavity, and the port of the connecting channel, which is positioned in the secondary pressure regulating cavity, is the valve port. After adopting this kind of structure, set up cyclic annular step, the high-pressure diaphragm installation is more convenient, and sealed better processing between the two.

As an improvement, an annular embedded groove is arranged on the annular step surface, an embedded ring is arranged at the edge of the high-pressure membrane, and the embedded ring is embedded in the embedded groove; the annular step surface is fixedly connected with a gland above the high-pressure diaphragm, and the edge of the gland presses the embedded ring. After adopting this kind of structure, simple structure, the equipment is convenient, and sealed effect is better.

As an improvement, the edge of the gland is riveted on the annular step surface. After adopting this kind of structure, the equipment is more convenient.

As an improvement, the valve core pressure regulating assembly further comprises a high-pressure spring, and the high-pressure spring is arranged between the gland and the high-pressure diaphragm. After adopting this kind of structure, simple structure, the design is more reasonable.

As an improvement, a high-pressure diaphragm pad is arranged on the surface of the high-pressure diaphragm, which is close to the second pressure regulating cavity, and the middle part of the high-pressure diaphragm pad is riveted on the high-pressure diaphragm through a high-pressure diaphragm rivet. After the structure is adopted, the high-pressure diaphragm pad is arranged on the high-pressure diaphragm, so that the high-pressure diaphragm structure is more reliable.

As an improvement, the edge of the high-pressure diaphragm pad is provided with a limit convex ring, and the lower end of the high-pressure spring is limited in the limit convex ring. After adopting this kind of structure, limit structure is simpler.

As an improvement, the middle part of the gland is sunken towards the direction of the high-pressure diaphragm to form a boss, a groove is formed on one side of the boss far away from the high-pressure diaphragm, a through hole is formed in the middle part of the boss, and the through hole is communicated with the second pressure regulating cavity; the upper end of the high-pressure spring is sleeved outside the boss. After adopting this kind of structure, the boss can be used for spacing high-pressure spring, and structural design is more reasonable.

As an improvement, the lateral wall of the air inlet channel of the valve body on and be located the downside of connecting channel be equipped with the connecting seat, the connecting seat on sealing connection have an air inlet seat, the middle part of air inlet seat be equipped with air inlet channel and the one-level pressure regulating chamber intercommunication the air inlet through-hole, the air inlet through-hole in install the valve core of valve core subassembly, the outer end of the valve core pole of valve core support and be in the high-pressure diaphragm on. After adopting this kind of structure, the dismouting valve inside is more convenient.

As an improvement, the lever pressure regulating assembly comprises a lever, a lever spring and a low-pressure diaphragm; the lever comprises an air blocking end and an adjusting end, and the air blocking end and the adjusting end of the lever are hinged to the annular step surface; the air blocking end is used for blocking or opening the valve port; the lever spring is supported between the adjusting end of the lever and the gland; the edge of the low-pressure diaphragm is fixed at the joint of the valve body and the valve cover, the valve cover is provided with an adjusting component, and the lower end of the adjusting component abuts against the low-pressure diaphragm. After adopting this kind of structure, lever pressure regulating subassembly simple structure, reasonable in design.

As an improvement, a first hinge seat and a second hinge seat are respectively arranged on the annular step surface and positioned on two sides of the valve port; the lever locate the first articulated seat and the second articulated seat between, be connected with the lever round pin on the lever, the both ends of lever round pin articulate respectively first articulated seat and second articulated seat on. After adopting this kind of structure, the design is more reasonable.

As an improvement, the first hinged seat and the second hinged seat are positioned outside one side of the gland, and a clearance inclined plane is arranged at the position, close to the hinged position of the lever, of the gland. After adopting this kind of structure, set up on the gland and keep away the empty inclined plane, avoid the lever in the in-process of action, the gland produces its interference.

Drawings

Fig. 1 is a schematic perspective view of a gas pressure regulator according to the present invention.

Fig. 2 is a schematic perspective view of a valve body of the gas pressure regulator according to the present invention.

Fig. 3 is a schematic perspective view of the assembled valve body and high-pressure diaphragm of the gas pressure regulator of the present invention.

Fig. 4 is a schematic perspective view of a high-pressure diaphragm of the gas pressure regulator according to the present invention.

Fig. 5 is a schematic perspective view of another angle of the high-pressure diaphragm of the gas pressure regulator according to the present invention.

Fig. 6 is a schematic perspective view of a portion of the gas pressure regulator of the present invention.

Fig. 7 is a schematic perspective view of a gland of the gas pressure regulator of the present invention.

Fig. 8 is a schematic perspective view of another angle of the gland of the gas pressure regulator of the present invention.

Fig. 9 is a schematic perspective view of a portion of the gas pressure regulator of the present invention.

Fig. 10 is a schematic perspective view of a lever of the gas pressure regulator according to the present invention.

Fig. 11 is a schematic cross-sectional structural view of the gas pressure regulator of the present invention.

Fig. 12 is an enlarged schematic view of fig. 11.

Shown in the figure: 1. a valve body, 101, an air inlet channel, 102, an air outlet channel, 103, a primary pressure regulating cavity, 104, a secondary pressure regulating cavity, 105, a valve port, 106, a valve core, 107, a high-pressure diaphragm, 108, a high-pressure spring, 109, a valve core rod, 110, an annular step, 111, an embedded groove, 112, an embedded ring, 113, a high-pressure diaphragm rivet, 114, a high-pressure diaphragm pad, 115, a connecting channel, 116, a gland, 117, a mounting ring, 118, a limiting protrusion, 119, a limiting groove, 120, a gland cover, 121, a boss, 122, a groove, 123, a through hole, 124, a limiting concave ring, 125, a protrusion, 126, a first hinge seat, 127, a second hinge seat, 128, an air avoiding bevel, 129, a support ring, 130, a connecting seat, 131, an air inlet seat, 132, an air inlet through hole, 133, a valve core, 2, a valve cover, 201, a convex neck, 3, a lever, 301, an air blocking end, 302, an adjusting end, 304. the low-pressure diaphragm rivet is arranged on the lower portion of the lower.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification.

In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "having," "contains," and/or "containing," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

As shown in fig. 1 to 12, the invention discloses a gas pressure regulator, which comprises a valve body 1 and a valve cover 2, wherein the valve cover 2 covers the valve body 1.

As shown in fig. 1 to 2, the valve body 1 is provided with a valve cavity, an inlet passage 101 and an outlet passage 102. The air inlet channel 101 is arranged at the lower end of the valve body 1, the air outlet channel 102 is arranged at the side part of the valve body 1, and the air inlet channel 101 and the air outlet channel 102 are both communicated with the valve cavity. The air inlet channel 101 is used for being connected with the mouth of a gas bottle, and the air outlet channel 102 is used for being connected with a connecting pipe.

As shown in fig. 11 to 12, the valve chamber includes a primary pressure regulating chamber 103 and a secondary pressure regulating chamber 104, and the primary pressure regulating chamber 103 is communicated with the secondary pressure regulating chamber 104 through a valve port 105; the primary pressure regulating cavity 103 is communicated with the air inlet channel 101, and a valve core pressure regulating assembly is arranged between the primary pressure regulating cavity 103 and the air inlet channel 101; the secondary pressure regulating cavity 104 is communicated with the air outlet channel 102; a lever pressure regulating component is arranged between the valve port 105 and the secondary pressure regulating cavity 104.

The valve core pressure regulating component comprises a valve core 106, a high-pressure membrane 107 and a high-pressure spring 108. The valve core 106 is a conventional valve core, and will not be described herein again, and when the pressure at the valve core rod 109 of the valve core 106 is relatively high, the valve core rod 109 is triggered to open the valve of the valve core so as to conduct the valve. The inner wall of the valve body 1 is provided with an annular step 110, the annular step 110 is provided with an embedded groove 111, and the embedded groove 111 is of an annular structure. The high-pressure diaphragm 107 is circular, an embedded ring 112 is arranged on the edge of the high-pressure diaphragm 107, the thickness of the embedded ring 112 is larger than that of the high-pressure diaphragm 107, and the edge of the high-pressure diaphragm 107 is connected to the middle position of the side wall of the embedded ring 112. The shape and size of the insert ring 112 match those of the insert groove 111, and the insert ring 112 is inserted into the insert groove 111. The middle of the high pressure diaphragm 107 is riveted with a high pressure diaphragm pad 114 through a high pressure diaphragm rivet 113, and the high pressure diaphragm pad 114 is located on the upper side of the high pressure diaphragm 107. The high-pressure diaphragm 107 divides the valve cavity into a primary pressure regulating cavity 103 and a secondary pressure regulating cavity 104, the primary pressure regulating cavity 103 is arranged below the high-pressure diaphragm 107, and the secondary pressure regulating cavity 104 is arranged above the high-pressure diaphragm 107. A connecting channel 115 is arranged on the side wall of the valve body 1, one port of the connecting channel 115 is communicated with the primary pressure regulating cavity 103, the other port of the connecting channel 115 is communicated with the secondary pressure regulating cavity 104, and the other port of the connecting channel 115 is a valve port 105 and is arranged on the annular step surface.

As shown in fig. 7 to 8, a gland 116 is attached to the annular step surface, the edge of the gland 116 is pressed against the insert ring 112 of the high-pressure diaphragm 107, and the edge of the gland 116 is fixed to the annular step surface by caulking. The edge of the gland 116 is thick and solid to form a mounting ring 117, the lower surface of the mounting ring 117 is a plane, a limiting protrusion 118 is arranged on the lower plane of the mounting ring 117, a limiting groove 119 is arranged on the upper plane of the embedding ring of the high-pressure diaphragm 107, and the limiting protrusion 118 is embedded in the limiting groove 119. The inner side of the mounting ring 117 is provided with a hollow gland cover 120 protruding upwards, the middle part of the gland cover 120 is recessed downwards to form a boss 121, one side of the boss 121 far away from the high-pressure diaphragm 107 is provided with a groove 122, the middle part of the boss 121 is provided with a through hole 123, and the through hole 123 is communicated with the secondary pressure regulating cavity 104. The high pressure spring 108 is disposed between the gland 116 and the high pressure diaphragm pad 114. The edge of the high-pressure diaphragm pad 114 is provided with a limit convex ring 124, and the lower end of the high-pressure spring 108 is limited at the inner side of the limit convex ring 124, so that the lower end of the high-pressure spring 108 is prevented from being separated in the using process. The upper end of the high-pressure spring 108 is sleeved outside the boss 121, so that the upper end of the high-pressure spring 108 is prevented from falling out in the using process.

As shown in fig. 10, the lever pressure regulating assembly includes a lever 3, a lever spring 4 and a low pressure diaphragm 5, and the lever 3 includes a gas blocking end 301 and a regulating end 302. A protrusion 125 is disposed on the annular step surface and located outside the gland 116, and the middle of the protrusion 125 is hollow to form the valve port 105. The annular step surface is provided with a first hinging seat 126 and a second hinging seat 127 which are respectively arranged at two sides of the bulge 125, and the first hinging seat 126 and the second hinging seat 127 are both arranged at the outer side of the gland 116 and are symmetrically arranged with each other. The portion between the gas blocking end 301 and the adjusting end 302 of the lever 3 is hinged to the first hinge seat 126 and the second hinge seat 127 through the lever pin 6, so that the lever 3 can swing back and forth with the lever pin 6 as a fulcrum. A clearance inclined plane 128 is arranged on the part of the mounting ring 117 of the pressing cover 116, which is located between the first hinge seat 126 and the second hinge seat 127, so as to avoid interference on the lever 3 when the lever 3 swings. A plug (not shown) is disposed at a side of the air blocking end 301 of the lever 3, which is close to the valve port 105, and the plug is used for blocking the valve port 105. The lever spring 4 is disposed between the pressing cover 116 and the adjusting end 302 of the lever 3. The bottom of the groove 122 of the gland 116 is provided with a support ring 129, and the middle part of the support ring 129 is the through hole 123. The lower end of the lever spring 4 is mounted on the support ring 129, and the side wall of the groove 122 limits the lever spring 4. The adjusting end 302 of the lever 3 is provided with a limiting boss 303 on the lower surface close to the gland 116, and the upper end of the lever spring 4 is sleeved outside the limiting boss 303.

A low-pressure diaphragm 5 is arranged between the valve body 1 and the valve cover 2, and the low-pressure diaphragm 5 is pressed at the joint of the valve body 1 and the valve cover 2. The upper side of the low-pressure diaphragm 5 is provided with a low-pressure diaphragm pad 501, and the low-pressure diaphragm pad 501 is riveted on the low-pressure diaphragm 5 through a low-pressure diaphragm rivet 502. The upper end of the valve cover 2 is provided with a hollow convex neck 201, and the upper end of the convex neck 201 is provided with a knob 7 which is axially limited and can rotate in the circumferential direction. The convex neck 201 is matched with the sliding part 8 in a sliding mode, the sliding part 8 can slide along the length direction of the convex neck 201, and the convex neck 201 is used for limiting the sliding part in the circumferential direction. The upper end face of the sliding piece 8 is provided with a threaded hole, the inner wall of the knob 7 is provided with a screw rod, and the screw rod is matched in the threaded hole. A knob spring 10 is arranged between the inner wall of the knob 7 and the upper end of the convex neck 201, and a low-pressure spring 11 is arranged between the lower end of the sliding part 8 and the low-pressure diaphragm pad 501. The adjusting end 302 of the lever 3 is provided with a conical bulge 304 on the upper surface close to the low pressure diaphragm 5, and the conical bulge 304 abuts against the middle part of the low pressure diaphragm rivet 502.

The side wall of the air inlet channel 101 of the valve body 1 and the lower side of the connecting channel 115 are provided with a connecting seat 130, the connecting seat 130 is connected with an air inlet seat 131 in a sealing manner, and the middle part of the air inlet seat 131 is provided with an air inlet through hole 132 communicated with the air inlet channel 101 and the primary pressure regulating cavity 103. The valve core 133 is installed in the air inlet through hole 132, and the outer end of the valve core rod 109 of the valve core 133 is abutted against the middle part of the high-pressure diaphragm rivet 113 of the high-pressure diaphragm 107.

When the gas pressure regulator is assembled, the lower end of the valve body is connected with the outlet of the small gas cylinder, so that the gas inlet channel of the valve body is communicated with the inner cavity of the small gas cylinder, and the pressure in the gas inlet channel is the same as the pressure in the small gas cylinder. When the gas pressure regulator of the invention works:

when the gas pressure regulator is connected with the outlet of the small gas bottle, the gas is input into the pressure regulator at the pressure of 25-201 PSI (the more sufficient the gas amount in the bottle is, the higher the pressure is), the gas firstly passes through the first-stage valve core pressure reducing structure of the pressure regulator, when a certain amount of gas passes through the valve core, the pressure in the area below the high-pressure membrane is increased, the high-pressure membrane overcomes the upward displacement of the high-pressure spring, the upward displacement of the high-pressure membrane enables the rivet which props against the valve core to be separated from the valve core (the valve core is closed) so that the pressure is not increased any more, only when the gas is output, the pressure in the area below the high-pressure membrane is reduced, the high-pressure membrane is downwards displaced under the action of the high-pressure spring, the valve core is switched on so that the gas passes through to supplement the pressure, the high-frequency circulation makes use of the back pressure characteristic of the valve inside (the lower the pressure of the gas cylinder, the higher the pressure is after one-stage pressure reduction), so that the pressure of the first-stage pressure reduction area below the high-pressure diaphragm is always kept in a controllable pressure range of 10-15 PSI.

The gas pressure fluctuation range after the first-stage pressure reduction is still large and cannot meet the requirement of accurately controlling the gas output, the scheme is that the gas subjected to the first-stage pressure reduction is subjected to accurate pressure reduction through a lever two-stage pressure reduction structure, after a certain amount of gas passes through a lever valve port, the pressure below a low-pressure diaphragm is improved to enable the low-pressure diaphragm to overcome a low-pressure spring to move upwards, the low-pressure diaphragm moves upwards to enable a rivet against the tail end of the lever to be separated, the tail end of the lever can close a valve port under the action of the lever spring below the lever to enable the pressure in a second-stage pressure reduction area not to be increased, only when the gas is output to enable the pressure in the area below the low-pressure diaphragm to reduce, the low-pressure diaphragm can move downwards under the action of the low-pressure spring above to overcome the lever spring, the valve, the gas output requirement that the pressure of the gas cylinder of 25-201 PSI is accurately regulated to be 5 +/-0.3 kPa is finally met.