CN216555562U

CN216555562U - Pilot-operated type first-stage gas pressure reducer

Info

Publication number: CN216555562U
Application number: CN202220127983.5U
Authority: CN
Inventors: 王军安; 谭中心
Original assignee: Ningbo Chaojie Medical Devices Co ltd
Current assignee: Ningbo Chaojie Medical Devices Co ltd
Priority date: 2022-01-18
Filing date: 2022-01-18
Publication date: 2022-05-17
Anticipated expiration: 2032-01-18

Abstract

The utility model provides a pilot-operated type first-stage gas pressure reducer, comprising: the pressure regulating valve comprises a main body and a valve core movably arranged in the main body, wherein a first air chamber and a second air chamber are arranged in the main body, the valve core separates the first air chamber into an air inlet chamber and an air outlet chamber, a pressure regulating screw rod is arranged on the main body, a piston type metal diaphragm is slidably arranged in the second air chamber, the metal diaphragm separates the second air chamber into a pilot air chamber and a low-pressure air chamber, the main body is provided with a pilot pressure regulating mechanism, and the pilot pressure regulating mechanism comprises the pilot air chamber and an air guide channel communicated with the pilot air chamber. The pilot-operated type first-stage gas pressure reducer has the advantages of simple structure and low production cost; the piston type metal diaphragm is driven by the adjusting screw rod and low-pressure pilot gas together, so that the adjusting screw rod is more labor-saving to adjust; the pressure resistance of the metal diaphragm is greatly enhanced, and the metal diaphragm cannot be broken under the condition that the pressure reducer fails and is in series pressure.

Description

Pilot-operated type first-stage gas pressure reducer

Technical Field

The utility model relates to the technical field of gas pressure reducers, in particular to a pilot type first-stage gas pressure reducer.

Background

A gas pressure reducer is a device for reducing pressure and regulating flow rate of high-pressure gas. The gas pressure reducer is widely used, and when the pressure in a high-pressure gas bottle or a pipeline is too high and is not suitable for working, the pressure must be reduced through the pressure reducer so as to reach the pressure required by normal use. The medical oxygen cylinder needs to be decompressed by a decompressor to output oxygen. The pressure reducer not only has the function of reducing pressure, but also has the function of stabilizing pressure, and when the flow of the outlet of the gas bottle or the pipeline is changed, the pressure is reduced and regulated through the pressure reducer, so that stable output pressure can be kept.

The traditional first-level gas pressure reducer mainly adopts an adjusting screw to drive a metal diaphragm with the thickness of about 0.8mm to drive a valve core to reduce pressure, the pressure resistance of the thin metal diaphragm is limited, and the thin metal diaphragm has the risk of breaking under the condition of pressure serial connection due to the fault of the pressure reducer.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

The utility model aims to solve the technical problem of providing a pilot type first-level gas pressure reducer with simple structure, which has low production cost; the piston type thickened metal diaphragm is driven by the adjusting screw and the low-pressure pilot gas together, the adjusting screw is adjusted more easily, the metal diaphragm is not easy to break, and the pressure resistance of the metal diaphragm is greatly enhanced.

(II) technical scheme

In order to solve the above technical problem, the present invention provides a pilot type primary gas pressure reducer, comprising: the pressure regulating valve comprises a main body and a valve core movably arranged in the main body, wherein a first air chamber and a second air chamber are arranged in the main body, the valve core divides the first air chamber into an air inlet chamber and an air outlet chamber, a pressure regulating screw rod is arranged on the main body, a piston type metal diaphragm is arranged in the second air chamber in a sliding mode, the metal diaphragm divides the second air chamber into a pilot air chamber and a low-pressure air chamber, the main body is provided with a pilot type pressure regulating mechanism, and the pilot type pressure regulating mechanism comprises the pilot air chamber and an air guide channel communicated with the pilot air chamber; when the valve core is used, low-pressure gas is introduced into the pilot gas chamber through the gas guide channel, the pressure regulating screw rod is rotated, the metal diaphragm and the valve core are driven to move, and therefore the opening degree of the valve core is controlled. The pilot type first-stage gas pressure reducer adopts a dual control mode of a pilot type and an adjusting screw rod, firstly uses the adjusting screw rod to preset certain pressure, then uses low-pressure gas introduced through a gas guide channel on the adjusting screw rod to pilot drive a metal diaphragm, and increases the downward pressure on the metal diaphragm, so that the adjusting screw rod does not need to be screwed too much during adjustment, thereby saving labor and being safe, and simultaneously increasing the pressure regulating range of the pressure reducer.

According to the pilot-operated first-stage gas pressure reducer, the valve core sealing seat is independently detachable, so that economy and convenience in maintenance are realized; the structure is simple, and the production cost is low; the adjusting screw and the low-pressure pilot gas are adopted to drive the piston type metal diaphragm together, so that the adjusting screw is more labor-saving to adjust; the pressure resistance of the metal diaphragm is greatly enhanced, and the metal diaphragm cannot be broken under the condition of the pressure reducer fault and series pressure; the dual control mode of a pilot and an adjusting screw is adopted, the adjusting screw is used for presetting a certain pressure, then low-pressure gas introduced through a gas guide channel on the adjusting screw is used for pilot driving the metal diaphragm, the downward pressure on the metal diaphragm is increased, the adjusting screw does not need to be screwed too much during adjustment, labor is saved, safety is realized, and the pressure adjusting range of the pressure reducer is enlarged; the packing ring is arranged between the lower body of the valve core and the base end enclosure, the packing ring made of PTFE has excellent lubricating effect, the requirement on the processing of the inner hole of the base end enclosure can be reduced, and the clamping stagnation phenomenon of the valve core is prevented.

Furthermore, the air guide channel is arranged on the pressure regulating screw rod, a pressure regulating spring is arranged between the pressure regulating screw rod and the metal diaphragm, and the pressure regulating screw rod drives the metal diaphragm to slide through the pressure regulating spring. When the pressure regulating screw rod is screwed downwards, the pressure regulating screw rod presses the pressure regulating spring downwards, and the pressure regulating spring drives the metal diaphragm to move downwards, so that the valve core is driven to move downwards, and the opening degree of the valve core is increased. When the pressure regulating screw rod is unscrewed upwards, the pressure regulating spring is loosened, the metal diaphragm moves upwards, and the valve core moves upwards to reduce the opening degree of the valve core.

Further, the bottom of the pressure regulating screw rod is abutted to a pressure regulating spring pressing plate, one end of the pressure regulating spring is abutted to the bottom of the pressure regulating spring pressing plate, and the other end of the pressure regulating spring is abutted to the metal diaphragm. The pressure regulating screw presses the pressure regulating spring downwards through the pressure regulating spring pressing plate.

Further, the pressure regulating screw is provided with an air guide through groove, and the air guide channel is communicated with the pilot air chamber through the air guide through groove; the pressure regulating screw rod is provided with a threaded hole for connecting a quick connector. The threaded hole is an M5 threaded hole, and external low-pressure gas is connected into the threaded hole through the quick connector.

Further, the base head is installed to the main part lower extreme, the case with be equipped with the packing ring between the base head, the packing ring is the opening packing ring, the packing ring is PTFE (polytetrafluoroethylene) material, the base head with be equipped with the sixth sealing washer between the main part, the base head with be equipped with the case spring between the case, the case spring is right the case has ascending elasticity.

Furthermore, the bottom of the metal membrane is abutted against the upper end of the valve core, the valve core comprises an upper valve core body, a lower valve core body and a valve core sealing column arranged between the upper valve core body and the lower valve core body, and a valve core sealing seat corresponding to the valve core sealing column is detachably mounted in the main body. The base end socket and the lower body of the valve core of the traditional first-level pressure reducer are in clearance fit by metal and metal. Therefore, the requirement on the finish degree of a metal processing surface is high, and the phenomenon of valve core clamping stagnation is easy to occur. The gasket of the pressure reducer is arranged between the lower body of the valve core and the base end enclosure, and the gasket made of PTFE has excellent lubricating effect, so that the requirement on the processing of the inner hole of the base end enclosure can be reduced, and the phenomenon of clamping stagnation of the valve core is prevented. The valve core sealing seat of the traditional first-level pressure reducer is integrated with the lower seat, so that the whole lower seat needs to be replaced if the valve core sealing seat has problems, which is waste and inconvenient to maintain. The valve core sealing seat of the pressure reducer is independently detachable, so that the pressure reducer is economical and convenient to maintain.

Further, a first sealing ring is arranged between the pressure regulating screw rod and the main body, the first sealing ring is a fluorine rubber sealing ring, and the fluorine rubber sealing ring is wear-resistant and ageing-resistant; a second sealing ring and a third sealing ring are arranged between the metal diaphragm and the main body, a fourth sealing ring is arranged between the upper valve core body and the main body, and the fourth sealing ring is a fluorine rubber sealing ring; and a fifth sealing ring is arranged between the valve core sealing seat and the main body, so that the sealing effect is good.

Furthermore, an arc-shaped positioning head is arranged at the lower end part of the pressure regulating screw rod, and the pressure regulating spring pressing plate is provided with a positioning groove corresponding to the arc-shaped positioning head, so that the arc-shaped positioning head and the pressure regulating spring pressing plate can be positioned, and the positioning effect is good; the pressure regulating spring clamp plate is provided with a first installation part for installing the pressure regulating spring, and the metal diaphragm is provided with a second installation part for installing the pressure regulating spring, so that the pressure regulating spring is installed more stably. The metal diaphragm is a thickened copper diaphragm. The traditional pressure reducer drives the valve core through the bending deformation of the metal diaphragm, so that the traditional metal diaphragm is very thin, the thickness is about 0.8mm, the pressure resistance of the thin metal diaphragm is limited, and the thin metal diaphragm has the risk of breaking under the condition of the fault and the serial pressure of the pressure reducer. The pilot type first-stage gas pressure reducer can be used for pressure reduction output of an oxygen cylinder, the metal diaphragm is in a piston type and is arranged in the main body in a sliding mode, and the valve core is driven by sliding of the metal diaphragm, so that the thickness of the metal diaphragm can be thickened, the thickness is about 4 mm, a copper diaphragm with the thickness of 4 mm can resist the pressure of 15MPa, namely the rated pressure of the oxygen cylinder, and the metal diaphragm cannot be broken under the condition that the pressure reducer is in fault and series pressure.

Further, the main part is provided with a conduction groove, and the air outlet chamber is conducted with the low-pressure air chamber through the conduction groove. Under the condition that the pressure reducer breaks down and is in series pressure, high-pressure gas in the gas inlet chamber can be in series pressure to the gas outlet chamber, high-pressure gas in the gas outlet chamber enters into the low-pressure gas chamber through the conduction groove, and at the moment, the metal diaphragm slides upwards under the action of the high-pressure gas, so that the valve core moves upwards, the opening degree of the valve core is reduced, and the use is safe and reliable.

Further, the main part includes upper cover and lower seat, be equipped with the seventh sealing washer between upper cover and the lower seat, the lower seat is equipped with air inlet and gas outlet, the air inlet with the air inlet chamber intercommunication, the gas outlet with go out the air chamber intercommunication, convenient to use. The air inlet can be used for connecting an oxygen cylinder and other high-pressure gas cylinders or high-pressure gas pipelines, and the air outlet is used for connecting low-pressure output equipment.

(III) advantageous effects

The pilot type first-stage gas pressure reducer has the advantages of simple structure and low production cost; the adjusting screw and the low-pressure pilot gas are adopted to drive the piston type metal diaphragm together, so that the adjusting screw is more labor-saving to adjust; the pressure resistance of the metal diaphragm is greatly enhanced, and the metal diaphragm cannot be broken under the condition of the pressure reducer fault and series pressure; the dual control mode of a pilot and an adjusting screw is adopted, the adjusting screw is used for presetting a certain pressure, then low-pressure gas introduced through a gas guide channel on the adjusting screw is used for pilot driving the metal diaphragm, the downward pressure on the metal diaphragm is increased, the adjusting screw does not need to be screwed too much during adjustment, labor is saved, safety is realized, and the pressure adjusting range of the pressure reducer is enlarged; the gasket is arranged between the lower body of the valve core and the base end enclosure, and the gasket made of PTFE has excellent lubricating effect, can reduce the requirement on the processing of the inner hole of the base end enclosure, and simultaneously prevents the valve core from being clamped; the valve core sealing seat is independently detachable, so that the valve core sealing seat is economical and convenient to maintain.

Drawings

FIG. 1 is a schematic structural view of a pilot-operated first-stage gas pressure reducer according to the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

wherein: 1 is a main body, 101 is a first air chamber, 102 is a second air chamber, 103 is an air inlet chamber, 104 is an air outlet chamber, 105 is a pilot air chamber, 106 is a low-pressure air chamber, 107 is a conduction groove, 108 is an upper cover, 109 is a lower seat, 2 is a valve core, 201 is a valve core upper body, 202 is a valve core lower body, 203 is a valve core sealing column, 204 is a valve core sealing seat, 3 is a pressure regulating screw rod, 301 is an air guide through groove, 302 is a threaded hole, 4 is an air guide channel, 5 is a metal diaphragm, 6 is a pressure regulating spring, 7 is a pressure regulating spring pressing plate, 8 is a base sealing head, 9 is a gasket, 10 is a seventh sealing ring, 11 is a first sealing ring, 12 is a second sealing ring, 13 is a third sealing ring, 14 is a fourth sealing ring, 15 is a fifth sealing ring, 16 is a sixth sealing ring, 17 is a valve core spring, 18 is an arc-shaped positioning head, 19 is a positioning groove, 20 is a first mounting part, 21 is a second mounting part, 22 is an air inlet, And 23 is an air outlet.

Detailed Description

Referring to fig. 1 and 2, the present invention provides a pilot type one-stage gas pressure reducer, comprising: the pressure regulating valve comprises a main body 1 and a valve core 2 movably arranged in the main body 1, wherein a first air chamber 101 and a second air chamber 102 are arranged in the main body 1, the valve core 2 divides the first air chamber 101 into an air inlet chamber 103 and an air outlet chamber 104, a pressure regulating screw rod 3 is arranged on the main body 1, a piston type metal diaphragm 5 is slidably arranged in the second air chamber 102, the metal diaphragm 5 divides the second air chamber 102 into a pilot air chamber 105 and a low-pressure air chamber 106, the main body 1 is provided with a pilot type pressure regulating mechanism, and the pilot type pressure regulating mechanism comprises a pilot air chamber 105 and an air guide channel 4 communicated with the pilot air chamber 105; when the valve is used, low-pressure gas is introduced into the pilot gas chamber 105 through the gas guide channel 4, the pressure regulating screw 3 is rotated, and the metal diaphragm 5 and the valve core 2 are driven to move, so that the opening degree of the valve core 2 is controlled. The pilot-operated type first-stage gas pressure reducer adopts a dual control mode of a pilot operation and an adjusting screw rod, firstly uses the adjusting screw rod to preset a certain pressure, and then uses low-pressure gas introduced through the gas guide channel 4 on the adjusting screw rod to pilot-operate the metal diaphragm so as to increase the downward pressure on the metal diaphragm, so that the adjusting screw rod does not need to be screwed too much during adjustment, thereby saving labor and being safe, and simultaneously increasing the pressure regulating range of the pressure reducer.

Referring to fig. 1, the air guide channel 4 is arranged on the pressure regulating screw 3, the pressure regulating spring 6 is arranged between the pressure regulating screw 3 and the metal diaphragm 5, and the pressure regulating screw 3 drives the metal diaphragm 5 to slide through the pressure regulating spring 6. When the pressure regulating screw 3 is screwed downwards, the pressure regulating screw 3 presses the pressure regulating spring 6 downwards, and at the moment, the pressure regulating spring 6 drives the metal diaphragm 5 to move downwards, so that the valve core is driven to move downwards, and the opening degree of the valve core is increased. When the pressure regulating screw rod 3 is unscrewed upwards, the pressure regulating spring 6 is loosened, the metal diaphragm 5 moves upwards, and the valve core moves upwards to reduce the opening degree of the valve core. The bottom of the pressure regulating screw rod 3 is abutted to a pressure regulating spring pressing plate 7, one end of the pressure regulating spring 6 is abutted to the bottom of the pressure regulating spring pressing plate 7, and the other end of the pressure regulating spring 6 is abutted to the metal diaphragm 5. The pressure regulating screw 3 presses down the pressure regulating spring 6 through the pressure regulating spring pressing plate 7.

Referring to fig. 1, the pressure regulating screw 3 is provided with an air guide through groove 301, and the air guide channel 4 is communicated with the pilot air chamber 105 through the air guide through groove 301; the pressure regulating screw 3 is provided with a threaded hole 302 for connecting a quick coupling. The screw hole is the M5 screw hole, inserts outside low-pressure gas through quick-operation joint. Base head 8 is installed to main part 1 lower extreme, is equipped with packing ring 9 between case 2 and the base head 8, and packing ring 9 is the opening packing ring, and packing ring 9 is PTFE (polytetrafluoroethylene) material, is equipped with sixth sealing washer 16 between base head 8 and the main part 1, is equipped with case spring 17 between base head 8 and the case 2, and case spring 17 has ascending elasticity to case 2.

Referring to fig. 1, the bottom of the metal membrane 5 abuts against the upper end of the valve core 2, the valve core 2 comprises a valve core upper body 201, a valve core lower body 202 and a valve core sealing post 203 arranged between the valve core upper body 201 and the valve core lower body 202, and a valve core sealing seat 204 corresponding to the valve core sealing post 203 is detachably mounted in the main body 1; when the opening degree of the valve core is zero, the upper end of the valve core sealing column 203 abuts against the bottom of the valve core sealing seat 204 for sealing. The base end socket and the lower body of the valve core of the traditional first-level pressure reducer are in clearance fit by metal and metal. Therefore, the requirement on the finish degree of a metal processing surface is high, and the phenomenon of valve core clamping stagnation is easy to occur. The gasket 9 of the pressure reducer is arranged between the valve core lower body 202 and the base end enclosure 8, and the gasket 9 made of PTFE has excellent lubricating effect, so that the requirement on the inner hole machining of the base end enclosure can be reduced, and the phenomenon of clamping stagnation of the valve core is prevented. The valve core sealing seat of the traditional first-level pressure reducer is integrated with the lower seat 109, so that the whole lower seat needs to be replaced if the valve core sealing seat has problems, which is waste and inconvenient to maintain. The valve core sealing seat 204 of the pressure reducer of the utility model is independently detachable, thus being economical and convenient for maintenance.

Referring to fig. 1, a first sealing ring 11 is arranged between the pressure regulating screw 3 and the main body 1, the first sealing ring 11 is a fluorine rubber sealing ring, and the fluorine rubber sealing ring is wear-resistant and aging-resistant; a second sealing ring 12 and a third sealing ring 13 are arranged between the metal diaphragm 5 and the main body 1, a fourth sealing ring 14 is arranged between the valve core upper body 201 and the main body 1, and the fourth sealing ring 14 is a fluorine rubber sealing ring; and a fifth sealing ring 15 is arranged between the valve core sealing seat 204 and the main body 1, so that the sealing effect is good.

Referring to fig. 1 and 2, an arc-shaped positioning head 18 is arranged at the lower end part of the pressure regulating screw rod 3, and a positioning groove 19 corresponding to the arc-shaped positioning head 18 is arranged on the pressure regulating spring pressing plate 7, so that the arc-shaped positioning head 18 and the pressure regulating spring pressing plate can be positioned, and the positioning effect is good; the pressure regulating spring pressing plate 7 is provided with a first mounting part 20 for mounting the pressure regulating spring 6 in a protruding mode, the metal diaphragm 5 is provided with a second mounting part 21 for mounting the pressure regulating spring 6 in a protruding mode, and the pressure regulating spring 6 is mounted more stably. The metal diaphragm 5 is a thickened copper diaphragm. The traditional pressure reducer drives the valve core through the bending deformation of the metal diaphragm, so that the traditional metal diaphragm is very thin, the thickness is about 0.8mm, the pressure resistance of the thin metal diaphragm is limited, and the thin metal diaphragm has the risk of breaking under the condition of the fault and the serial pressure of the pressure reducer. The pilot type first-stage gas pressure reducer can be used for pressure reduction output of an oxygen cylinder, the metal diaphragm is in a piston type and is arranged in the main body in a sliding mode, and the valve core is driven by sliding of the metal diaphragm, so that the thickness of the metal diaphragm can be thickened, the thickness is about 4 mm, a copper diaphragm with the thickness of 4 mm can resist the pressure of 15MPa, namely the rated pressure of the oxygen cylinder, and the metal diaphragm cannot be broken under the condition that the pressure reducer is in fault and series pressure.

Referring to fig. 1, the main body 1 is provided with a conduction groove 107, and the gas outlet chamber 104 is conducted with the low-pressure gas chamber 106 through the conduction groove 107. Under the condition that the pressure reducer broke down and string pressed, high-pressure gas in the inlet chamber can string pressed to the outlet chamber in, the high-pressure gas of the outlet chamber enters into to low-pressure air chamber 106 through conduction groove 107 in, and metal diaphragm upwards slides under the high-pressure gas effect this moment for the case upwards moves, makes the aperture of case reduce, uses safe and reliable. The main part 1 includes upper cover 108 and lower seat 109, is equipped with seventh sealing washer 10 between upper cover 108 and the lower seat 109, and lower seat 109 is equipped with air inlet 22 and gas outlet 23, and air inlet 22 communicates with air inlet chamber 103, and gas outlet 23 communicates with air outlet chamber 104, convenient to use. The gas inlet 22 can be used for connecting a high-pressure gas cylinder such as an oxygen cylinder or a high-pressure gas pipeline, and the gas outlet is used for connecting a low-pressure output device. The upper cover 108, the valve core and the metal diaphragm are all revolving body parts.

According to the pilot-operated type primary gas pressure reducer, the gasket is arranged between the lower body of the valve core and the base end enclosure, and the gasket made of PTFE has an excellent lubricating effect, so that the requirement on the machining of an inner hole of the base end enclosure can be reduced, and the phenomenon of clamping stagnation of the valve core is prevented; the valve core sealing seat is independently detachable, so that the valve core sealing seat is economical and convenient to maintain; the structure is simple, and the production cost is low; the adjusting screw and the low-pressure pilot gas are adopted to drive the piston type metal diaphragm together, so that the adjusting screw is more labor-saving to adjust; the pressure resistance of the metal diaphragm is greatly enhanced, and the metal diaphragm cannot be broken under the condition of the pressure reducer fault and series pressure; the dual control mode of the pilot and the adjusting screw is adopted, the adjusting screw is used for presetting a certain pressure, then the low-pressure gas guided through the gas guide channel on the adjusting screw is used for pilot driving the metal diaphragm, the downward pressure on the metal diaphragm is increased, the adjusting screw does not need to be screwed too much during adjustment, labor is saved, safety is realized, and the pressure adjusting range of the pressure reducer is enlarged.

The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, it is possible to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A pilot-operated stage one gas pressure reducer comprising: the pressure regulating valve comprises a main body (1) and a valve core (2) movably installed in the main body (1), and is characterized in that a first air chamber (101) and a second air chamber (102) are arranged in the main body (1), the first air chamber (101) is separated by the valve core (2) to form an air inlet chamber (103) and an air outlet chamber (104), a pressure regulating screw rod (3) is installed on the main body (1), a piston type metal diaphragm (5) is installed in the second air chamber (102) in a sliding mode, the second air chamber (102) is separated by the metal diaphragm (5) to form a pilot air chamber (105) and a low-pressure air chamber (106), a pilot type pressure regulating mechanism is arranged on the main body (1), and the pilot type pressure regulating mechanism comprises the pilot air chamber (105) and an air guide channel (4) communicated with the pilot air chamber (105); when the pressure regulating valve is used, low-pressure gas is introduced into the pilot air chamber (105) through the gas guide channel (4), the pressure regulating screw (3) is rotated, the metal diaphragm (5) and the valve core (2) are driven to move, and therefore the opening degree of the valve core (2) is controlled.

2. The pilot-operated type one-stage gas pressure reducer according to claim 1, wherein the gas guide channel (4) is arranged on the pressure regulating screw (3), a pressure regulating spring (6) is arranged between the pressure regulating screw (3) and the metal diaphragm (5), and the pressure regulating screw (3) drives the metal diaphragm (5) to slide through the pressure regulating spring (6).

3. The pilot-operated type one-stage gas pressure reducer according to claim 2, wherein a pressure regulating spring pressure plate (7) is arranged at the bottom of the pressure regulating screw (3) in an abutting manner, one end of the pressure regulating spring (6) abuts against the bottom of the pressure regulating spring pressure plate (7), and the other end of the pressure regulating spring (6) abuts against the metal diaphragm (5).

4. The pilot-operated primary gas pressure reducer according to claim 1, wherein the pressure regulating screw (3) is provided with a gas guiding through groove (301), and the gas guiding channel (4) is communicated with the pilot gas chamber (105) through the gas guiding through groove (301); the pressure regulating screw rod (3) is provided with a threaded hole (302) for connecting a quick connector.

5. The pilot-operated type primary gas pressure reducer according to claim 1, wherein a base seal head (8) is installed at the lower end of the main body (1), a gasket (9) is arranged between the valve element (2) and the base seal head (8), the gasket (9) is an open gasket, the gasket (9) is made of PTFE, a sixth sealing ring (16) is arranged between the base seal head (8) and the main body (1), and a valve element spring (17) is arranged between the base seal head (8) and the valve element (2).

6. The pilot-operated type one-stage gas pressure reducer according to claim 1, wherein the bottom of the metal diaphragm (5) abuts against the upper end of the valve core (2), the valve core (2) comprises an upper valve core body (201), a lower valve core body (202) and a sealing valve core post (203) arranged between the upper valve core body (201) and the lower valve core body (202), and a sealing valve core seat (204) corresponding to the sealing valve core post (203) is detachably installed in the main body (1).

7. The pilot-operated type primary gas pressure reducer according to claim 6, wherein a first seal ring (11) is arranged between the pressure regulating screw (3) and the main body (1), a second seal ring (12) and a third seal ring (13) are arranged between the metal diaphragm (5) and the main body (1), a fourth seal ring (14) is arranged between the valve core upper body (201) and the main body (1), and a fifth seal ring (15) is arranged between the valve core seal seat (204) and the main body (1).

8. The pilot-operated type one-stage gas pressure reducer according to claim 3, wherein an arc-shaped positioning head (18) is arranged at the lower end of the pressure regulating screw (3), the pressure regulating spring pressing plate (7) is provided with a positioning groove (19) corresponding to the arc-shaped positioning head (18), a first mounting part (20) for mounting the pressure regulating spring (6) is convexly arranged on the pressure regulating spring pressing plate (7), a second mounting part (21) for mounting the pressure regulating spring (6) is convexly arranged on the metal diaphragm (5), and the metal diaphragm (5) is a thickened copper diaphragm.

9. Pilot-operated primary gas pressure reducer according to claim 1, characterized in that said main body (1) is provided with a conducting groove (107), said outlet chamber (104) being in communication with said low-pressure chamber (106) through said conducting groove (107).

10. Piloted primary gas pressure reducer as in claim 1, characterized in that said main body (1) comprises an upper cover (108) and a lower seat (109), between said upper cover (108) and said lower seat (109) there being a seventh sealing ring (10), said lower seat (109) being provided with an air inlet (22) and an air outlet (23), said air inlet (22) being in communication with said air inlet chamber (103), said air outlet (23) being in communication with said air outlet chamber (104).