A high pressure reducing ratio two-stage pressure reducing valve for an oil tank pressurization system

Abstract

A high pressure reduction ratio two-stage pressure reduction valve for an oil tank pressurization system, comprising a primary pressure reducer and a secondary pressure reducer; the primary pressure reducer is a piston type pressure reducer, comprising a main valve body, a valve seat support, a sealing assembly and a pressure regulating assembly; the main valve body is fixedly connected with the valve seat support at the valve seat position, the valve seat support is provided with a throttling hole for corresponding communication between the high pressure cavity and the low pressure cavity of the main valve body; one end of the valve seat support extends into the low pressure cavity of the main valve body, and the rod body at one end of the valve seat support located in the low pressure cavity of the main valve body is circumferentially and spacedly provided with a plurality of pressure stabilizing holes corresponding to the throttling hole of the valve seat support; the high pressure cavity of the main valve body is provided with the sealing assembly capable of closing the throttling hole of the valve seat support, and the low pressure cavity of the main valve body is provided with the pressure regulating assembly for regulating the opening degree of the throttling hole of the valve seat support; the low pressure cavity of the primary pressure reducer is in corresponding communication with the high pressure cavity of the secondary pressure reducer; the present application has the advantages of simple structure, compact layout and small size.

Description

Technical Field

[0001] This invention relates to the field of pressure reducing valve technology, and in particular to a two-stage pressure reducing valve with a high pressure reduction ratio for use in a fuel tank pressurization system. Background Technology

[0002] Commonly known two-stage pressure reducers with high pressure-reduction ratios typically employ a primary and secondary pressure reducer connected in series via pipelines. This structure often results in a complex and bulky reducer, making it unsuitable for fuel tank pressurization systems. Two-stage pressure reducers are used in many fields, such as fuel tank pressurization systems, where the key lies in the pressure regulation accuracy. Currently available two-stage pressure reducers can maintain a pressure of 5MPa for 40MPa gas after the primary stage and approximately 3.5MPa after the secondary stage, failing to meet the technical requirement of fuel tank pressurization systems to stabilize the pressure at around 0.05MPa. Therefore, those skilled in the art urgently need to develop a high-pressure-reduction-ratio two-stage pressure reducing valve for fuel tank pressurization systems, capable of stabilizing the pressure at approximately 0.05MPa.

[0003] Chinese patent (publication number: CN105042152A) discloses a high-pressure, high-flow, high-precision, compact two-stage pressure reducer. The patent includes a piston-type primary pressure reducer and a diaphragm-type secondary pressure reducer. The patent can ensure that the output is stable within the range of 3.5±0.1MPa when the inlet pressure varies within the range of 40-6MPa and the output nitrogen flow rate is less than 100g / s. However, it still cannot meet the technical requirement of the oil tank pressurization system to stabilize the pressure at around 0.05MPa. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention discloses a two-stage pressure reducing valve with a high pressure reduction ratio for an oil tank pressurization system.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0006] A high-pressure-reduction-ratio two-stage pressure reducing valve for an oil tank pressurization system includes a primary pressure reducer and a secondary pressure reducer. The primary pressure reducer is a piston-type pressure reducer, comprising a main valve body, a valve seat support, a sealing assembly, and a pressure regulating assembly. The valve seat support is securely connected to the valve seat of the main valve body, and the valve seat support has a throttling orifice that connects the high-pressure chamber and the low-pressure chamber of the main valve body. One end of the valve seat support extends into the low-pressure chamber of the main valve body, and the end of the valve seat support located in the low-pressure chamber of the main valve body has multiple pressure-stabilizing orifices arranged circumferentially at intervals, corresponding to the throttling orifices of the valve seat support. The high-pressure chamber of the main valve body has a sealing assembly capable of sealing the throttling orifices of the valve seat support, and the low-pressure chamber of the main valve body has a pressure regulating assembly for adjusting the opening of the throttling orifices of the valve seat support. The valve body of the main valve body has an air inlet connector corresponding to its high-pressure chamber. The low-pressure chamber of the primary pressure reducer is correspondingly connected to the high-pressure chamber of the secondary pressure reducer. The secondary pressure reducer is a diaphragm-type pressure reducer with a diaphragm diameter of 35±0.5mm.

[0007] Preferably, the sealing assembly includes a sealing rod movably inserted into the high-pressure chamber of the main valve body. The sealing rod has a conical structure that can close the valve seat support throttling orifice. A return spring I is provided between the end of the sealing rod away from the small end of the conical structure and the main valve body. A connecting rod that movably penetrates the valve seat support is provided at the end of the sealing rod corresponding to the small end of the conical structure. The pressure regulating assembly includes an upper valve body that communicates with the low-pressure chamber of the main valve body and a piston that movably cooperates with the low-pressure chamber of the main valve body. The piston axis is parallel to the sealing rod axis. A spring with one end in contact with the piston is provided in the upper valve body. A pressure regulating stud for adjusting the spring pressure is threaded to the end of the upper valve body away from the main valve body. The end of the piston away from the spring is in contact with the sealing rod connecting rod.

[0008] Preferably, a sealing seat that can be adapted to the conical structure of the sealing rod is provided between the main valve body seat and the valve seat support.

[0009] Preferably, one end of the pressure regulating stud extends out of the upper valve body, and a locking nut is threadedly connected to the extended end of the pressure regulating stud.

[0010] Preferably, a sealing gasket is provided between the air inlet connector and the main valve body, and one end of the air inlet connector is located in a countersunk hole. The countersunk hole is provided with a filter assembly for filtering the air inlet channel of the air inlet connector, and a clamping screw for tightening the filter assembly.

[0011] Preferably, the secondary pressure reducer includes a valve body that is fastened to one side of the main valve body, a cavity that communicates with the low-pressure chamber of the main valve body on one side of the main valve body, an air inlet channel that communicates with the high-pressure chamber of the valve body at the position corresponding to the cavity, and a sealing mechanism that can seal the air inlet channel. A pressure regulating mechanism for adjusting the air inlet channel is provided on the side of the valve body away from the main valve body. The valve body is provided with an output connector that communicates with the low-pressure chamber of the valve body.

[0012] Preferably, the sealing mechanism includes a return spring seat that is fastened to the valve body. A sealing rod assembly is movably inserted into the return spring seat. The sealing rod assembly has an annular boss on its shaft that can close the air intake passage of the valve body. A return spring is provided on the shaft of the sealing rod assembly corresponding to the annular boss and the return spring seat. A through hole is provided between the high-pressure chamber and the low-pressure chamber of the valve body, and the end of the sealing rod assembly away from the return spring is movably inserted into the through hole. The pressure regulating mechanism includes a valve cover that is fastened to the valve body. A diaphragm is provided between the valve body and the valve cover. The chamber between the diaphragm and the valve body is correspondingly connected to the low-pressure chamber of the valve body. A top rod that is movably inserted into the valve body is provided between the sealing rod assembly and the diaphragm. A pressure regulating spring seat that abuts against the diaphragm is provided at one end inside the valve cover. A spring cover is slidably fitted at the other end inside the valve cover. A pressure regulating spring is provided between the spring cover and the pressure regulating spring seat. A pressure regulating rod that abuts against the spring cover is threaded to one end of the valve cover.

[0013] Preferably, one end of the pressure regulating rod extends out of the valve cover, and the extended end of the pressure regulating rod is threadedly connected with a set nut.

[0014] Preferably, the spring cover has a spherical groove at one end corresponding to the pressure adjusting rod, and the pressure adjusting rod has a ball head structure that is compatible with the spherical groove.

[0015] Preferably, the low-pressure chamber of the secondary pressure reducer is connected to a safety valve.

[0016] By employing the technical solution described above, the present invention has the following beneficial effects:

[0017] This invention discloses a high pressure reduction ratio two-stage pressure reducing valve for an oil tank pressurization system. It features a simple structure, compact layout, and small size. A valve seat support is securely connected to the main valve body, and the valve seat support has throttling orifices that connect the high-pressure chamber and low-pressure chamber of the main valve body. One end of the valve seat support extends into the low-pressure chamber of the main valve body, and the end of the valve seat support located in the low-pressure chamber has multiple pressure-stabilizing orifices spaced circumferentially along its shaft, corresponding to the throttling orifices of the valve seat support. The high-pressure chamber of the main valve body connects to its low-pressure chamber through the throttling orifices and pressure-stabilizing orifices of the valve seat support. The axes of the throttling orifices and pressure-stabilizing orifices intersect, achieving flow diversion and effectively ensuring pressure stability within the low-pressure chamber of the main valve body. Attached Figure Description

[0018] Fig. 1 This is a schematic diagram of the structure of the present invention;

[0019] Fig. 2 This is a schematic diagram of the structure of a primary pressure reducer;

[0020] Fig. 3 This is a schematic diagram of a two-stage pressure reducer;

[0021] Fig. 4This is a schematic diagram of the connection structure between the first-stage pressure reducer and the second-stage pressure reducer.

[0022] In the diagram: 1. Primary pressure reducer; 1-1. Pressure regulating stud; 1-2. Locking nut; 1-3. Upper valve body; 1-4. Spring; 1-5. Main valve body; 1-6. Piston; 1-7. Valve seat support; 1-8. Sealing seat; 1-9. Sealing gasket; 1-10. Sealing rod; 1-11. Inlet connector; 1-12. Filter assembly; 1-13. Clamping screw; 1-14. Return spring; 2. Secondary pressure reducer; 2-1. Set nut; 2-2. Pressure regulating rod; 2-3. Valve cover; 2-4. Spring cover; 2-5. Pressure regulating spring; 2-6. Valve body; 2-7. Pressure regulating spring seat; 2-8. Diaphragm; 2-9. Push rod; 2-10. Output connector; 2-11. Return spring seat; 2-12. Return spring II; 2-13. Sealing rod assembly. Detailed Implementation

[0023] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation.

[0024] Example 1, in conjunction with Appendix Figs. 1-2 A high pressure reduction ratio two-stage pressure reducing valve for an oil tank pressurization system includes a first-stage pressure reducing device 1 and a second-stage pressure reducing device 2; the first-stage pressure reducing device 1 is a piston-type pressure reducing device, which includes a main valve body 1-5, a valve seat support 1-7, a sealing assembly, and a pressure regulating assembly.

[0025] The main valve body 1-5 is fastened to the valve seat with a valve seat support 1-7. The valve seat support 1-7 is provided with a throttling orifice that connects the high-pressure chamber and the low-pressure chamber of the main valve body 1-5. One end of the valve seat support 1-7 extends into the low-pressure chamber of the main valve body 1-5, and the rod of the valve seat support 1-7 located in the low-pressure chamber of the main valve body 1-5 is provided with multiple pressure stabilizing orifices that are connected to the throttling orifice of the valve seat support 1-7 at intervals along the circumference. That is, the high-pressure chamber of the main valve body 1-5 is connected to its low-pressure chamber through the throttling orifice and pressure stabilizing orifice of the valve seat support 1-7. The axes of the throttling orifice and the pressure stabilizing orifice intersect, which can achieve the purpose of flow diversion and effectively ensure the pressure stability in the low-pressure chamber of the main valve body 1-5.

[0026] The main valve body 1-5 has a sealing assembly in its high-pressure chamber that can seal the throttling orifice of the valve seat support 1-7, and a pressure regulating assembly in its low-pressure chamber for adjusting the opening of the throttling orifice of the valve seat support 1-7. The main valve body 1-5 has an inlet connector 1-11 that communicates with its high-pressure chamber, allowing high-pressure gas from the gas cylinder to enter the high-pressure chamber of the main valve body 1-5 through the inlet connector 1-11, and then flow along the throttling orifice gap between the valve seat support 1-7 and the sealing assembly, as well as the pressure regulating orifice. When the pressure in the low-pressure chamber of the main valve body 1-5 increases, the pressure regulating component drives the sealing component to operate, causing the opening of the throttle orifice of valve seat support 1-7 to decrease, thereby reducing the pressure in the low-pressure chamber of the main valve body 1-5. When the pressure in the low-pressure chamber of the main valve body 1-5 decreases, the pressure regulating component drives the sealing component to operate in the opposite direction, causing the opening of the throttle orifice of valve seat support 1-7 to increase, thereby increasing the pressure in the low-pressure chamber of the main valve body 1-5, thus keeping the pressure in the low-pressure chamber of the main valve body 1-5 stable.

[0027] The low-pressure chamber of the primary pressure reducer 1 is connected to the high-pressure chamber of the secondary pressure reducer 2. The secondary pressure reducer 2 is a diaphragm type pressure reducer with a diaphragm diameter of 35±0.5mm. The diaphragm diameter directly affects the pressure regulation accuracy of the secondary pressure reducer 2. The high-pressure gas in the gas cylinder, which is 3MPa to 50MPa, is reduced to 1MPa after passing through the primary pressure reducer 1. After passing through the secondary pressure reducer 2, the outlet pressure can be stabilized at about 0.05MPa.

[0028] Example 2, in conjunction with Appendix Figs. 1-2 A high pressure reduction ratio two-stage pressure reducing valve for an oil tank pressurization system differs from Embodiment 1 in that, based on Embodiment 1, the sealing assembly includes a sealing rod 1-10 movably inserted into the high-pressure chamber of the main valve body 1-5. The sealing rod 1-10 has a conical structure that can close the throttling orifice of the valve seat support 1-7. That is, the conical structure can be inserted into the throttling orifice of the valve seat support 1-7, thereby sealing the throttling orifice of the valve seat support 1-7. When there is a gap between the conical structure and the throttling orifice of the valve seat support 1-7, the throttling orifice of the valve seat support 1-7 opens, allowing the high-pressure chamber of the main valve body 1-5 to communicate with the low-pressure chamber. A return spring I1-14 is provided between the end of the sealing rod 1-10 away from the small end of the conical structure and the main valve body 1-5. A connecting rod that movably passes through the valve seat support 1-7 is provided at the end of the sealing rod 1-10 corresponding to the small end of its conical structure. That is, the sealing rod 1-10 can move upward under the action of the return spring I1-14, reducing the opening of the throttling orifice of the valve seat support 1-7.

[0029] The pressure regulating assembly includes an upper valve body 1-3 that communicates with the low-pressure chamber of the main valve body 1-5 and a piston 1-6 that is movably fitted with the low-pressure chamber of the main valve body 1-5. The axis of the piston 1-6 is parallel to the axis of the sealing rod 1-10. The upper valve body 1-3 is provided with a spring 1-4, one end of which abuts against the piston 1-6. The end of the upper valve body 1-3 away from the main valve body 1-5 is threaded with a pressure regulating stud 1-1 for adjusting the pressure of the spring 1-4. The end of the piston 1-6 away from the spring 1-4 abuts against the connecting rod of the sealing rod 1-10, that is, the pressure regulating stud 1-1 can be turned. The pressure regulating stud 1-1 compresses the spring 1-4, and the spring 1-4 abuts against the piston 1-6, causing the piston 1-6 to push the sealing rod 1-10 down, thereby increasing the opening of the throttling orifice of the valve seat support 1-7.

[0030] When the pressure in the low-pressure chamber of the main valve body 1-5 increases, the piston 1-6 moves upward, and the sealing rod 1-10 moves upward under the action of the return spring I 1-14, which reduces the opening of the throttling orifice of the valve seat support 1-7 and reduces the pressure in the low-pressure chamber of the main valve body 1-5; when the pressure in the low-pressure chamber of the main valve body 1-5 decreases, the spring 1-4 abuts against the piston 1-6, which pushes the sealing rod 1-10 downward, which increases the opening of the throttling orifice of the valve seat support 1-7 and increases the pressure in the low-pressure chamber of the main valve body 1-5.

[0031] A sealing seat 1-8 is provided between the main valve body 1-5 valve seat and the valve seat support 1-7, which can be adapted to the conical structure of the sealing rod 1-10, so as to ensure the accuracy of the throttling orifice opening of the valve seat support 1-7.

[0032] One end of the pressure regulating stud 1-1 extends out of the upper valve body 1-3, and the extended end of the pressure regulating stud 1-1 is threadedly connected to a locking nut 1-2. That is, when the pressure regulating stud 1-1 is adjusted to the correct position, the pressure regulating stud 1-1 can be locked by the locking nut 1-2 to prevent the pressure regulating stud 1-1 from loosening accidentally and to ensure the reliability of the pressure regulation of the first-stage pressure reducer 1.

[0033] A sealing gasket 1-9 is provided between the air inlet connector 1-11 and the main valve body 1-5 to improve the sealing performance; one end of the air inlet connector 1-11 is located in a countersunk hole, which contains a filter assembly 1-12 for filtering the air inlet channel of the air inlet connector 1-11, and a clamping screw 1-13 for clamping the filter assembly 1-12, which can effectively prevent foreign objects from entering the high-pressure chamber of the main valve body 1-5.

[0034] Example 3, in conjunction with Appendix Figs. 1-4A high pressure reduction ratio two-stage pressure reducing valve for an oil tank pressurization system, based on embodiment 1 or 2, wherein the secondary pressure reducing device 2 includes a valve body 2-6 that is fastened to one side of the main valve body 1-5. The main valve body 1-5 has a cavity corresponding to the low-pressure chamber of the main valve body 1-5 on one side corresponding to the valve body 2-6. The valve body 2-6 has an air intake channel corresponding to the high-pressure chamber of the valve body 2-6 at the position corresponding to the cavity, and a sealing mechanism that can seal the air intake channel. That is, the sealing mechanism of the secondary pressure reducing device 2 can be hidden inside the main valve body 1-5, effectively reducing the overall volume and making the layout compact and reasonable.

[0035] The valve body 2-6 is provided with a pressure regulating mechanism for adjusting the air intake passage on the side opposite to the main valve body 1-5; the valve body 2-6 is provided with an output connector 2-10 that is connected to the low-pressure chamber of the valve body 2-6, that is, the gas medium that has been reduced in pressure by the secondary pressure reducer 2 can be output from the output connector 2-10.

[0036] The sealing mechanism includes a return spring seat 2-11 that is fastened to the valve body 2-6. A sealing rod assembly 2-13 is movably inserted into the return spring seat 2-11. The sealing rod assembly 2-13 has an annular boss that can close the air intake passage of the valve body 2-6. A return spring 2-12 is provided on the rod of the sealing rod assembly 2-13 between the annular boss and the return spring seat 2-11. That is, the return spring 2-12 can push the sealing rod assembly 2-13 to the right, thereby reducing the opening of the air intake passage of the valve body 2-6 through the annular boss.

[0037] A through hole is provided between the high-pressure chamber and the low-pressure chamber of the valve body 2-6, and one end of the sealing rod assembly 2-13 away from the return spring 2-12 is movably inserted into the through hole; the pressure regulating mechanism includes a valve cover 2-2 that is correspondingly and fastened to the valve body 2-6, a diaphragm 2-8 is provided between the valve body 2-6 and the valve cover 2-2, and the chamber between the diaphragm 2-8 and the valve body 2-6 is correspondingly connected to the low-pressure chamber of the valve body 2-6, that is, the diaphragm 2-8 can be subjected to the pressure of the gas medium in the low-pressure chamber of the valve body 2-6;

[0038] A push rod 2-9 is provided between the sealing rod assembly 2-13 and the diaphragm 2-8, which is movably inserted into the valve body 2-6; one end of the valve cover 2-2 is provided with a pressure regulating spring seat 2-7 that corresponds to and abuts against the diaphragm 2-8, and the other end of the valve cover 2-2 is slidably fitted with a spring cover 2-3. A pressure regulating spring 2-5 is provided between the spring cover 2-3 and the pressure regulating spring seat 2-7; one end of the valve cover 2-2 corresponding to the spring cover 2-3 is threadedly connected to a pressure regulating rod 2-2 that corresponds to and abuts against the spring cover 2-3. That is, by turning the pressure regulating rod 2-2, the pressure regulating rod 2-2 can push the spring cover 2-3 to the left, the spring cover 2-3 compresses the pressure regulating spring 2-5, the pressure regulating spring 2-5 pushes the pressure regulating spring seat 2-7, and then pushes the diaphragm 2-8 to the left. The diaphragm 2-8 pushes the sealing rod assembly 2-13 to the left through the push rod 2-9, increasing the opening of the air intake channel of the valve body 2-6;

[0039] When the pressure in the low-pressure chamber of valve body 2-6 increases, diaphragm 2-8 moves to the right, and sealing rod assembly 2-13, under the action of return spring 2-12, pushes sealing rod assembly 2-13 to the right, reducing the opening of air intake channel of valve body 2-6 and lowering the pressure in the low-pressure chamber of valve body 2-6; when the pressure in the low-pressure chamber of valve body 2-6 decreases, pressure regulating spring 2-5 pushes pressure regulating spring seat 2-7, which in turn pushes diaphragm 2-8 to the left, and diaphragm 2-8 pushes sealing rod assembly 2-13 to the left through push rod 2-9, increasing the opening of air intake channel of valve body 2-6 and increasing the pressure in the low-pressure chamber of valve body 2-6;

[0040] One end of the pressure regulating rod 2-2 extends out of the valve cover 2-2, and the extended end of the pressure regulating rod 2-2 is threadedly connected to the set nut 2-1. That is, after the pressure regulating rod 2-2 is adjusted to the position, it can be locked by the set nut 2-1, thereby ensuring the reliability of the pressure regulation of the secondary pressure reducer 2.

[0041] The spring cover 2-3 has a spherical groove at one end corresponding to the pressure adjusting rod 2-2, and the pressure adjusting rod 2-2 has a ball head structure that is compatible with the spherical groove, which can ensure the flexibility of the spring cover 2-3.

[0042] Example 4, in conjunction with Appendix Figs. 1-4 A high pressure reduction ratio two-stage pressure reducing valve for an oil tank pressurization system, based on any of the embodiments 1 to 3, wherein the low-pressure chamber of the second-stage pressure reducer 2 is connected to a safety valve, which can effectively improve safety.

[0043] The parts of this invention not described in detail are prior art. It will be apparent to those skilled in the art that this invention is not limited to the details of the above exemplary embodiments, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and are intended to encompass all changes falling within the meaning and scope of equivalents within this invention.

Claims

1. A two-stage pressure reducing valve with a high pressure reduction ratio for an oil tank pressurization system, characterized in that: It includes a primary pressure reducer (1) and a secondary pressure reducer (2); the primary pressure reducer (1) is a piston-type pressure reducer, which includes a main valve body (1-5), a valve seat support (1-7), a sealing assembly, and a pressure regulating assembly; the valve seat support (1-7) is fastened to the valve seat of the main valve body (1-5), and the valve seat support (1-7) is provided with a throttling orifice that connects the high-pressure chamber and the low-pressure chamber of the main valve body (1-5); one end of the valve seat support (1-7) extends into the low-pressure chamber of the main valve body (1-5), and the rod of the valve seat support (1-7) located in the low-pressure chamber of the main valve body (1-5) is arranged circumferentially at intervals. There are multiple pressure stabilizing holes that are connected to the throttling holes of the valve seat support (1-7); the high-pressure chamber of the main valve body (1-5) is provided with a sealing assembly that can close the throttling holes of the valve seat support (1-7), and the low-pressure chamber of the main valve body (1-5) is provided with a pressure regulating assembly for adjusting the opening of the throttling holes of the valve seat support (1-7); the valve body of the main valve body (1-5) is provided with an air inlet connector (1-11) that is connected to its high-pressure chamber; the low-pressure chamber of the first-stage pressure reducer (1) is connected to the high-pressure chamber of the second-stage pressure reducer (2), and the second-stage pressure reducer (2) is a diaphragm pressure reducer with a diaphragm diameter of 35±0.5mm; The sealing assembly includes a sealing rod (1-10) movably inserted into the high-pressure chamber of the main valve body (1-5). The sealing rod (1-10) has a conical structure on its body that can close the throttling orifice of the valve seat support (1-7). A return spring I (1-14) is provided between the end of the sealing rod (1-10) away from the small end of the conical structure and the main valve body (1-5). A connecting rod that movably passes through the valve seat support (1-7) is provided at the end of the sealing rod (1-10) corresponding to the small end of its conical structure. The pressure regulating assembly includes a corresponding connecting rod to the low-pressure chamber of the main valve body (1-5). The upper valve body (1-3) is connected to the piston (1-6) which is movable and cooperates with the low-pressure chamber of the main valve body (1-5). The axis of the piston (1-6) is parallel to the axis of the sealing rod (1-10). The upper valve body (1-3) is provided with a spring (1-4) whose end is in contact with the piston (1-6). The end of the upper valve body (1-3) away from the main valve body (1-5) is threaded with a pressure adjusting stud (1-1) for adjusting the pressure of the spring (1-4). The end of the piston (1-6) away from the spring (1-4) is in contact with the connecting rod of the sealing rod (1-10).

2. The high pressure reduction ratio two-stage pressure reducing valve for the oil tank pressurization system as described in claim 1, characterized in that: The main valve body (1-5) has a sealing seat (1-8) between the valve seat and the valve seat support (1-7) that can be adapted to the conical structure of the sealing rod (1-10).

3. The high pressure reduction ratio two-stage pressure reducing valve for the oil tank pressurization system as described in claim 1, characterized in that: One end of the pressure regulating stud (1-1) extends out of the upper valve body (1-3), and the extended end of the pressure regulating stud (1-1) is threadedly connected to a locking nut (1-2).

4. The high pressure reduction ratio two-stage pressure reducing valve for the oil tank pressurization system as described in claim 1, characterized in that: A sealing gasket (1-9) is provided between the air inlet connector (1-11) and the main valve body (1-5). One end of the air inlet connector (1-11) is located in a countersunk hole. The countersunk hole contains a filter assembly (1-12) for filtering the air inlet channel of the air inlet connector (1-11) and a clamping screw (1-13) for clamping the filter assembly (1-12).

5. The high pressure reduction ratio two-stage pressure reducing valve for the oil tank pressurization system as described in claim 1, characterized in that: The secondary pressure reducer (2) includes a valve body (2-6) that is fastened to one side of the main valve body (1-5). The main valve body (1-5) has a cavity corresponding to the low-pressure chamber of the main valve body (1-5) on one side. The valve body (2-6) has an air inlet channel corresponding to the high-pressure chamber of the valve body (2-6) at the position corresponding to the cavity, and a sealing mechanism that can seal the air inlet channel. The valve body (2-6) has a pressure regulating mechanism for adjusting the air inlet channel on the side away from the main valve body (1-5). The valve body (2-6) has an output connector (2-10) corresponding to the low-pressure chamber of the valve body (2-6).

6. The high pressure reduction ratio two-stage pressure reducing valve for the oil tank pressurization system as described in claim 5, characterized in that: The sealing mechanism includes a return spring seat (2-11) correspondingly and fastened to the valve body (2-6). A sealing rod assembly (2-13) is movably inserted into the return spring seat (2-11). The sealing rod assembly (2-13) has an annular boss on its shaft that can close the air intake passage of the valve body (2-6). A return spring (2-12) is provided on the shaft of the sealing rod assembly (2-13) corresponding to the annular boss and the return spring seat (2-11). A through hole is provided between the high-pressure chamber and the low-pressure chamber of the valve body (2-6), and one end of the sealing rod assembly (2-13) away from the return spring (2-12) is movably inserted into this through hole. The pressure regulating mechanism includes a valve cover (2-3) correspondingly and fastened to the valve body (2-6). The valve body (2-6) and the valve... A diaphragm (2-8) is provided between the cover (2-3), and the chamber between the diaphragm (2-8) and the valve body (2-6) is connected to the low-pressure chamber of the valve body (2-6); a top rod (2-9) is provided between the sealing rod assembly (2-13) and the diaphragm (2-8) and is movably inserted into the valve body (2-6); a pressure regulating spring seat (2-7) is provided at one end of the valve cover (2-3) and abuts against the diaphragm (2-8), and a spring cover (2-4) is slidably fitted at the other end of the valve cover (2-3), and a pressure regulating spring (2-5) is provided between the spring cover (2-4) and the pressure regulating spring seat (2-7); a pressure regulating rod (2-2) is threadedly connected to one end of the valve cover (2-3) corresponding to the spring cover (2-4) and abuts against the spring cover (2-4).

7. The high pressure reduction ratio two-stage pressure reducing valve for the oil tank pressurization system as described in claim 6, characterized in that: One end of the pressure regulating rod (2-2) extends out of the valve cover (2-3), and the extended end of the pressure regulating rod (2-2) is threadedly connected to a set nut (2-1).

8. The high pressure reduction ratio two-stage pressure reducing valve for the oil tank pressurization system as described in claim 7, characterized in that: The spring cover (2-4) has a spherical groove at one end corresponding to the pressure adjusting rod (2-2), and the pressure adjusting rod (2-2) has a ball head structure that is compatible with the spherical groove.

9. The high pressure reduction ratio two-stage pressure reducing valve for the oil tank pressurization system as described in claim 1, characterized in that: The low-pressure chamber of the secondary pressure reducer (2) is connected to a safety valve.

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