35MPa heavy truck pressure reducing valve
By integrating multiple valve functions and structural innovations, the existing heavy-duty truck pressure reducing valves have been solved, and the stable pressure reduction of high-pressure gas and system safety guarantees are achieved.
Patent Information
- Application Number
- CN202411971406.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-02-14
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The output pressure of existing heavy truck pressure reducing valves is unstable under different pressures and the locking pressure is relatively high, which cannot meet the needs of high-pressure pressure reduction of large flow gases and fuel cell system scenarios above 300kW.
A 35MPa heavy truck pressure reducing valve is designed, integrating solenoid valve, replacement shutoff valve, first-stage pressure reducing valve, second-stage pressure reducing valve and overpressure relief valve, adopting a reverse unloading structure and solenoid switch to enhance pressure transmission. sense and control ability.
The stable pressure reduction of high-pressure gas is achieved, the outlet pressure stability is improved, the system cost is reduced, and the pressure bearing safety downstream of the pressure reducing valve is ensured.
Smart Images
Figure CN119435724A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of valves, and in particular relates to a 35MPa heavy-duty pressure reducing valve. Background Art
[0002] Hydrogen energy is a secondary energy source that is abundant in source, green, low-carbon and widely used. Common problems or defects of pressure reducing valves currently used in heavy trucks are: unstable output pressure under different pressures and high locking pressure.
[0003] The pressure reducing valve uses wire sealing inside, which places high demands on sealing materials. The existing pressure reducing valves cannot meet the requirements. Summary of the invention
[0004] The purpose of the present invention is to provide a 35MPa heavy-duty card pressure reducing valve, which can solve the problem of high-pressure pressure reduction of gas with large flow requirements and is suitable for fuel cell system scenarios above 300kW.
[0005] The technical solution of the present invention is as follows: a 35MPa heavy-duty card pressure reducing valve comprises a shell, an upper end face of the shell is equipped with a solenoid valve and an overpressure relief valve, the upper end face of the shell is provided with a relief port and a pressure sensor interface, the two side end faces of the shell are respectively provided with an inlet and an outlet, the front end face of the shell is provided with a replacement stop valve, the lower end of the shell is provided with a first-level pressure reducing valve and a second-level pressure reducing valve, and a waterproof breathable valve is installed on the first-level pressure reducing valve.
[0006] The shell is provided with a plurality of cavities, the inlet of the shell is provided with a cavity inside, a filter holder with a barrel-shaped structure having an opening at one end is installed in the cavity, a filter is installed in the filter holder, a filter gasket is provided at the opening of the filter, and the filter gasket is against the wall of the cavity.
[0007] A solenoid valve is installed in a cavity on the upper part of the shell, and the solenoid valve includes a solenoid valve seat. The solenoid valve seat is a columnar structure and has a columnar outer convex part. The outer convex part of the solenoid valve seat is installed in the cavity. Two annular grooves are opened on the outer convex part of the solenoid valve seat, and a second retaining ring and a third O-ring are installed in one annular groove, and a third retaining ring and a fourth O-ring are installed in one annular groove. The valve sleeve is a hollow structure with a valve core arranged at the head, and a shell head is arranged above the valve sleeve. A coil shell is arranged outside the valve sleeve and the shell head, and a coil assembly is arranged on the coil shell. The coil assembly is located between the coil shell and the solenoid valve seat. Two annular grooves are opened at the lower part of the shell head, and a retaining ring, a first O-ring, and a first retaining ring and a second O-ring are respectively installed in the annular grooves. The lower part of the shell head is also covered with a first spring, and the head of the shell head is covered with a nut.
[0008] A first-stage pressure reducing valve is installed in a cavity at the lower part of the shell. The first-stage pressure reducing valve comprises a first-stage pressure reducing valve shell, which is connected to the cavity. A fifth O-ring is arranged at the connection between the first-stage pressure reducing valve shell and the cavity. The interior of the first-stage pressure reducing valve shell is a hollow structure, in which a first-stage valve stem is sleeved. The first-stage valve stem has a rod-shaped portion, and a second spring is sleeved outside the rod-shaped portion. A sixth O-ring is sleeved outside the head of the rod-shaped portion of the first-stage valve stem, and the sixth O-ring is located between the rod-shaped portion of the first-stage valve stem and the first-stage pressure reducing valve shell. An annular groove is formed at the head of the first-stage valve stem, and a seventh O-ring is installed in the annular groove. A first-stage pressure reducing valve end cover is connected to the head of the first-stage pressure reducing valve shell, and an eighth O-ring is sleeved on the outer side of the upper part of the first-stage pressure reducing valve end cover. The first-stage pressure reducing valve end cover encapsulates the first-stage valve stem in the first-stage pressure reducing valve shell, and a first-stage pressure reducing valve cover is sleeved outside the first-stage pressure reducing valve shell, and the first-stage pressure reducing valve cover presses the pressure reducing valve end cover.
[0009] The secondary pressure reducing valve comprises a secondary pressure reducing valve housing, which is connected to the cavity, an eleventh O-ring is arranged at the connection between the secondary pressure reducing valve housing and the cavity, the interior of the secondary pressure reducing valve housing is a hollow structure, a secondary valve stem is sleeved therein, the secondary valve stem has a rod-shaped portion, a third spring is sleeved outside the rod-shaped portion, a tenth O-ring is sleeved outside the head of the rod-shaped portion of the secondary valve stem, the tenth O-ring is located between the rod-shaped portion of the secondary valve stem and the secondary pressure reducing valve housing, an annular groove is formed at the head of the secondary valve stem, a twelfth O-ring is installed in the annular groove, a secondary pressure reducing valve end cover is connected to the head of the secondary pressure reducing valve housing, a thirteenth O-ring is sleeved on the outer side of the upper part of the secondary pressure reducing valve end cover, the secondary pressure reducing valve end cover encapsulates the secondary valve stem in the secondary pressure reducing valve housing, a secondary pressure reducing valve cover is sleeved outside the secondary pressure reducing valve housing, and the secondary pressure reducing valve cover presses the secondary pressure reducing valve end cover.
[0010] The cavity on the shell with the solenoid valve installed is connected to the cavity as the inlet and the cavity with the first-stage pressure reducing valve installed through pipelines. The cavity on the shell with the second-stage pressure reducing valve installed is connected to the outlet and the cavity with the pressure sensor installed through pipelines.
[0011] A replacement stop valve is installed in a cavity on the side end face of the shell, and the replacement stop valve includes a replacement stop valve valve core, a fourteenth O-ring, a fifteenth O-ring, and a replacement stop valve seat.
[0012] An overpressure relief valve is installed in a cavity on the shell, and the overpressure relief valve includes a relief valve end cover, a sixteenth O-ring, a nut, a fourth spring, a relief valve sleeve and a relief valve core. The relief valve end cover is installed at the cavity port, an annular groove is opened on the relief valve end cover, and a sixteenth O-ring is installed in the annular groove. A nut is installed in the cavity below the relief valve end cover, and the relief valve sleeve is below the nut. A fourth spring is arranged between the relief valve sleeve and the nut. A blind hole is opened at the lower part of the relief valve sleeve, and the relief valve core is installed in the blind hole.
[0013] The cavity on the shell in which the replacement stop valve is installed is communicated with the discharge port and the cavity in which the overpressure relief valve is installed through channels.
[0014] The 35MPa heavy-duty truck pressure reducing valve as a whole integrates a solenoid valve, a replacement stop valve, a first-stage pressure reducing valve, a second-stage pressure reducing valve and an overpressure relief valve in one housing, and has the settings of double-click pressure reducing and a solenoid valve.
[0015] The beneficial effects of the present invention are as follows: the present invention has a high degree of integration, integrating functions such as a filter, a high-pressure electromagnetic switch, an overpressure relief, a manual switch, and a pressure sensor interface; the two-stage pressure reducing valve adopts a reverse unloading structure, and by machining radial holes on the two-stage valve core, the flow direction and the effective area are changed, thereby realizing control over the opening pressure and opening of the two-stage valve core and improving the outlet pressure stability; for the solenoid valve, only the coil needs to be replaced for 24V / 12V switching; an overpressure relief function is arranged downstream of the two-stage pressure reducing valve, which can reduce system piping and ensure the safety of the pressure downstream of the pressure reducing valve; the pressure reducing valve adopts an independent shell structure, which reduces the size of the valve shell material and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic diagram of a 35MPa heavy-duty pressure reducing valve provided by the present invention; Figure 2 This is a schematic diagram of the internal cross-section of a 35MPa heavy-duty card pressure reducing valve provided by the present invention; Figure 3 This is a schematic diagram of the interior of the 35MPa heavy-duty card pressure reducing valve provided by the present invention.
[0017] In the figure: 1 housing, 2 filter bracket, 3 filter, 4 filter gasket, 5 stainless steel cap nut, 6 coil housing, 7 coil assembly, 8 retaining ring, 9 first O-ring, 10 first retaining ring, 11 second O-ring, 12 housing head, 13 first spring, 14 valve sleeve, 15 valve core, 16 second retaining ring, 17 third O-ring, 18 third retaining ring, 19 fourth O-ring, 20 solenoid valve housing, 21 fifth O-ring, 22 sixth O-ring, 23 second spring, 24 first-stage pressure reducing valve housing, 25 seventh O-ring, 26 eighth O-ring, 27 first-stage valve stem, 28 first-stage pressure reducing valve housing, 29 first-stage pressure reducing valve end cover, 30 second-stage valve core, 31 ninth O-ring, 32 tenth O-ring, 33 the eleventh O-ring, 34 the third spring, 35 the secondary pressure reducing valve housing, 36 the secondary valve stem, 37 the twelfth O-ring, 38 the thirteenth O-ring, 39 the secondary pressure reducing valve cover, 40 the secondary pressure reducing valve end cover, 41 the relief valve end cover, 42 the sixteenth O-ring, 43 the nut, 44 the fourth spring, 45 the relief valve sleeve, 46 the relief valve core, 47 the replacement stop valve core, 48 the fourteenth O-ring, 49 the fifteenth O-ring, 50 the replacement stop valve seat, 51 the inlet, 52 the solenoid valve, 53 the primary pressure reducing valve, 54 the secondary pressure reducing valve, 55 the discharge port, 56 the pressure sensor, 57 the replacement stop valve, 58 the overpressure relief valve, 59 the outlet, 60 the waterproof breathable valve, 70 the pressure sensor interface. DETAILED DESCRIPTION
[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.
[0019] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0020] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, an electrical connection, a direct connection, or a connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The meaning of "multiple" in the present invention is two or more, unless otherwise clearly and specifically limited.
[0021] like Figure 1 As shown, the 35MPa heavy-duty card pressure reducing valve comprises a shell 1. The shell 1 is a block-shaped structure. A solenoid valve 52 is installed on the upper end surface of the shell 1. The upper end surface of the shell 1 is also respectively provided with a discharge port 55, a pressure sensor interface 70 and an overpressure relief valve 58. A pressure sensor 56 is installed on the pressure sensor interface 70. The two side end surfaces of the shell 1 are respectively provided with an inlet 51 and an outlet 59. The front end surface of the shell 1 is provided with a replacement stop valve 57. The lower end of the shell 1 is provided with a first-level pressure reducing valve 53 and a second-level pressure reducing valve 54. A waterproof breathable valve 60 is installed on the first-level pressure reducing valve 53.
[0022] like Figure 2As shown, a plurality of cavities are formed on the shell 1, and an inlet 51 on the shell 1 is a columnar convex structure with a cavity formed inside thereof, in which a filter holder 2 having a barrel-shaped structure with an opening at one end is installed, a filter 3 having a barrel-shaped structure is mounted inside the filter holder 2, a filter gasket 4 is provided at the opening of the filter, and the filter gasket 4 is against the wall of the cavity; a solenoid valve 52 is installed in a cavity at the upper part of the shell 1, and the solenoid valve 52 comprises a stainless steel cap nut 5, a solenoid valve shell 6, a coil assembly 7, a retaining ring 8, a first O-ring 9, a first retaining ring 10, a second O-ring 11, a shell head 12, a first spring 13, a valve sleeve 14, a valve core 15, a second retaining ring 16, a third O-ring 17, a third retaining ring 18, a fourth O-ring 19 and a solenoid valve seat 20, the solenoid valve seat 20 being a columnar structure and having a columnar outer The outer convex part of the solenoid valve seat 20 is installed in the cavity through a threaded structure. Two annular grooves are formed on the outer convex part of the solenoid valve seat 20. A second retaining ring 16 and a third O-ring 17 are installed in one annular groove, and a third retaining ring 18 and a fourth O-ring 19 are installed in one annular groove. The valve sleeve 14 is a hollow structure and a valve core 15 is arranged at the head. A shell head 12 is arranged above the valve sleeve 14. The valve sleeve 14 and the shell head 12 are covered with a coil shell 6. A coil assembly 7 is arranged on the coil shell 6. The coil assembly 7 is located between the coil shell 6 and the solenoid valve seat 20. Two annular grooves are formed at the lower part of the shell head 12. A retaining ring 8, a first O-ring 9, a first retaining ring 10 and a second O-ring 11 are respectively installed in the annular grooves. The lower part of the shell head 12 is also covered with a first spring 13, and the head of the shell head 12 is covered with a stainless steel cap nut 5.
[0023] A first-stage pressure reducing valve 53 is installed in a cavity at the lower part of the housing 1, and the first-stage pressure reducing valve 53 includes a fifth O-ring 21, a sixth O-ring 22, a second spring 23, a first-stage pressure reducing valve housing 24, a seventh O-ring 25, an eighth O-ring 26, a first-stage valve stem 27, a first-stage pressure reducing valve cover 28 and a first-stage pressure reducing valve end cover 29, and a waterproof breathable valve 60, wherein the columnar first-stage pressure reducing valve housing 24 is connected to the cavity through a threaded structure, and a fifth O-ring 21 is provided at the connection between the first-stage pressure reducing valve housing 24 and the cavity, and the interior of the first-stage pressure reducing valve housing 24 is a hollow structure, and a bolt-shaped first-stage valve stem 27 is sleeved therein, and the first-stage valve stem 27 has a rod-shaped portion, and the rod-shaped portion is sleeved outside. A second spring 23 is provided, a sixth O-ring 22 is sleeved on the head of the rod-shaped portion of the primary valve stem 27, the sixth O-ring 22 is located between the rod-shaped portion of the primary valve stem 27 and the primary pressure reducing valve housing 24, a ring groove is provided on the head of the primary valve stem 27, a seventh O-ring 25 is installed in the ring groove, a primary pressure reducing valve end cover 29 is connected to the head of the primary pressure reducing valve housing 24 through a threaded structure, an eighth O-ring 26 is sleeved on the outer side of the upper part of the primary pressure reducing valve end cover 29, the primary pressure reducing valve end cover 29 encapsulates the primary valve stem 27 in the primary pressure reducing valve housing 24, a primary pressure reducing valve cover 28 is sleeved on the outside of the primary pressure reducing valve housing 24 through a threaded structure, and the primary pressure reducing valve cover 28 presses the pressure reducing valve end cover 29.
[0024] The secondary pressure reducing valve 54 includes a ninth O-ring 31, a tenth O-ring 32, an eleventh O-ring 33, a twelfth O-ring 37, a thirteenth O-ring 38, a third spring 34, a secondary pressure reducing valve housing 35, a secondary valve stem 36, a secondary pressure reducing valve cover 39 and a secondary pressure reducing valve end cover 40, a secondary valve core 30, and a waterproof breathable valve 60. The columnar secondary pressure reducing valve housing 35 is connected to the cavity through a threaded structure, and the eleventh O-ring 33 is arranged at the connection between the secondary pressure reducing valve housing 35 and the cavity. The interior of the secondary pressure reducing valve housing 35 is a hollow structure, and a bolt-shaped secondary valve stem 36 is sleeved therein. The secondary valve stem 36 has a rod-shaped portion, and the third spring 34 is sleeved outside the rod-shaped portion. The tenth O-ring 32 is sleeved outside the head of the rod-shaped portion of the secondary valve stem 36, and the second The valve core 30 and the ninth O-ring 31 change the flow direction and the effective area by machining radial holes on the secondary valve core 30, thereby realizing the control of the opening pressure and the opening of the secondary valve core 30 and improving the stability of the outlet pressure; the tenth O-ring 32 is located between the rod-shaped portion of the secondary valve stem 36 and the secondary pressure reducing valve housing 35, and the head of the secondary valve stem 36 is provided with an annular groove, in which the twelfth O-ring 37 is installed, and the head of the secondary pressure reducing valve housing 35 is connected to the secondary pressure reducing valve end cover 40 through a threaded structure, and the outer side of the upper part of the secondary pressure reducing valve end cover 40 is sleeved with the thirteenth O-ring 38, and the secondary pressure reducing valve end cover 40 encapsulates the secondary valve stem 36 in the secondary pressure reducing valve housing 35, and the secondary pressure reducing valve cover 39 is sleeved on the outside of the secondary pressure reducing valve housing 35 through a threaded structure, and the secondary pressure reducing valve cover 39 presses the secondary pressure reducing valve end cover 40.
[0025] The cavity on the shell 1 where the solenoid valve is installed is connected to the cavity serving as the inlet and the cavity where the first-stage pressure reducing valve is installed through pipelines. The cavity on the shell 1 where the second-stage pressure reducing valve is installed is connected to the outlet and the cavity where the pressure sensor is installed through pipelines.
[0026] like Figure 3 As shown, a replacement stop valve 57 is installed in a cavity on the side end face of the housing 1, and the replacement stop valve 57 includes a replacement stop valve core 47, a fourteenth O-ring 48, a fifteenth O-ring 49, and a replacement stop valve seat 50. The replacement stop valve core 47 is arranged in the head of the replacement stop valve seat 50, and the stop valve seat 50 is covered with the fourteenth O-ring 48 and the fifteenth O-ring 49. The cavity on the housing 1 where the replacement stop valve 57 is installed is respectively connected to the cavity where the discharge port 55 is provided and the cavity where the overpressure relief valve 58 is installed, and the replacement stop valve core 47 can block the passage from the replacement stop valve 57 to the overpressure relief valve 58.
[0027] An overpressure relief valve 58 is installed in a cavity on the shell 1. The overpressure relief valve 51 includes a relief valve end cover 41, a sixteenth O-ring 42, a nut 43, a fourth spring 44, a relief valve sleeve 45 and a relief valve core 46. The relief valve end cover 41 is installed at the cavity port through a threaded structure. The relief valve end cover 41 is provided with an annular groove, in which the sixteenth O-ring 42 is installed. A nut 43 is installed in the cavity below the relief valve end cover 41. Below the nut 43 is the relief valve sleeve 45. A fourth spring 44 is provided between the relief valve sleeve 45 and the nut 43. A blind hole is provided at the lower part of the relief valve sleeve 45, in which the relief valve core 46 is installed.
[0028] The cavity on the housing 1 where the displacement stop valve 57 is installed is communicated with the discharge port 55 and the cavity where the overpressure relief valve 58 is installed through channels.
[0029] The 35MPa heavy-duty truck pressure reducing valve integrates the solenoid valve, displacement stop valve, first-stage pressure reducing, second-stage pressure reducing and overpressure relief valve in one housing, and also has the settings of double-click pressure reducing and solenoid valve.
[0030] The installation process of the present invention is as follows: Put the filter gasket 4, the filter 3 and the filter bracket 2 into the housing 1; put the third O-ring 17 / the fourth O-ring 19, the second retaining ring 16 and the third retaining ring 18 on the solenoid valve housing 20, put the valve core 15 and the first spring 13 into the solenoid valve housing 20, put the first O-ring 9 / the second O-ring 11, the retaining ring 8 / the first retaining ring 10 on the housing head, install it on the coil assembly 7, put the solenoid valve housing 20 into the housing 1, put on the coil assembly 7, screw on the stainless steel cap nut 5 to complete the assembly of the solenoid valve; embed the sixth O-ring 22 into the first-stage pressure reducing valve housing 24, put the second spring 23 and the first-stage valve stem 27 with the seventh O-ring 25 and put them into the first-stage pressure reducing valve housing 24, and the first-stage pressure reducing valve end cover 2 9 puts the eighth O-ring 26, the first-stage pressure reducing valve cover 28 is installed in the first-stage pressure reducing valve housing 24, the first-stage pressure reducing valve housing 24 is put with the fifth O-ring 21 and installed in the housing 1 to complete the first-stage pressure reducing assembly; puts the ninth O-ring 31 on the nut 30 and installs it on the second-stage valve stem 32, and assembles the second-stage pressure reducing in the same way as the first stage; embeds the relief valve core 46 into the relief valve valve sleeve, puts in the fourth spring 44, screws on the nut 43, puts the sixteenth O-ring 42 on the relief valve end cover 41 and installs it in the housing 1; puts the replacement stop valve core 47 in the replacement stop valve seat 50, puts the fourteenth O-ring 48 and the fifteenth O-ring 49 on the stop valve seat 50, and installs it in the housing 1; installs the waterproof breathable valve 60 into the first-stage pressure reducing valve housing 24.
[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. 35MPa heavy-duty pressure reducing valve, characterized by: It includes a shell, the upper end face of the shell is equipped with a solenoid valve and an overpressure relief valve, the upper end face of the shell is provided with a relief port and a pressure sensor interface, the two side end faces of the shell are respectively provided with an inlet and an outlet, the front end face of the shell is provided with a replacement stop valve, the lower end of the shell is provided with a first-level pressure reducing valve and a second-level pressure reducing valve, and a waterproof breathable valve is installed on the first-level pressure reducing valve.
2. The 35MPa heavy-duty pressure reducing valve according to claim 1, characterized in that: The shell is provided with a plurality of cavities, the inlet of the shell is provided with a cavity inside, a filter holder with a barrel-shaped structure having an opening at one end is installed in the cavity, a filter is installed in the filter holder, a filter gasket is provided at the opening of the filter, and the filter gasket is against the wall of the cavity.
3. The 35MPa heavy-duty pressure reducing valve according to claim 2, characterized in that: A solenoid valve is installed in a cavity on the upper part of the shell, and the solenoid valve includes a solenoid valve seat. The solenoid valve seat is a columnar structure and has a columnar outer convex part. The outer convex part of the solenoid valve seat is installed in the cavity. Two annular grooves are opened on the outer convex part of the solenoid valve seat, and a second retaining ring and a third O-ring are installed in one annular groove, and a third retaining ring and a fourth O-ring are installed in one annular groove. The valve sleeve is a hollow structure with a valve core arranged at the head, and a shell head is arranged above the valve sleeve. A coil shell is arranged outside the valve sleeve and the shell head, and a coil assembly is arranged on the coil shell. The coil assembly is located between the coil shell and the solenoid valve seat. Two annular grooves are opened at the lower part of the shell head, and a retaining ring, a first O-ring, and a first retaining ring and a second O-ring are respectively installed in the annular grooves. The lower part of the shell head is also covered with a first spring, and the head of the shell head is covered with a nut.
4. The 35MPa heavy-duty pressure reducing valve according to claim 2, characterized in that: A first-stage pressure reducing valve is installed in a cavity at the lower part of the shell. The first-stage pressure reducing valve comprises a first-stage pressure reducing valve shell, which is connected to the cavity. A fifth O-ring is arranged at the connection between the first-stage pressure reducing valve shell and the cavity. The interior of the first-stage pressure reducing valve shell is a hollow structure, in which a first-stage valve stem is sleeved. The first-stage valve stem has a rod-shaped portion, and a second spring is sleeved outside the rod-shaped portion. A sixth O-ring is sleeved outside the head of the rod-shaped portion of the first-stage valve stem, and the sixth O-ring is located between the rod-shaped portion of the first-stage valve stem and the first-stage pressure reducing valve shell. An annular groove is formed at the head of the first-stage valve stem, and a seventh O-ring is installed in the annular groove. A first-stage pressure reducing valve end cover is connected to the head of the first-stage pressure reducing valve shell, and an eighth O-ring is sleeved on the outer side of the upper part of the first-stage pressure reducing valve end cover. The first-stage pressure reducing valve end cover encapsulates the first-stage valve stem in the first-stage pressure reducing valve shell, and a first-stage pressure reducing valve cover is sleeved outside the first-stage pressure reducing valve shell, and the first-stage pressure reducing valve cover presses the pressure reducing valve end cover.
5. The 35MPa heavy-duty pressure reducing valve according to claim 1, characterized in that: The secondary pressure reducing valve comprises a secondary pressure reducing valve housing, which is connected to the cavity, an eleventh O-ring is arranged at the connection between the secondary pressure reducing valve housing and the cavity, the interior of the secondary pressure reducing valve housing is a hollow structure, a secondary valve stem is sleeved therein, the secondary valve stem has a rod-shaped portion, a third spring is sleeved outside the rod-shaped portion, a tenth O-ring is sleeved outside the head of the rod-shaped portion of the secondary valve stem, the tenth O-ring is located between the rod-shaped portion of the secondary valve stem and the secondary pressure reducing valve housing, an annular groove is formed at the head of the secondary valve stem, a twelfth O-ring is installed in the annular groove, a secondary pressure reducing valve end cover is connected to the head of the secondary pressure reducing valve housing, a thirteenth O-ring is sleeved on the outer side of the upper part of the secondary pressure reducing valve end cover, the secondary pressure reducing valve end cover encapsulates the secondary valve stem in the secondary pressure reducing valve housing, a secondary pressure reducing valve cover is sleeved outside the secondary pressure reducing valve housing, and the secondary pressure reducing valve cover presses the secondary pressure reducing valve end cover.
6. The 35MPa heavy-duty pressure reducing valve according to claim 2, characterized in that: The cavity on the shell with the solenoid valve installed is connected to the cavity as the inlet and the cavity with the first-stage pressure reducing valve installed through pipelines, and the cavity on the shell with the second-stage pressure reducing valve installed is connected to the outlet and the cavity with the pressure sensor installed through pipelines.
7. The 35MPa heavy-duty pressure reducing valve according to claim 2, characterized in that: A replacement stop valve is installed in a cavity on the side end face of the shell, and the replacement stop valve includes a replacement stop valve valve core, a fourteenth O-ring, a fifteenth O-ring, and a replacement stop valve seat.
8. The 35MPa heavy-duty pressure reducing valve according to claim 2, characterized in that: An overpressure relief valve is installed in a cavity on the shell, and the overpressure relief valve includes a relief valve end cover, a sixteenth O-ring, a nut, a fourth spring, a relief valve sleeve and a relief valve core. The relief valve end cover is installed at the cavity port, an annular groove is opened on the relief valve end cover, and a sixteenth O-ring is installed in the annular groove. A nut is installed in the cavity below the relief valve end cover, and the relief valve sleeve is below the nut. A fourth spring is arranged between the relief valve sleeve and the nut. A blind hole is opened at the lower part of the relief valve sleeve, and the relief valve core is installed in the blind hole.
9. The 35MPa heavy-duty pressure reducing valve according to claim 2, characterized in that: The cavity on the shell in which the replacement stop valve is installed is communicated with the discharge port and the cavity in which the overpressure relief valve is installed through channels.
10. The 35MPa heavy-duty pressure reducing valve according to claim 1, characterized in that: The 35MPa heavy-duty truck pressure reducing valve as a whole integrates a solenoid valve, a displacement stop valve, a first-stage pressure reducing valve, a second-stage pressure reducing valve and an overpressure relief valve in one housing, and has the settings of double-click pressure reducing and a solenoid valve.