Large flow pilot operated solenoid valve

Abstract

The application discloses a large-flow pilot electromagnetic valve, comprising a pilot valve, a main valve and a stainless steel pipe; wherein the main valve is provided with an air inlet, an air outlet and a discharge port; the electromagnetic valve controls gas and air supply of the main valve in common, and the gas of the air inlet of the main valve is introduced into the pilot valve through the stainless steel pipe. The large-flow pilot electromagnetic valve has the advantages of large flow, low power consumption, good sealing performance, high pressure resistance, fast response speed, long service life, high reliability and the like, and is suitable for a low-power-consumption, large-flow, high-pressure air path control system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electromagnetic valve design, and particularly relates to a large-flow pilot electromagnetic valve. BACKGROUND

[0002] The main defects of the existing pilot electromagnetic valve products are slow response speed, poor sealing performance, easy wear of the sealing element, and low pressure resistance level. Therefore, it is urgent to develop a pilot electromagnetic valve with large flow, fast response, good sealing performance, and long service life to meet the needs of the gas control system of various industries. SUMMARY

[0003] The application overcomes the defects of the prior art and provides a large-flow pilot electromagnetic valve with the advantages of large flow, low power consumption, good sealing performance, high pressure resistance, fast response speed, long service life, and high reliability, and is suitable for low-power, large-flow, and high-pressure gas control systems.

[0004] In order to solve the above technical problems, the application discloses a large-flow pilot electromagnetic valve, which comprises a pilot valve, a main valve, and a stainless steel pipe.

[0005] In the large-flow pilot electromagnetic valve, the main valve comprises a main valve seat, a main valve body, a main valve reversing valve core assembly, a reversing piston, a valve cover, a main valve return spring, an end cover, and an annular sealing element. The main valve body is installed on the main valve seat and is encapsulated by the valve cover and the end cover. The main valve reversing valve core assembly is installed in the inner cavity of the main valve body through the annular sealing element. The main valve return spring and the reversing piston are arranged in the inner cavity of the main valve body and are respectively located at the left and right ends of the main valve reversing valve core assembly. The pilot valve is connected to the valve cover by a screw.

[0006] In the large-flow pilot electromagnetic valve, the main valve reversing valve core assembly comprises a shaft, a locking nut, a lock washer, a copper washer, an end face sealing ring, a positioning valve core, and a valve core sealing gasket. The lock washer, the copper washer, the end face sealing ring, and the positioning valve core are sleeved on the shaft. Two end face sealing rings are arranged at the left and right ends of the positioning valve core and are locked by the locking nut. The lock washer and the copper washer are arranged between the locking nut and the end face sealing ring. The valve core sealing gasket is of a special shape and is bonded in the annular groove of the end face sealing ring by a vulcanization process.

[0007] In the above large flow pilot electromagnetic valve, the pilot valve comprises a pilot valve body, a manual switch, an O-shaped sealing ring, an electromagnetic coil, a static valve core assembly, a lock nut, a dynamic valve core assembly, a pilot valve return spring and an air inlet valve nozzle; wherein the electromagnetic coil is located at the upper part of the pilot valve body, and the top end is provided with an opening; the static valve core assembly is screwed into the pilot valve body through the lower end thread, and forms a pilot valve valve cavity together with the pilot valve body; the O-shaped sealing ring is installed in the annular groove at the lower end thread of the static valve core assembly, and contacts the side wall of the inner hole of the pilot valve body to realize sealing and prevent gas leakage from the pilot valve valve cavity; the top end of the static valve core assembly extends out of the electromagnetic coil through the opening at the top end of the electromagnetic coil; the part of the static valve core assembly extending out of the electromagnetic coil is a threaded structure, which is used to connect the lock nut and press the electromagnetic coil and the pilot valve body by tightening the lock nut; the bottom end of the static valve core assembly is provided with a cylindrical through hole with a lower end opening, and the dynamic valve core assembly is installed in the cylindrical through hole; the lower end of the dynamic valve core assembly is a conical structure, and the pilot valve return spring is a conical spring; one end of the pilot valve return spring is sleeved on the conical structure at the lower end of the dynamic valve core assembly and is limited by the conical structure at the lower end of the dynamic valve core assembly; the other end of the pilot valve return spring contacts the static valve core assembly, and the static valve core assembly pre-tightens and compresses the pilot valve return spring; the pilot valve return spring applies a spring force to the dynamic valve core assembly, so that the bottom end of the dynamic valve core assembly contacts the air inlet valve nozzle and abuts against the control gas inlet A arranged at the bottom of the pilot valve body; a cylindrical stepped hole is arranged in the central part of the inner cavity of the pilot valve body, which is used to install the air inlet valve nozzle; the air inlet valve nozzle is in interference fit with the pilot valve body, and the fitting surface is coated with sealing glue to prevent gas leakage; the manual switch is installed in the pilot valve body through the cylindrical hole on the right side of the pilot valve body, and the lower end ring of the static valve core assembly clamps the manual switch to prevent it from falling out.

[0008] In the above large flow pilot operated solenoid valve, the main valve seat is provided with connection port I, connection port M, discharge port N, connection port O, connection port P and connection port Q; the main valve body is provided with connection port G, connection port H, connection port J, connection port K and connection port L; the valve cover is provided with connection port II, connection port E and connection port F; the pilot valve body bottom is provided with control gas inlet A and control gas outlet B; the static valve core assembly top end middle part is provided with discharge port C which communicates with the outside; wherein, one end of the stainless steel pipe is connected with connection port I through a straight-through sleeve, and the other end is connected with connection port II through a straight-through sleeve, so as to introduce the gas of the inlet into the valve cover inner cavity; control gas inlet A and control gas outlet B both communicate with the pilot valve cavity; the upper side of connection port E communicates with control gas inlet A, and the lower side communicates with the valve cover inner cavity; the upper side of connection port F communicates with control gas outlet B, and the lower side communicates with connection port G; so that the control gas enters the piston cavity on the right side of the reversing piston, and the reversing purpose is achieved; connection port H communicates with connection port M and discharge port N, and finally realizes communication with the outside atmosphere; connection port J communicates with connection port O and the inlet; connection port K communicates with connection port P and the outlet; connection port L communicates with connection port Q and the discharge port.

[0009] In the above large flow pilot operated solenoid valve, the moving valve core assembly comprises: moving valve core, buffer spring, exhaust port sealing gasket and inlet sealing gasket; wherein, the upper end of the moving valve core is provided with a special-shaped cavity, the side surface is provided with a through hole, and the lower end is provided with a dovetail groove; the inlet sealing gasket is pasted in the dovetail groove of the moving valve core through vulcanization process; the buffer spring is located in the cavity inside the moving valve core and is placed below the exhaust port sealing gasket; the exhaust port sealing gasket is pressed into the special-shaped cavity inside the moving valve core, one end compresses the buffer spring, and the other end tightly abuts the upper end boss to prevent the exhaust port sealing gasket from falling off.

[0010] In the above large flow pilot operated solenoid valve, the inlet sealing gasket is used to contact the blade of the inlet valve nozzle when the large flow pilot operated solenoid valve is in the "off" state, and forms a seal; the exhaust port sealing gasket is used to contact the blade of the static valve core assembly when the large flow pilot operated solenoid valve is in the "on" state, and forms a seal.

[0011] In the above large flow pilot operated solenoid valve, the buffer spring is used to compress and displace when the external force acting on the exhaust port sealing gasket is greater than the set sealing spring force, so as to realize buffering and prevent the stress acting on the exhaust port sealing gasket from being too large, thereby avoiding damage to the exhaust port sealing gasket.

[0012] In the above large flow pilot operated solenoid valve, a plurality of flow guide grooves are opened on the cylindrical surface of the moving valve core, which are used to communicate the control gas outlet B and the discharge port C.

[0013] In the above large flow pilot electromagnetic valve, when the electromagnetic coil fails or there is no power supply condition: if the electromagnetic valve needs to be opened, the manual switch is manually operated to rotate 180° clockwise, so that the electromagnetic valve is opened, and the control gas inlet A and the control gas outlet B are communicated; if the electromagnetic valve needs to be closed, the manual switch is manually operated to rotate 180° counterclockwise, so that the electromagnetic valve is closed, the control gas inlet A is cut off, and the control gas outlet B and the discharge port C are communicated.

[0014] The present application has the following advantages:

[0015] (1) The present application discloses a large flow pilot electromagnetic valve, which has the advantages of large flow, low power consumption, good sealing performance, high pressure resistance, fast response speed, long service life, high reliability, etc., and is suitable for low-power, large-flow and high-pressure gas path control systems.

[0016] (2) The present application discloses a large flow pilot electromagnetic valve, which adopts axial soft seat sealing (sealing formed by the blade edge of the valve core sealing pad and the main valve body) between the main valve reversing valve core assembly and the main valve body, and provides sealing force through the main valve return spring and the working gas pressure difference. The valve core sealing pad does not produce wear during switching, and reliable sealing can be achieved for multiple switching, and the service life is long.

[0017] (3) The present application discloses a large flow pilot electromagnetic valve, which assembles the anti-loose gasket, the copper gasket, the end face sealing ring and the positioning valve core on the same shaft, ensures the axial coaxiality, reduces the probability of jamming during the movement of the main valve reversing valve core assembly, and is easy to maintain.

[0018] (4) The present application discloses a large flow pilot electromagnetic valve, which is provided with a manual switch, and when the electromagnetic coil fails or there is no power supply condition, the manual switch can be manually rotated to realize the opening / closing operation of the pilot electromagnetic valve. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of a large flow pilot electromagnetic valve in an embodiment of the present application;

[0020] Figure 2 is a structural schematic view of a main valve in an embodiment of the present application;

[0021] Figure 3 is a structural schematic view of a main valve reversing valve core assembly in an embodiment of the present application;

[0022] Figure 4 is a structural schematic view of a valve cover in an embodiment of the present application;

[0023] Figure 5 is a structural schematic view of a main valve body in an embodiment of the present application;

[0024] Figure 6 is a structural schematic diagram of a pilot valve in an embodiment of the present application;

[0025] Figure 7 is a structural schematic diagram of a moving spool assembly in an embodiment of the present application;

[0026] Figure 8 is a structural schematic diagram of a main valve seat in an embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear, the disclosed embodiments of the present application will be further described in detail below with reference to the drawings.

[0028] Referring to Figure 1 In the present embodiment, the large-flow pilot electromagnetic valve comprises a pilot valve 1, a main valve 2 and a stainless steel pipe 3. The main valve 2 is provided with an air inlet 4, a discharge port 5 and an air outlet 6. The electromagnetic valve control gas is shared with the main valve gas supply. The gas in the air inlet 4 is introduced into the pilot valve 1 through the stainless steel pipe 3 to realize the function of the large-flow pilot electromagnetic valve.

[0029] In the present embodiment, as shown in Figure 2 , the main valve 2 mainly comprises a main valve seat 201, a main valve body 202, a main valve reversing spool assembly 203, a reversing piston 204, a valve cover 205, a main valve return spring 206, an end cover 207 and an annular sealing member 209. The main valve body 202 is installed on the main valve seat 201 and is encapsulated by the valve cover 205 and the end cover 207. The main valve reversing spool assembly 203 is installed in the inner cavity of the main valve body 202 through the annular sealing member 209. The main valve return spring 206 and the reversing piston 204 are arranged in the inner cavity of the main valve body 202 and are respectively located at the left and right ends of the main valve reversing spool assembly 203. The pilot valve 1 is connected with the valve cover 205 by screws.

[0030] Preferably, as Figure 3As shown, the main valve reversing spool assembly 203 mainly comprises: a shaft 2031, a lock nut 2032, a lock washer 2033, a copper washer 2034, an end face sealing ring 2035, a positioning spool 2036, and a spool sealing gasket 2037. The lock washer 2033, the copper washer 2034, the end face sealing ring 2035, and the positioning spool 2036 are all sleeved on the shaft 2061; the two end face sealing rings 2035 are respectively arranged at the left and right ends of the positioning spool 2036 and are locked by the lock nut 2062; the lock washer 2033 and the copper washer 2034 are arranged between the lock nut 2062 and the end face sealing ring 2035; the spool sealing gasket 2037 is of a special shape and is bonded in the annular groove of the end face sealing ring 2035 through a vulcanization process. Further, the lock washer 2033, the copper washer 2034, the end face sealing ring 2035, the positioning spool 2036, and the shaft 2031 are in clearance fit. The slight gap between the end face sealing ring 2035 and the positioning spool 2036 can cause leakage of the working medium, and a sealing structure is designed between the end face sealing ring 2035 and the positioning spool 2036, which is of a rectangular plus circular arc structure and is made of hydrogenated nitrile rubber. The shaft 2031 is designed in a hollow form to ensure that the spring cavity of the left main valve return spring is in communication with the left cavity of the reversing piston and is ultimately in communication with the atmosphere.

[0031] In the present embodiment, as Figure 6As shown, the pilot valve 1 mainly comprises: a pilot valve body 101, a manual switch 102, an O-shaped sealing ring 103, an electromagnetic coil 104, a static valve core assembly 105, a lock nut 106, a dynamic valve core assembly 107, a pilot valve return spring 108, and an air inlet valve nozzle 109. Among them, the electromagnetic coil 104 is located at the upper part of the pilot valve body 101, and the top end is provided with an opening; the static valve core assembly 105 is screwed into the pilot valve body 101 through the lower end, and cooperates with the pilot valve body 101 to form a pilot valve cavity; the O-shaped sealing ring 103 is installed in the annular groove at the lower end of the static valve core assembly 105, and is in contact with the side wall of the inner hole of the pilot valve body 101 to realize sealing, preventing the pilot valve cavity from leaking gas; the top end of the static valve core assembly 105 extends out of the opening at the top end of the electromagnetic coil 104; the part of the static valve core assembly 105 extending out of the electromagnetic coil 104 is a threaded structure, used to connect the lock nut 106, and the electromagnetic coil 104 is pressed tightly with the pilot valve body 101 by tightening the lock nut 106; the bottom end of the static valve core assembly 105 is provided with a cylindrical through hole with a lower end opening, and the dynamic valve core assembly 107 is installed in the cylindrical through hole; the lower end of the dynamic valve core assembly 107 is a conical structure, and the pilot valve return spring 108 is a conical spring; one end of the pilot valve return spring 108 is sleeved on the conical structure at the lower end of the dynamic valve core assembly 107, and is limited by the conical structure at the lower end of the dynamic valve core assembly 107, so that the pilot valve return spring 108 will not fall off during the movement of the dynamic valve core assembly 107; the other end of the pilot valve return spring 108 is in contact with the static valve core assembly 105, and the pilot valve return spring 108 is pre-tightened and compressed by the static valve core assembly 105; the pilot valve return spring 108 applies a spring force to the dynamic valve core assembly 107, so that the bottom end of the dynamic valve core assembly 107 is in contact with the air inlet valve nozzle 109, and abuts against the control gas inlet A1011 arranged at the bottom of the pilot valve body 101; a cylindrical step hole is arranged in the central inner cavity of the pilot valve body 101, used to install the air inlet valve nozzle 109, and the air inlet valve nozzle 109 is in interference fit with the pilot valve body 101, and the fitting surface is coated with sealing glue to prevent gas leakage; the manual switch 102 is installed in the pilot valve body 101 through the cylindrical hole on the right side of the pilot valve body 101, and is clamped by the lower end ring of the static valve core assembly 105 to prevent it from falling out.

[0032] In this embodiment, as shown in Figure 8 The main valve seat 201 is provided with a connection port I2011, a connection port M2012, a discharge port N2013, a connection port O2014, a connection port P2015, and a connection port Q2016. As shown in Figure 5 The main valve body 202 is provided with a connection port G2021, a connection port H2022, a connection port J2023, a connection port K2024, and a connection port L2025. As shown in Figure 4As shown, the valve cover 205 is provided with a connection port II 2051, a connection port E 2052 and a connection port F 2053. The bottom of the pilot valve body 101 is provided with a control gas inlet A1011 and a control gas outlet B1012; the top end of the static valve core assembly 105 is provided with a discharge port C1051 which is in communication with the outside. Among them, one end of the stainless steel pipe 3 is connected with the connection port I 2011 through a straight-through sleeve, and the other end is connected with the connection port II 2051 through a straight-through sleeve, so as to introduce the gas in the gas inlet 4 into the inner cavity 2054 of the valve cover; the control gas inlet A1011 and the control gas outlet B1012 are both in communication with the pilot valve cavity; the upper side of the connection port E 2052 is in communication with the control gas inlet A1011, and the lower side is in communication with the inner cavity 2054 of the valve cover; the upper side of the connection port F 2053 is in communication with the control gas outlet B1012, and the lower side is in communication with the connection port G 2021; so that the control gas enters the piston cavity on the right side of the reversing piston 204, achieving the purpose of reversing; the connection port H 2022 is in communication with the connection port M 2012, and the discharge port N 2013 is in communication, finally realizing communication with the outside atmosphere; the connection port J 2023 is in communication with the connection port O 2014 and the gas inlet 4; the connection port K 2024 is in communication with the connection port P 2015 and the gas outlet 6; the connection port L 2025 is in communication with the connection port Q 2016 and the exhaust port 5.

[0033] In this embodiment, as shown in Figure 7 The moving valve core assembly 107 mainly includes: a moving valve core 1071, a buffer spring 1072, an exhaust port sealing gasket 1073 and an air inlet sealing gasket 1074. Among them, the upper end of the moving valve core 1071 is provided with a special-shaped cavity, the side surface is provided with a through hole 10712, and the lower end is provided with a dovetail groove; the air inlet sealing gasket 1074 is pasted in the dovetail groove of the moving valve core 1071 through vulcanization process; the buffer spring 1072 is located in the cavity inside the moving valve core 1071 and is placed below the exhaust port sealing gasket 1073; the exhaust port sealing gasket 1073 is pressed into the special-shaped cavity inside the moving valve core 1071, one end compresses the buffer spring 1072, and the other end tightly abuts the upper end boss to prevent the exhaust port sealing gasket 1073 from falling off.

[0034] Further, the dynamic valve core 1071 has a plurality of flow guide grooves 10711 on the cylindrical surface thereof, which are used to communicate the control gas outlet B1012 and the discharge port C1051. The inlet seal pad 1074 is used to contact the edge of the inlet valve nozzle 109 to form a seal when the large flow pilot electromagnetic valve is in the "off state. The exhaust port seal pad 1073 is used to contact the edge of the static valve core assembly 105 to form a seal when the large flow pilot electromagnetic valve is in the "on" state. The buffer spring 1072 is used to compress and displace when the external force on the exhaust port seal pad 1073 is greater than the set sealing spring force, thereby achieving buffering and preventing the stress on the exhaust port seal pad 1073 from being too large, thereby avoiding damage to the exhaust port seal pad 1073. The exhaust port seal pad 1073 and the buffer spring 1072 are pressed into one body through the upper port of the dynamic valve core 1071, effectively preventing the exhaust port seal pad 1073 from falling out during movement. The inlet seal pad 1074 is formed by vulcanization and hot pressing process, thereby ensuring that it will not fall off during the axial movement of the dynamic valve core 1071 and having stable sealing performance.

[0035] In the present embodiment, when the electromagnetic coil 104 fails or is not powered: if the electromagnetic valve needs to be opened, the manual switch 102 is manually rotated clockwise by 180° to open the electromagnetic valve, so that the control gas inlet A1011 and the control gas outlet B1012 are communicated; if the electromagnetic valve needs to be closed, the manual switch 102 is manually rotated counterclockwise by 180° to close the electromagnetic valve, so that the control gas inlet A1011 is cut off and the control gas outlet B1012 and the discharge port C1051 are communicated.

[0036] In the present embodiment, the working process of the large flow pilot electromagnetic valve is as follows:

[0037] Unpowered state:

[0038] When the large flow pilot electromagnetic valve is not powered, the pilot valve reset spring on the pilot valve dynamic valve core provides a sealing force, so that the inlet seal pad contacts the inlet valve nozzle to achieve sealing, and the control gas inlet A at the bottom of the pilot valve body is sealed. The dynamic valve core has flow guide grooves on the cylindrical surface thereof, so that the control gas outlet B and the discharge port C are communicated with the atmosphere. The cavity on the right side of the main valve reversing piston is communicated with the atmosphere through the control gas outlet B and the discharge port C. The main valve reset spring provides a sealing force, so that the seal pad of the main valve reversing valve core contacts the edge on the left side of the main valve body to achieve sealing. At this time, the inlet of the main valve is cut off, and the outlet and the discharge port are communicated.

[0039] Power-on opening process:

[0040] When the large flow pilot electromagnetic valve is powered on, the dynamic valve core assembly of the pilot valve is opened under the action of electromagnetic force, the exhaust port sealing pad contacts the blade of the static valve core assembly to realize sealing, the discharge port C is sealed, and the control gas inlet A and the control gas outlet B are communicated. At this time, the control gas reaches the control gas outlet B through the control gas inlet A, thereby entering the right cavity of the main valve reversing piston, and when the pressure reaches the set pressure, the reversing piston overcomes the spring force of the main valve return spring, pushes the main valve reversing valve core to move left, and finally makes the main valve reversing valve core sealing pad contact the right blade of the main valve body to realize sealing. At this time, the gas inlet and the gas outlet are communicated, and the discharge port is closed.

[0041] Power-off closing process:

[0042] When the large flow pilot electromagnetic valve is powered off, the pilot valve return spring pushes the dynamic valve core assembly of the pilot valve to close, so that the inlet sealing pad contacts the inlet valve nozzle to realize sealing, the control gas inlet A is sealed, and the control gas outlet B and the discharge port C are communicated. The compressed air in the right cavity of the main valve reversing piston is communicated with the atmosphere through the control gas outlet B and the discharge port C, and is discharged. When the pressure in the right cavity of the main valve reversing piston is lower than the set pressure, the main valve return spring pushes the main valve reversing valve core assembly to move right, and finally makes the main valve reversing valve core sealing pad contact the left blade of the main valve body to realize sealing, at this time the inlet is closed, and the outlet and the discharge port are communicated.

[0043] It should be noted that the above is only one embodiment of the technical scheme of the present application, and in this embodiment, the main valve structure is a two-position three-way valve. In actual application, the number and position of the inlet and outlet of the main valve can be changed according to the same principle.

[0044] Although the present application has been disclosed as above with reference to the preferred embodiments, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical scheme of the present application by using the disclosed methods and technical contents without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not depart from the technical scheme of the present application, belongs to the protection scope of the technical scheme of the present application.

[0045] The contents not described in detail in the specification of the present application belong to the known technology of the person skilled in the art.

Claims

1. A high-flow-rate pilot-operated solenoid valve, characterized in that, include: Pilot valve (1), main valve (2) and stainless steel pipe (3); wherein, the main valve (2) is provided with an air inlet (4), a vent (5) and an air outlet (6); the solenoid valve controls the gas and the main valve supplies the same gas, and the gas in the air inlet (4) is introduced into the pilot valve (1) through the stainless steel pipe (3); The main valve (2) includes: a main valve seat (201), a main valve body (202), a main valve reversing valve core assembly (203), a reversing piston (204), a valve cover (205), and a main valve return spring (206); wherein, the main valve reversing valve core assembly (203) is installed in the inner cavity of the main valve body (202); the main valve return spring (206) and the reversing piston (204) are disposed in the inner cavity of the main valve body (202) and are located at the left and right ends of the main valve reversing valve core assembly (203), respectively; The pilot valve (1) includes: a pilot valve body (101), an electromagnetic coil (104), a stationary valve core assembly (105), a moving valve core assembly (107), and a pilot valve return spring (108); wherein, the electromagnetic coil (104) is located on the upper part of the pilot valve body (101) and has an opening at the top; the stationary valve core assembly (105) is screwed into the pilot valve body (101) through a thread at the lower end and together with the pilot valve body (101) forms the pilot valve cavity; the stationary valve core assembly (105) has a cylindrical through hole with an opening at the lower end at the bottom end, and the moving valve core assembly (107) is installed in the cylindrical through hole; the pilot valve return spring (108) applies spring force to the moving valve core assembly (107) so that the bottom end of the moving valve core assembly (107) contacts the inlet valve nozzle (109) and abuts against the control gas inlet A (1011) provided at the bottom of the pilot valve body (101); The main valve seat (201) is provided with connection port I (2011), connection port M (2012), discharge port N (2013), connection port O (2014), connection port P (2015) and connection port Q (2016); the main valve body (202) is provided with connection port G (2021), connection port H (2022), connection port J (2023), connection port K (2024) and connection port L (2025); the valve cover (205) is provided with connection port II. (2051), connection port E (2052) and connection port F (2053); the bottom of the pilot valve body (101) is provided with a control gas inlet A (1011) and a control gas outlet B (1012); the top center of the static valve core assembly (105) is provided with a discharge port C (1051) communicating with the outside; wherein, one end of the stainless steel pipe (3) is connected to connection port I (2011) through a straight-through sleeve, and the other end is connected to connection port II (2051) through a straight-through sleeve, so as to allow the inlet to pass through the connection port. Gas is introduced into the valve cover cavity (2054) through the gas inlet (4); both the control gas inlet A (1011) and the control gas outlet B (1012) are connected to the pilot valve cavity; the upper side of the connection port E (2052) is connected to the control gas inlet A (1011), and the lower side is connected to the valve cover cavity (2054); the upper side of the connection port F (2053) is connected to the control gas outlet B (1012), and the lower side is connected to the connection port G (2021); thus, the control gas enters the valve cover cavity (2054). To the piston chamber on the right side of piston (204), the purpose of reversing is achieved; connection port H (2022) is connected to connection port M (2012) and discharge port N (2013), and finally realizes communication with the outside atmosphere; connection port J (2023) is connected to connection port O (2014) and air inlet (4); connection port K (2024) is connected to connection port P (2015) and air outlet (6); connection port L (2025) is connected to connection port Q (2016) and vent (5).

2. The high-flow-rate pilot-operated solenoid valve according to claim 1, characterized in that, The main valve (2) also includes: an end cap (207) and an annular seal (209); wherein, the main valve body (202) is mounted on the main valve seat (201) and encapsulated by the valve cover (205) and the end cap (207); the main valve reversing valve core assembly (203) is mounted in the inner cavity of the main valve body (202) by the annular seal (209); the pilot valve (1) is connected to the valve cover (205) by screws.

3. The high-flow-rate pilot-operated solenoid valve according to claim 2, characterized in that, The main valve reversing valve core assembly (203) includes: a shaft (2031), a locking nut (2032), an anti-loosening gasket (2033), a copper gasket (2034), an end face sealing ring (2035), a positioning valve core (2036), and a valve core sealing gasket (2037); wherein, the anti-loosening gasket (2033), the copper gasket (2034), the end face sealing ring (2035), and the positioning valve core (2036) are all fitted onto the shaft (2031). 61) On the top; two end face sealing rings (2035) are respectively set at the left and right ends of the positioning valve core (2036) and locked by the locking nut (2062); the anti-loosening gasket (2033) and the copper gasket (2034) are set between the locking nut (2062) and the end face sealing ring (2035); the valve core sealing gasket (2037) is of irregular shape and is bonded to the annular groove of the end face sealing ring (2035) by vulcanization process.

4. The high-flow-rate pilot-operated solenoid valve according to claim 2, characterized in that, The pilot valve (1) also includes: a manual switch (102), an O-ring seal (103), a lock nut (106), and an inlet valve nozzle (109); wherein, the O-ring seal (103) is installed in the annular groove at the lower end of the threaded end of the stationary valve core assembly (105) and contacts the inner wall of the pilot valve body (101) to achieve a seal, preventing gas leakage from the pilot valve cavity; the top end of the stationary valve core assembly (105) extends from the opening at the top end of the solenoid coil (104) to the outside of the solenoid coil (104); the part of the stationary valve core assembly (105) extending outside the solenoid coil (104) is a threaded structure, used to connect the lock nut (106), and by tightening the lock nut... The mother (106) presses the electromagnetic coil (104) against the pilot valve body (101); the lower end of the moving valve core assembly (107) has a conical structure, and the pilot valve return spring (108) is a conical spring; one end of the pilot valve return spring (108) is fitted onto the conical structure at the lower end of the moving valve core assembly (107), and is limited by the conical structure at the lower end of the moving valve core assembly (107); the other end of the pilot valve return spring (108) contacts the stationary valve core assembly (105), and the stationary valve core assembly (105) pre-tightens and compresses the pilot valve return spring (108); a cylindrical stepped hole is provided in the center of the inner cavity of the pilot valve body (101) for installing the air inlet valve nozzle (109). The inlet valve nozzle (109) is press-fitted with the pilot valve body (101), and the mating surfaces are coated with sealant to prevent gas leakage; the manual switch (102) is inserted into the pilot valve body (101) through the cylindrical hole on the right side of the pilot valve body (101), and the manual switch (102) is locked by the lower ring of the static valve core assembly (105) to prevent it from coming out.

5. The high-flow-rate pilot-operated solenoid valve according to claim 4, characterized in that, The moving valve core assembly (107) includes: a moving valve core (1071), a buffer spring (1072), an exhaust port sealing gasket (1073), and an intake port sealing gasket (1074); wherein, the moving valve core (1071) has a shaped cavity at the upper end, a through hole (10712) on the side, and a dovetail groove at the lower end; the intake port sealing gasket (1074) is bonded to the dovetail groove of the moving valve core (1071) by a vulcanization process; the buffer spring (1072) is located in the cavity inside the moving valve core (1071) and is placed below the exhaust port sealing gasket (1073); the exhaust port sealing gasket (1073) is press-fitted into the shaped cavity inside the moving valve core (1071), with one end compressing the buffer spring (1072) and the other end tightly attached to the upper boss to prevent the exhaust port sealing gasket (1073) from slipping off.

6. The high-flow-rate pilot-operated solenoid valve according to claim 5, characterized in that, The inlet sealing gasket (1074) is used to contact the cutting edge of the inlet valve nozzle (109) to form a seal when the high-flow pilot-operated solenoid valve is in the "closed" state; the exhaust sealing gasket (1073) is used to contact the cutting edge of the stationary valve core assembly (105) to form a seal when the high-flow pilot-operated solenoid valve is in the "open" state.

7. The high-flow-rate pilot-operated solenoid valve according to claim 5, characterized in that, The buffer spring (1072) is used to compress and generate displacement when the external force on the exhaust port sealing gasket (1073) is greater than the set sealing spring force, thereby achieving buffering and preventing excessive stress on the exhaust port sealing gasket (1073) and thus avoiding damage to the exhaust port sealing gasket (1073).

8. The high-flow-rate pilot-operated solenoid valve according to claim 5, characterized in that, The moving valve core (1071) has several guide grooves (10711) on its cylindrical surface, which are used to connect the control gas outlet B (1012) and the discharge port C (1051).

9. The high-flow-rate pilot-operated solenoid valve according to claim 4, characterized in that, When the electromagnetic coil (104) is faulty or there is no power supply: If it is necessary to open the electromagnetic valve, the manual switch (102) can be turned 180° clockwise by manual operation to open the electromagnetic valve and connect the control gas inlet A (1011) and the control gas outlet B (1012); If it is necessary to close the electromagnetic valve, the manual switch (102) can be turned 180° counterclockwise by manual operation to close the electromagnetic valve, cut off the control gas inlet A (1011), and connect the control gas outlet B (1012) and the discharge port C (1051).

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