Self-locking pressure reducing valve

Abstract

The application belongs to the technical field of pressure reducing valves, and particularly relates to a self-locking pressure reducing valve, which comprises an inlet joint, a self-locking unit, a sealing head and a pressure reducing unit. The self-locking unit comprises a self-locking shell, a coil assembly, a soft magnetic ring, a soft magnetic rod, a planar valve core base and a planar valve core. The sealing head is fixedly connected to one end of the self-locking shell away from the inlet joint. The pressure reducing unit comprises a pressure reducing shell and a pressure reducing structure arranged in the pressure reducing shell. The pressure reducing shell is fixedly connected to the sealing head, and an air outlet is arranged on the pressure reducing shell and connected to a pressure reducing air passage formed by the pressure reducing structure. The coil assembly is used to drive the planar valve core to produce displacement, open or close the valve, and lock the magnetic ring to keep the valve in the open or closed state. The diaphragm is used to sense pressure changes and drive the conical valve core to stabilize the outlet pressure of the valve, so that the high-pressure gas at the inlet can be reduced to a required outlet pressure. The outlet pressure can be kept unchanged when the inlet pressure and flow change.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pressure reducing valves, and particularly relates to a self-locking pressure reducing valve. BACKGROUND

[0002] Pressure control is an important link in a satellite propulsion system, for example, high-pressure xenon gas is output as low-pressure xenon gas to output a small flow of xenon gas to a thruster in an electric propulsion system, and high-pressure helium gas is output as low-pressure constant pressure to a tank to increase pressure in a bipropellant propulsion system. The pressure reducing valve is used in these working conditions, and has high requirements, for example, the pressure reducing valve has small volume, light mass, high output pressure precision, long service life, and a self-locking function, so as to improve the control precision and reliability of the propulsion system. However, due to material and structure reasons, a traditional regulating valve cannot meet the above use requirements. SUMMARY

[0003] In order to solve the above technical problems, the application provides a self-locking pressure reducing valve, which utilizes a coil assembly to drive a planar valve core to generate displacement, so that the valve is in an open or closed state, and utilizes a diaphragm to sense pressure changes and drive a conical valve core to stabilize the outlet pressure of the valve, so as to meet the requirement of reducing the inlet high-pressure gas to a required outlet pressure, and keep the outlet pressure unchanged when the inlet pressure and flow change.

[0004] The application is implemented in the following manner, a self-locking pressure reducing valve is provided, which comprises an inlet joint, a self-locking unit, a sealing head and a pressure reducing unit, the inlet joint is provided with an air inlet, the self-locking unit comprises a self-locking shell, a coil assembly, a soft magnetic ring, a soft magnetic rod, a planar valve core base and a planar valve core arranged in the self-locking shell, the coil assembly is arranged between the self-locking shell and the soft magnetic ring, the soft magnetic ring is connected with the inlet joint after extending out of the self-locking shell, the soft magnetic rod is arranged in a through cavity in the soft magnetic ring, and the soft magnetic rod has a certain movement stroke along the inner wall of the soft magnetic ring, the coil assembly controls the movement of the soft magnetic rod, the planar valve core base is fixedly arranged in the through cavity in the soft magnetic rod, a through air passage is arranged in the planar valve core base, and the planar valve core base is connected with the planar valve core at an end away from the inlet joint.

[0005] The sealing head is fixedly connected at an end of the self-locking shell away from the inlet joint, a through air passage is arranged in the middle of the sealing head, and the movement distance of the soft magnetic rod with the planar valve core enables the planar valve core to be sealed and pressed against the air passage inlet of the sealing head or a certain distance away from the air passage inlet.

[0006] The pressure reducing unit comprises a pressure reducing shell and a pressure reducing structure arranged in the pressure reducing shell, the pressure reducing shell is fixedly connected with the sealing head, an air outlet is arranged on the pressure reducing shell, and the air outlet is connected with a pressure reducing air passage formed by the pressure reducing structure.

[0007] Preferably, the pressure reducing structure comprises a conical valve core, a secondary spring, a valve seat assembly, a diaphragm and a diaphragm displacement control assembly, one end of the secondary spring is connected to the inner wall of the pressure reducing shell near the air passage of the sealing head, the other end is connected to the conical valve core, the valve seat assembly is fixed to the inner wall of the pressure reducing shell, the secondary spring controls the conical outer wall of the conical valve core to press on the valve seat assembly, the valve seat assembly is provided with a through air passage in the middle, the valve core rod of the conical valve core away from the secondary spring is movably arranged through the valve seat assembly and contacts the diaphragm, the edge of the diaphragm is fixedly connected to the inner wall of the pressure reducing shell, the diaphragm displacement control assembly is connected to the inside of the pressure reducing shell and contacts the other side of the diaphragm, controls the diaphragm to generate displacement, and the air outlet is arranged on the pressure reducing shell between the valve seat assembly and the diaphragm.

[0008] Further preferably, the valve seat assembly comprises a sealing cone and a conical valve core seat, the sealing cone is arranged in the conical valve core seat, a through hole matched with the conical outer wall of the conical valve core is arranged in the middle of the side of the sealing cone close to the conical valve core, a variable-diameter through hole is arranged in the middle of the conical valve core seat, the variable-diameter through hole has a large hole diameter on the side close to the sealing cone, and the inner wall on the side away from the sealing cone is in contact with the outer wall of the valve core rod of the conical valve core, and a plurality of air passages are arranged between the large-diameter section of the variable-diameter through hole and the outer wall of the conical valve core seat close to the diaphragm.

[0009] Further preferably, the diaphragm displacement control assembly comprises a pressing disc, a supporting disc, a main spring, a main spring seat and a main spring sleeve, the pressing disc is fixedly pressed against the inner wall of the pressure reducing shell, the edge of the diaphragm is clamped between the pressing disc and the inner wall of the pressure reducing shell, the main spring sleeve is connected to the inner wall of the pressure reducing shell, the main spring sleeve is sleeved on the side of the main spring seat close to the diaphragm, one end of the main spring is connected to the main spring seat, and the other end is connected to the recessed part in the middle of the side of the supporting disc, the protruding part in the middle of the other side of the supporting disc passes through the hole in the middle of the pressing disc and contacts the diaphragm, and the other end of the main spring seat is connected to the main spring sleeve.

[0010] Further preferably, the diaphragm displacement control assembly further comprises a locking nut, the locking nut is threadedly connected to the outer wall of the main spring seat and is in contact with the main spring sleeve.

[0011] Further preferably, the coil assembly comprises a closing coil, an opening coil and a locking magnetic ring, the closing coil is sleeved on the side of the soft magnetic ring close to the planar valve core, the opening coil is sleeved on the side of the soft magnetic ring close to the inlet connector, and the locking magnetic ring is sleeved on the soft magnetic ring between the closing coil and the opening coil, and the closing coil and the opening coil are connected to an external power source through the closing coil lead and the opening coil lead respectively.

[0012] Further preferably, a soft magnetic seat is fixedly arranged on the inner wall of the soft magnetic ring on the side close to the planar valve core, and the soft magnetic rod moves in position through the limiting of the soft magnetic seat.

[0013] Further preferably, the air passage inside the planar valve core base is T-shaped, and a gap is provided between the planar valve core base and the soft magnetic base and in communication with the T-shaped air passage of the planar valve core base, and the planar valve core is partially embedded in the planar valve core base.

[0014] Further preferably, a filter screen is provided at one end of the soft magnetic ring close to the inlet joint.

[0015] Compared with the prior art, the self-locking pressure reducing valve provided by the application has the following advantages:

[0016] 1. A certain voltage is applied to the open coil or the close coil to cause displacement of the planar valve core, so as to achieve the effect of opening or closing the valve, the locking magnetic ring keeps the valve in the open or closed state, the diaphragm senses the change of the outlet pressure and drives the conical valve core to stabilize the outlet pressure, the high-pressure gas at the inlet is reduced to a required outlet pressure, and the outlet pressure remains unchanged when the inlet pressure and flow change.

[0017] 2. The valve opening degree depends on the stiffness values of the main spring and the auxiliary spring, and under the condition of certain structure and form, the valve can be adjusted in pressure and flow by adjusting the compression amount of the main spring.

[0018] 3. The valve has a self-locking function, and the outlet pressure of the valve has no risk of climbing, and the reliability is high.

[0019] 4. The main spring is used to drive the diaphragm to displace and adjust the outlet pressure of the valve, and the auxiliary spring is used to press the conical valve core to adjust the opening degree between the conical valve core and the sealing cone, and the structure has good motion rigidity and dynamic stability, so that the valve has the advantages of fast response, high reliability and long service life.

[0020] 5. The valve structure is integrated, light in weight and small in size. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 The self-locking pressure reducing valve provided by the application is shown in the appearance view;

[0022] Figure 2 The self-locking pressure reducing valve provided by the application is shown in the cross-sectional view in the closed state;

[0023] Figure 3 The self-locking pressure reducing valve provided by the application is shown in the cross-sectional view in the open state;

[0024] In the figure: 1-main spring seat, 2-locking nut, 3-main spring rotating sleeve, 4-main spring, 5-pressure reducing shell, 6-pressing disc, 7-supporting disc, 8-conical valve core valve seat, 9-diaphragm, 10-conical valve core, 11-secondary spring, 12-sealing cone, 13-sealing head, 14-flat valve core, 15-soft magnetic seat, 16-flat valve core base, 17-closing coil wire, 18-closing coil, 19-locking magnetic ring, 20-soft magnetic rod, 21-opening coil wire, 22-opening coil, 23-filter screen, 24-soft magnetic ring, 25-self-locking shell, 26-inlet connector. DETAILED DESCRIPTION

[0025] The application will be described in detail below with specific embodiments. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that for those skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made. These all belong to the protection scope of the application.

[0026] Reference Figure 1 , Figure 2 and Figure 3 , the application provides a self-locking pressure reducing valve, which comprises an inlet connector 26, a self-locking unit, a sealing head 13 and a pressure reducing unit, the inlet connector 26 is provided with an air inlet, the self-locking unit comprises a self-locking shell 25 and a coil assembly, a soft magnetic ring 24, a soft magnetic rod 20, a flat valve core base 16 and a flat valve core 14 arranged inside the self-locking shell 25, the coil assembly is arranged between the self-locking shell 25 and the soft magnetic ring 24, the soft magnetic ring 24 is connected with the inlet connector 26 after extending out of the self-locking shell 25, the soft magnetic rod 20 is arranged in a through cavity inside the soft magnetic ring 24, and the soft magnetic rod 20 has a certain moving stroke along the inner wall of the soft magnetic ring 24, the coil assembly controls the movement of the soft magnetic rod 20, the flat valve core base 16 is fixedly arranged in the through cavity inside the soft magnetic rod 20, the flat valve core base 16 is provided with a through air passage inside, and the flat valve core base 16 is connected with the flat valve core 14 at an end away from the inlet connector 26.

[0027] The sealing head 13 is fixedly connected at an end of the self-locking shell 25 away from the inlet connector 26, the sealing head 13 is provided with a through air passage in the middle, and the moving distance of the soft magnetic rod 20 with the flat valve core 14 makes the flat valve core 14 seal and press against the air passage inlet of the sealing head 13 or a certain distance away from the air passage inlet.

[0028] The pressure reducing unit comprises a pressure reducing shell 5 and a pressure reducing structure arranged inside the pressure reducing shell 5, the pressure reducing shell 5 is fixedly connected with the sealing head 13, and the pressure reducing shell 5 is provided with an air outlet, the air outlet is connected with a pressure reducing air passage formed by the pressure reducing structure.

[0029] When the pressure reducing valve needs to be closed, the soft magnetic ring 24 is controlled by the coil assembly to move towards the sealing head 13, thereby driving the soft magnetic rod 20, the flat valve core base 16, and the flat valve core 14 to move towards the sealing head 13, so that the flat valve core 14 is pressed against the air passage inlet of the sealing head 13. The coil assembly keeps the valve closed. In this case, even if high-pressure gas is input into the inlet joint 26, no gas will be discharged from the outlet, and the pressure reducing valve is in a closed state.

[0030] When the pressure reducing valve needs to be opened, the soft magnetic ring 24 is controlled by the coil assembly to move away from the sealing head 13, thereby driving the soft magnetic rod 20, the flat valve core base 16, and the flat valve core 14 to move away from the sealing head 13, so that the flat valve core 14 is away from the air passage inlet by a certain distance. The coil assembly keeps the valve open. In this case, when high-pressure gas is input into the inlet joint 26, the high-pressure gas passes through the air passages of the soft magnetic ring 24, the soft magnetic rod 20, and the flat valve core base 16, and then passes through the air passage of the sealing head 13, enters the pressure reducing structure of the pressure reducing shell 5, and then passes through the pressure reducing air passage formed by the pressure reducing structure, so that the pressure of the high-pressure gas is reduced to the target degree and is discharged from the outlet.

[0031] As a specific implementation of the pressure reducing structure, the pressure reducing structure includes a conical valve core 10, a secondary spring 11, a valve seat assembly, a diaphragm 9, and a diaphragm displacement control assembly. One end of the secondary spring 11 is connected to the inner wall of the pressure reducing shell 5 near the air passage of the sealing head 13, and the other end is connected to the conical valve core 10. The valve seat assembly is fixed to the inner wall of the pressure reducing shell 5. The secondary spring 11 controls the conical outer wall of the conical valve core 10 to press on the valve seat assembly. The valve seat assembly has a through air passage in the middle. The valve core rod away from the secondary spring 11 of the conical valve core 10 is movably connected to the diaphragm 9. The edge of the diaphragm 9 is fixedly connected to the inner wall of the pressure reducing shell 5. The diaphragm displacement control assembly is connected to the inside of the pressure reducing shell 5 and contacts the other side of the diaphragm 9. The diaphragm displacement control assembly controls the diaphragm 9 to displace. The outlet is arranged on the pressure reducing shell 5 between the valve seat assembly and the diaphragm 9.

[0032] When the pressure reducing valve is used, the diaphragm displacement control assembly is adjusted according to the use requirement of the pressure reducing valve under specific working conditions, so that the diaphragm 9 is displaced by the diaphragm displacement control assembly, the conical valve core 10 is pushed, and the conical outer wall of the conical valve core 10 has a gap with the valve seat assembly for gas to pass through. After adjustment, when the pressure reducing valve is in an open state, high-pressure gas enters the pressure reducing shell 5 from the gas channel of the sealing head 13, passes through the cavity between the conical valve core 10 and the pressure reducing shell 5, enters the gas channel of the valve seat assembly from the gap between the conical outer wall of the conical valve core 10 and the valve seat assembly, and then flows into the cavity between the valve seat assembly and the diaphragm 9, and finally is discharged from the gas outlet at a predetermined pressure. In this process, the diaphragm 9 senses the pressure change and drives the conical valve core 10 to stabilize the valve outlet pressure, so as to meet the requirement of reducing the inlet high-pressure gas to a certain required outlet pressure, and keep the outlet pressure unchanged when the inlet pressure and flow change.

[0033] As a specific implementation of the valve seat assembly, the valve seat assembly comprises a sealing cone 12 and a conical valve core valve seat 8, the sealing cone 12 is arranged in the conical valve core valve seat 8, the sealing cone 12 is provided with a through hole matched with the conical outer wall of the conical valve core 10 at the middle part of the side close to the conical valve core 10, a variable-diameter through hole is arranged in the middle part of the conical valve core valve seat 8, the variable-diameter through hole has a large hole diameter at the side close to the sealing cone 12, and the inner wall of the side away from the sealing cone 12 is attached to the outer wall of the valve core rod of the conical valve core 10, and a plurality of gas channels are arranged between the large-diameter section of the variable-diameter through hole and the outer wall of the conical valve core valve seat 8 close to the diaphragm 9.

[0034] The gap between the conical valve core 10 and the sealing cone 12, the large-diameter section of the variable-diameter through hole, and the plurality of gas channels between the large-diameter section of the variable-diameter through hole and the outer wall of the conical valve core valve seat 8 close to the diaphragm 9 together form the gas channel of the valve seat assembly.

[0035] As a specific implementation of the diaphragm displacement control assembly, the diaphragm displacement control assembly comprises a pressing disc 6, a supporting disc 7, a main spring 4, a main spring seat 1 and a main spring rotating sleeve 3, the pressing disc 6 is fixedly pressed against the inner wall of the pressure reducing shell 5, the edge of the diaphragm 9 is clamped between the pressing disc 6 and the inner wall of the pressure reducing shell 5, the main spring rotating sleeve 3 is connected with the inner wall of the pressure reducing shell 5, the main spring 4 is sleeved on the side of the main spring seat 1 close to the diaphragm 9, one end of the main spring 4 is connected to the main spring seat 1, and the other end is connected to the recessed part in the middle of one side of the supporting disc 7, the protruding part in the middle of the other side of the supporting disc 7 passes through the hole in the middle of the pressing disc 6 and contacts the diaphragm 9, and the outer wall of the other end of the main spring seat 1 is connected with the main spring rotating sleeve 3.

[0036] When the position of the diaphragm 9 needs to be adjusted, the main spring seat 1 is rotated to adjust the position of the main spring seat 1 in the main spring rotating sleeve 3, so as to adjust the compression degree of the main spring 4, thereby making the main spring 4 push the support disc 7 to displace, the support disc 7 pushes the diaphragm 9 to displace, and the diaphragm 9 pushes the conical valve core 10 to make a gap between the conical outer wall of the conical valve core 10 and the valve seat assembly, according to the size of the gap, the preset outlet pressure is adjusted.

[0037] In order to limit the position, as an improvement of the technical scheme, the diaphragm displacement control assembly further comprises a locking nut 2 which is threadedly connected to the outer wall of the main spring seat 1 and is in contact with the main spring rotating sleeve 3.

[0038] As a specific implementation manner of the coil assembly, the coil assembly comprises a closing coil 18, an opening coil 22 and a locking magnetic ring 19, the closing coil 18 is sleeved on the soft magnetic ring 24 near one side of the planar valve core 14, the opening coil 22 is sleeved on the soft magnetic ring 24 near one side of the inlet joint 26, and the locking magnetic ring 19 is sleeved on the soft magnetic ring 24 between the closing coil 18 and the opening coil 22. The closing coil 18 and the opening coil 22 are respectively connected to an external power source through a closing coil lead wire 17 and an opening coil lead wire 21.

[0039] When the planar valve core 14 is controlled to displace by the coil assembly, if the pressure reducing valve needs to be in a closed state, the closing coil 18 is powered by the external power source, the closing coil 18 forms an attractive force on the soft magnetic rod 20, the soft magnetic rod 20 drives the planar valve core base 16 and the planar valve core 14 to move towards the sealing head 13, the planar valve core 14 is sealed and pressed on the air passage of the sealing head 13, the locking magnetic ring 19 makes the valve remain in the closed state, and the closing of the pressure reducing valve is realized. When the pressure reducing valve needs to be in an open state, the opening coil 22 is powered by the external power source, the opening coil 22 forms an attractive force on the soft magnetic rod 20, the soft magnetic rod 20 drives the planar valve core base 16 and the planar valve core 14 to move away from the sealing head 13, the planar valve core 14 is away from the air passage of the sealing head 13, the pressure reducing valve is opened, and the locking magnetic ring 19 makes the valve remain in the open state.

[0040] In order to limit the position of the soft magnetic rod 20, as an improvement of the technical scheme, a soft magnetic seat 15 is fixedly arranged on the inner wall of the soft magnetic ring 24 near the planar valve core 14, and the soft magnetic rod 20 is limited in position by the soft magnetic seat 15.

[0041] As a preferred arrangement of the internal air passage of the planar valve core base 16 and a reasonable connection manner of the planar valve core 14 and the planar valve core base 16, the internal air passage of the planar valve core base 16 is T-shaped, a gap in communication with the T-shaped air passage of the planar valve core base 16 is arranged between the planar valve core base 16 and the soft magnetic seat 15, and the planar valve core 14 is partially embedded in the planar valve core base 16.

[0042] In order to filter the impurities in the high-pressure gas, as an improvement of the technical scheme, a filter screen 23 is arranged at one end of the soft magnetic ring 24 close to the inlet joint 26.

[0043] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and various modifications or changes can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application.

Claims

1. A self-locking pressure reducing valve characterized by comprising: The utility model provides an improved valve, including entrance joint (26), self locking unit, sealing head (13) and pressure reducing unit, entrance joint (26) is equipped with air inlet on, self locking unit includes self locking casing (25) and the coil assembly, soft magnetic ring (24), soft magnetic rod (20), plane valve core base (16) and plane valve core (14) that set up in self locking casing (25) inside, coil assembly sets up between self locking casing (25) and soft magnetic ring (24), soft magnetic ring (24) stretches out after self locking casing (25) and is connected with entrance joint (26), soft magnetic rod (20) sets up in the cavity that passes through inside soft magnetic ring (24), and soft magnetic rod (20) has certain moving stroke along the inner wall of soft magnetic ring (24), coil assembly controls the movement of soft magnetic rod (20), plane valve core base (16) is fixedly arranged in the cavity that passes through inside soft magnetic rod (20), plane valve core base (16) is equipped with the air passage that passes through inside, and plane valve core base (16) is connected plane valve core (14) with one end away from entrance joint (26); Sealing head (13) is fixedly connected in the end of self locking casing (25) away from entrance joint (26), and the air passage that passes through is equipped in the middle part of sealing head (13), and the distance that soft magnetic rod (20) moves with plane valve core (14) makes plane valve core (14) seal and press in the air passage entrance of sealing head (13) or away from the air passage entrance certain distance; Pressure reducing unit includes pressure reducing casing (5) and pressure reducing structure that sets up in pressure reducing casing (5) inside, and pressure reducing casing (5) is fixedly connected with sealing head (13), and is equipped with air outlet on pressure reducing casing (5), and the pressure reducing air passage that is connected with pressure reducing structure is formed to air outlet.

2. The self-relieving pressure relief valve according to claim 1, characterized in that The pressure reducing structure includes conical valve core (10), auxiliary spring (11), valve seat assembly, diaphragm (9) and diaphragm displacement control assembly, one end of auxiliary spring (11) is connected in the inner wall of pressure reducing casing (5) near the air passage of sealing head (13), the other end is connected with conical valve core (10), valve seat assembly is fixed in the inner wall of pressure reducing casing (5), auxiliary spring (11) controls the conical outer wall of conical valve core (10) and press on valve seat assembly, the air passage that passes through is equipped in the middle part of valve seat assembly, and the valve core rod of conical valve core (10) away from auxiliary spring (11) one end can pass through valve seat assembly and diaphragm (9) contact, the rim of diaphragm (9) is fixedly connected in the inner wall of pressure reducing casing (5), diaphragm displacement control assembly is connected in pressure reducing casing (5) inside and with diaphragm (9) other side contact, control diaphragm (9) generates displacement, and is equipped with air outlet on the pressure reducing casing (5) between valve seat assembly and diaphragm (9).

3. The self-relieving pressure relief valve according to claim 2, wherein The valve seat assembly comprises a sealing cone (12) and a conical valve core valve seat (8), the sealing cone (12) is arranged in the conical valve core valve seat (8), the sealing cone (12) is provided with a through hole matched with the conical outer wall of the conical valve core (10) near the middle of one side of the conical valve core (10), a variable diameter through hole is arranged in the middle of the conical valve core valve seat (8), the variable diameter through hole has a large hole diameter near one side of the sealing cone (12), and the inner wall of the side far from the sealing cone (12) is attached to the valve core rod outer wall of the conical valve core (10), a plurality of air passages are arranged between the large hole diameter section of the variable diameter through hole and the outer wall of the conical valve core valve seat (8) near the diaphragm (9).

4. The self-relieving pressure relief valve according to claim 2, wherein The diaphragm displacement control assembly comprises a pressing disc (6), a supporting disc (7), a main spring (4), a main spring seat (1) and a main spring rotating sleeve (3), the pressing disc (6) is fixedly pressed against the inner wall of the pressure reducing shell (5), the edge of the diaphragm (9) is clamped between the pressing disc (6) and the inner wall of the pressure reducing shell (5), the main spring rotating sleeve (3) is connected with the inner wall of the pressure reducing shell (5), the main spring (4) is sleeved on one side of the main spring seat (1) near the diaphragm (9), one end of the main spring (4) is connected to the main spring seat (1), and the other end is connected to the recessed part in the middle of one side of the supporting disc (7), the protruding part in the middle of the other side of the supporting disc (7) passes through the hole in the middle of the pressing disc (6) and is in contact with the diaphragm (9), and the outer wall of the other end of the main spring seat (1) is connected with the main spring rotating sleeve (3).

5. The self-relieving pressure relief valve according to claim 4, wherein The diaphragm displacement control assembly further comprises a locking nut (2), which is threadedly connected to the outer wall of the main spring seat (1) and in contact with the main spring rotating sleeve (3).

6. The self-relieving pressure relief valve of claim 1, wherein The coil assembly comprises a closing coil (18), an opening coil (22) and a locking magnetic ring (19), the closing coil (18) is sleeved on one side of the soft magnetic ring (24) near the flat valve core (14), the opening coil (22) is sleeved on one side of the soft magnetic ring (24) near the inlet joint (26), and the locking magnetic ring (19) is sleeved on the soft magnetic ring (24) between the closing coil (18) and the opening coil (22), and the closing coil (18) and the opening coil (22) are connected to an external power source through the closing coil lead wire (17) and the opening coil lead wire (21) respectively.

7. The self-relieving pressure relief valve of claim 1, wherein A soft magnetic seat (15) is fixedly arranged on the inner wall of the soft magnetic ring (24) near the flat valve core (14), and the soft magnetic rod (20) moves in position limited by the soft magnetic seat (15).

8. The self-relieving pressure relief valve according to claim 7, characterized in that The air passage in the flat valve core base (16) is T-shaped, a gap in communication with the T-shaped air passage of the flat valve core base (16) is arranged between the flat valve core base (16) and the soft magnetic seat (15), and the flat valve core (14) is partially embedded in the flat valve core base (16).

9. The self-relieving pressure relief valve of claim 1, wherein A filter screen (23) is arranged at one end of the inner cavity of the soft magnetic ring (24) near the inlet joint (26).

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