Electromagnetic unloading valve

Abstract

The utility model relates to an electromagnetic unloading valve which comprises a main valve body, the main valve body is provided with a pump connecting opening, a liquid outlet and an unloading liquid return opening, a first flow channel and a second flow channel are limited in the main valve body, the first flow channel is communicated with the pump connecting opening and the liquid outlet, and the second flow channel is communicated with the pump connecting opening and the unloading liquid return opening; the liquid outlet valve is provided with a liquid outlet valve sleeve, a liquid outlet valve core and a valve core spring I, the peripheral wall of the liquid outlet valve sleeve is also provided with a liquid outlet valve port communicated with the flow channel, and the liquid outlet valve core can open or close the liquid outlet valve port; the unloading valve is provided with an unloading valve sleeve, an unloading valve element and a first valve element spring, an unloading valve port communicated with the flow channel is further formed in the circumferential wall of the unloading valve sleeve, the unloading valve element can open or close the unloading valve port, an annular groove is further formed in the outer circumferential wall of a core head of the unloading valve element, and path conduction is achieved when the annular groove is opposite to the unloading valve port. Due to the existence of the annular groove, the flowable area of liquid bubbles during unloading is increased, so that the liquid bubbles are broken due to pressure rise in the unloading and flowing process.

Description

Technical Field

[0001] The utility model relates to an electromagnetic unloading valve which is used on an emulsion pump for mining. Background Art

[0002] The electromagnetic unloading valve is an automatic pressure regulating device for the pump station. It can quickly respond to changes in the demand for liquid in the fully mechanized mining face, so that the pump station can quickly realize the programmed switching between working load and no-load under continuous operation, achieving the purpose of energy saving and high efficiency of the liquid supply system. The study found that the valve sleeve and valve core of the electromagnetic unloading valve unloading port were severely damaged by cavitation. This damage not only caused the loss of integrity of the unloading valve structure, affected the continuity and stability of the liquid supply, caused abnormal pressure pulsation, pipeline vibration and noise, but also the detached material residues caused the valve core to be stuck and the filter element to be blocked. In severe cases, there is also the risk of blockage and explosion of the filter system. Utility Model Content

[0003] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides an electromagnetic unloading valve. Due to the presence of the annular groove, the flow area of ​​the liquid bubble is increased during unloading, causing it to burst due to the increase in pressure during the unloading flow process.

[0004] The technical solution of the utility model: an electromagnetic unloading valve, comprising:

[0005] A main valve body, to which a solenoid valve can be connected, the main valve body having a pump connection port, a liquid outlet, and an unloading liquid return port, a first flow channel and a second flow channel are defined in the main valve body, the first flow channel is connected to the pump connection port and the liquid outlet, and the second flow channel is connected to the pump connection port and the unloading liquid return port;

[0006] A liquid outlet valve, the liquid outlet valve is communicated with the first flow channel, the liquid outlet valve comprises a liquid outlet valve sleeve, a liquid outlet valve core and a valve core spring 1, the liquid outlet valve sleeve is arranged in the first flow channel, and the peripheral wall of the valve sleeve also comprises a liquid outlet valve port communicating with the flow channel, the liquid outlet valve core is movably arranged in the liquid outlet valve sleeve to open or close the liquid outlet valve port, thereby controlling the on-off of the liquid outlet port, and the valve core spring 1 can drive the liquid outlet valve core to close the liquid outlet valve port;

[0007] An unloading valve is connected to the second flow channel, and the unloading valve comprises an unloading valve sleeve, an unloading valve core and a valve core spring. The unloading valve sleeve is arranged in the second flow channel, and the valve sleeve peripheral wall also comprises an unloading valve port communicating with the flow channel. The unloading valve core is movably arranged in the unloading valve sleeve to open or close the unloading valve port, thereby controlling the on-off of the unloading return liquid port. An annular groove is also provided on the peripheral wall of the core head of the unloading valve core. When the annular groove is opposite to the unloading valve port, path conduction is achieved, and the valve core spring can drive the unloading valve core to close the unloading valve port.

[0008] By adopting the above technical solution, when the solenoid valve is powered off, it is in the unloading state, the unloading valve is opened, the pump port and the unloading return port are connected, and the emulsion in the main valve body flows to the unloading return port for unloading. Due to the presence of the annular groove, the flow area of ​​the liquid bubble is increased during unloading, causing it to burst due to the increase in pressure during the unloading flow process; at the same time, due to the presence of the annular groove, it is more adapted to the fluidity of the medium, and the vortex area formed is also far away from the valve core and valve sleeve surface. Therefore, the improved valve core structure has a certain effect on the formation area of ​​the cavitation phenomenon of the valve. Improve the undesirable phenomenon of cavitation damage and improve the reliability of the unloading valve core and valve sleeve.

[0009] Preferably, the main valve body has an inlet channel and an outlet channel which are connected along the front-to-back direction, the pump port is opened at the port of the inlet channel, and the outlet port is opened at the port of the outlet channel; the first channel is a longitudinal channel arranged along the up-down direction, the first channel passes through the outlet channel and is connected to the middle part of the inlet channel, and the outlet valve sleeve is longitudinally installed in the first channel; the second channel is a transverse channel arranged along the left-right direction and is connected to the middle part of the inlet channel, and the unloading valve sleeve is transversely installed in the second channel.

[0010] Preferably, the main valve body is provided with an installation port 1 at the outer end of each flow channel, the valve sleeve is inserted into the corresponding flow channel through the installation port 1, and is limited by the retaining ring and the valve seat, the valve seat is detachably installed outside the main valve body and forms abutment with the outer end face of the corresponding valve sleeve, the retaining ring is arranged in the flow channel and forms abutment with the inner end face of the corresponding valve sleeve, the valve core spring is also abutted between the valve seat and the corresponding valve core, and the retaining ring can also contact with the core head of the valve core to limit the movement of the valve core. Disassembly is convenient, first remove the valve seat from the main valve body, and then the valve core spring, valve core, and valve sleeve can be removed from the installation port 1 for replacement.

[0011] Preferably, the valve sleeve has a base and a valve mouth portion extending from the base, the valve mouth is arranged on the valve mouth portion, the outer diameter of the valve mouth portion is smaller than the base, so that there is a gap one between the valve mouth and the inner wall of the corresponding flow channel, a sealing ring one is used to form a seal between the base and the inner wall of the flow channel, and a sealing ring two is used to form a seal between the base and the valve seat.

[0012] Preferably, each valve sleeve has a plurality of valve ports formed on its circumference.

[0013] Preferably, the main valve body is also provided with a pressure compensation airway, the pressure compensation airway is connected with a pressure compensation valve, the pressure compensation valve has an intake valve sleeve, a valve ball and a valve ball spring, the intake valve sleeve has a conductive air inlet and an air outlet at both ends, the intake is connected with the external air, and the air outlet is connected with the internal pressure compensation airway, the valve ball is movably arranged in the intake valve sleeve to open or close the intake, thereby controlling the connection and disconnection of the intake and the pressure compensation airway path, and the valve ball spring can drive the valve ball to close the intake outward. When the internal pressure of the valve body changes suddenly during unloading, the pressure drops sharply and is lower than the standard atmospheric pressure of 101325Pa, which will generate noise and jitter. By designing a pressure compensation valve, the external air pressure can be added to the main valve body, thereby reducing the noise generated during unloading.

[0014] Preferably, the air inlet is also provided with a conical surface cooperating with the valve ball.

[0015] Preferably, the main valve body is provided with a second installation port at the outer end of the pressure compensation air passage, the air intake valve sleeve is inserted into the second installation port and pressed against the limit surface of the inner wall of the second installation port through the air nozzle, the air intake valve sleeve and the inner wall of the second installation port are sealed through the sealing ring 3, a stop is pressed between the limit surface and the air intake valve sleeve, and the valve ball spring is arranged between the stop and the valve ball. Disassembly is convenient, first remove the air nozzle from the main valve body, and then the valve ball spring, valve ball, and air intake valve sleeve can be removed from the second installation port for replacement.

[0016] Preferably, a notch is provided on the inner wall of the air outlet of the air inlet valve sleeve, and the outer edge of the abutment abuts against the notch via the limiting surface, and a gap exists between the outer edge of the abutment part and the inner wall of the air outlet.

[0017] Preferably, the air nozzle is also sealed by a valve cover, and the valve cover is detachable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is one of the structural diagrams of a specific embodiment of the utility model;

[0019] Figure 2 This is the second structural diagram of a specific embodiment of the utility model;

[0020] Figure 3 This is one of the internal structure diagrams of a specific embodiment of the utility model;

[0021] Figure 4 This is the second internal structure diagram of a specific embodiment of the utility model;

[0022] Figure 5 This is a diagram of the internal structure of a unloading valve according to a specific embodiment of the utility model;

[0023] Figure 6 This is a structural diagram of a liquid outlet valve sleeve of a specific embodiment of the utility model;

[0024] Figure 7 This is a structural diagram of a unloading valve core in a specific embodiment of the utility model;

[0025] Figure 8 This is a diagram of the internal structure of a pressure compensation valve according to a specific embodiment of the utility model;

[0026] Fig. 9 This is a diagram of the internal structure of the intake valve sleeve of a specific embodiment of the utility model;

[0027] Fig.10 This is a structural diagram of an intake valve sleeve of a specific embodiment of the utility model;

[0028] Fig.11 This is one of the internal structure diagrams of the main valve body of a specific embodiment of the utility model;

[0029] Fig.12 This is the second internal structure diagram of the main valve body of a specific embodiment of the utility model;

[0030] Fig.13 This is a connection diagram between the utility model product and the solenoid valve.

[0031] In the figure: main valve body 1, pump connection port 11, liquid outlet 12, unloading liquid return port 13, first flow channel A, second flow channel B, liquid inlet flow channel 14, liquid outlet flow channel 15, liquid outlet valve 2, liquid outlet valve sleeve 21, liquid outlet valve port 211, liquid outlet valve core 22, valve core spring 1 23, unloading valve 3, unloading valve sleeve 31, unloading valve port 311, unloading valve core 32, retaining ring 41, annular groove 321, valve core spring 2 33, installation port 1 6. valve seat 42, base a1, valve mouth a2, gap one C1, sealing ring one 51, sealing ring two 52, pressure compensation airway D, pressure compensation valve 6, intake valve sleeve 61, air inlet 611, air outlet 612, cone surface 6111, valve ball 62, valve ball spring 63, installation port two 17, air nozzle 64, limit surface 171, sealing ring three 53, platform 65, groove 6121, gap two C2, valve cover 66. DETAILED DESCRIPTION

[0032] The technical scheme in this embodiment will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1-13 As shown, an electromagnetic unloading valve of the utility model comprises:

[0034] The main valve body 1 can also be connected to a solenoid valve. The main valve body 1 has a pump port 11, a liquid outlet 12 and an unloading return liquid port 13. The main valve body 1 defines a first flow channel A and a second flow channel B. The first flow channel A is connected to the pump port 11 and the liquid outlet 12, and the second flow channel B is connected to the pump port 11 and the unloading return liquid port 13. The main valve body 1 has a liquid inlet flow channel 14 and a liquid outlet flow channel 15 arranged in the front-to-back direction. The pump port 11 is opened. The liquid outlet 12 is opened on the front port or the rear port of the liquid inlet channel 14, and is connected to the front port or the rear port of the liquid outlet channel 15; the first channel A is a longitudinal channel arranged in the up-down direction, and the first channel A passes through the liquid outlet channel 15, and the upper end is connected to the middle of the liquid inlet channel 14; the second channel B is a transverse channel arranged in the left-right direction, and the right end is connected to the middle of the liquid inlet channel 14, and of course, the left end of the second channel B can also be connected to the middle of the liquid inlet channel 14;

[0035] The liquid outlet valve 2 is connected with the first flow channel A. The liquid outlet valve 2 comprises a liquid outlet valve sleeve 21, a liquid outlet valve core 22 and a valve core spring 23. The liquid outlet valve sleeve 21 is longitudinally installed in the first flow channel A, and the valve sleeve peripheral wall also comprises a liquid outlet valve port 211 which is connected with the flow channel. The liquid outlet valve core 22 is movably arranged in the liquid outlet valve sleeve 21 to open or close the liquid outlet valve port 211, so as to control the on-off of the liquid outlet port 12. The valve core spring 23 can drive the liquid outlet valve core 22 to close the liquid outlet valve port 211 upward, and the liquid outlet valve core 22 to open the liquid outlet valve port 211 downward;

[0036] The unloading valve 3 is connected with the second flow channel B, and the unloading valve 3 comprises an unloading valve sleeve 31, an unloading valve core 32 and a valve core spring 2 33. The unloading valve sleeve 31 is transversely installed in the second flow channel B, and the valve sleeve peripheral wall also comprises an unloading valve port 311 which is connected with the flow channel. The unloading valve core 32 is movably arranged in the unloading valve sleeve 31 to open or close the unloading valve port 311, so as to control the on-off of the unloading liquid return port 13. The outer peripheral wall of the core head at the right end of the unloading valve core 32 also comprises an annular groove 321. When the annular groove 321 is opposite to the unloading valve port 311, the path conduction is realized. The valve core spring 2 33 can drive the unloading valve core 32 to close the unloading valve port 311 to the right, and the unloading valve core 32 to open the unloading valve port 311 to the left.

[0037] Specifically, the main valve body 1 is provided with an installation port 16 at the outer end of each of the above-mentioned flow channels, the valve sleeve is inserted into the corresponding flow channel through the installation port 16, and is limited by the retaining ring 41 and the valve seat 42. The valve seat 42 is detachably installed outside the main valve body 1 and forms an abutment with the outer end surface of the corresponding valve sleeve. The retaining ring 41 is integrally or separately arranged in the flow channel and forms an abutment with the inner end surface of the corresponding valve sleeve. The valve core spring is also abutted between the valve seat 42 and the corresponding valve core. The retaining ring 41 can also contact with the core head of the valve core to limit the movement of the valve core.

[0038] Specifically, the valve sleeve comprises a base a1 and a valve mouth portion a2 extending from the base a1, the valve mouth is arranged on the valve mouth portion a2, the outer diameter of the valve mouth portion a2 is smaller than the base a1, so that there is a gap C1 between the valve mouth and the inner wall of the corresponding flow channel, the base and the inner wall of the flow channel are sealed by a sealing ring 1 51, the base a1 is also sealed by a sealing ring 2 52 with the valve seat 42, the valve core and the inner wall of the valve sleeve are also sealed by the sealing ring, and the retaining ring 41 and the inner wall of the flow channel are also sealed by the sealing ring.

[0039] Specifically, each valve sleeve is provided with a plurality of valve ports in the circumferential direction, and each valve port is spaced apart.

[0040] The main valve body 1 also has a pressure compensation air channel D, and the pressure compensation air channel D is connected to a pressure compensation valve 6. The pressure compensation valve 6 has an intake valve sleeve 61, a valve ball 62 and a valve ball spring 63. The two ends of the intake valve sleeve 61 have a conductive air inlet 611 and an air outlet 612. The air inlet 611 is conductive to the external air, and the air outlet 612 is connected to the internal pressure compensation air channel D. The valve ball 62 is movably arranged in the intake valve sleeve 61 to open or close the air inlet 611, so as to control the connection and disconnection of the air inlet 611 and the pressure compensation air channel D. The valve ball spring 63 can drive the valve ball 62 to close the air inlet outward, and external air enters from the air inlet 611. The air pressure pushes the valve ball 62 inward and makes it away from the air inlet 611. The air inlet 611 is opened, and the valve ball spring 63 is squeezed at this time.

[0041] Specifically, the air inlet 611 is further provided with a conical surface 6111 that cooperates with the valve ball 62 .

[0042] Specifically, the main valve body 1 is provided with an installation port 17 at the outer end of the pressure compensation air channel D, the intake valve sleeve 61 is installed in the installation port 17 and pressed against the limit surface 171 of the inner wall of the installation port 17 through the air nozzle 64, and a seal is formed between the intake valve sleeve 61 and the inner wall of the installation port 17 through the sealing ring 53, a stopper 65 is pressed between the limit surface 171 and the intake valve sleeve 61, and a notch 6121 is provided on the inner wall of the air outlet 612 of the intake valve sleeve, the outer edge of the stopper 65 is pressed into the notch 6121 through the limit surface 171, and there is a gap C2 between the outer edge of part of the stopper 65 and the inner wall of the air outlet 612, and the valve ball spring 63 is arranged between the stopper 65 and the valve ball 62.

[0043] Specifically, the air nozzle 64 is also blocked by a valve cover 66, and the valve cover 66 is detachable.

[0044] Working principle:

[0045] The emulsion pump is connected to the pump port 11 of the main valve body 1, and the solenoid valve is also connected to the main valve body 1. The emulsion in the pump flows into the main valve body 1. When the emulsion is discharged, the outlet valve core 22 moves downward to open the outlet valve port 211, and the emulsion in the main valve body 1 is discharged from the outlet port 12;

[0046] After the pressure in the main valve body 1 continues to rise to a certain level, the solenoid valve is powered off, and the valve is switched to the unloading state. The unloading valve 3 opens, and the emulsion in the main valve body 1 flows out from the unloading liquid return port 13 to achieve unloading and pressure reduction. Due to the presence of the annular groove, the flowable area of ​​the liquid bubbles in the main valve body is increased, causing them to burst due to the increase in pressure during the unloading flow process; at the same time, due to the presence of the annular groove, it is more adapted to the fluidity of the medium, and the vortex area formed is also far away from the valve core and valve sleeve surface. Therefore, the improved valve core structure has a certain effect on the cavitation formation area of ​​the valve. Improve the undesirable phenomenon of cavitation damage and improve the reliability of the unloading valve core and valve sleeve.

[0047] When unloading, the internal pressure of the valve body changes suddenly. The pressure drops sharply and is lower than the standard atmospheric pressure of 101325Pa, which will cause noise and jitter. By designing a pressure compensation valve, external air pressure can be added to the main valve body to reduce the noise generated during unloading.

[0048] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0049] In addition, in the present utility model, descriptions such as "first", "second", "A", "B", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. In the description of the present utility model, the meaning of "several" and "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "couple", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An electromagnetic unloading valve, characterized in that: include: A main valve body (1), the main valve body (1) can also be connected to a solenoid valve, the main valve body (1) has a pump connection port (11), a liquid outlet (12) and an unloading liquid return port (13), the main valve body (1) defines a first flow channel (A) and a second flow channel (B), the first flow channel (A) is connected to the pump connection port (11) and the liquid outlet (12), and the second flow channel (B) is connected to the pump connection port (11) and the unloading liquid return port (13); a liquid outlet valve (2), the liquid outlet valve (2) being in communication with the first flow channel (A), the liquid outlet valve (2) comprising a liquid outlet valve sleeve (21), a liquid outlet valve core (22) and a valve core spring (23); the liquid outlet valve sleeve (21) being installed in the first flow channel (A), and a liquid outlet valve port (211) which is in communication with the flow channel is provided on the peripheral wall of the valve sleeve; the liquid outlet valve core (22) is movably arranged in the liquid outlet valve sleeve (21) to open or close the liquid outlet valve port (211), thereby controlling the on / off of the liquid outlet port (12); the valve core spring (23) can drive the liquid outlet valve core (22) to close the liquid outlet valve port (211); The unloading valve (3) is connected to the second flow channel (B). The unloading valve (3) comprises an unloading valve sleeve (31), an unloading valve core (32) and a second valve core spring (33). The unloading valve sleeve (31) is installed in the second flow channel (B), and a circumferential wall of the valve sleeve also comprises an unloading valve port (311) which is connected to the flow channel. The unloading valve core (32) is movably arranged in the unloading valve sleeve (31) to open or close the unloading valve port (311), thereby controlling the opening and closing of the unloading liquid return port (13). The outer circumferential wall of the core head of the unloading valve core (32) also comprises an annular groove (321). When the annular groove (321) is opposite to the unloading valve port (311), the unloading valve core (32) is connected. The second valve core spring (33) can drive the unloading valve core (32) to close the unloading valve port (311).

2. The electromagnetic unloading valve according to claim 1, characterized in that: The main valve body (1) is provided with a liquid inlet channel (14) and a liquid outlet channel (15) which are connected in the front-to-back direction; the pump port (11) is opened at the port of the liquid inlet channel (14); and the liquid outlet port (12) is opened at the port of the liquid outlet channel (15); the first channel (A) is a longitudinal channel which is arranged in the up-down direction; the first channel (A) passes through the liquid outlet channel (15) and is connected to the middle of the liquid inlet channel (14); the liquid outlet valve sleeve (21) is longitudinally installed in the first channel (A); the second channel (B) is a transverse channel which is arranged in the left-right direction and is connected to the middle of the liquid inlet channel (14); the unloading valve sleeve (31) is transversely installed in the second channel (B).

3. An electromagnetic unloading valve according to claim 1 or 2, characterized in that: The main valve body (1) is provided with an installation opening (16) at the outer end of each flow channel, and the valve sleeve is inserted into the corresponding flow channel through the installation opening (16) and is limited by the cooperation of the retaining ring (41) and the valve seat (42). The valve seat (42) is detachably mounted on the outside of the main valve body (1) and is abutted against the outer end surface of the corresponding valve sleeve. The retaining ring (41) is arranged in the flow channel and is abutted against the inner end surface of the corresponding valve sleeve. The valve core spring is also abutted between the valve seat (42) and the corresponding valve core. The retaining ring (41) can also contact the core head of the valve core to limit the movement of the valve core.

4. The electromagnetic unloading valve according to claim 3, characterized in that: The valve sleeve comprises a base (a1) and a valve mouth portion (a2) extending from the base (a1); the valve mouth is arranged on the valve mouth portion (a2); the outer diameter of the valve mouth portion (a2) is smaller than the base (a1), so that a gap (C1) exists between the valve mouth and the inner wall of the corresponding flow channel; a sealing ring (51) forms a seal between the base and the inner wall of the flow channel; and a sealing ring (52) forms a seal between the base (a1) and the valve seat (42).

5. The electromagnetic unloading valve according to claim 1 or 2, characterized in that: A plurality of valve ports are formed on the circumference of each valve sleeve.

6. The electromagnetic unloading valve according to claim 1 or 2, characterized in that: The main valve body (1) is also provided with a pressure compensation air passage (D), and the pressure compensation air passage (D) is connected to a pressure compensation valve (6). The pressure compensation valve (6) has an intake valve sleeve (61), a valve ball (62) and a valve ball spring (63). The intake valve sleeve (61) has an intake port (611) and an outlet port (612) at both ends. The intake port (611) is connected to the external air, and the outlet port (612) is connected to the internal pressure compensation air passage (D). The valve ball (62) is movably arranged in the intake valve sleeve (61) to open or close the intake port (611), thereby controlling the connection and disconnection of the intake port (611) and the pressure compensation air passage (D). The valve ball spring (63) can drive the valve ball (62) to close the intake port outward.

7. The electromagnetic unloading valve according to claim 6, characterized in that: The air inlet (611) is also provided with a conical surface (6111) that cooperates with the valve ball (62).

8. The electromagnetic unloading valve according to claim 6, characterized in that: The main valve body (1) is provided with a second installation port (17) at the outer end of the pressure compensation air passage (D). The air intake valve sleeve (61) is inserted into the second installation port (17) and is pressed against a limit surface (171) on the inner wall of the second installation port (17) via an air nozzle (64). A seal is formed between the air intake valve sleeve (61) and the inner wall of the second installation port (17) via a sealing ring (53). A stopper (65) is also pressed between the limit surface (171) and the air intake valve sleeve (61). The valve ball spring (63) is arranged between the stopper (65) and the valve ball (62).

9. The electromagnetic unloading valve according to claim 8, characterized in that: The inner wall of the air outlet (612) of the air inlet valve sleeve is also provided with a notch (6121), and the outer edge of the abutment (65) abuts against the notch (6121) via the limiting surface (171), and a gap (C2) exists between the outer edge of the abutment (65) and the inner wall of the air outlet (612).

10. The electromagnetic unloading valve according to claim 8, characterized in that: The gas nozzle (64) is also blocked by a valve cover (66), and the valve cover (66) is detachable.

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