CN112610706A - Pilot-operated type ultralow-temperature electromagnetic valve and use method thereof - Google Patents

Abstract

The invention discloses a pilot-operated type ultralow-temperature electromagnetic valve, which relates to the technical field of ultralow-temperature gas storage devices and comprises the following components: pilot valve assembly, transition assembly, main valve assembly. After the pilot valve assembly and the main valve assembly are separated, the transition assembly is connected with the pilot valve assembly and the main valve assembly, on one hand, the pilot valve port and the piston are rearranged, the situation that the pilot valve port and the piston are in the same moving assembly is avoided, and therefore the stroke of the moving core is not influenced by the stroke of the piston and is only related to the diameter of the pilot valve port. The stroke of the movable core can be effectively reduced, the electromagnetic attraction is improved, and the problem that the stroke and the electromagnetic attraction of the movable core are influenced after the nominal drift diameter of a pilot electromagnetic valve is increased in the prior art is solved; on the other hand, through increasing the transition subassembly, can also further cut apart the stress that the motion produced, reduce the movable core and receive the influence of skew because of impact stress, and then reduce the movable core and receive the friction influence, finally effectively reduce the movable core stroke.

Description

Pilot-operated type ultralow-temperature electromagnetic valve and use method thereof

Technical Field

The invention relates to the technical field of ultralow-temperature gas storage devices, in particular to a pilot-operated ultralow-temperature electromagnetic valve.

Background

The electromagnetic valve is an industrial device controlled by electromagnetism, is an automatic basic element for controlling fluid, belongs to an actuator, and is not limited to hydraulic pressure and pneumatic pressure. Used in industrial control systems to regulate the direction, flow, velocity and other parameters of a medium. The solenoid valve can be matched with different circuits to realize expected control, and the control precision and flexibility can be ensured. There are many types of solenoid valves, with different solenoid valves functioning at different locations in the control system, the most common being one-way valves, safety valves, directional control valves, speed control valves, etc.

The pilot electromagnetic valve is internally provided with a closed cavity, through holes are formed in different positions, each hole is connected with different pipelines, a piston is arranged in the middle of the cavity, two electromagnets are arranged on two sides of the cavity, and the magnet coil on which side is electrified, the piston can be attracted to which side, so that the valve guide port is opened or closed by controlling the movement of the piston to control air inlet and air outlet.

However, in the current pilot-operated solenoid valve, the pilot valve port and the piston are in the same moving assembly, and for a large-caliber solenoid valve, the piston is large, so that the opening height of the main valve port meets the requirement (the piston can be sucked up for ensuring), the stroke of the moving assembly is also large, the stroke of the movable iron core is increased at the same time, the electromagnetic suction force is reduced sharply along with the increase of the stroke, the control movement of the piston is greatly influenced, and the failure phenomenon of the pilot-operated solenoid valve can be caused.

Disclosure of Invention

The invention aims to solve the problem that in the prior art, after the caliber of a pilot type electromagnetic valve is increased, the stroke of a movable iron core is also increased, and the electromagnetic attraction is further influenced.

The second purpose of the invention is to provide a using method of the pilot-operated type ultralow temperature electromagnetic valve.

In order to achieve one of the purposes, the invention adopts the following technical scheme: a pilot-operated, ultra-low temperature solenoid valve, comprising: pilot valve assembly, transition assembly, main valve assembly.

The pilot valve assembly has: guide valve seat, movable core, elastic component, quiet core, coil. The valve seat is internally provided with a stroke cavity and a sealing cavity, the upper part of the movable core is arranged in the stroke cavity in a sliding mode, and the lower part of the movable core extends into the sealing cavity. The elastic piece is installed in the seal cavity, the seal piece is connected with the movable core, the static core is fixedly installed in the stroke cavity, and the static core is located above the movable core. The coil is fixed on the valve seat and is positioned outside the static core.

The transition assembly has a transition seat coupled to the valve seat, the transition seat having: first air flue, lead valve mouth, second air flue. The first air passage is communicated with the sealing cavity, the valve guide port is communicated with the sealing cavity, the second air passage is communicated with the valve guide port, the valve guide port is blocked by the movable core, when the coil is electrified, the movable core moves towards the static core under the action of electromagnetic attraction and is finally attracted, and at the moment, the valve guide port is opened; after the power failure, the movable core returns under the action of the elastic part to close the valve guide port.

The main valve assembly has: main valve seat, piston, pressure bullet spare. The main valve seat is provided with a pressure cavity and a main valve port, the pressure cavity is communicated with the main valve port, the main valve seat is provided with an inlet and an outlet, the inlet is communicated with the pressure cavity, and the outlet is communicated with the main valve port and the second air passage.

The piston is movably arranged in the pressure cavity, the pressure elastic piece is installed in the pressure cavity and connected with the piston, and the piston abuts against the main valve opening through the elastic acting force of the pressure elastic piece so as to seal the main valve opening.

In the technical scheme, when the electromagnetic suction valve is used, electricity is introduced into the coil on the side of the static core, so that the movable core slides along the stroke cavity under the action of electromagnetic attraction and is attracted with the static core, the elastic part is compressed in the sliding process of the movable core, the movable core is far away from the valve guide port on the transition seat, and the valve guide port is opened so as to be communicated with the sealing cavity;

after the valve guide port is opened under the action of electromagnetic force, a medium in a pressure cavity above a piston in the main valve component enters the sealing cavity through the first air passage, then sequentially enters the valve guide port and the second air passage through the sealing cavity, and finally is discharged from the outlet;

after the medium in the pressure cavity is discharged from the outlet, the air pressure in the pressure cavity above the piston is reduced, and under the action of pressure difference, the piston moves upwards to compress the pressure elastic piece and open the main valve port, so that the fluid enters from the inlet and is discharged from the outlet after passing through the main valve port.

Further, in the embodiment of the present invention, the moving core and the static core are made of magnets.

Further, in the embodiment of the invention, a gap is formed between the movable core and the static core.

Further, in an embodiment of the present invention, the pilot valve assembly also has a pilot valve seal embedded in the moving core bottom notch, the pilot valve seal being secured in the moving core bottom notch by a pilot valve gasket.

Still further, in an embodiment of the present invention, a balance spring is disposed between the bottom notch of the moving core and the pilot valve seal.

Further, in the embodiment of the present invention, a connection passage communicating with the second air passage is provided below the second air passage, and the connection passage communicates with the outlet through a docking passage in the main valve assembly.

Further, in an embodiment of the present invention, the pilot valve assembly further has a nut mounted on the pilot valve seat, the nut securing the coil to the pilot valve seat via a flat washer.

Further, in the embodiment of the invention, an anti-leakage channel is arranged on the right side of the second air channel, and a ball plug is arranged in the anti-leakage channel to prevent the medium from leaking out of the anti-leakage channel.

Further, in an embodiment of the present invention, the main valve assembly further has a main valve sealing member fixed to the piston bottom by a main valve gasket, the main valve sealing member being located on the main valve port.

Further, in the embodiment of the present invention, a sealing member is used for sealing between the guide valve seat and the transition seat to prevent leakage from inside and outside, the transition seat is fixed on the main valve seat by a screw, and a sealing ring is used for sealing between the transition seat and the main valve seat to prevent leakage from inside and outside.

The invention has the beneficial effects that:

according to the invention, after the pilot valve assembly and the main valve assembly are separated, the pilot valve assembly and the main valve assembly are connected through the transition assembly groove, on one hand, the pilot valve port and the piston are rearranged, and the situation that the pilot valve port and the piston are in the same moving assembly is avoided, so that the stroke of the moving core is not influenced by the stroke of the piston and is only related to the diameter of the pilot valve port. The stroke of the movable core can be effectively reduced, the electromagnetic attraction is improved, and the problem that the stroke and the electromagnetic attraction of the movable core are influenced after the nominal drift diameter of a pilot electromagnetic valve is increased in the prior art is solved; on the other hand, through increasing the transition subassembly, can also further cut apart the stress that the motion produced, reduce the movable core and receive the influence of skew because of impact stress, and then reduce the movable core and receive the friction influence, finally effectively reduce the movable core stroke.

In addition, the electromagnetic valves with different calibers can use the same electromagnetic driving part, so that the universality of parts can be improved, and the production management cost of enterprises can be reduced.

In order to achieve the second purpose, the invention adopts the following technical scheme: a use method of a pilot-operated type ultralow-temperature electromagnetic valve comprises the following steps:

the electricity is conducted to the coil on the side of the static core, so that the movable core slides along the stroke cavity under the action of the electromagnetic attraction force and is attracted with the static core, the elastic part is compressed in the sliding process of the movable core, the movable core is far away from the valve port on the transition seat, and the valve port is opened so that the valve port is communicated with the sealing cavity;

after the valve guide port is opened under the action of electromagnetic force, a medium in a pressure cavity above a piston in the main valve component enters the sealing cavity through the first air passage, then sequentially enters the valve guide port and the second air passage through the sealing cavity, and finally is discharged from the outlet;

after the medium in the pressure cavity is discharged from the outlet, the air pressure in the pressure cavity above the piston is reduced, and under the action of pressure difference, the piston moves upwards to compress the pressure elastic piece and open the main valve port, so that the fluid enters from the inlet and is discharged from the outlet after passing through the main valve port.

Drawings

Fig. 1 is a schematic structural diagram of a pilot-operated ultralow-temperature electromagnetic valve according to an embodiment of the invention.

Fig. 2 is a schematic top view of a pilot-operated ultra-low temperature solenoid valve according to an embodiment of the present invention.

Fig. 3 is a schematic perspective view of a transition assembly according to an embodiment of the present invention.

Fig. 4 is a schematic perspective view of a main valve assembly according to an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a ball plug according to an embodiment of the present invention.

In the attached drawings

10. Pilot valve assembly 11, pilot valve seat 111, stroke chamber

112. Sealing cavity 12, movable core 13 and elastic piece

14. Static core 15, coil 16, pilot valve seal

17. Balance spring 18, nut 19 and flat washer

20. Transition assembly 21, transition seat 22, first air duct

23. Guide valve port 24, second air passage 241 and connecting passage

25. Ball plug 26 and screw

30. Main valve assembly 31, main valve seat 311, pressure chamber

312. Main valve port 313, inlet 314, outlet

315. Butt channel 32, piston 33, pressure spring

34. Main valve sealing member

251. Pressure receiving portion 252, air bag 253, and ventilation tube

254. Expansion sleeve

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clear and fully described, embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of some embodiments of the invention and are not limiting of the invention, and that all other embodiments obtained by those of ordinary skill in the art without the exercise of inventive faculty are within the scope of the invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "a," "an," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

For the purposes of simplicity and explanation, the principles of the embodiments are described by referring mainly to examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. But it is obvious. To one of ordinary skill in the art, the embodiments may be practiced without limitation to these specific details. In some instances, methods of use and structures of known pilot-operated, ultra-low temperature solenoid valves are not described in detail to avoid unnecessarily obscuring the embodiments. In addition, all embodiments may be used in combination with each other.

The first embodiment is as follows:

a pilot-operated ultra-low-temperature electromagnetic valve, as shown in fig. 1, comprising: a pilot valve assembly 10, a transition assembly 20, a main valve assembly 30.

As shown in fig. 1, the pilot valve assembly 10 has: the guide valve seat 11, the movable core 12, the elastic element 13, the static core 14 and the coil 15.

The valve seat is provided with a stroke cavity 111 and a sealing cavity 112, the upper part of the movable core 12 is arranged in the stroke cavity 111 in a sliding mode, and the lower part of the movable core 12 extends into the sealing cavity 112. The elastic element 13 is arranged in the sealing cavity 112, the sealing element is connected with the movable core 12, the static core 14 is fixedly arranged in the stroke cavity 111, the static core 14 is positioned above the movable core 12, the movable core 12 and the static core 14 are made of magnets, and a gap is formed between the movable core 12 and the static core 14. The coil 15 is fixed on the valve seat, and the coil 15 is positioned outside the stationary core 14.

As shown in fig. 1 and 3, the transition assembly 20 has a transition seat 21, the transition seat 21 is connected to the valve seat, and the transition seat 21 has: a first gas passage 22, a pilot valve port 23, and a second gas passage 24.

The first air passage 22 is communicated with the sealing cavity 112, the pilot valve port 23 is communicated with the sealing cavity 112, the second air passage 24 is communicated with the pilot valve port 23, the pilot valve port 23 is blocked by the movable core 12, when the coil 15 is electrified, the movable core 12 moves towards the static core 14 under the action of electromagnetic attraction and is finally attracted, and at the moment, the pilot valve port 23 is opened; after the power failure, the movable core 12 returns under the action of the elastic element 13, and the pilot valve port 23 is closed.

As shown in fig. 2 and 4, the main valve assembly 30 includes: main valve seat 31, piston 32, pressure spring 33.

The main valve seat 31 has a pressure chamber 311 and a main valve port 312, the pressure chamber 311 communicates with the main valve port 312, the main valve seat 31 has an inlet 313 and an outlet 314, the inlet 313 communicates with the pressure chamber 311, and the outlet 314 communicates with the main valve port 312 and the second air passage 24.

The piston 32 is movably disposed in the pressure chamber 311, the pressure spring 33 is installed in the pressure chamber 311, the pressure spring 33 is connected to the piston 32, and the piston 32 abuts against the main valve port 312 by the elastic force of the pressure spring 33 to seal the main valve port 312.

The implementation steps are as follows: the electricity is conducted to the coil 15 at the side of the static core 14, so that the movable core 12 slides along the stroke cavity 111 under the action of the electromagnetic attraction force and is attracted with the static core 14, the elastic part 13 is compressed in the sliding process of the movable core 12 and is far away from the pilot valve port 23 on the transition seat 21, and the pilot valve port 23 is opened, so that the pilot valve port 23 is communicated with the sealing cavity 112;

after the pilot valve port 23 is opened under the action of electromagnetic force, the medium in the pressure chamber 311 above the piston 32 in the main valve assembly 30 enters the sealing chamber 112 through the first air passage 22, then sequentially enters the pilot valve port 23 and the second air passage 24 through the sealing chamber 112, and finally is discharged from the outlet 314;

after the medium in the pressure chamber 311 is discharged from the outlet 314, the air pressure in the pressure chamber 311 above the piston 32 is reduced, and under the action of the pressure difference, the piston 32 moves upward to compress the pressure spring 33 and open the main valve port 312, so that the fluid (air or oil) enters from the inlet 313, passes through the main valve port 312 and is discharged from the outlet 314.

After the pilot valve assembly 10 is separated from the main valve assembly 30, the transition assembly 20 is used for connecting the pilot valve assembly 10 with the main valve assembly 30, on one hand, the pilot valve port 23 and the piston 32 are rearranged to avoid the situation that the pilot valve port 23 and the piston 32 are in the same moving assembly, so that the stroke of the movable core 12 is not influenced by the stroke of the piston 32 and is only related to the diameter of the pilot valve port 23. The stroke of the movable core 12 can be effectively reduced, the electromagnetic attraction is improved, and the problem that the stroke and the electromagnetic attraction of the movable core 12 are influenced after the nominal drift diameter of a pilot electromagnetic valve is increased in the prior art is solved; on the other hand, by adding the transition assembly 20, the stress generated by the movement can be further divided, the influence of the offset of the movable core 12 caused by impact stress is reduced, the influence of the friction of the movable core 12 is further reduced, and finally the stroke of the movable core 12 is effectively reduced.

In addition, the electromagnetic valves with different calibers can use the same electromagnetic driving part, so that the universality of parts can be improved, and the production management cost of enterprises can be reduced.

Preferably, as shown in FIG. 1, the pilot valve assembly 10 also has a pilot valve seal 16, the pilot valve seal 16 being inset into a bottom recess of the moving core 12, the pilot valve seal 16 being secured in the bottom recess of the moving core 12 by a pilot valve gasket. A balance spring 17 is arranged between the notch at the bottom of the moving core 12 and the sealing piece 16 of the pilot valve.

An annular inner groove is arranged at the side of the valve guide port 23, the size of a notch at the bottom of the movable core 12 is matched with that of the valve guide port 23, and the outer contour of the side at the bottom of the movable core 12 is matched with that of the inner groove.

After the coil 15 is powered off, the movable core 12 on the pilot valve port 23 is pushed by the elastic element 13 to reset, so that the movable core inevitably collides with the pilot valve port 23, and the sealing of the pilot valve port 23 and the electromagnetic attraction are possibly influenced finally. In order to solve the problem, when the power is off and reset, the pilot valve sealing piece 16 can collide with the pilot valve port 23, the balance spring 17 plays a buffering role, the deformation of the pilot valve sealing piece 16 is reduced, the durability is improved, and the sealing of the pilot valve port 23 is prevented from being influenced; in addition, the annular projection has two functions: the first is to control the stroke of the guide valve port 23, the lower surface of the movable core 12 will stop moving after contacting with the upper surface of the protrusion, thereby controlling the position when the movable core 12 is closed, and the second is to guide the movable core 12, the lower surface of the movable core 12 is in surface contact with the upper surface of the protrusion, so that the movable core 12 can be pressed vertically to seal the guide valve port 23.

Preferably, a connection passage 241 communicating with the second air passage 24 is provided below the second air passage 24, and the connection passage 241 communicates with the outlet 314 through a docking passage 315 in the main valve assembly 30.

Preferably, the pilot valve assembly 10 also has a nut 18, the nut 18 being mounted on the pilot valve seat 11, the nut 18 securing the coil 15 to the pilot valve seat 11 by a flat washer 19.

Preferably, as shown in fig. 2, a leakage-proof channel is provided at the right side of the second air passage 24, and a ball plug 25 is provided in the leakage-proof channel to prevent the medium from leaking out of the leakage-proof channel.

As shown in fig. 5, the ball plug 25 has a pressure receiving portion 251 at the left end, the pressure receiving portion 251 contacts with an air bag 252 in the ball plug 25, the air bag 252 communicates with an air duct 253 in the ball plug 25, an annular expansion sleeve 254 is provided on the right side of the ball plug 25, and the air duct 253 is covered by the expansion sleeve 254.

When the medium flows from the second air passage 24, so that the pressure of the second air passage 24 is increased, the pressure-receiving portion 251 of the ball plug 25 in the leakage-proof passage is forced to push the air bag 252 to compress, so that the air in the air bag 252 flows into the vent pipe 253, and finally the expansion sleeve 254 is pushed, so that the expansion sleeve 254 is in pressing contact with the leakage-proof passage, the sealing effect of the plugging ball is enhanced, and the problem that the medium leaks due to the fact that the ball plug 25 cannot be sealed is avoided.

Preferably, the main valve assembly 30 also has a main valve seal 34, the main valve seal 34 being secured to the bottom of the piston 32 by a main valve gasket, the main valve seal 34 being located on the main valve port 312.

Preferably, as shown in fig. 2, a seal is used between the pilot valve seat 11 and the transition seat 21 to prevent leakage from inside and outside, the transition seat 21 is fixed on the main valve seat 31 by a screw 26, and a seal ring is used between the transition seat 21 and the main valve seat 31 to prevent leakage from inside and outside.

Example two:

a use method of a pilot-operated type ultralow-temperature electromagnetic valve comprises the following steps:

the electricity is conducted to the coil 15 at the side of the static core 14, so that the movable core 12 slides along the stroke cavity 111 under the action of the electromagnetic attraction force and is attracted with the static core 14, the elastic part 13 is compressed in the sliding process of the movable core 12 and is far away from the pilot valve port 23 on the transition seat 21, and the pilot valve port 23 is opened, so that the pilot valve port 23 is communicated with the sealing cavity 112;

after the pilot valve port 23 is opened under the action of electromagnetic force, the medium in the pressure chamber 311 above the piston 32 in the main valve assembly 30 enters the sealing chamber 112 through the first air passage 22, then sequentially enters the pilot valve port 23 and the second air passage 24 through the sealing chamber 112, and finally is discharged from the outlet 314;

after the medium in the pressure chamber 311 is discharged from the outlet 314, the air pressure in the pressure chamber 311 above the piston 32 is reduced, and under the action of the pressure difference, the piston 32 moves upward to compress the pressure spring 33 and open the main valve port 312, so that the fluid enters from the inlet 313, passes through the main valve port 312 and is discharged from the outlet 314.

Preferably, when the power is off and the valve is reset, the pilot valve sealing piece 16 can collide with the pilot valve port 23, the balance spring 17 plays a role in buffering, the deformation amount of the pilot valve sealing piece 16 is reduced, the durability is improved, and the sealing of the pilot valve port 23 is prevented from being influenced. In addition, through the stroke of the annular bulge control guide valve port 23, the lower surface of the movable core 12 is in contact with the upper surface of the bulge and stops moving, so that the position of the movable core 12 when being closed is controlled, meanwhile, the movable core 12 is guided and corrected through the annular bulge, the lower surface of the movable core 12 is in surface contact with the upper surface of the bulge, and the movable core 12 is vertically pressed down to seal the guide valve port 23.

Although the illustrative embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, the present invention is not limited to the scope of the embodiments, and it is apparent to those skilled in the art that all the inventive concepts using the present invention are protected as long as they can be changed within the spirit and scope of the present invention as defined and defined by the appended claims.

Claims (10)

1. A pilot-operated, ultra-low temperature solenoid valve, comprising:

a pilot valve assembly having:

a pilot valve seat having a travel chamber and the seal chamber therein;

the upper part of the movable core is arranged in the stroke cavity in a sliding manner, and the lower part of the movable core extends into the sealing cavity;

the elastic piece is arranged in the sealing cavity, and the sealing piece is connected with the movable core;

the static core is fixedly arranged in the stroke cavity and is positioned above the movable core;

the coil is fixed on the valve seat and is positioned outside the static core;

a transition assembly having:

a transition seat coupled to the valve seat, the transition seat having:

the first air passage is communicated with the sealing cavity;

the guide valve port is communicated with the seal cavity and is blocked by the movable core;

a second air passage in communication with the pilot valve port;

a main valve assembly having:

a main valve seat having a pressure chamber and a main valve port, the pressure chamber communicating with the main valve port, the main valve seat having an inlet and an outlet, the inlet communicating with the pressure chamber, the outlet communicating with the main valve port and the second air passage;

the piston is movably arranged in the pressure cavity;

the pressure elastic piece is installed in the pressure cavity and connected with the piston, and the piston abuts against the main valve port through the elastic acting force of the pressure elastic piece so as to seal the main valve port.

2. The piloted, ultra-low temperature solenoid valve of claim 1, wherein the moving core and the stationary core are made of magnets.

3. The piloted ultra-low temperature solenoid valve of claim 1, wherein the moving core and the stationary core have a clearance therebetween.

4. The pilot ultra-low temperature solenoid valve of claim 1 wherein the pilot valve assembly further has a pilot valve seal embedded in the moving core bottom notch, the pilot valve seal being secured in the moving core bottom notch by a pilot valve gasket.

5. The piloted, ultra-low temperature solenoid valve of claim 4, wherein a balancing spring is disposed between the moving core bottom notch and the pilot valve seal.

6. The piloted, ultra-low temperature solenoid valve of claim 1, wherein a connecting passage is provided under the secondary air passage in communication with the secondary air passage, the connecting passage communicating with the outlet through a docking passage in the main valve assembly.

7. The piloted, ultra-low temperature solenoid valve of claim 1, wherein the pilot valve assembly further has a nut mounted on the pilot valve seat, the nut securing the coil to the pilot valve seat with a flat washer.

8. The piloted, ultra-low temperature solenoid valve of claim 1, wherein the main valve assembly further has a main valve seal secured to the piston base by a main valve gasket, the main valve seal being located on the main valve port.

9. The pilot-operated ultra-low temperature solenoid valve as claimed in claim 1, wherein the pilot valve seat is sealed with the transition seat by a sealing member, the transition seat is fixed on the main valve seat by a screw, and the transition seat is sealed with the main valve seat by a sealing ring.

10. A use method of a pilot-operated type ultralow-temperature electromagnetic valve comprises the following steps:

the electricity is conducted to the coil on the side of the static core, so that the movable core slides along the stroke cavity under the action of the electromagnetic attraction force and is attracted with the static core, the elastic part is compressed in the sliding process of the movable core, the movable core is far away from the valve port on the transition seat, and the valve port is opened so that the valve port is communicated with the sealing cavity;

after the valve guide port is opened under the action of electromagnetic force, a medium in a pressure cavity above a piston in the main valve component enters the sealing cavity through the first air passage, then sequentially enters the valve guide port and the second air passage through the sealing cavity, and finally is discharged from the outlet;

after the medium in the pressure cavity is discharged from the outlet, the air pressure in the pressure cavity above the piston is reduced, and under the action of pressure difference, the piston moves upwards to compress the pressure elastic piece and open the main valve port, so that the fluid enters from the inlet and is discharged from the outlet after passing through the main valve port.

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