Line control valve

Abstract

Disclose a pipeline control valve, pipeline control valve include solenoid housing, solen coil, solenoid upper fixed iron, solenoid lower fixed iron, solenoid spring, solenoid moving iron, solenoid spool, solenoid small valve hole sealant, solenoid sleeve, solenoid small valve seat, solenoid big valve hole sealant, solenoid big valve seat, solenoid mounting seat, outlet joint, high-low pressure cavity isolation seal ring, solenoid fixing screw and inlet joint, when solenoid is not electrified, the gap between solenoid moving iron and solenoid upper fixed iron is provided with the total stroke of solenoid moving iron, the bottom surface of solenoid sleeve upturned edge and the top surface between solenoid spool shaft shoulder are provided with a gap, the head of solenoid fixing screw is inserted into the radial hole of solenoid big valve seat and solenoid is fixed in the hole of solenoid mounting seat.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic valve technology, and in particular to a pipeline control valve. Background Technology

[0002] With increasingly stringent emission requirements and the need for energy diversification, the application of clean fuels in automobiles is showing strong development potential. Hydrogen fuel, in particular, achieves true zero emissions because its only emission is water, enabling its application in hydrogen engine vehicles or hydrogen fuel cell vehicles. Hydrogen fuel is stored in high-pressure tanks in vehicles, connected to the hydrogen-using device via pipelines. A solenoid valve is installed on the pipeline to control the opening and closing of the gas path. The stroke of the solenoid valve's moving iron determines the size of the valve opening, thus determining the flow rate. The hydrogen pressure required by the hydrogen-using device is relatively low, resulting in a large pressure difference between the inlet and outlet of the solenoid valve. This necessitates a significant driving force to open the pipeline control valve. As is known from established theory, the driving electromagnetic force of the solenoid valve... The stroke of the solenoid valve is approximately proportional to the reciprocal of the square of the solenoid valve's moving iron stroke. For a control valve to achieve a large flow rate, the solenoid valve's moving iron stroke needs to be sufficiently large. However, a large moving iron stroke results in a weaker solenoid valve driving electromagnetic force. Using a conventional single-stroke solenoid valve requires a larger coil size to obtain sufficient magnetomotive force to ensure reliable valve opening. Limited installation space in automobiles restricts the external dimensions of the control valve, limiting the application of conventional single-stroke solenoid valves. Furthermore, the traditional method of installing solenoid valves involves setting a fixed bracket on the solenoid valve housing and setting a fixing screw hole on the solenoid valve mounting base to lock the solenoid valve mounting bracket with screws. This mounting method, which involves setting a fixed bracket on the solenoid valve housing, requires a large lateral space and cannot be used in compact, space-constrained applications.

[0003] The information disclosed in the background section is only intended to enhance the understanding of the background of the present invention, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention proposes a pipeline control valve that features dual stroke, large flow rate, high working pressure, and suitability for compact applications with limited space.

[0005] The objective of this invention is achieved through the following technical solution: a pipeline control valve includes:

[0006] The solenoid valve coil has a convex ring at its lower end.

[0007] The lower stationary iron of the solenoid valve is located below the solenoid valve coil. The lower stationary iron includes a central through hole, a lower countersunk hole at the bottom of the central through hole, and an upper annular groove and a lower annular groove surrounding the central through hole. The convex ring extends into the upper annular groove and is sealed by a sealing ring.

[0008] The upper stationary iron of the solenoid valve is located above the solenoid valve coil. The solenoid valve coil, the upper stationary iron, and the lower stationary iron form an integral structure.

[0009] The solenoid valve moving iron is installed within the central through hole, and the solenoid valve moving iron has a central through hole.

[0010] The solenoid valve core is tightly fitted and fixed within the central bore, and the solenoid valve core includes a shoulder protruding outward perpendicular to the axial direction.

[0011] The solenoid valve spring is installed between the upper fixed iron and the moving iron of the solenoid valve. One end of the spring is connected to the valve core, and the other end is connected to the upper fixed iron. When the solenoid valve coil is not energized, the spring force pushes the moving iron away from the upper fixed iron, forming the initial clearance δ of the total stroke of the moving iron. The lower end of the valve core is sealed with sealant for the small valve orifice.

[0012] The solenoid valve sleeve is fitted onto the solenoid valve core. The solenoid valve sleeve includes an upper flange, a lower flange, a lower end stop, and a radial hole connecting the inner and outer air chambers of the sleeve. The upper flange is engaged with the upper part of the shoulder, and a gap δ1 is provided between the bottom surface of the upper flange and the top surface of the shoulder to form the first stage of the solenoid valve's opening stroke.

[0013] The small valve seat of the solenoid valve is installed inside the lower end stop and its lower flange is riveted to the solenoid valve slide sleeve. The small valve seat of the solenoid valve includes a small valve hole Φ1 with a first diameter in the axial direction and a recess at the lower end. The recess is filled with sealant for the large valve hole of the solenoid valve. The lower end flange of the small valve seat of the solenoid valve rivets the sealant for the large valve hole of the solenoid valve onto the small valve seat of the solenoid valve.

[0014] The large valve seat of the solenoid valve includes an axially oriented large valve hole Φ2 with a second diameter, an inner convex ring and a stop distributed along the inner wall of the large valve hole Φ2, a flow hole connecting the inner and outer air chambers of the large valve seat, a radial hole below the large valve seat, and an outlet hole. The stop is fitted onto the lower outer circle of the lower stationary iron of the solenoid valve. The inner convex ring is engaged in the lower ring groove, thereby fixing the large valve seat and the lower stationary iron of the solenoid valve into a single unit to form the solenoid valve structure. The second diameter is larger than the first diameter.

[0015] The solenoid valve mounting base includes an inlet connector mounting hole for mounting an inlet connector, a solenoid valve fixing screw hole, an outlet connector mounting hole for mounting an outlet connector, a lower solenoid valve mounting hole for mounting the solenoid valve structure, and an upper solenoid valve mounting hole. The solenoid valve fixing screw connects to the solenoid valve fixing screw hole and extends into a radial hole below the large valve seat of the solenoid valve.

[0016] Air enters the solenoid valve mounting base from the inlet connector, passes through the flow hole into the inner cavity of the large valve seat of the solenoid valve, and then enters the air cavity around the small valve hole Φ1 through the radial hole of the sliding sleeve from the lower countersunk hole. The outlet hole is connected to the outlet connector.

[0017] In the aforementioned pipeline control valve, when the solenoid valve coil is not energized, the sealing force acting on the sealant of the large valve orifice of the solenoid valve is the force exerted by the pressure difference between the upper and lower parts of the large valve orifice on the Φ2 cross section plus the spring force of the solenoid valve spring. The sealing force acting on the sealant of the small valve orifice of the solenoid valve is the force exerted by the pressure difference between the upper and lower parts of the small valve orifice on the Φ1 cross section plus the spring force of the solenoid valve spring. The cross section of the small valve orifice Φ1 is smaller than the cross section of the large valve orifice Φ2.

[0018] In the aforementioned pipeline control valve, when the solenoid valve coil is energized and there is an initial gap δ between the moving iron and the fixed iron of the solenoid valve, the electromagnetic driving force acting on the moving iron is less than the sealing force acting on the sealant of the large valve orifice but greater than the sealing force acting on the sealant of the small valve orifice. This electromagnetic driving force causes the moving iron to move upwards. The moving iron then drives the valve core and the sealant of the small valve orifice upwards until the top surface of the shoulder abuts against the bottom surface of the upturned edge. The moving iron then moves the valve core and the sealant of the small valve orifice upwards by the first opening stroke gap δ1, thus opening the inlet of the small valve orifice Φ1. An opening with a width equal to the gap δ1 is opened on the end face. The air inlet channel of the small valve hole Φ1 is formed by the air inlet hole of the inlet connector, the mounting hole on the solenoid valve, the flow hole, the inner cavity of the large valve seat of the solenoid valve, the lower countersunk hole, the radial hole of the sliding sleeve, and the air passage from the air cavity above the small valve hole Φ1 to the small valve hole Φ1. The high-pressure air in the air cavity above the small valve hole Φ1 flows into the outlet hole from the small valve hole Φ1, thereby reducing the pressure difference between the air inlet and outlet sides of the sealant of the large valve hole of the solenoid valve. Furthermore, the area of ​​the pressure difference between the air inlet and outlet sides of the sealant of the large valve hole of the solenoid valve acting on the sealant of the large valve hole of the solenoid valve is reduced due to the opening of the small valve hole Φ1.

[0019] In the aforementioned pipeline control valve, after the moving iron of the solenoid valve engages the gap δ1 of the first opening stroke, the electromagnetic driving force it receives at the beginning of the second opening stroke increases. This causes the moving iron to move the valve core and the sealant of the small valve orifice of the solenoid valve, reducing the pressure difference between the inlet and outlet sides of the sealant in the large valve orifice and decreasing the pressure area acting on the sealant. Furthermore, the increased driving electromagnetic force on the moving iron at the beginning of the second opening stroke makes the driving force on the moving iron greater than the force acting on the valve core. The sealing force on the sealant in the large valve orifice of the solenoid valve causes the moving iron of the solenoid valve to move upward, along with the valve core, the sealant in the small valve orifice, the sliding sleeve, the small valve seat, and the sealant in the large valve orifice until the top surface of the moving iron abuts against the bottom surface of the fixed iron. The moving iron then moves the valve core, the sealant in the small valve orifice, the sliding sleeve, the small valve seat, and the sealant in the large valve orifice upward by the gap δ-δ1 of the second opening stroke, thus opening an opening δ-δ1 wide at the inlet end face of the large valve orifice Φ2.

[0020] In the aforementioned pipeline control valve, after the solenoid valve coil is de-energized, the electromagnetic force acting on the solenoid valve moving iron disappears. The pressure difference force acting on the upper and lower sides of the solenoid valve large valve hole sealant and the solenoid valve small valve hole sealant, as well as the spring force, cause the solenoid valve moving iron, solenoid valve sliding sleeve, solenoid valve small valve hole sealant, solenoid valve small valve seat, and solenoid valve large valve hole sealant to return to their original positions, thereby closing the pipeline control valve.

[0021] In the pipeline control valve, the solenoid valve core further includes a hollow axial bore and a radial bore penetrating the hollow axial bore.

[0022] In the aforementioned pipeline control valve, the solenoid valve mounting base also includes bolt holes for fixing it.

[0023] In the pipeline control valve, the large valve seat of the solenoid valve further includes a central annular groove, and a high-low pressure cavity isolation sealing ring is provided in the central annular groove of the large valve seat to isolate and seal the high and low pressure cavities between the inlet and outlet.

[0024] In the pipeline control valve, the overall structure also includes a solenoid valve housing, a solenoid valve coil installed inside the solenoid valve housing, and upper and lower fixed irons of the solenoid valve coil respectively provided above and below the solenoid valve coil, which are riveted together with the flange of the solenoid valve housing to form an integral structure.

[0025] In the pipeline control valve, a middle annular groove is provided between the upper annular groove and the lower annular groove, and a sealing ring is installed in the middle annular groove for sealing.

[0026] Compared with the prior art, the present invention has the following advantages: In the pipeline control valve of the present invention, the head of the solenoid valve fixing screw extends into the radial hole below the large valve seat of the solenoid valve to fix the solenoid valve in the solenoid valve mounting hole of the solenoid valve mounting base, thereby eliminating the need to set a fixing bracket on the solenoid valve housing to fix the solenoid valve. This overcomes the defect that the installation method of setting a fixing bracket on the solenoid valve housing requires a large lateral space and cannot be applied to compact and space-limited occasions. The working stroke of the solenoid valve is set as a double-stroke motion mechanism, realizing the reliable operation of the pipeline control valve under high working pressure and large flow rate. Attached Figure Description

[0027] Various other advantages and benefits of the present invention will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. Furthermore, the same reference numerals denote the same parts throughout the drawings.

[0028] In the attached diagram:

[0029] Figure 1 This is a schematic diagram of the structure of a pipeline control valve according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the small valve orifice of a pipeline control valve in the open state according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the fully open state of a pipeline control valve according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of a solenoid valve mounting base for a pipeline control valve according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the lower stop of the solenoid valve of a pipeline control valve according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the large valve seat of a solenoid valve for a pipeline control valve according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the solenoid valve sleeve of a pipeline control valve according to an embodiment of the present invention.

[0036] The present invention will be further explained below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0037] The following will refer to the appendix. Figures 1 to 7 Specific embodiments of the invention will be described in more detail below. While specific embodiments of the invention are shown in the accompanying drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0038] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that different terms may be used to refer to the same component. This specification and claims do not distinguish components based on differences in terminology, but rather on differences in function. The terms "comprising" or "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising but not limited to." The following descriptions are preferred embodiments for carrying out the invention; however, these descriptions are for the purpose of understanding the general principles of the specification and are not intended to limit the scope of the invention. The scope of protection of this invention is determined by the appended claims.

[0039] To facilitate understanding of the embodiments of the present invention, further explanations and descriptions will be provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings do not constitute a limitation on the embodiments of the present invention.

[0040] To better understand, such as Figures 1 to 7As shown, the pipeline control valve includes: a solenoid valve housing 1, a solenoid valve coil 2, an upper solenoid valve base 3, a lower solenoid valve base 4, a solenoid valve spring 5, a moving solenoid valve base 6, a solenoid valve core 7, a small valve orifice sealant 8, a sliding sleeve 9, a small valve seat 10, a large valve orifice sealant 11, a large valve seat 12, a solenoid valve mounting base 13, an outlet connector 14, a high and low pressure chamber isolation sealing ring 15, a solenoid valve fixing screw 16, and an inlet connector 17. The solenoid valve coil 2 is installed inside the solenoid valve housing 1. The upper and lower parts of the solenoid valve coil 2 are respectively provided with the upper solenoid valve base 3 and the lower solenoid valve base 4, which are riveted together as a whole by the flange of the solenoid valve housing 1. A raised ring 2-1 is provided at the lower end of coil 2. The lower stationary iron 4 of the solenoid valve is provided with an upper ring groove 4-1, a middle ring groove 4-2, a lower ring groove 4-3, a lower countersunk hole 4-4, and a axial through hole 4-5. The lower raised ring 2-1 of the solenoid valve coil 2 extends into the upper ring groove 4-1 of the lower stationary iron 4, and a sealing ring is provided between the lower raised ring 2-1 of the solenoid valve coil 2 and the upper ring groove 4-1 of the lower stationary iron 4 for sealing. A sealing ring is also installed in the middle ring groove 4-2 of the lower stationary iron 4 for sealing. The moving iron 6 of the solenoid valve is installed in the axial through hole 4-5 of the lower stationary iron 4. A solenoid valve spring 5 is installed between the upper stationary iron 3 and the moving iron 6. The valve core 7 of the solenoid valve is tightly fitted and fixed to the solenoid valve. Inside the axial bore of the solenoid valve moving iron 6, the elastic force of the solenoid valve spring 5 pushes the solenoid valve moving iron 6 away from the solenoid valve upper fixed iron 3 when the coil is not energized, thus forming a gap δ in the total stroke of the solenoid valve moving iron 6. A shoulder 7-1 is provided on the solenoid valve core 7, and a radial hole is provided on the solenoid valve core 7 that communicates with the axial bore of the solenoid valve core 7, thereby connecting the upper and lower areas of the solenoid valve moving iron 6 and reducing the movement resistance of the solenoid valve moving iron 6. A solenoid valve small valve hole sealant 8 is cured at the lower end of the solenoid valve core 7. The solenoid valve sliding sleeve 9 is fitted onto the solenoid valve core 7. The solenoid valve sliding sleeve 9 is provided with an upper flange 9-1, a lower flange 9-2, a lower end stop 9-3, and a sliding sleeve radial hole 9-4 connecting the inner and outer air chambers of the sliding sleeve 9. The upper flange 9-1 of the solenoid valve sleeve 9 is engaged above the shoulder 7-1 of the solenoid valve core 7. A gap δ1, constituting the first stage of the solenoid valve's opening stroke, is provided between the bottom surface of the upper flange 9-1 and the top surface of the shoulder 7-1. The small valve seat 10 is installed in the lower end stop 9-3 of the solenoid valve sleeve 9. The lower flange 9-2 of the solenoid valve sleeve 9 rivets the small valve seat 10 onto the solenoid valve sleeve 9. The small valve seat 10 has a small valve hole Φ1. The lower end recess of the small valve seat 10 contains a large valve hole sealant 11. The lower flange of the small valve seat 10 rivets the large valve hole sealant 11 onto the small valve seat 10.The large valve seat 12 of the solenoid valve is provided with a large valve hole Φ2, a stop 12-1, an inner convex ring 12-2, a flow hole 12-3 connecting the inner and outer air chambers of the large valve seat 12, a radial hole 12-4 at the bottom of the large valve seat, an outlet hole 12-5, and an annular groove 12-6 in the middle of the large valve seat 12. The stop 12-1 of the large valve seat 12 is fitted onto the lower outer circle of the lower fixed iron 4 of the solenoid valve. The inner convex ring 12-2 on the large valve seat 12, formed by external riveting, is locked in the lower annular groove 4-3 of the lower fixed iron 4, thus fixing the large valve seat 12 and the lower fixed iron 4 into one piece. The solenoid valve mounting base 13 is provided with an inlet connector mounting hole 13-1, a solenoid valve fixing screw hole 13-2, an outlet connector mounting hole 13-3, a lower mounting hole 13-4, an upper mounting hole 13-5, and a fixing mounting... The solenoid valve is installed in the upper mounting hole 13-5 and lower mounting hole 13-4 of the solenoid valve mounting seat 13. A high-low pressure chamber isolation sealing ring 15 is provided in the annular groove 12-6 in the middle of the large valve seat 12 to isolate and seal the high and low pressure chambers between the inlet and outlet. The outlet connector 14 is installed in the outlet connector mounting hole 13-3 on the solenoid valve mounting seat 13, and the inlet connector 17 is installed in the inlet connector mounting hole 13-1 on the solenoid valve mounting seat 13. The solenoid valve fixing screw 16 is installed in the solenoid valve fixing screw hole 13-2 on the solenoid valve mounting seat 13. The head of the solenoid valve fixing screw 16 extends into the lower radial hole 12-4 of the large valve seat 12, fixing the solenoid valve in the solenoid valve mounting hole of the solenoid valve mounting seat 13, thus eliminating the need for a fixing bracket on the solenoid valve housing 1 to fix the solenoid valve.

[0041] Air enters the solenoid valve mounting seat 13 through the inlet connector 17, then through the flow hole 12-3 on the large valve seat 12 into the inner cavity of the large valve seat 12, and then through the lower countersunk hole 4-4 of the lower stop 4 of the solenoid valve, through the radial hole 9-4 on the sliding sleeve 9 of the solenoid valve, into the air cavity around the small valve hole Φ1. The outlet hole 12-5 communicates with the outlet connector 14. When the solenoid valve is not energized, the sealing force acting on the sealant 11 of the large valve hole is the force exerted by the pressure difference above and below the sealant on the cross section of the large valve hole Φ2 plus the spring force. The sealing force acting on the sealant 8 of the small valve hole is the force exerted by the pressure difference above and below the sealant on the cross section of the small valve hole Φ1 plus the spring force. The cross section of the small valve hole Φ1 is much smaller than that of the large valve hole Φ1. 2. When the solenoid valve is energized, the electromagnetic driving force acting on the solenoid valve moving iron 6 when there is an initial gap δ between the solenoid valve moving iron 6 and the solenoid valve upper fixed iron 3 is less than the sealing force acting on the solenoid valve large valve orifice sealant 11 but greater than the sealing force acting on the solenoid valve small valve orifice sealant 8. The electromagnetic driving force causes the solenoid valve moving iron 6 to move upward. The solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve orifice sealant 8 to move upward until the top surface of the solenoid valve core 7 shoulder 7-1 abuts against the bottom surface of the solenoid valve sliding sleeve 9 upper flange 9-1. The solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve orifice sealant 8 to move upward by the first opening stroke δ1, thus opening the inlet end face of the small valve orifice Φ1 by a width. The opening δ1 is formed by the air inlet of the inlet connector 17, the solenoid valve mounting hole 13-5 on the solenoid valve mounting seat 13, the flow hole 12-3 on the solenoid valve large valve seat 12 connecting the inner and outer air chambers of the solenoid valve large valve seat 12, the inner cavity of the solenoid valve large valve seat 12, the lower end countersunk hole 4-4 of the solenoid valve lower fixed iron 4, the sliding sleeve radial hole 9-4 on the solenoid valve sliding sleeve 9 connecting the inner and outer air chambers of the sliding sleeve 9, and the air passage from the air chamber around the small valve hole Φ1 to the small valve hole Φ1. The high-pressure air in the air chamber around the small valve hole Φ1 flows from the small valve hole Φ1 into the outlet hole 12-5 of the solenoid valve large valve seat 12, thereby reducing the pressure difference between the inlet and outlet sides of the solenoid valve large valve hole sealant 11. The pressure difference between the inlet and outlet sides of the sealant 11 affects the force-bearing area of ​​the sealant 11 in the large valve orifice of the solenoid valve. This is reduced by the opening of the small valve orifice Φ1, further decreasing the sealing force on the sealant 11 in the large valve orifice. Furthermore, according to known theory, the driving electromagnetic force of the solenoid valve is approximately proportional to the reciprocal of the square of the stroke of the moving iron. Assuming that the first opening stroke δ1 of the moving iron 6 is half of the total stroke δ, and the second opening stroke "δ-δ1" is also half of the total stroke δ, then the driving electromagnetic force of the moving iron 6 at the beginning of the second opening stroke is approximately four times the reciprocal of the square of the total stroke δ.After the moving iron 6 of the solenoid valve engages during the first opening stroke δ1, which is the beginning of the second opening stroke, the electromagnetic driving force it experiences increases significantly. This causes the moving iron 6 to move the valve core 7 and the small valve orifice sealant 8 of the solenoid valve by the first opening stroke δ1. This reduces the pressure difference between the inlet and outlet sides of the large valve orifice sealant 11, decreases the area of ​​the sealant 11 subjected to this pressure difference, and significantly increases the driving electromagnetic force on the moving iron 6 at the beginning of the second opening stroke. The combined effect results in the driving force acting on the moving iron 6 of the solenoid valve being greater than the sealing force acting on the sealing adhesive 11 of the large valve orifice of the solenoid valve. This causes the moving iron 6 to move the solenoid valve core 7, the sealing adhesive 8 of the small valve orifice of the solenoid valve, the sliding sleeve 9, the small valve seat 10, and the sealing adhesive 11 of the large valve orifice of the solenoid valve upwards until the top surface of the moving iron 6 abuts against the bottom surface of the fixed iron 3 of the solenoid valve. The moving iron 6 then moves the solenoid valve core 7, the sealing adhesive 8 of the small valve orifice of the solenoid valve, the sliding sleeve 9, and the small valve seat 10 of the solenoid valve upwards. The valve seat 10 and the solenoid valve's large valve orifice sealant 11 move upwards for the second opening stroke "δ-δ1", opening an opening with a width equal to the second opening stroke "δ-δ1" at the inlet end face of the large valve orifice Φ2. The large diameter of the large valve orifice Φ2 allows for a large flow capacity even with this opening width, combined with the flow capacity of the small valve orifice Φ1. This results in a large flow rate when the pipeline control valve is fully open. After the solenoid valve is de-energized, its function... When the electromagnetic force on the moving iron 6 of the solenoid valve disappears, the pressure difference acting on the upper and lower sides of the large valve orifice sealant 11 and the small valve orifice sealant 8 of the solenoid valve, along with the spring force, causes the moving iron 6, the sliding sleeve 9, the small valve orifice sealant 8, the small valve seat 10, and the large valve orifice sealant 11 to return to their original positions, thus closing the pipeline control valve. This sets the working stroke of the solenoid valve into a double-stroke motion mechanism, enabling reliable operation of the pipeline control valve under high working pressure and large flow rate.

[0042] In one embodiment, such as Figure 1As shown, the pipeline control valve includes a solenoid valve housing 1, a solenoid valve coil 2, an upper solenoid valve base 3, a lower solenoid valve base 4, a solenoid valve spring 5, a moving solenoid valve base 6, a solenoid valve core 7, a small valve orifice sealant 8, a sliding sleeve 9, a small valve seat 10, a large valve orifice sealant 11, a large valve seat 12, a mounting base 13, an outlet connector 14, a high and low pressure chamber isolation sealing ring 15, a solenoid valve fixing screw 16, and an inlet connector 17. The solenoid valve coil 2 is installed inside the solenoid valve housing 1. The upper and lower parts of the solenoid valve coil 2 are respectively provided with the upper solenoid valve base 3 and the lower solenoid valve base 4, which are riveted together as a whole by the flange of the solenoid valve housing 1. The lower end of the solenoid valve coil 2 is provided with a convex ring 2-1. The lower fixed iron 4 of the solenoid valve is provided with an upper ring groove 4-1, a middle ring groove 4-2, a lower ring groove 4-3, a lower countersunk hole 4-4, and a axial through hole 4-5. The lower convex ring 2-1 of the solenoid valve coil 2 extends into the upper ring groove 4-1 of the lower fixed iron 4 of the solenoid valve, and a sealing ring is provided between the lower convex ring 2-1 of the solenoid valve coil 2 and the upper ring groove 4-1 of the lower fixed iron 4 of the solenoid valve for sealing. A sealing ring is also installed in the middle ring groove 4-2 of the lower fixed iron 4 of the solenoid valve for sealing. The moving iron 6 of the solenoid valve is installed in the axial through hole 4-5 of the lower fixed iron 4 of the solenoid valve. A solenoid valve spring 5 is installed between the upper fixed iron 3 of the solenoid valve and the moving iron 6 of the solenoid valve. The valve core 7 of the solenoid valve is tightly fitted and fixed to the solenoid valve. Inside the axial bore of the moving iron 6, the spring force of the solenoid valve spring 5 pushes the moving iron 6 away from the fixed iron 3 of the solenoid valve when the coil is not energized, thus forming a gap δ in the total stroke of the moving iron 6. A shoulder 7-1 is provided on the solenoid valve core 7, and a radial hole is provided on the solenoid valve core 7 that communicates with the axial bore of the solenoid valve core 7, thereby connecting the upper and lower areas of the moving iron 6 and reducing the movement resistance of the moving iron 6. A small valve orifice sealant 8 is cured at the lower end of the solenoid valve core 7. The solenoid valve sleeve 9 is fitted onto the solenoid valve core 7. The solenoid valve sleeve 9 is provided with an upper flange 9-1, a lower flange 9-2, a lower end stop 9-3, and a radial hole 9-4 connecting the inner and outer air chambers of the sleeve 9. The upper flange 9-1 of the solenoid valve sleeve 9 is secured above the shoulder 7-1 of the solenoid valve core 7. A gap δ1, constituting the first stage of the solenoid valve's opening stroke, is provided between the bottom surface of the upper flange 9-1 and the top surface of the shoulder 7-1. The small valve seat 10 is installed in the lower end stop 9-3 of the solenoid valve sleeve 9. The lower flange 9-2 of the solenoid valve sleeve 9 rivets the small valve seat 10 onto the solenoid valve sleeve 9. The small valve seat 10 has a small valve hole Φ1. A large valve hole sealant 11 is provided in the recess at the lower end of the small valve seat 10. The lower flange of the small valve seat 10 rivets the large valve hole sealant 11 onto the small valve seat 10.The large valve seat 12 of the solenoid valve is provided with a large valve hole Φ2, a stop 12-1, an inner convex ring 12-2, a flow hole 12-3 connecting the inner and outer air chambers of the large valve seat 12, a radial hole 12-4 at the bottom of the large valve seat, an outlet hole 12-5, and an annular groove 12-6 in the middle of the large valve seat 12. The stop 12-1 of the large valve seat 12 is fitted onto the lower outer circle of the lower fixed iron 4 of the solenoid valve. The inner convex ring 12-2 on the large valve seat 12, formed by external riveting, is locked in the lower annular groove 4-3 of the lower fixed iron 4, thus fixing the large valve seat 12 and the lower fixed iron 4 of the solenoid valve into one piece. The solenoid valve mounting base 13 is provided with an inlet connector mounting hole 13-1, a solenoid valve fixing screw hole 13-2, and an outlet connector mounting hole 13-6. -3. The solenoid valve has a lower mounting hole 13-4, an upper mounting hole 13-5, and a bolt hole 13-6 for fixing the mounting base. The solenoid valve is installed in the upper mounting hole 13-5 and the lower mounting hole 13-4 of the solenoid valve mounting base 13. A high and low pressure chamber isolation sealing ring 15 is provided in the annular groove 12-6 in the middle of the large valve seat 12 of the solenoid valve to isolate and seal the high and low pressure chambers between the inlet and outlet. The outlet connector 14 is installed in the outlet connector mounting hole 13-3 on the solenoid valve mounting base 13, and the inlet connector 17 is installed in the inlet connector mounting hole 13-1 on the solenoid valve mounting base 13. The solenoid valve fixing screw 16 is installed in the solenoid valve fixing screw hole 13-2 on the solenoid valve mounting base 13, and the head of the solenoid valve fixing screw 16 extends into the solenoid valve. The solenoid valve is fixed in the solenoid valve mounting hole of the solenoid valve mounting base 13 through the radial hole 12-4 below the large valve seat 12, thus eliminating the need for a fixing bracket on the solenoid valve housing 1 to fix the solenoid valve. Air enters the solenoid valve mounting base 13 through the inlet connector 17, passes through the flow hole 12-3 on the large valve seat 12 into the inner cavity of the large valve seat 12, and then enters the air cavity around the small valve hole Φ1 through the lower countersunk hole 4-4 of the lower stop 4 of the solenoid valve and the radial hole 9-4 on the sliding sleeve 9. The outlet hole 12-5 communicates with the outlet connector 14. When the solenoid valve is not energized, the sealing force acting on the sealing adhesive 11 of the large valve hole is the force exerted by the pressure difference above and below the sealing adhesive on the cross section of the large valve hole Φ2, plus the spring force. The sealing force on the small valve orifice sealant 8 of the solenoid valve is the force exerted by the pressure difference between the upper and lower parts of the valve orifice sealant on the cross section of the small valve orifice Φ1, plus the spring force. The cross section of the small valve orifice Φ1 is much smaller than the cross section of the large valve orifice Φ2. When the solenoid valve is energized, the electromagnetic driving force acting on the solenoid valve moving iron 6 when there is an initial gap δ between the solenoid valve moving iron 6 and the solenoid valve upper fixed iron 3 is less than the sealing force acting on the solenoid valve large valve orifice sealant 11, but greater than the sealing force acting on the solenoid valve small valve orifice sealant 8. The electromagnetic driving force causes the solenoid valve moving iron 6 to move upward. The solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve orifice sealant 8 to move upward until the top surface of the shoulder 7-1 of the solenoid valve core 7 abuts against the bottom surface of the flange 9-1 on the solenoid valve sliding sleeve 9.The moving iron 6 of the solenoid valve drives the valve core 7 and the sealing adhesive 8 of the small valve orifice of the solenoid valve to move upward by the first opening stroke δ1, thus opening an opening of width δ1 at the inlet end face of the small valve orifice Φ1. The air inlet channel of the small valve orifice Φ1 is formed by the air inlet hole of the inlet connector 17, the mounting hole 13-5 of the solenoid valve on the solenoid valve mounting seat 13, the flow hole 12-3 of the solenoid valve large valve seat 12 connecting the inner and outer air chambers of the solenoid valve large valve seat 12, the inner cavity of the solenoid valve large valve seat 12, the lower end countersunk hole 4-4 of the solenoid valve lower fixed iron 4, the sliding sleeve radial hole 9-4 of the solenoid valve sliding sleeve 9 connecting the inner and outer air chambers of the sliding sleeve 9, and the air passage from the air chamber above the small valve orifice Φ1 to the small valve orifice Φ1. The high-pressure air in the air chamber above the small valve orifice Φ1 flows into the small valve orifice Φ1. The pressure difference between the inlet and outlet sides of the solenoid valve's large valve seat 12 and the large valve orifice sealant 11 is reduced by the outlet hole 12-5. Furthermore, the pressure difference acting on the large valve orifice sealant 11 is reduced due to the opening of the small valve orifice Φ1, further reducing the sealing force on the large valve orifice sealant 11. Additionally, according to known theory, the driving electromagnetic force of the solenoid valve is approximately proportional to the reciprocal of the square of the stroke of the solenoid valve's moving iron. Assuming that the first opening stroke δ1 of the solenoid valve's moving iron 6 is half of the total stroke δ, and the second opening stroke "δ-δ1" of the solenoid valve's moving iron 6 is also half of the total stroke δ, then the solenoid valve's moving iron 6 begins its second opening stroke... The driving electromagnetic force at the beginning of the second opening stroke is approximately four times the initial driving electromagnetic force of the solenoid valve moving iron 6 during its total stroke δ. The electromagnetic driving force on the moving iron 6 increases significantly after the first opening stroke δ1, which is the beginning of the second opening stroke. This, combined with the reduction in pressure difference between the inlet and outlet sides of the large valve orifice sealant 11 and the decrease in the pressure area acting on the large valve orifice sealant 11, and the significant increase in the driving electromagnetic force on the moving iron 6 at the beginning of the second opening stroke, results in a driving force on the moving iron 6 being greater than that on the large valve orifice sealant 11. The sealing force causes the moving iron 6 of the solenoid valve to move upwards, driving the solenoid valve core 7, the small valve orifice sealant 8, the solenoid valve sleeve 9, the small valve seat 10, and the large valve orifice sealant 11 until the top surface of the moving iron 6 abuts against the bottom surface of the fixed iron 3. The moving iron 6 then drives the solenoid valve core 7, the small valve orifice sealant 8, the solenoid valve sleeve 9, the small valve seat 10, and the large valve orifice sealant 11 upwards for a second opening stroke "δ-δ1". This causes the inlet face of the large valve orifice Φ2 to open with a width equal to the second opening stroke "δ-δ1". The larger diameter of the large valve orifice Φ2 allows for a larger flow capacity by opening this second opening stroke "δ-δ1".In addition, the flow capacity of the small valve orifice Φ1 allows the pipeline control valve to have a large flow capacity when fully open. After the solenoid valve is de-energized, the electromagnetic force acting on the moving iron 6 of the solenoid valve disappears. The pressure difference force acting on the upper and lower sides of the large valve orifice sealant 11 and the small valve orifice sealant 8 of the solenoid valve, as well as the spring force, causes the moving iron 6, the sliding sleeve 9, the small valve orifice sealant 8, the small valve seat 10, and the large valve orifice sealant 11 of the solenoid valve to return to their seats and close the pipeline control valve. In this way, the working stroke of the solenoid valve is set as a double-stroke motion mechanism, realizing the reliable operation of the pipeline control valve with large flow under high working pressure.

[0043] In one embodiment, such as Figure 2 As shown, in the pipeline control valve with the small valve orifice open, when the solenoid valve is initially energized, the electromagnetic driving force acting on the solenoid valve moving iron 6 when there is an initial gap δ between the solenoid valve moving iron 6 and the solenoid valve upper fixed iron 3 is less than the sealing force acting on the solenoid valve large valve orifice sealant 11 but greater than the sealing force acting on the solenoid valve small valve orifice sealant 8. The electromagnetic driving force causes the solenoid valve moving iron 6 to move upward. The solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve orifice sealant 8 to move upward until the top surface of the solenoid valve core 7 shoulder 7-1 abuts against the bottom surface of the solenoid valve sliding sleeve 9 upper flange 9-1. The solenoid valve moving iron 6 drives the solenoid valve core 7 and the solenoid valve small valve orifice sealant 8 to move upward by the first opening stroke δ1, thus opening an opening of width δ1 at the inlet end face of the small valve orifice Φ1. The high-pressure gas in the air chamber above the small valve orifice Φ1 flows into the outlet hole 12-5 of the solenoid valve large valve seat 12, thereby reducing the electric current. The pressure difference between the inlet and outlet sides of the solenoid valve's large valve orifice sealant 11, and the force-bearing area of ​​the solenoid valve's large valve orifice sealant 11 acting on it due to the opening of the small valve orifice Φ1, further reduces the sealing force acting on the solenoid valve's large valve orifice sealant 11. In addition, according to known theory, the driving electromagnetic force of the solenoid valve is approximately proportional to the reciprocal of the square of the stroke of the solenoid valve's moving iron. Assuming that the first opening stroke δ1 of the solenoid valve's moving iron 6 is half of the total stroke δ, that is, the second opening stroke "δ-δ1" of the solenoid valve's moving iron 6 is also half of the total stroke δ, then the driving electromagnetic force of the solenoid valve's moving iron 6 at the beginning of the second opening stroke is approximately the reciprocal of the square of four times the initial driving electromagnetic force of the solenoid valve's moving iron 6 at the beginning of the total stroke δ. After the solenoid valve's moving iron 6 engages the first opening stroke δ1, that is, at the beginning of the second opening stroke, the electromagnetic driving force it receives increases significantly.

[0044] In one embodiment, such as Figure 3As shown, in the fully open pipeline control valve, after the solenoid valve moving iron 6 moves the solenoid valve core 7 and the solenoid valve small valve orifice sealant 8 by the first opening stroke δ1, the pressure difference between the inlet and outlet sides of the solenoid valve large valve orifice sealant 11 decreases, the force-bearing area of ​​the pressure difference on the solenoid valve large valve orifice sealant 11 decreases, and the driving electromagnetic force on the solenoid valve moving iron 6 at the beginning of the second opening stroke is significantly increased. As a result, the driving force acting on the solenoid valve moving iron 6 is greater than the sealing force acting on the solenoid valve large valve orifice sealant 11. This causes the solenoid valve moving iron 6 to move the solenoid valve core 7, the solenoid valve small valve orifice sealant 8, the solenoid valve sliding sleeve 9, the solenoid valve small valve seat 10, and the solenoid valve large valve orifice sealant 11 upwards until the top surface of the solenoid valve moving iron 6 abuts against the solenoid valve. Up to the bottom surface of the fixed iron 3 on the valve, the moving iron 6 of the solenoid valve drives the valve core 7, the small valve hole sealant 8, the sliding sleeve 9, the small valve seat 10, and the large valve hole sealant 11 of the solenoid valve to move upwards by the second opening stroke "δ-δ1", thus opening an opening with a width of the second opening stroke "δ-δ1" at the inlet end face of the large valve hole Φ2. The large diameter of the large valve hole Φ2 allows for a large flow capacity by opening an opening with a width of the second opening stroke "δ-δ1" at the inlet end face of the large valve hole. Combined with the flow capacity of the small valve hole Φ1, this enables the pipeline control valve to have a large flow capacity when fully open. In this way, the working stroke of the solenoid valve is set as a double-stroke motion mechanism, realizing the reliable operation of the pipeline control valve with large flow under high working pressure.

[0045] In one embodiment, the pipeline control valve includes a solenoid valve housing 1, a solenoid valve coil 2, a solenoid valve upper fixed iron 3, a solenoid valve lower fixed iron 4, a solenoid valve spring 5, a solenoid valve moving iron 6, a solenoid valve core 7, a solenoid valve small valve hole sealant 8, a solenoid valve sliding sleeve 9, a solenoid valve small valve seat 10, a solenoid valve large valve hole sealant 11, a solenoid valve large valve seat 12, a solenoid valve mounting base 13, an outlet connector 14, a high and low pressure chamber isolation sealing ring 15, a solenoid valve fixing screw 16, and an inlet connector 17. The solenoid valve core 7 is tightly fitted and fixed in the axial hole of the solenoid valve moving iron 6. The solenoid valve sliding sleeve 9 is sleeved on the solenoid valve core 7. The solenoid valve small valve seat 10 is installed in the lower end stop 9-3 of the solenoid valve sliding sleeve 9. The lower flange 9-2 of the solenoid valve sliding sleeve 9 rivets the solenoid valve small valve seat 10 onto the solenoid valve sliding sleeve 9. The solenoid valve is installed in the mounting hole of the solenoid valve mounting base 13. The solenoid valve fixing screw 16 is installed in the solenoid valve fixing screw hole 13-2 on the solenoid valve mounting base 13. The head of the solenoid valve fixing screw 16 extends into the lower radial hole 12-4 of the solenoid valve large seat 12 to fix the solenoid valve in the solenoid valve mounting hole of the solenoid valve mounting base 13.

[0046] In one embodiment, a raised ring 2-1 is provided at the lower end of the solenoid valve coil 2, and an upper ring groove 4-1 is provided on the lower stationary iron of the solenoid valve 4. The raised ring 2-1 at the lower end of the solenoid valve coil 2 extends into the upper ring groove 4-1 of the lower stationary iron of the solenoid valve 4, and a sealing ring is provided between the raised ring 2-1 at the lower end of the solenoid valve coil 2 and the upper ring groove 4-1 of the lower stationary iron of the solenoid valve 4.

[0047] In one embodiment, such as Figure 4 As shown, the solenoid valve mounting base 13 is provided with an inlet connector mounting hole 13-1, a solenoid valve fixing screw hole 13-2, an outlet connector mounting hole 13-3, a lower solenoid valve mounting hole 13-4, an upper solenoid valve mounting hole 13-5, and a bolt hole 13-6 for fixing the mounting base.

[0048] In one embodiment, such as Figure 5 As shown, in the structure of the lower stationary iron of the solenoid valve, the lower stationary iron 4 of the solenoid valve is provided with an upper annular groove 4-1, a middle annular groove 4-2, a lower annular groove 4-3, a lower end countersunk hole 4-4, and a axial through hole 4-5.

[0049] In one embodiment, such as Figure 6As shown, in the structure of the large valve seat of the solenoid valve, the large valve seat 12 of the solenoid valve is provided with a stop 12-1, an inner convex ring 12-2, a flow hole 12-3 connecting the inner and outer air chambers of the large valve seat 12 of the solenoid valve, a radial hole 12-4 below the large valve seat of the solenoid valve, an outlet hole 12-5, and an annular groove 12-6 in the middle of the large valve seat 12 of the solenoid valve.

[0050] In one embodiment, such as Figure 7 As shown, in the structure of the solenoid valve slide sleeve, the solenoid valve slide sleeve 9 is provided with an upper flange 9-1, a lower flange 9-2, a lower end stop 9-3, and a slide sleeve radial hole 9-4 that connects the inner and outer air chambers of the slide sleeve 9.

[0051] Although embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments and application fields described above. The specific embodiments described above are merely illustrative and instructive, and not restrictive. Those skilled in the art can make many other forms based on the guidance of this specification and without departing from the scope of protection of the claims of the present invention, and all of these are within the scope of protection of the present invention.

Claims

1. A pipeline control valve, characterized in that, It includes, The solenoid valve coil has a convex ring at its lower end. The lower stationary iron of the solenoid valve is located below the solenoid valve coil. The lower stationary iron of the solenoid valve includes a central through hole, a lower countersunk hole located at the bottom end of the central through hole, and an upper annular groove and a lower annular groove surrounding the central through hole. The convex ring extends into the upper annular groove and is sealed by a sealing ring. The upper stationary iron of the solenoid valve is located above the solenoid valve coil. The solenoid valve coil, the upper stationary iron of the solenoid valve, and the lower stationary iron of the solenoid valve constitute an integral structure. The solenoid valve moving iron is installed in the axial through hole, and the solenoid valve moving iron has the axial hole. The solenoid valve core is tightly fitted and fixed in the axial bore, and the solenoid valve core includes a shoulder that protrudes outward perpendicular to the axial direction. The solenoid valve spring is installed between the upper fixed iron and the moving iron of the solenoid valve. One end of the solenoid valve spring is connected to the solenoid valve core, and the other end is connected to the upper fixed iron of the solenoid valve. When the solenoid valve coil is not energized, the elastic force of the solenoid valve spring pushes the moving iron of the solenoid valve away from the upper fixed iron of the solenoid valve, thus forming the initial gap δ of the total stroke of the moving iron of the solenoid valve. The lower end of the solenoid valve core is sealed with solenoid valve small valve hole sealant. The solenoid valve sleeve is fitted onto the solenoid valve core. The solenoid valve sleeve includes an upper flange, a lower flange, a lower end stop, and a radial hole for connecting the inner and outer air chambers of the sleeve. The upper flange is engaged above the shoulder, and a gap δ1 is provided between the bottom surface of the upper flange and the top surface of the shoulder to form the first opening stroke of the solenoid valve. The small valve seat of the solenoid valve is installed in the lower end stop and the lower flange is riveted to the solenoid valve slide sleeve. The small valve seat of the solenoid valve includes a small valve hole Φ1 with a first diameter in the axial direction and a recess at the lower end. The recess is provided with the solenoid valve large valve hole sealant. The lower flange of the small valve seat of the solenoid valve rivets the solenoid valve large valve hole sealant to the small valve seat of the solenoid valve. The large valve seat of the solenoid valve includes an axial large valve hole Φ2 with a second diameter, an inner convex ring and a stop distributed along the inner wall of the large valve hole Φ2, a flow hole connecting the inner and outer air chambers of the large valve seat of the solenoid valve, a radial hole below the large valve seat of the solenoid valve and an outlet hole. The stop is sleeved on the lower outer circle of the lower fixed iron of the solenoid valve, and the inner convex ring is engaged in the lower ring groove so that the large valve seat of the solenoid valve and the lower fixed iron of the solenoid valve are fixed together to form a solenoid valve structure. The second diameter is larger than the first diameter. The solenoid valve mounting base includes an inlet connector mounting hole for mounting an inlet connector, a solenoid valve fixing screw hole, an outlet connector mounting hole for mounting an outlet connector, a lower solenoid valve mounting hole for mounting the solenoid valve structure, and an upper solenoid valve mounting hole. The solenoid valve fixing screw connects to the solenoid valve fixing screw hole and extends into a radial hole below the large valve seat of the solenoid valve. Air enters the solenoid valve mounting base from the inlet connector, passes through the flow hole into the inner cavity of the large valve seat of the solenoid valve, and then enters the air cavity around the small valve hole Φ1 through the radial hole of the sliding sleeve from the lower countersunk hole. The outlet hole is connected to the outlet connector.

2. The pipeline control valve according to claim 1, characterized in that, When the solenoid valve coil is not energized, the sealing force acting on the sealant of the large valve orifice of the solenoid valve is the force exerted by the pressure difference between the upper and lower parts of the large valve orifice on the Φ2 section plus the spring force of the solenoid valve spring. The sealing force acting on the sealant of the small valve orifice of the solenoid valve is the force exerted by the pressure difference between the upper and lower parts of the small valve orifice on the Φ1 section plus the spring force of the solenoid valve spring. The Φ1 section of the small valve orifice is smaller than the Φ2 section of the large valve orifice.

3. The pipeline control valve according to claim 1, characterized in that, When the solenoid valve coil is energized, and there is an initial gap δ between the moving iron and the upper stationary iron of the solenoid valve, the electromagnetic driving force acting on the moving iron is less than the sealing force acting on the sealant of the large valve orifice but greater than the sealing force acting on the sealant of the small valve orifice. This electromagnetic driving force causes the moving iron to move upwards. The moving iron then moves the valve core and the sealant of the small valve orifice upwards until the top surface of the shoulder abuts against the bottom surface of the upper flange. The moving iron then moves the valve core and the sealant of the small valve orifice upwards by the first segment of the opening stroke gap δ1, thus opening the inlet face of the small valve orifice Φ1. An opening with a width equal to the gap δ1 is formed by the air inlet of the inlet connector, the mounting hole on the solenoid valve, the flow passage, the inner cavity of the large valve seat of the solenoid valve, the lower countersunk hole, the radial hole of the sliding sleeve, and the air passage from the air cavity around the small valve hole Φ1 to the small valve hole Φ1. The high-pressure air in the air cavity around the small valve hole Φ1 flows into the outlet hole from the small valve hole Φ1, thereby reducing the pressure difference between the inlet and outlet sides of the sealant of the large valve hole of the solenoid valve. Furthermore, the area of ​​the pressure difference between the inlet and outlet sides of the sealant of the large valve hole of the solenoid valve acting on the sealant of the large valve hole of the solenoid valve is reduced due to the opening of the small valve hole Φ1.

4. The pipeline control valve according to claim 1, characterized in that, After the moving iron of the solenoid valve engages the gap δ1 of the first stage of the opening stroke, the electromagnetic driving force it receives at the beginning of the second stage of the opening stroke increases. This causes the moving iron to move the valve core and the sealant in the small valve orifice of the solenoid valve, reducing the pressure difference between the inlet and outlet sides of the sealant in the large valve orifice. Furthermore, the pressure difference acting on the sealant in the large valve orifice decreases, and the driving electromagnetic force on the moving iron at the beginning of the second stage of the opening stroke increases. This results in the driving force acting on the moving iron being greater than the force acting on the sealant in the large valve orifice. The sealing force on the valve hole sealant causes the moving iron of the solenoid valve to move upward, along with the solenoid valve core, the solenoid valve small valve hole sealant, the solenoid valve sliding sleeve, the solenoid valve small valve seat, and the solenoid valve large valve hole sealant, until the top surface of the moving iron abuts against the bottom surface of the fixed iron of the solenoid valve. The moving iron of the solenoid valve then moves the solenoid valve core, the solenoid valve small valve hole sealant, the solenoid valve sliding sleeve, the solenoid valve small valve seat, and the solenoid valve large valve hole sealant upward by the gap δ1 of the second opening stroke, thus opening the inlet end face of the large valve hole Φ2 with an opening width equal to the gap δ1 of the second opening stroke.

5. The pipeline control valve according to claim 1, characterized in that, When the solenoid valve coil is de-energized, the electromagnetic force acting on the solenoid valve moving iron disappears. The pressure difference force acting on the upper and lower sides of the solenoid valve large valve hole sealant and the solenoid valve small valve hole sealant, as well as the spring force, cause the solenoid valve moving iron, solenoid valve sliding sleeve, solenoid valve small valve hole sealant, solenoid valve small valve seat, and solenoid valve large valve hole sealant to return to their original positions, thereby closing the pipeline control valve.

6. The pipeline control valve according to claim 1, characterized in that, The solenoid valve core also includes a hollow axial bore and a radial bore that passes through the hollow axial bore.

7. The pipeline control valve according to claim 1, characterized in that, The solenoid valve mounting base also includes bolt holes for fixing it.

8. The pipeline control valve according to claim 1, characterized in that, The large valve seat of the solenoid valve also includes a central annular groove, and a high-low pressure cavity isolation sealing ring is provided in the central annular groove to isolate and seal the high and low pressure cavities between the inlet and outlet.

9. The pipeline control valve according to claim 1, characterized in that, The overall structure also includes a solenoid valve housing, with the solenoid valve coil installed inside the solenoid valve housing. The upper and lower parts of the solenoid valve coil are respectively provided with an upper solenoid valve stator and a lower solenoid valve stator, which are riveted together with the flange of the solenoid valve housing to form an overall structure.

10. The pipeline control valve according to claim 1, characterized in that, A middle annular groove is also provided between the upper and lower annular grooves, and a sealing ring is installed in the middle annular groove for sealing.

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