Digital electromagnetic valve terminal and control method therefor

Abstract

Disclosed in the present invention are a digital electromagnetic valve terminal and a control method therefor. The electromagnetic valve terminal comprises a valve terminal body having a plurality of accommodating cavities, at least two unit valves, an electromagnetic unit and a control unit. The unit valves are provided in the accommodating cavities and are used for allowing or blocking passage of a fluid. The electromagnetic unit is coupled to the unit valves and is used for driving the unit valves to act. The control unit controls the electromagnetic unit to act and provides a power source, so that the opening ratio of the unit valves can be accurately controlled. The electromagnetic unit comprises a coil assembly, an armature and an elastic member, wherein the armature increases the magnetic flux so as to enhance the magnetic force, thus allowing valve cores to respond stably and quickly. The valve terminal body is provided with an adjusting member used for fixing and adjusting the position of the coil assembly. The top of a cover is provided with a wire pressing plate for fixing leads of the coil assembly and a power supply wire and a signal wire of the control unit. The control method achieves accurate control of the output of the electromagnetic valve terminal by means of control of the start and stop of the coil assembly and a preset control scheme. The present invention has the advantages of compact structure, accurate flow control, high response speed, high stability, etc.

Description

A digital solenoid valve island and its control method Technical Field

[0001] This invention relates to the field of valve technology, and more specifically to a digital solenoid valve island and its control method. Background Technology

[0002] Currently, high-speed on / off digital valves operate in a fully open or fully closed state, resulting in low pressure loss, low energy consumption, and insensitivity to oil contamination. Compared to traditional servo proportional valves, high-speed on / off valves can directly convert ON / OFF digital signals into flow signals, allowing the digital signals to be directly integrated with the hydraulic system. However, a single high-speed on / off digital valve has limitations in terms of flow rate and the control of a single flow velocity, which restricts its direct application in braking devices such as excavators, cranes, and shock absorber damping control.

[0003] Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the aforementioned issues, this invention proposes a digital solenoid valve island and its control method, aiming to solve the problems of small flow rate, single controlled flow velocity, and certain limitations in direct application to braking devices such as excavators, cranes, and shock absorber damping control in existing technologies.

[0006] (II) Technical Solution

[0007] The present invention provides a digital solenoid valve island, the solenoid valve island comprising:

[0008] A valve island body having multiple cavities, each cavity having an opening at one end, and the valve island body having channels for fluid to pass through;

[0009] At least two unit valves are respectively disposed in the cavity, for cooperating with the solenoid valve body to conduct or cut off the fluid passing through the solenoid valve island;

[0010] An electromagnetic unit is disposed within the cavity and is used to drive the unit valve to perform actions to achieve conduction or cut-off. The electromagnetic unit is coupled to the unit valve, and the number of electromagnetic units corresponds to the number of unit valves.

[0011] A control unit, located on the valve island body, is used to control the operation of the electromagnetic unit and provide a power source;

[0012] The control unit can drive the electromagnetic unit to control the conduction ratio of the unit valve.

[0013] In this invention, the unit valve includes a valve core and a valve sleeve with a discharge port. The valve sleeve is fixed in the cavity, while the valve core is movably disposed in the valve sleeve and can move up and down in the valve sleeve.

[0014] The electromagnetic unit is also located within the cavity. The electromagnetic unit includes a coil assembly, which is connected to the control unit. The valve island body is also provided with an adjusting member for fixing and adjusting the position of the coil assembly.

[0015] The valve core can be attracted by the coil assembly after being energized, and the conduction ratio of the corresponding unit valve can be controlled by controlling the magnetic force of different coil assemblies.

[0016] In this invention, the electromagnetic unit further includes an armature for increasing the magnetic flux of the coil assembly when it is working, thereby increasing the magnetic force. The armature is disposed between the coil assembly and the valve core, and the armature is fixedly connected to the valve core.

[0017] The coil assembly has a groove, and an elastic element is provided in the groove. One end of the elastic element abuts against the armature.

[0018] In this invention, the coil assembly includes at least one mounting base with a cavity and at least one electromagnetic coil, one end of the cavity having an opening, and the electromagnetic coil being fixedly disposed within the cavity;

[0019] The cavity is filled with a sealing and insulating compound after the electromagnetic coil is installed inside it, which is used to fix the electromagnetic coil and insulate and seal it.

[0020] In this invention, the adjusting component is a threaded fastener, and the valve island body is provided with a threaded groove communicating with the cavity. The threaded fastener passes through the threaded groove and cooperates with the coil assembly. Rotating the threaded fastener can control the tightness of the coil assembly.

[0021] In this invention, the lower part of the outer side of the valve core is provided with a sharp edge, and the lower part of the valve sleeve is provided with a chamfer that cooperates with the sharp edge to cut off the fluid. When the sharp edge abuts against the chamfer, the unit valve is closed.

[0022] The valve sleeve has a flow guide hole on its side, and the valve core has an annular groove on the same horizontal plane as the flow guide hole. A storage cavity is formed between the annular groove and the valve sleeve for temporarily storing the fluid passing through the solenoid valve body.

[0023] In this invention, the valve core is further provided with uniformly distributed pressure equalization grooves to prevent the valve core from jamming under high pressure, and the pressure equalization grooves are disposed above the annular groove.

[0024] In this invention, the valve island body is further provided with a cover for protecting the control unit, and the cover and the valve island body are fitted together to form a cavity for accommodating the control unit.

[0025] After the control unit is placed inside the cavity, epoxy resin is poured into the cavity to insulate and seal the control unit.

[0026] In this invention, the top of the cover is also provided with a pressure plate, the lead wire of the coil assembly is connected to the control unit, and the power line and signal line on the control unit pass through the cover and are pressed and fixed by the pressure plate.

[0027] Another digital solenoid valve island control method of the present invention, wherein the control method is implemented based on the digital solenoid valve island described in the above technical solution, and the control method includes:

[0028] The start and stop of the coil assembly are controlled to control the opening or closing of different unit valves, thereby controlling the overall flow ratio of the valve island;

[0029] The coil assembly can control the output of the solenoid valve island at different stages according to a preset control scheme.

[0030] (III) Beneficial Effects

[0031] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0032] (1) In this invention, the multiple cavity design on the valve island body allows for the flexible installation of at least two unit valves, each equipped with a corresponding electromagnetic unit, thus achieving a high degree of integration and modularity of the electromagnetic valve island. This design not only simplifies the structure of the fluid control system but also improves the system's reliability and maintainability.

[0033] (2) In this invention, the control unit can drive the electromagnetic unit to precisely control the conduction ratio of the control valve, thereby achieving fine regulation of the fluid flow rate through the electromagnetic valve island. This precise flow control capability is particularly important for industrial applications that require high-precision flow control.

[0034] (3) The armature set in the electromagnetic unit in this invention effectively increases the magnetic flux of the coil assembly when it is working, thereby increasing the magnetic force, so that the valve core can respond to the control signal more stably and quickly, and improve the response speed and stability of the electromagnetic valve island. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 is a schematic diagram of the cross-sectional structure of the valve island;

[0037] Figure 2 is a schematic diagram of the exploded structure of the unit valve and the electromagnetic unit;

[0038] Figure 3 is a schematic diagram of the connection structure of the unit valve;

[0039] Figure 4 is a schematic diagram of the coil assembly;

[0040] Figure 5 is a schematic cross-sectional view of the electromagnetic unit.

[0041] Figure 6 is a logical diagram of the valve island's driving method;

[0042] Figure 7 is a schematic diagram of the 16 damping force graphs of the present invention applied to the vibration damper;

[0043] Figure 8 is a schematic diagram of the input signal duty cycle and valve combination on / off states of the present invention.

[0044] 1. Valve island body; 11. Cavity; 111. First cavity; 112. Second cavity; 12. Channel; 13. Threaded groove;

[0045] 2. Unit valve, 21. Valve core, 211. Sharp edge, 212. Annular groove, 213. Pressure equalizing groove, 22. Valve sleeve, 221. Chamfer, 222. Guide hole, 223. Discharge port, 23. First valve passage, 24. Second valve passage;

[0046] 3. Electromagnetic unit; 31. Coil assembly; 311. Mounting base; 312. Electromagnetic coil; 313. Cavity; 314. Groove; 32. Armature; 34. Elastic element;

[0047] 4. Control unit; 41. Component carrier; 42. Switching device; 43. Driver chip; 44. Power supply device; 45. Main control chip.

[0048] 5. Adjusting components;

[0049] 6. Cover. Detailed Implementation

[0050] Example 1

[0051] As shown in Figure 1, the digital solenoid valve island of the present invention mainly includes key components such as valve island body 1, unit valve 2, electromagnetic unit 3, control unit 4, and adjusting component 5.

[0052] The valve island body 1 is made of high-strength, corrosion-resistant material and has multiple internal cavities 11. Each cavity has an opening at one end to facilitate the installation of the unit valve 2 and the solenoid unit 3. The cavities 11 include a first cavity 111 and a second cavity 112. Referring to Figure 1, the first cavity 111 is located in the upper part of the valve island body with its opening facing upwards, and is used to house the solenoid unit 3. The second cavity 112 is located in the lower part of the valve island body with its opening facing downwards, and is used to house the unit valve 2. Specifically, the first cavity 111 and the second cavity 112 are interconnected to allow the solenoid unit 3 to better drive and control the operation of the unit valve 2.

[0053] As shown in Figures 1 and 2, the valve island body 1 is also provided with a channel 12 for fluid to pass through, ensuring that the fluid can smoothly enter and exit the unit valve 2 and then flow out from the unit valve 2. The valve island body 1 serves as the supporting structure of the entire system, and is internally designed with a first valve channel 23, which serves as the inlet and outlet for the fluid or gas medium. At least two unit valves 2 are configured within the valve island body 1, and each unit valve 2 is provided with a second valve channel 24. This second valve channel 24 is connected to the first valve channel 23, together forming the main path for the fluid or gas to pass through, with the flow direction shown by the arrow in Figure 1. The unit valves are designed using a modular approach, allowing for flexible addition or reduction of the number according to actual needs, improving the system's scalability and adaptability. Specifically, in this embodiment, the first valve channel 23 serves as the inlet, and multiple second valve channels 24 serve as outlets; however, depending on actual needs, multiple second valve channels 24 can also be used as inlets, while the first valve channel 23 serves as an outlet.

[0054] Specifically, as shown in Figures 2 and 3, the unit valve 2 is the core component for controlling the flow of fluid. Each second cavity 112 contains one unit valve 2. In this embodiment, there are four second cavities 112 and four unit valves 2. The outer wall of the unit valve 2 is provided with an external thread, while the inner wall of the second cavity 112 is provided with an internal thread that mates with the external connecting thread. That is, the unit valve 2 is installed in the second cavity 112 through a threaded connection.

[0055] The unit valve 2 includes a valve core 21 and a valve sleeve 22 with a discharge port 223. The valve sleeve 22 is fixed within the cavity 11, while the valve core 21 is movably disposed within the valve sleeve 22, capable of moving up and down to control the flow of fluid. The discharge port 223 is located at the bottom of the valve sleeve. The lower part of the valve core 21 has a sharp edge 211, and the lower part of the valve sleeve 22 has a chamfer 221 that cooperates with the sharp edge 211 to cut off the fluid. When the sharp edge 211 abuts against the chamfer 221, the unit valve is closed; otherwise, the unit valve is open.

[0056] The valve sleeve 22 has a flow guide hole 222 on its side, and the valve core 21 has an annular groove 212 on the same horizontal plane as the flow guide hole 222. A storage cavity is formed between the annular groove 212 and the valve sleeve 22 to temporarily store the fluid passing through the solenoid valve body. This design helps to reduce fluid impact and improve the stability of fluid control. In addition, the valve core 21 also has uniformly distributed pressure equalization grooves 213 to prevent the valve core from jamming under high pressure. The pressure equalization grooves 213 are located above the annular groove 212, which can effectively disperse fluid pressure and extend the service life of the valve core.

[0057] The electromagnetic unit 3 is used to drive the valve core 21 of the unit valve 2 to actuate, and its number corresponds to the number of unit valves 2. The electromagnetic unit includes a coil assembly 31, an armature 32, and a coil assembly 31. The coil assembly 31 is connected to the control unit 4, and the magnitude of its magnetic force is changed by controlling the magnitude of the current flowing through the coil assembly 31, thereby driving the valve core 21 to actuate.

[0058] The coil assembly 31 includes a mounting base 311 and at least one electromagnetic coil 312. The mounting base 311 has a cavity 313 for mounting the electromagnetic coil 312, and one end of the cavity also has an opening. After the electromagnetic coil 312 is installed, it is insulated and sealed with epoxy resin, which also fixes the position of the electromagnetic coil 312. To enhance the magnetic force of the electromagnetic coil 312, the electromagnetic unit 3 also includes an armature 32, which is disposed in the first cavity 111 and located between the coil assembly 31 and the valve core 21. The valve core 21 is fixedly connected by bolts.

[0059] To better compress the valve core, the coil assembly 31 is provided with a groove 314, and an elastic element 34 is provided in the groove 314. One end of the elastic element 34 abuts against the armature 32, and the other end is set in the groove to compress the valve core and reset it.

[0060] Referring to Figures 1 and 4, the control unit 4 is mounted on the valve island body 1 and is used to control the operation of the electromagnetic unit 3 and provide a power source. It can precisely control the energization state of each coil assembly 31 according to external signals or preset programs, thereby achieving precise control of the conduction ratio of the unit valve 2.

[0061] The control unit 4 is the brain of the entire valve island, integrating key components such as the component carrier 41, switching elements 42, drive chip 43, power supply unit 44, and main control chip 45. In this embodiment, the component carrier 41 is a circuit board. The switching elements 42 employ semiconductor devices such as MOSFETs or silicon controlled rectifiers (SCRs). These switching elements 42 are connected to both ends of the coil, and by controlling their on / off states, the current in the coil is adjusted, thereby controlling the generation and disappearance of the magnetic field and achieving rapid on / off control of the unit valve 2. It is worth noting that, to improve control reliability and response speed, the coil assembly 31 of this invention is jointly controlled by the switching elements 42 connected to both ends of the electromagnetic coil 312, forming a redundant design to ensure stable operation even under extreme conditions.

[0062] The main control chip 45 in the control unit 4 is responsible for receiving external commands and calculating the corresponding control signals according to the preset logic algorithm. These signals are amplified by the driver chip and directly act on the switching element 42 to achieve precise control of the current of the electromagnetic coil 312. At the same time, the power supply element 44 provides a stable operating voltage for the entire control unit 4 and the electromagnetic unit 3 to ensure the continuous and stable operation of the system.

[0063] Through the above design, the high-speed switching valve island of this invention can achieve rapid switching and precise control of fluid paths. It features fast response and high control accuracy, making it ideal for industrial automation applications that require frequent changes in fluid direction or flow rate. Furthermore, the modular design facilitates system maintenance and upgrades, reducing maintenance and time costs for users.

[0064] As shown in Figure 5, the adjusting member 5 is used to fix and adjust the position of the electromagnetic unit 3. In this embodiment, the adjusting member 5 is a threaded fastener, such as a bolt, screw, or stud. The valve island body 1 is provided with a threaded groove 13 that communicates with the first cavity 111. The threaded fastener passes through the threaded groove 13 and engages with the coil assembly 31. By rotating the threaded fastener, the tightness of the coil assembly 31 within the first cavity 111 can be controlled, thereby adjusting the position of the electromagnetic unit 3.

[0065] The valve island body 1 is also provided with a cover 6 for protecting the control unit 4. The cover 6 and the valve island body 1 are fitted together to form a cavity for accommodating the control unit 4. After the control unit 4 is placed in the cavity, epoxy resin is poured into the cavity to insulate and seal the control unit 4, preventing it from being interfered with and damaged by the external environment.

[0066] The top of the cover 6 is also equipped with a wire clamping plate, through which the lead wires of the coil assembly 31 are connected to the control unit 4. The power and signal wires on the control unit 4 pass through the cover 6 and are clamped and secured by the wire clamping plate. This design not only ensures the robustness and reliability of the wiring but also facilitates later maintenance and replacement.

[0067] When the control unit 4 receives an external signal or a preset program control command, it precisely controls the energizing state of each electromagnetic unit according to the command. The energized coil assembly 31 generates magnetic force, attracting the armature 32 and the valve core 21, causing the valve core 21 to move up and down to control the flow rate and proportion of the fluid. By adjusting the magnetic force of the electromagnetic units and the movement amplitude of the valve core 21, precise control of the fluid flow rate can be achieved.

[0068] Example 2

[0069] As shown in Figures 6-8, the present invention also discloses a high-speed switching valve island drive method.

[0070] The valve island system of the present invention consists of multiple unit valves 2, each unit valve 2 containing an electromagnetic component and a switching component 42.

[0071] The steps to implement this method are as follows:

[0072] S100, Initial Stage: Number the electromagnetic components corresponding to each group of unit valves 2 for subsequent control and management. Simultaneously, acquire real-time operating parameters of the electromagnetic coil 312 and switching element 42, including current limit values ​​and fundamental frequency.

[0073] S200. During the driving process, the system monitors the current value passing through each electromagnetic unit 3 in real time to ensure that the current fluctuates within a safe range and avoids overheating or damage. At the same time, the system also captures the rising and falling edge signals of the switching element 42 and calculates the duty cycle of the input signal, which can reflect the characteristics and requirements of the input signal and provide a basis for subsequent control strategies.

[0074] S300: Determine whether unit valve 2 is in the holding phase, and determine whether to open the next unit valve 2 based on the detection result.

[0075] The operation of the electromagnetic unit 3 of the present invention is divided into three stages: strong excitation stage, holding stage and shutdown stage.

[0076] Strong excitation stage: When it is necessary to quickly open unit valve 2, the system first enters the strong excitation stage. In this stage, by controlling the switching element 42 located at both ends of the electromagnetic unit 3, the electromagnetic component is excited with a high current and frequency, thereby quickly generating sufficient magnetic force to attract the valve core 21 to move, realizing the rapid opening of unit valve 2.

[0077] During the strong excitation phase, the current flows sequentially through the positive terminal of the power supply, the high-side MOSFET, the electromagnetic coil 312, the low-side MOSFET, and the power supply ground. The strong excitation phase opening time of different valves is between 0.9ms and 2.2ms, during which time the high-side and low-side MOSFETs remain fully open. The high-side and low-side MOSFETs are switching devices 42 connected to the two ends of the coil, respectively.

[0078] Hold Phase: Once unit valve 2 is fully open, the system enters the hold phase. During this phase, the high (or low) MOSFET remains fully open, while the control signal for the low (or high) MOSFET is a base frequency of 5kHz with a duty cycle of 5% to 7%. When the low-side MOSFET is on, the current direction is the same as that during the strong excitation phase. When the low-side MOSFET is off, the current flows through the diode, the high-side MOSFET, and the electromagnetic coil 312 in sequence for freewheeling.

[0079] Closing phase: When unit valve 2 needs to be closed, the high and low side MOSFETs remain fully closed. Under the inductance of the coil (6-2), the current flows sequentially through the power supply ground, diode, coil, diode, and power supply positive terminal to charge the power supply, causing the current in the electromagnetic coil 312 to drop rapidly. As a result, the electromagnetic force on the armature 32 decays faster, causing the valve core 21 to close faster under the action of the spring.

[0080] In scenarios requiring the simultaneous opening of multiple unit valves 2, this invention employs an intelligent multi-valve control strategy. The system first acquires the fundamental frequency value of the switching element 42 and the duty cycle of the input signal. Then, based on this information, it determines whether the previous unit valve 2 is already in the holding phase. Only if the previous unit valve 2 has stably opened and entered the holding phase will the system continue to open the next unit valve 2. This sequential control strategy ensures that each unit valve 2 operates safely and stably, avoiding current overload or system instability problems caused by simultaneously opening multiple valves.

[0081] For example, if the microcontroller detects a transition from 1 to 16 (Figure 8), it will first open valve 1, and when the current of valve 1 enters the holding phase, it will then open valve 2, and so on, until all four valves are open (other cases are similar, such as from 1 to 4, 1 to 8, 1 to 13, etc.); that is, when it is detected that two or more valves need to be opened simultaneously, the above control strategy is adopted.

[0082] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the inventive concept should fall within the protection scope of the present invention. All technical contents for which protection is sought in this invention are fully described in the claims.

Claims

1. A digital solenoid valve island, characterized in that, The solenoid valve island includes: A valve island body having multiple cavities, each cavity having an opening at one end, and the valve island body having channels for fluid to pass through; At least two unit valves are respectively disposed in the cavity, for cooperating with the solenoid valve body to conduct or cut off the fluid passing through the solenoid valve island; An electromagnetic unit is disposed within the cavity and is used to drive the unit valve to perform actions to achieve conduction or cut-off. The electromagnetic unit is coupled to the unit valve, and the number of electromagnetic units corresponds to the number of unit valves. A control unit, located on the valve island body, is used to control the operation of the electromagnetic unit and provide a power source; The control unit can drive the electromagnetic unit to control the conduction ratio of the unit valve.

2. The digital solenoid valve island according to claim 1, characterized in that, The unit valve includes a valve core and a valve sleeve with a discharge port. The valve sleeve is fixed in the cavity, while the valve core is movably disposed in the valve sleeve and can move up and down in the valve sleeve. The electromagnetic unit is also located within the cavity. The electromagnetic unit includes a coil assembly, which is connected to the control unit. The valve island body is also provided with an adjusting member for fixing and adjusting the position of the coil assembly. The valve core can be attracted by the coil assembly after being energized, and the conduction ratio of the corresponding unit valve can be controlled by controlling the magnetic force of different coil assemblies.

3. The digital solenoid valve island according to claim 2, characterized in that, The electromagnetic unit also includes an armature, which is used to increase the magnetic flux when the coil assembly is working, thereby increasing the magnetic force. The armature is disposed between the coil assembly and the valve core, and the armature is fixedly connected to the valve core. The coil assembly has a groove, and an elastic element is provided in the groove. One end of the elastic element abuts against the armature to press the valve core and provide a reset force.

4. The digital solenoid valve island according to claim 3, characterized in that, The coil assembly includes at least one mounting base with a cavity and at least one electromagnetic coil. One end of the cavity has an opening, and the electromagnetic coil is fixedly disposed in the cavity. The cavity is filled with a sealing and insulating compound after the electromagnetic coil is installed inside it, in order to fix the electromagnetic coil. The coil is insulated and sealed.

5. The digital solenoid valve island according to claim 2 or 4, characterized in that, The adjusting component is a threaded fastener. The valve island body is provided with a threaded groove that communicates with the cavity. The threaded fastener passes through the threaded groove and cooperates with the coil assembly. Rotating the threaded fastener can control the tightness of the coil assembly.

6. The digital solenoid valve island according to claim 5, characterized in that, The lower part of the outer side of the valve core is provided with a sharp edge, and the lower part of the valve sleeve is provided with a chamfer that cooperates with the sharp edge to cut off the fluid. When the sharp edge abuts against the chamfer, the unit valve is closed. The valve sleeve has a flow guide hole on its side, and the valve core has an annular groove on the same horizontal plane as the flow guide hole. A storage cavity is formed between the annular groove and the valve sleeve for temporarily storing the fluid passing through the solenoid valve body.

7. The digital solenoid valve island according to claim 6, characterized in that The valve core is also provided with evenly distributed pressure equalization grooves to prevent the valve core from jamming under high pressure. The pressure equalization grooves are located above the annular groove.

8. The digital solenoid valve island according to claim 7, characterized in that The valve island body is also provided with a cover for protecting the control unit, and the cover and the valve island body are fitted together to form a cavity for accommodating the control unit; The control unit is arranged in the cavity, and the cavity is filled with epoxy resin for insulating and sealing the control unit.

9. The digital solenoid valve island according to claim 8, characterized in that The top of the cover is further provided with a wire pressing plate, the outgoing wire of the coil assembly is connected with the control unit, and the power line and the signal line on the control unit pass through the cover and are fixed by being pressed by the wire pressing plate.

10. A digital solenoid valve island control method, characterized by, The control method is implemented based on the digital electromagnetic valve island according to any one of claims 1-9, and the control method comprises: The start and stop of the coil assembly are controlled to control the conduction or interruption of different unit valves, so as to control the flow ratio of the whole valve island. The coil assembly can control the output of the electromagnetic valve island in different stages according to a preset control scheme.

Images