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3/2-Way & 5/2-Way Solenoid Valve for Chemical Industry
Solenoid valve has found wide applications to industrial production, particularly in chemical industry. Apart from applying to the on-off control of water, air, neutral gases, and other gases and liquids compatible with solenoid valve materials, the solenoid valve can also be an indispensable part (3-way, 4-way and 5-way) of the safe interlocking protection system.
3/2-Way solenoid valve working principle
The 3-way 2-position (3/2-way) solenoid valve is made up of the valve body, valve cover, electromagnetic modules, spring, and sealing structure. The sealing block at the bottom of the movable iron core can make use of the spring pressure to turn off the valve inlet.
When the power is on, there is coil excitation and the solenoid valve absorption. The sealing block with the spring above the movable iron core can turn off the exhaust port. The flow will then flow from the air inlet into the valve to realize control. When the power is off, the electromagnetic force disappears, and the movable iron core leaves the fixed iron core position and moves downwards under the action of the spring. After that, the exhaust port is opened to block the inlet. The valve will also change the on/off status because of no air supply.
4/2-Way and 5/2-Way solenoid valve working principle
The working principle of 4-way 2-position solenoid valve and the 5-way 2-position solenoid valve is the same. The only difference is that the 4/2-way solenoid valve has one outlet, while the 5/2-way one has two outlets.
As to their working principle, when the current flows by the coil, the excitation is generated, which results in absorption of the movable iron core by the fixed iron core. The movable iron core will drive the slide valve core and compress the spring to change the position of the slide valve core and change the direction of the fluids. When the coil is disconnected with power, the spring force can move the slide valve core and push back the movable iron core so that the fluid will move in the original direction.
Interlocking control of the solenoid valve in chemical industry
1. 3-way 2-position (3/2-way) normally closed solenoid valve interlocking control
Under the normal state, the 3/2-way NC solenoid valve is connected with power, and the inlet 1 is opened, but the outlet 2 is closed. The air circuit 1-3 is connected. The normal air supply for the valve is cut off. The gas-open stop valve is turned on, while the gas-closed stop valve is turned off. Under the interlocking state, the inlet 1 is closed and the outlet 2 is opened. The air circuit 2-3 is connected. The air supply for the stop valve is interrupted. The spring of the actuating machine resets. At the moment, the gas-open stop valve is closed, and the gas-closed stop valve is opened.
2. 5-way 2-position (5/2-way) single solenoid valve interlocking control
The stop valve should be closed in terms of interlocking. Under the condition of normal conditions, the instrument' s air direction is 1 - 4. Via the stop valve, the air flows into B air cylinder and discharges from the A air cylinder. Then, all the air is pumped out through the terminal 2-3 of the 5/2-way single solenoid valve. When interlocking happens, the instrument air flows from 1 to 2. Via the stop valve, the air flows into the A air cylinder and discharges from the B air cylinder. Then, the air is fully pumped out from the terminal 4 - 5 of the 5/2-way single solenoid valve. If the stop valve should be opened in terms of interlocking, the instrument air flow direction is 1 to 2 upon normal operations. Via the stop valve, the air flows into A air cylinder and discharges from the B air cylinder. Then, the air is fully pumped out from the terminal 4 - 5 of the solenoid valve. When interlocking happens, the instrument air flows from 1 to 4. Via the stop valve, the air flows into B air cylinder and discharges from A air cylinder. Then, all the air is pumped out from the terminal 2 - 3 of the 5/2-way single solenoid valve.
3. 5-way 2-position (5/2-way) double solenoid valve interlocking control
Generally, the inlet and outlet of air cylinders A and B of the actuating mechanism realizes on and off of the valve via the stop valve according to interlocking. However, when there are power source faults, the double solenoid valve can be chosen to maintain the electrical failure. On and off of the valve resulted from the operation of the solenoid valve magnetic core are accomplished by two coils, which are known as the double solenoid valve.
As the coil S1 of 5/2-way double solenoid valve receives the interlocking signal 1, the instrument' s air direction is 1 - 4. Via the stop valve, the air flows into B air cylinder and discharges from the A air cylinder. Then, all the air is exhausted via the ports 2 - 3 of solenoid valve, to make the stop valve open. If the power fails now, the stop valve will keep open as long as the coil S2 of double solenoid valve does not receive the interlocking signal 2. Once S2 receive the interlocking signal 2, the instrument' s air direction is 1 - 2, the air flows into air cylinder A and discharges from the B air cylinder. Then all the air is exhausted via the ports 4 - 5 of solenoid valve, to make the stop valve close.
In general, the double solenoid valve can avoid movement of the stop valve because of power loss when there are power source faults, and the stop valve can stay at the position before the power fault. In the practical design process, selection of the single or double solenoid valve should be based on its own procedures and meet the interlocking requirements.
3/2-Way solenoid valve working principle
The 3-way 2-position (3/2-way) solenoid valve is made up of the valve body, valve cover, electromagnetic modules, spring, and sealing structure. The sealing block at the bottom of the movable iron core can make use of the spring pressure to turn off the valve inlet.
When the power is on, there is coil excitation and the solenoid valve absorption. The sealing block with the spring above the movable iron core can turn off the exhaust port. The flow will then flow from the air inlet into the valve to realize control. When the power is off, the electromagnetic force disappears, and the movable iron core leaves the fixed iron core position and moves downwards under the action of the spring. After that, the exhaust port is opened to block the inlet. The valve will also change the on/off status because of no air supply.
4/2-Way and 5/2-Way solenoid valve working principle
The working principle of 4-way 2-position solenoid valve and the 5-way 2-position solenoid valve is the same. The only difference is that the 4/2-way solenoid valve has one outlet, while the 5/2-way one has two outlets.
As to their working principle, when the current flows by the coil, the excitation is generated, which results in absorption of the movable iron core by the fixed iron core. The movable iron core will drive the slide valve core and compress the spring to change the position of the slide valve core and change the direction of the fluids. When the coil is disconnected with power, the spring force can move the slide valve core and push back the movable iron core so that the fluid will move in the original direction.
Interlocking control of the solenoid valve in chemical industry
1. 3-way 2-position (3/2-way) normally closed solenoid valve interlocking control
Under the normal state, the 3/2-way NC solenoid valve is connected with power, and the inlet 1 is opened, but the outlet 2 is closed. The air circuit 1-3 is connected. The normal air supply for the valve is cut off. The gas-open stop valve is turned on, while the gas-closed stop valve is turned off. Under the interlocking state, the inlet 1 is closed and the outlet 2 is opened. The air circuit 2-3 is connected. The air supply for the stop valve is interrupted. The spring of the actuating machine resets. At the moment, the gas-open stop valve is closed, and the gas-closed stop valve is opened.
The stop valve should be closed in terms of interlocking. Under the condition of normal conditions, the instrument' s air direction is 1 - 4. Via the stop valve, the air flows into B air cylinder and discharges from the A air cylinder. Then, all the air is pumped out through the terminal 2-3 of the 5/2-way single solenoid valve. When interlocking happens, the instrument air flows from 1 to 2. Via the stop valve, the air flows into the A air cylinder and discharges from the B air cylinder. Then, the air is fully pumped out from the terminal 4 - 5 of the 5/2-way single solenoid valve. If the stop valve should be opened in terms of interlocking, the instrument air flow direction is 1 to 2 upon normal operations. Via the stop valve, the air flows into A air cylinder and discharges from the B air cylinder. Then, the air is fully pumped out from the terminal 4 - 5 of the solenoid valve. When interlocking happens, the instrument air flows from 1 to 4. Via the stop valve, the air flows into B air cylinder and discharges from A air cylinder. Then, all the air is pumped out from the terminal 2 - 3 of the 5/2-way single solenoid valve.
Generally, the inlet and outlet of air cylinders A and B of the actuating mechanism realizes on and off of the valve via the stop valve according to interlocking. However, when there are power source faults, the double solenoid valve can be chosen to maintain the electrical failure. On and off of the valve resulted from the operation of the solenoid valve magnetic core are accomplished by two coils, which are known as the double solenoid valve.
As the coil S1 of 5/2-way double solenoid valve receives the interlocking signal 1, the instrument' s air direction is 1 - 4. Via the stop valve, the air flows into B air cylinder and discharges from the A air cylinder. Then, all the air is exhausted via the ports 2 - 3 of solenoid valve, to make the stop valve open. If the power fails now, the stop valve will keep open as long as the coil S2 of double solenoid valve does not receive the interlocking signal 2. Once S2 receive the interlocking signal 2, the instrument' s air direction is 1 - 2, the air flows into air cylinder A and discharges from the B air cylinder. Then all the air is exhausted via the ports 4 - 5 of solenoid valve, to make the stop valve close.
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