Regarding the valve voltage rating
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The last edit to this post was made by The project’s progress on 2024-7-29 at 21:34. I have a question: for electric valves and solenoid valves, the voltages available are 24V, 220V, and 380V. What determines which voltage should be used? Could it be considered this way: either one will do, as the pipe diameter and pressure parameters can affect torque, and torque is related to power; when the output power remains the same, the lower the voltage, the higher the current. If a high level of torque is required, 380V should be used, resulting in a lower current. Is this how it should be understood? If so, is the solenoid valve considered in the same way? The pipe diameters are DN150 and 125 for the fire water pipes; the pressure is 0.7 MPa. I’m not sure whether a 220V electric valve will work in this setup
When selecting the voltage rating for electric valves and solenoid valves, several factors need to be taken into consideration: 1. **On-site power supply conditions**: First, it is necessary to consider the type of power source available on site, including its voltage rating. The supply voltages commonly seen in industrial settings are 220V and 380V. 2. **Safety considerations**: Low-voltage devices are relatively safer, especially in humid or other hazardous environments. For example, 24V devices present a lower risk when touched, making them suitable for applications with high safety requirements. 3. **Equipment power requirements**: Your considerations regarding torque and power are correct. The torque requirement for electric valves depends on factors such as valve size and medium pressure. If higher torque is required, a motor with a higher voltage may be chosen to reduce the current and minimize heat loss in the cables. For solenoid valves, their operation generally does not involve large currents or high torque; their main function is to control the opening and closing of valves. The selection of solenoid valves primarily takes into account their response time and tolerance to frequent operation. The voltage selection is also based on power supply conditions and safety requirements. In short, whether to use 24V, 220V, or 380V depends mainly on the on-site power supply conditions and the specific power requirements of the equipment. Different voltages have their own advantages and limitations; the choice should be made by taking into account the on-site environment, safety considerations, and equipment requirements. .
I mean, what should be used to select the voltage level?
Over 220 – why choose electrical work? Do you really have to do everything by yourself?
24V is generally chosen in explosion-proof areas. The higher the voltage, the lower the current required, and the smaller the wire diameter of the coil can be. The solenoid valve is not a device that generates torque; it functions by using minimal force to overcome the resistance of the spring inside it, thereby moving the valve stem slightly. At this point, the force of the fluid is utilized to move the valve stem into position. If it is used in an oil circuit, this fluid is oil; if it is used in a gas circuit, it is compressed air. I haven’t looked into electric valves; there might be a small motor inside that drives the gears to rotate, thereby operating the valve.
This post was last edited by mutianly on 2024-8-2 at 10:36. If solenoid valves are used for pneumatic valves, it is generally advisable to choose solenoid valves that consume low power and operate on a 24V supply. Pneumatic valves rely on instrument air to control their operation, and the solenoid valve acts as a switch to turn this instrument air on or off. For larger diameter valves, amplifiers can be used; it is useful to take a close look at the air circuit of large-diameter pneumatic valves in practice – usually, the instrument air pipe supplying air to the cylinder is made thicker. Electric valves need to be matched in terms of torque and voltage based on the actual conditions. 220V is commonly used for electric fire water valves.