Introduction to the structural characteristics of high-temperature
solenoid valves
The solenoid valve is a valve that relies on the electromagnetic force generated by the power supply coil to drive the active iron core to open and close the valve disc. It is an industrial equipment controlled by electromagnetics and used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium.
Purpose of solenoid valves:
High-temperature solenoid valves are suitable for neutral pure gases, especially air, water, and other pipeline control systems; they are widely used in shipbuilding heavy industry, testing equipment, humidification equipment, hydraulic equipment, etc., and the working temperature is above 300℃ in the heat transfer system.
Structural characteristics of gas solenoid valves:
1. The valve core is a stainless steel piston type; the piston ring is made of special heat-resistant and wear-resistant materials.
2. The piston and the metal valve cavity do not produce direct friction, and the life span is ten times that of similar products.
3. The valve body has no restrictions on the installation direction and the action responds quickly.
4. The special coil adopts a heat dissipation structure, so it is not easy to burn.
5. After stopping the action for a long time and restarting, the action is also sensitive.
Working principle:
Normal closed: When the coil is energized, the electromagnetic core is attracted, the pressure relief hole is opened, the main piston is pushed by the medium pressure, the main valve port is opened, and the medium flows.
When the coil is de-energized, the main valve port is closed and the medium is cut off.
Normal open: When the coil is energized, the electromagnetic core is attracted, the pressure relief hole is closed, the main piston is pushed by the medium pressure, the main valve port is closed, and the medium is cut off.
When the coil is de-energized, the main valve port is opened and the medium flows.
Packed solenoid valves use packing, and the fluid does not contact the sleeve and iron core. They are mostly used for high temperature, low temperature or highly corrosive fluids. However, because of the packing box, the volume is large and the friction of the valve stem movement is increased, so they are less used. The power supply of the solenoid valve is divided into AC and DC. The solenoid valve using AC power is particularly fast, but it is easy to heat up and has a small opening and closing force. The solenoid valve using DC power is not easy to heat up, has a large opening and closing force, but does not move as fast as the AC one.
