Solenoid valves are electromagnetic controlled industrial equipment used in industrial control systems to adjust the direction, flow, speed and other parameters of the media. Solenoid valve is controlled by the electromagnetic effect, the main control by the relay control. In this way, the solenoid valve can cooperate with different circuits to achieve the desired control, while the control accuracy and flexibility can be guaranteed. There are many kinds of solenoid valves, different solenoid valves in the control system to play a role in different locations. Steam solenoid valve is composed of two major components of the deputy valve and the main valve of the pilot valve opens the second valve. Valve is based on the opening and closing to control the main valve on-off. According to the power switch when the state is different, can be divided into normally closed solenoid valve and normally open solenoid valve. Steam normally closed solenoid valve in the power-off position, the deputy valve port closed, the main valve was open, when the electrical signal into the pilot valve coil, the activities of the core suction by the electromagnetic force to open the deputy valve port, the main valve cup Pressure quickly disappear, the media pressure will be the main valve cup holder, open the main valve port, the working medium can be hard to circulate. However, when the signal disappears, the activities of the core reset, the closure of the Deputy valve port, the working medium from the balance hole into the valve cup, when the pressure tends to balance, by the main valve spring, valve cup weight and medium pressure so that the valve cup Move, tightly seal the main valve port, the valve was closed again. Steam normally open solenoid valve in the power-off position, the role of the spring, vice port open, the main valve circulation. When the signal enters the vice valve coil, the movable iron core sucked by the electromagnetic action, the deputy valve port closed, the working medium into the valve cup through the balance hole, when the pressure tends to balance, by the main valve spring, valve cup deadweight and medium Pressure down the valve cup, tightly seal the main valve port, the valve was closed. When the main valve is cut off, the electromagnetic force disappears and the auxiliary valve is opened. The pressure in the main valve cup disappears rapidly. The medium pressure holds the main valve cup and opens the main valve port. The medium is in circulation and the valve is open.
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