1. Solenoid valve is divided into three categories in principle:Direct acting solenoid valvePrinciple: When energized, the electromagnetic force generated by the electromagnetic coil is lifted from the valve seat to open the valve; Power off, the electromagnetic force disappears, the spring to close the parts on the valve seat, the valve is closed.Features: In vacuum, negative pressure, zero pressure can work normally, but the diameter is generally not more than 25mm.Step direct acting solenoid valvePrinciple: It is a combination of direct action and pilot principle, when there is no pressure difference between the inlet and outlet, energized, the electromagnetic force directly to the pilot small valve and the main valve closing parts in turn up, the valve open. When the inlet and outlet reach the starting pressure difference, energized, the electromagnetic force pilot small valve, the main valve chamber pressure rises, the upper chamber pressure drops, so as to use the pressure difference to push the main valve upward; When the power is off, the pilot valve uses spring force or medium pressure to push the closing parts, moving down, so that the valve is closed.Features: In zero pressure difference or vacuum, high pressure can also be perfect action, but the power is large, must be installed horizontally.Pilot solenoid valvePrinciple: When energized, the electromagnetic force to open the pilot hole, the chamber pressure drops rapidly, forming a low and high pressure difference around the closing parts, fluid pressure to push the closing parts move up, the valve is opened; Power off, the spring force to close the pilot hole, the entrance pressure through the bypass hole quickly chamber around the valve close parts to form a low high pressure difference, fluid pressure to push the closing parts move down, close the valve.Features: The upper limit of fluid pressure range is high, can be installed arbitrarily (need to be customized) but must meet the conditions of fluid pressure difference.2, the solenoid valve from the valve structure and material and the difference in principle, is divided into six branch subclasses: direct acting diaphragm structure, step direct acting diaphragm structure, pilot diaphragm structure, direct acting piston structure, step direct acting piston structure, pilot piston structure.3, solenoid valve according to function classification: water solenoid valve, steam solenoid valve, refrigeration solenoid valve, low temperature solenoid valve, gas solenoid valve, fire solenoid valve, ammonia solenoid valve, gas solenoid valve, liquid solenoid valve, micro solenoid valve, pulse solenoid valve, hydraulic solenoid valve normally open solenoid valve, oil solenoid valve, DC solenoid valve, high pressure solenoid valve, explosion-proof solenoid valve, etc.
Solenoid valve has a closed chamber, open a through hole in different positions, each hole is connected to different tubing, the middle of the chamber is a piston, two sides are two electromagnets, which side of the magnet coil energized valve body will be attracted to which side, by controlling the movement of the valve body to open or close different oil holes, and the oil inlet hole is often open, hydraulic oil will enter a different oil discharge pipe, Then the pressure of the oil pushes the piston of the cylinder, which in turn drives the piston rod, which drives the mechanism. In this way the mechanical motion is controlled by controlling the current break of the electromagnet.
The Solenoid valve is an electromagnetic controlled industrial equipment. It is an automatic basic component for fluid control. The solenoid valve is an actuator, not limited to hydraulic or pneumatic. Used in industrial control systems to adjust the direction, flow, speed, and other parameters of media. Solenoid valve can cooperate with different circuits to achieve the desired control, and the control accuracy and flexibility can be guaranteed. There are many kinds of solenoid valves, different solenoid valves play a role in different positions of the control system, the most commonly used is check valve, safety valve, direction control valve, speed regulating valve, etc.