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The main classification of electromagnetic valve:
From the principle of electromagnetic valve is divided into three categories:
1) direct acting solenoid valve:
Principle: power, the electromagnetic coil of electromagnetic force to close the cases mentioned, from the seat on the valve open; power, the electromagnetic force disappears, the spring pressure to close the file on the seat, the valve closed.
Features: in a vacuum, negative pressure, zero pressure can work, but the path is generally not more than 25mm.
2) step direct acting solenoid valve:
Principle: it is the principle of a direct acting and pilot combination of inlet and outlet, when there is no pressure, the power, the electromagnetic force directly to the pilot valve and main valve is closed parts turn upward, the valve opens. When the inlet and outlet pressure to start, the power, the electromagnetic force pilot valve, main valve chamber under increased pressure, the chamber pressure drops, which use pressure to push up the main valve; power, the pilot valve with a spring or to medium pressure to promote the closure of parts moving down, close the valve.
Features: zero pressure or vacuum, high pressure can also be * action, but the power is larger, the level required to be installed.
3) pilot type solenoid valve:
Principle: power, the electromagnetic force to open the pilot hole, the chamber pressure to drop rapidly in close formation around the lower parts of high pressure, fluid pressure to promote the closure of parts moving up, the valve open; power, the spring force of the pilot hole closed, the inlet pressure chamber through the bypass hole quickly formed under low on the high pressure around the valve off, fluid pressure to promote the closure of parts moving down, close the valve.
Features: limit the scope of a high fluid pressure, can be arbitrarily install (need to customize) but must meet the conditions of fluid pressure.
2, solenoid valve from different and principle of the valve structure and materials on, divided into six branch categories: diaphragm structure, step by step direct acting diaphragm structure, the pilot diaphragm structure, direct acting piston structure, direct acting piston structure step by step, the pilot piston structure of direct action.
3, solenoid valve according to the functional classification: water solenoid valve, steam solenoid valve, solenoid valve, electromagnetic valve, cryogenic gas solenoid valve, solenoid valve, electromagnetic valve, ammonia gas solenoid valve, electromagnetic valve, liquid micro electromagnetic valve, electromagnetic valve, solenoid valve normally open solenoid valve, oil solenoid valve, solenoid valve, high pressure DC electromagnetic valve, explosion-proof electromagnetic valve.
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