Direct actuated solenoid valve:

Principle: when the power is on, the electromagnetic coil generates electromagnetic force, and the closing part is lifted from the valve seat, and the valve is opened. When the power is cut off, the electromagnetic force disappears, and the spring closes the closing part on the valve seat, and the 24 Volt Solenoid Valve 2W Series closes.

Characteristics: normal work in vacuum, negative pressure, zero pressure, but the path generally does not exceed 25mm.

Distributed direct actuated solenoid valve:

Principle: it is a direct and pilot combined principle. When there is no pressure difference between the inlet and outlet, the electromagnetic force will directly lift the pilot small valve and the main valve closing piece up, and the valve opens. When the entrance and exit to start pressure, 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 medium pressure to promote the closure of parts moving down, the valve closes.