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Type and structure of screw air compressor inlet valve:

Piston intake valve: the piston in the air compressor intake door moves up and down to control the empty work of the air compressor.

When the air compressor starts, stops and offloads, air is supplied to the piston through the solenoid valve pneumatic inlet, so that the piston closes upward; After the air compressor works at full load, the exhaust of the piston chamber is stopped by electricity, so that the piston is discharged from the exhaust port. Because of the different intake pressure, the piston of the intake valve opens at full load, and the air compressor works at full load; When the pressure reaches the specified pressure limit, the piston is expelled through the exhaust and the piston of the intake valve is pushed up to close the intake valve. The air compressor is unloaded at this time. The structure consists of an air inlet, a valve cover, a piston, a base, an exhaust solenoid valve and so on.

Butterfly inlet control valve: when the screw air compressor is started, the valve plate of the variable solenoid valve inlet valve is closed to ensure the no-load start. When the motor runs under heavy load, the three-phase solenoid valve opens immediately after it is powered on, and the resulting intake servo cylinder pushes the valve stem of the servo cylinder to drive the intake butterfly valve to fully open and start heavy load operation.