PURPOSE: To quickly and accurately control plural air streams in an air system by fixing remote control system air regulators provided with inexpensive on-off servo control valves to a bracket and operating the regulators with a pulse width modulating circuit.

CONSTITUTION: An air stream 22 for operating powder coating system 24 is controlled by an electronic air regulating system 20. The air regulator 25 has a high-pressure air input line 26 and a controlled pressure output line 28, and pressure-controlled air is sent out to the system 24. The air regulator 25 is provided with a pilot air controlling part 30 and is operated by on-off solenoid valves 32, 34 for charging and ventilation. A converter 36 monitors pressure of air output to the output line 28, a converter signal is emitted to a control circuit 38, thereby compairing a pressure of air output with a proper quantity to send solenoid signal to the valves 32, 34. Then the pilot air controlling part 30 connects a ventilation line 46 to vent an excess air into atmosphere.