Oxygen machine working process is controlled by the programmable controller five five-way pilot solenoid valve, and then by the solenoid valve control of the ten pneumatic pipe valve to open and close to complete. Five two-position five-way pilot solenoid valve, respectively, control the left suction, pressure, right suction state. The left suction, pressure, right suction time flow has been stored in the programmable controller, in the power state, the five two-way five-lead pilot valve are connected to the pneumatic valve valve closing port. When the process is in the left state, the control of the left suction solenoid valve power, the pilot gas connected to the left suction intake valve, left suction valve, the right exhaust valve opening, making the three valves open to complete the left suction process , While the right adsorption tower desorbs.

When the process is in the state of pressure, the control of the solenoid valve is energized, the other valve closed; pilot gas connected to the pressure valve opening, making the valve open to complete the pressure process. When the process is in the right suction state, the control of the right suction of the solenoid valve power, the pilot gas connected to the right suction intake valve, right suction gas valve, left exhaust valve opening, making the three valves open, complete the right suction process , While the left adsorption tower desorption. Each process, in addition to the valve should be opened, the other valves should be in a closed state.