The proportional solenoid valve is a single-stage direct-acting proportional solenoid valve. The valve provides a flow rate which is linearly proportional to the input current. The maximum air flow capacity is 120 SLPM with an inlet pressure of 25 psig and approximately 5 watts power requirement. The design incorporates a unique armature suspension features which eliminates friction and makes the valve inherently more reliable and exhibit very low hystersis. Response times are in the 20 millisecond range from 10% to 90% flow capacity.