Avcon Controls manufactures Plastic Pneumatic Piston Operated Valve. Avcon Controls is a manufacturer of Industrial Duty Automated Valves , Solenoid Valves. Plastic Pneumatic Piston Operated Valve is used For control of air, water, gas, steam in textile, power generator, paper & pulp, chemical,petrochemical industries, PSA nitrogen system, air dryers, gas generators & others. Plastic Pneumatic Piston Operated Valve has Self adjusting, Spring loaded, Teflon Packing