Profile: Ningbo potter pneumatic components co., LTD specializes in the manufacturing of pneumatic components. Our products include air treatment unit, solenoid valve, pneumatic fitting, directional valve, stop fittings, speed controllers, cylinders and brass fittings. We are an ISO 9001:2016 certified company. Our air control valves keeps the pressure safe of the return circuit. It prevents the cylinder work itself after it goes out of work. The position accurate once the cylinder work off.