Profile: Theoborn Auto-controI VaIves Co., Ltd. is involved in the manufacture of pneumatic actuator and all kinds of valves. Our pneumatic actuator's aluminum body possesses a honed internal surface coated with hone anode oxygenation for long life, low coefficient of friction and swift performance. Our actuator has two independent external travel stop adjustment bolts that can easily and precisely adjust Aħ5A° at both open and close directions.