Product Description Description   HDM De-clutchable wormgear offers simple and reliable manual positioning of the valves, dampers and other quarter-turn devices when overriding existing pneumatic, electric or hydraulic quarter-turn actuators. All unit are suitable for both indoor and outdoor installation. The modular design is to provide the most efficient and effective solution to a full … Continue reading China Best Sales Manual Override Declutchable Gear Box for Pneumatic Actuator and Valve cycloidal gearbox