What is manual override gearbox

The SD series manual override gearbox is an essential component of the automation control system, working in concert with the pneumatic actuator. The main objective of this device is to enable the smooth operation of butterfly valves, ball valves, piston valves, and other valves that require a 90° angular movement for opening and shutting. The SD series gearbox is designed for manual operation, but it can also be used in situations where manual drive is needed for automatic control systems and mechanical products.

The SD series manual override gearbox is highly versatile and can be effectively utilised in various industries such as petroleum, chemical, pharmaceutical, water treatment, power plants, and nuclear power. It is specifically designed to support the operation of 90-degree open ball valves, butterfly valves, plug valves, and other types of valves. Additionally, the company offers manual clutches that are compatible with these valves. The speed ratio, use temperature, protection level, and anti-corrosion level of the product can also be customised according to customer requirements. Modify personalisation. The company operates in both domestic and international markets, with a customer base mostly located in the Middle East, Europe, and The United States and other renowned international valve companies

Manual Operation: Lift the limit pin and turn the switching handle, rotating it upward on the left side to the manual limit position to ensure it's properly in place. Then, the turbine worm gear engages, allowing you to open and close the valve by turning the handwheel.

Automatic Operation: Lift the limit pin and turn the switching handle, rotating it upward and downward to the automatic limit position to confirm it's properly in place. Afterwards, the turbine worm gear disengages, and turning the handwheel results in idle operation.

Note: When rotating the switching handle up and down, there may be instances of sticking, caused by the turbine worm gear engagement. Simply lightly shake the handwheel to eliminate this sticking phenomenon.