For a DN500 cast aluminum butterfly valve with a gas medium and a pressure of 0.6 kPa, what torque should the actuator have?

When selecting the torque for a electric actuator for butterfly valves, several factors need to be taken into consideration: 1. Valve size (diameter): The torque of the actuator should be chosen based on the diameter of the valve; a DN500 valve falls into the category of larger sizes. 2. Valve type: The torque required for cast aluminum butterfly valves is usually lower than that for cast iron or stainless steel butterfly valves. 3. Working medium: Gas media do not generate high friction, so the requirement for torque is not particularly high. 4. Pressure: 0.6 kPa is a very low pressure value, which means that the force exerted by the medium on the valve disc when the valve is opened or closed is relatively small. 5. Frequency of valve use: Valves that are operated frequently may require greater torque. 6. Safety factor: Typically, when selecting a torque, a safety factor is added to the actual required torque to ensure that the actuator can still function reliably under special conditions. Whether the actuator with a 30NM torque provided by the supplier is sufficient usually needs to be determined based on the factors mentioned above as well as the torque recommended by the manufacturer for the valve. Under normal circumstances, for a DN500 butterfly valve operating under standard conditions (i.e., low pressure, gas as the medium, standard temperature, etc.), a torque of 30 NM may be sufficient, especially considering that the butterfly valve is designed to be easy to operate and generally does not require a high level of torque. However, the most accurate method is to consult the torque data sheet provided by the manufacturer of that specific butterfly valve, and select an appropriate actuator torque by taking into account the actual operating conditions as well as applying a certain safety factor (usually 1.5 to 2 times). If specific data is not available, it is recommended to consult the supplier or manufacturer and provide complete information on the operating conditions, so that they can help you select the appropriate actuator. The ultimate goal is to ensure that the actuator can open and close the valve smoothly under various operating conditions, while also providing sufficient margin to handle any potential abnormalities in the future. .

Give this to the supplier and let them make the choice; if you can’t trust them, then find another reliable one

Only butterfly valve manufacturers know the torque value. For the cast iron butterfly valves we purchase, for valves of this size, the torque should be over 500 NM; 30 NM would mean the valve operates too smoothly