Answer: Both the worm gear butterfly valve and the handle butterfly valve are valves that need to be manually operated, so they are also collectively referred to as manual butterfly valves. The two modes of operation are common to small-diameter butterfly valves. The difference lies in the large diameter butterfly valve. Specifically in the following aspects:
Handle operation is suitable for butterfly valves with diameter less than or equal to DN200; butterfly valves with diameter within DN200 can also be operated by worm gear. However, if it exceeds the diameter of DN200, it is generally recommended that you use worm gear operation.
The reason is: as the diameter of the butterfly valve increases, the torque will also increase. When the diameter exceeds DN200, it will be very difficult to use the handle to operate. The larger the caliber, the more laborious the handle is to operate. If the handle is pulled with brute force, it may cause damage to the valve.
Therefore, when the diameter exceeds DN200, the butterfly valve is suitable for worm gear drive, which is labor-saving and convenient.