As for the determination of the output speed of the electric device, when there is no strict requirement on the opening and closing time of the valve, a slower speed should be selected as far as possible. Because of the unnecessary fast speed, the motor power will be increased under the same torque requirements, which will not only waste energy and increase the project cost, but also increase the volume of the electric device and cause waste in many aspects. At present, the number of motor specifications designed for the self-developed electric device in China is small (generally 2-3 specifications) in each frame number, and the speed ratio range of gear pair and worm gear pair in the main transmission is limited, so there are not many torque and speed divisions in each frame number.

Leakage elimination method for both ends of valve
1. Sealing gaskets on both sides fail
2. The tightening force of pipe flange is uneven or not compacted
3. Elimination method for failure of upper and lower sealing gaskets of sealing ring
1. Replace the sealing gasket
2. Compression flange bolt (evenly stressed)
3. Remove the pressure ring of the valve, replace the seal ring and the invalid gasket