Why is the front of the valve added to the national standard and the standard of American standard?

American standard valves are the meaning of American standards, commonly called American standard ball valves, American standard gate valves and other valves ar...

The key points and functions of intelligent electric device

1. Main characteristics of electric apparatus:● adopt the large scale digital integrated chip, the function is strong, the precision is high. ● mechanical and e...

Fifteen performance characteristics of rottok electric power plant

Electric device according to the motion method is divided into: angle stroke, straight stroke and multi - rotation. It is a driving device that can provide a st...