The main part of the ball valve is ball which has a hole in middle. When that ball rotate 90 degree it close or open. They are useful for applications which have to be rapid.
Advantages;
Minimal loss of pressure
Easy to opening and closing
Good leak tightness
Compact design
TGV-20 occurs from 3 parts. Because of their configuration they provide minimal loss of pressure
Actuators can assembly easily.
