The valve worm gear, worm gear , cam rotation at a predetermined location along the signal contacts on the device pressed or released , the corresponding output "on" "off" signal , indicating the butterfly valve open or closed.
2. trench characteristics of butterfly valves
1.A small, lightweight , easy installation and maintenance , and may have installed anywhere .
2. the structure is simple, compact , 90 ° turn open and close quickly .
3. the operating torque, energy saving.
4.Flow curve tending to straight , good regulating performance .
5. the opening and closing of tests up to tens of thousands of times , long life.
6. to be completely sealed , gas leakage test is zero.