Pinch Valves
Pinch valves are used in pneumatic conveying piping systems as shutter valves. Also, pinch valves are used in sack- packing machines.
Non-return-valve
Check valves or non-return valves allow product (or air) to flow in one direction and not the other.
Over pressure valves
At the inlet of silos filled by pneumatic conveying systems, a relief (overpressure) valve is needed to protect the silos.