Cross Head of Reciprocating compressors
https://youtu.be/Xk2IGrFCm3c Unlike motors in which piston is directly connected to the connecting rod, there is a part called “Cross Head” between connecting rod and piston in some compressors.
Helical rotor of Screw compressors Equipment
https://youtu.be/-0n17qWeT9M Helical rotors are used to increase gas pressure in screw compressors. There are two helical rotors named “male” and “female” in screw compressors.