Computers and Electronics What is a pneumatic diaphragm pump? What is a pneumatic pump? Pneumatic pumps are well known as positive displacement pumps that are double-acting with no return spring. They are capable of utilizing many pressurized gases or fluids as drivers. Related Posts:What do you mean by positive displacement pumps give examples?What system is the oil pump in?What is a pump cover for gym?What is the difference between deep and shallow well?