Cazuela de Vaca (Beef and Pumpkin Stew) This hearty Chilean stew of beef, corn, and pumpkin is a one dish meal. The main ingredients are stewed in serving-sized pieces, so that each person receives a large piece surrounded by a broth with the other vegetables.
Quick Answer. A rotary vane vacuum pump works by using centrifugal force to turn blades against the circular surface of a cylinder whereby pockets of air are pushed from an inlet port to an outlet port as air pressure increases.
A pump piston is a moving component that uses piston rings to create a seal, and transfers force in order to eject or compress fluid in the cylinder. Reciprocating pumps are either duplex (two cylinders) or triplex (three cylinders). These pumps may be powered by steam or air, or via a motor or engine's belt drive.