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.
Typically this pump is a neoprene vane impeller type of pump. Remove the cover plate and inspect the impeller for damage or missing blades. Also, there is a cam in one side of the pump housing that compresses the vanes as the impeller rotates. This is what causes the rotating impeller to pump water.