Water and Wastewater Terms Beginning R

A B C D E F G H I J K L M N O P Q R S T U V W Y Z

rotary pump

A type of displacement pump consisting essentially of elements rotating in a close-fitting pump case. The rotation of these elements alternately draws in and discharges the water being pumped. Such pumps act with neither suction nor discharge valves, operate at almost any speed, and do not depend on centrifugal forces to lift the water.