Abstract: A rotating spray head (2) includes a hollow stem (4) to which a body (18) is rotatably mounted. The body has a generally cylindrical outside surface (14) and distal and proximal ends (18,16); the ends have generally U-shaped edges (49). The inlet stem and body define a generally cylindrical reservoir (38) therebetween. A pair of offset side nozzles (42) are formed through the outside surface of the body. End nozzles (48) are formed through each of the U-shaped edges. Liquid flows from the reservoir through the side nozzles along offset flow paths to spin the body and through the end nozzles along flow paths passing generally through the axis. The rotating spray head thus provides a simple, compact spray nozzle which can provide a full 360.degree. spray pattern.

Abstract: A low-flow stator (4), used upstream of a rotor (27) of a tank cleaning machine, includes a body (6) having a plurality of generally helical passageways (38) extending from a front surface (10) of the body to a rear surface (12) of the body. Each passageway has an entrance (40) and an exit (42), the exit being completely circumferentially offset from its corresponding entrance.