The conventional steam jet ejector has four basic parts; the steam chest, the nozzle(s), the mixing chamber and the diffuser. The diagram at left illustrates basic ejector operation: a high pressure motivating fluid enters at 1 and expands through the converging-diverging nozzle to 2; the suction fluid enters at 3 and mixes with the motivating fluid in the mixing chamber 4; both are then recompressed through the diffuser to 5.

EJECTOR TYPES

Multiple-Nozzle Ejector
Croll-Reynolds Multiple-Nozzle Ejectors (above) are unique in both design and performance. In most cases, they offer steam savings of 10% to 20% when compared with single-nozzle units designed for the same conditions.

Spindle-Operated Ejector
Spindle-Operated Ejectors (above) are indicated whenever suction or discharge pressures vary. During operation, a pneumatically-driven tapered spindle moves in and out of the nozzle orifice to control motive fluid flow.