Abstract: Apparatus particularly suited for use in mixing ammonia gas with hard water is disclosed. The apparatus includes an ejector assembly having a throat with a flexible tubular liner which is periodically flexed inwardly to loosen any solid matter which may have formed on the inside of the liner. The liner is flexed by a three-way valve connected to the water supply line and controlled by timers and a pressure switch. If desired, a similarly-lined tubular extension may be mounted downstream of the throat and flexed periodically to loosen any matter deposited therein. An orifice may be mounted in a diaphragm upstream of the throat to move in response to liner flexure for limiting solid matter accumulation adjacent the throat inlet.

Abstract: Apparatus for use in contacting a gas with a liquid comprises a pair of ported injector pipes onto which elastic sleeves having a series of slits therein are mounted by means of axially-spaced bands. The elastic sleeves expand as gas flows from the pipe to open the slits for discharging the gas into the liquid. The apparatus functions to maintain a desired gas flow rate irrespective of the accumulation of gas-liquid reaction products tending to block the slits.