Cleaning lance has two adjacent barrels with a mesh and sliding valve member

摘要

A cleaning lance is provided in which water from an inlet (1) is directed either to an upper, rinsing barrel (5) or to a lower, foamer barrel (12) and a coupling (8) is arranged to support a detergent container (9) below both barrels. Foamer barrel (12) is provided with a mixing chamber (19) having an inlet for detergent supplied via a flow control valve (2). A water jet injected into the mixing chamber via a Venturi nozzle (3) draws in and mixes with the detergent and the resulting mixture is ejected by a further Venturi nozzle (4) and draws in air from an exterior air inlet (20) to form a jet of cleaning foam. A mesh (13) is located in second barrel (12) downstream of mixing chamber (19) for foam the mixture. First and second barrels (5, 12) are coupled by latching valve means (15) to a common water inlet (10. Valve means (15) has a default position in which valve means (15) selectively couples first barrel (5) to water inlet (1) and is operable by a user on reducing water pressure at the water inlet. Valve means (15) comprises a rolling or sliding valve member (14) which is moveable to selectively block one of a lower inlet (18) to second barrel (12) and an upper inlet (17) to first barrel (5). Valve means (15) defines a curved path for sliding valve member (14) as it moves in use between its selective blocking positions.