| 摘要 |
<p>In a washing apparatus for alternately effecting washing at low pressure and high pressure jet cleaning and having a jet nozzle and an injector for supply of a washing agent to the washing fluid during the washing periods, a first conduit by-passing the injector and provided with means adapted to control the passage through said by-pass conduit in response to variations in the pressure downstream of said injector. Said downstream pressure being variable by means of manually operable valve means fitted close by the jet nozzle of the apparatus.</p> |
