| 摘要 |
<p>In an automatic aspirator-transfer valve controlling the delivery of washing fluid from a supply (M) to a cleaning gun (B) and having a valving piston (2) movable between a first or rinsing position, in which it opens bypass conduits (15) bypassing an injector (3,21,4) and a second or washing position in which it closes said bypass conduit (15) and enables the injector (3,21,4) to aspirate washing fluid from a reservoir (not shown) through a non-return valve (11), a side inlet (5) and a conduit (22) to its side inlet (21), the novel aspect is that the side inlet conduit (22) is separated from the space within the housing bore (20), in which the valving piston (2) can slide. …<??>In this manner it is avoided that a portion of the washing agent may fill the space within the housing bore (20) and leave the valve in the form of a "plug" when changing from the washing mode (Bottom Figure) to the rinsing mode , thus avoiding both the issuing of dangerously high concentrations and unnecessary waste of washing agent.</p> |
