| 摘要 |
<p>The dispenser (1) has a main supply pipe (8) formed in a dispensing unit (6), and a dispensing or proportional valve (9) arranged along the supply pipe and including a shutter (14) that is operated by a double-acting hydraulic cylinder (10). A set of auxiliary pipes (11) is provided for bypassing a portion of liquid in the supply pipe via the cylinder. Two control- or regulating valves (12) i.e. bistable magnetic valves, control the liquid flowing along each auxiliary pipe. The dispensing unit has a non-return valve (28) arranged along the supply pipe and downstream to the proportional valve.</p> |
