| 摘要 |
<p>A dosing device for filling liquid into containers comprises a filler body 1 and a metering device 2. The device 2 communicates with the interior of a rotary valve 7 through an end cover 9 of the valve housing 10, the valve 7 including a valve seat 11 and a check valve closure member 12 spring-biased towards the seat 11. The valve 7 includes three rotary ports 34, 34 min and 39 and two fixed ports 36 and 40. Downstream of the port 40 is an anti-drip suction-producing device 8 of a piston-and-cylinder form whereof the stroke of the piston 15 is adjustable. Upstream of the port 36 is a throttling valve 24 lowerable into an operative position downstream of inlet holes 21 from a liquid-containing tank. For a high viscosity liquid, it is drawn into the device 2 through the holes 21, the ports 36 and 34 and the end cover 9, the valve 7 is rotated to align the port 34 min with the port 40 and to close the port 36, and the liquid is then expelled from the device 2 through the end cover 9, the ports 34 min and 40 and an outlet nozzle 38. A low viscosity liquid is drawn into the device 2 through the holes 21, the lowered valve 24, the ports 36 and 34 and the end cover 9, and is then expelled from the device 2 through the end cover 9, the valve 11, 12, the ports 39 and 40 and the nozzle 38.</p> |
