| 摘要 |
The metering pump is used for diluting liquid samples and for other similar functions, in apparatuses for analysis laboratories; it comprises a piston pump with a high flow rate 20, 22, 24 for the diluent or other product and a step piston 32 or similar pump with a lower flow rate 30, 32 - for the sample to be diluted; equipment 12 comprising the two pumps is oscillatory and the alternately movable parts of the pumps are controlled by the crank pin 28 of an angularly movable actuating member 5. <IMAGE>
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