| 摘要 |
Device for the volumetric metering of liquid, viscous, or pasty products comprising a pipe 12 for supplying product to a chamber 14 containing a piston 24 which can move with a reciprocating movement so as to suck up a dose of product into the chamber and expel it via its outlet orifice 18, the piston 24 comprising a channel 28 for the passage of product, one end of which channel opens out at the end of the piston pointing towards the outlet orifice 18 and the other end of which opens out onto the peripheral surface of the piston, the latter being mounted so as to rotate about its longitudinal axis so as to set up and interrupt a communication between the pipe 12 for supplying the product, and the channel 28. <IMAGE>
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