| 摘要 |
A volumetric liquid metering device comprising a meter chamber (50) for receiving up to and including a predetermined volume of, liquid, an inlet conduit (46) for directing liquid into the meter chamber, a volumetric metering means (58) to indicate when the predetermined volume of liquid has entered the meter chamber, and a discharge conduit (64) for discharging liquid from the meter chamber in response to a signal from the volumetric metering means. It is preferable that the device comprise a pair of coupled meter chambers, wherein one meter chamber is arranged to be filled with liquid whilst the other discharges liquid therefrom. Valves are provided to control ingress and egress of liquid from the meter chambers, which alternate between chambers in response to a signal from the volumetric metering means.
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