| http://www.w3.org/ns/prov#value | - The valves 29 and 35 are of similar construction but are arranged to act in reverse order, that is, when the valve 29 is opened to allow iiow from the separating chamber II into the metering chamber I2, the valve 35 is closed so as to collect a predetermined quantity of liquid in the chamber I2, for example a standard unit or units of volume, such as a barrel; then when the given amount of liquid
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