| 摘要 |
A multiple flow selection valve connectable to a plurality of fluid sources, the valve having a fluid return port and a fluid working port and being operable to add or subtract the flow rates of the plurality of fluid sources to either the working port or the return port for the primary purpose of driving a constant volume motor connected to the working port and such that the total fluid flow rate through the valve is substantially constant. The device may be used to mix various fluids from different sources.
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