| 摘要 |
<p>A system is disclosed for precisely metering and mixing fluids at variable mix rations, and for delivering the resulting fluid mixtures at the same substantially constant flow rates. The system comprises a mixing chamber; a first supply line for supplying a first fluid component to the mixing chamber via a first CFValve and a downstream first metering orifice; a second supply line for supplying a second fluid component to said mixing chamber via a second CFValve and a downstream second metering orifice, with the first and second fluid components being combined in the mixing chamber to produce a fluid mixture; and a discharge line leading from the mixing chamber and through which the fluid mixture is delivered to a dispensing vaJve. The discharge line, when the dispensing valve is open, having a maximum flow rate lower than the combined minimum flow rates of the first and second CFValves, thereby creating a fluid back pressure in the mixing chamber and in the first and second supply lines downstream of their respective first and second CFValves. The size of the first metering orifice is adjustable to change the flow rate of the first fluid component being fed to the mixing chamber, thereby changing the fluid back pressure in the mixing chamber and in the first supply line with an accompanying inverse change to the flow rate of the second fluid component being delivered through said second CFValve.</p> |
