| 摘要 |
A proportional mixing unit for accurately metering the desired amounts of a liquid concentrate and a liquid diluent, completely mixing the concentrate and diluent together, and holding the mixture until needed. A constant volume pump is used to pump a constant volume of the liquid concentrate. A pressure regulator maintains the liquid diluent at a constant pressure. A variable volume pump is used to mix the liquid concentrate from the constant volume pump and the liquid diluent from the pressure regulator and to pump a variable volume of the mixture to a holding tank. By varying the volume of the variable volume pump, the proportion of liqiuid concentrate to liquid diluent is accurately varied.
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