Liquid purification or separation – Flow – fluid pressure or material level – responsive – Maintaining stream pressure or flow
Reexamination Certificate
2007-02-06
2007-02-06
Popovics, Robert James (Department: 1724)
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Maintaining stream pressure or flow
C210S167150, C210S418000, C210S428000, C210S434000, C137S484200, C137S544000, C137S563000
Reexamination Certificate
active
10783969
ABSTRACT:
An arrangement and method for maintaining a minimum flow velocity in return piping receiving dirty coolant from a plurality of machine tools receiving filtered coolant from a filter apparatus. A bypass line diverts clean coolant into the return piping via a pressure reducing valve set to allow make up flow of clean coolant into the return piping just sufficient to maintain a pressure corresponding to the minimum flow velocity in the return piping. A pressure maintaining valve is interposed upstream of the pressure reducing valve and set to restrict flow as necessary to maintain adequate pressure to insure that the machine tools are adequately supplied with clean coolant at start up prior to the beginning of contaminated flow in the return piping.
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Benefiel John R.
Popovics Robert James
Woodruff T.
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