Liquid purifying system

Claim 1

In combination with a dry-cleaning machine having a cleaning section and storage means for liquid cleaning solvent, means for purifying said solvent comprising a closed vessel having a liquid inlet and a liquid outlet, filter means in said vessel arranged between said inlet and outlet so that liquid entering said vessel through said inlet and discharging through said outlet passes through said filter means and is thereby filtered, means for establishing in said vessel a liquid level leaving a vapor space above said level, means in said vessel for evaporating liquid in said vessel, condensing means connected with said vapor space for condensing vapor produced by said evaporating means, pump means for pumping said liquid cleaning solvent, said pump means having an inlet connection to said storage means and having an outlet, conduit means connecting said dry cleaning machine, closed vessel and condensing means including first conduit means connecting said outlet of said vessel with said cleaning section of said dry cleaning machine, second conduit means connecting said condensing means to said storage means, third conduit means connecting the outlet of said pump to said inlet of said vessel and fourth conduit means connecting the outlet of said pump thru said liquid level establishing means to said vessel and valve means in said conduit means for selectively circulating said liquid solvent from said storage means through said filter means in said vessel to filter said solvent as one selection and for supplying said liquid solvent to said vessel under control of said liquid level establishing means for distillation of said solvent as one selection, said second conduit means returning the resulting condensate from said condensing means to said storage means.