Abstract: Apparatus for washing parts such as mechanical parts using a cleaning solvent. A sink is provided to receive the dirty solvent which flows down a drain into a filter apparatus which includes a pair of concentric cylindrical containers positioned one inside the other and arranged to provide a circuitous path for washing solvent. Inside the inner cylindrical container is a bag which has the function of a filter element and also acts as a container for the dirt and other material filtered out of the solvent.

Abstract: Apparatus for washing parts such as mechanical parts using a cleaning solvent. A first holding tank containing washing solvent is pressurized causing solvent to flow to a wash area from the first holding tank, and the washing solvent from the washing area is drained into a settling tank arrangement. The settling tank arrangement is a plurality of concentric cylindrical containers positioned one inside another arranged to provide a circuitous path for washing solvent to flow through a series of particulate traps ultimately to a second holding tank. Continuous flow is obtained by providing means for depressurizing the first holding tank and pressurizing the second holding tank, thereby reversing the solvent flow through the system.