Method and a device for the cleaning of a piston-based hydraulic accumulator

Abstract

The invention relates to a method of using new flushing ports (A,B) when cleaning a piston accumulator (). Dirty hydraulic oil is returned out via the main port () and a return passage () until a cleanness grade has been reached. Clean hydraulic oil is forced into the piston accumulator () via the axial bores (A, B) of the flushing ports (A, B) and further in sloping bores (C, D), bringing the hydraulic oil into the volume () in an upward, tangential direction below the piston (), into a flushing circulation. By reducing the gas pressure on the gas side () of the piston () in relation to flushing pressure input from a valve (), a volume () is created on the oil side between the piston () and the end bottom (). The return passage () is closed and the piston () is brought into its upper position, so that an internal cylinder wall () is cleaned. Upon pressure build-up, the return passage () is opened, and the piston () returns to its end position on the oil side while the supply of clean hydraulic oil is maintained, and the operation is repeated until a clean-ness grade has been achieved.