Return line filters

Return line filters provide an additional filtration stage for the hydraulic fluid. They are typically integrated in the return line between the end of the longwall face and the tank unit. They comprise two individual filter elements and a manual valve. This arrangement allows to utilize the individual filter elements separately. It offers the advantage of not having to interrupt the hydraulic circuit when replacing a contaminated element. If, e.g. the first element needs replacing the return flow can be routed through the second element without any losses.