Multiple filter device in a fluid system with a fluid - reservoir

摘要

Housing within the reservoir has a cylindrical filter chamber with an inlet and outlet and an upper opening registering witn the filter chamber. The filter assembly is carried by the housing and includes a cylindrical filter element connected to the inlet, which is located below the fluid level in the reservoir. A cover is secured to the reservoir top wall to close the reservoir opening and has a detachable device to close the upper end of the filter. The first filter element contains a second which can be moved across the lower end of the first element to filter fluid run into the reservoir without interfering with the fluid flow from it, the second filter being constructed and arranged to collect foreign matter dislodged from the first filter during backwash.