Liquid purification or separation – Flow – fluid pressure or material level – responsive – Filter cleaning
Patent
1982-11-12
1984-09-04
Fisher, Richard V.
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Filter cleaning
210136, 210168, 2104165, 414694, 60454, B01D 3502, B01D 3522
Patent
active
044695942
ABSTRACT:
A hydraulically operated mining shovel comprises a stick which is pivotable in opposite directions by a pair of extendible/retractable double-acting hydraulic cylinders. A high-pressure hydraulic system is provided for operating and controlling the cylinders and comprises a fluid reservoir, a pump for supplying high-pressure hydraulic fluid, and a selector valve located between the pump and the cylinders and between the cylinders and the reservoir. A main filter, removable for cleaning, is located in a fluid return line leading to the reservoir. A self-cleaning filter assembly is connected in each fluid supply/return line connected between the selector valve and a hydraulic cylinder. Each filter assembly comprises a housing in which a pair of cone-shaped fine-mesh filters are connected in parallel with each other and in parallel with an adjustably one-way check valve. In operation, all of the pressurized fluid supplied from the selector valve through a filter assembly to its associated cylinder passes through the pair of filters, wherein any fluid contaminants are trapped, and none flows through the check valve. However, of the low-pressure back-flowing fluid returning from a cylinder through an associated filter assembly to the selector valve, the major portion (about 70 percent) passes through the one-way check valve, and the remainder passes through the pair of filters to prevent collapse of the filters and to back-flush any contaminants trapped therein back into the main filter for subsequent removal from the system.
REFERENCES:
patent: 844438 (1907-02-01), Bayley
patent: 4027595 (1977-06-01), Frank et al.
patent: 4322290 (1982-03-01), Carl
Fisher Richard V.
Harnischfeger Corporation
Millard Wanda L.
Nilles James E.
LandOfFree
High pressure hydraulic system and self-cleaning filter assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High pressure hydraulic system and self-cleaning filter assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High pressure hydraulic system and self-cleaning filter assembly will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1891122