Liquid filter assembly; and methods
AssigneeDonaldson Company, Inc.
InventorsAngelo Schiavon, Mauro Cantoni, Andrey Zanettin, Claudio Formica
Life of this patent
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Abstract
A liquid filter assembly is provided. The preferred assembly includes a serviceable filter cartridge having a primary filter section and a secondary or bypass filter section. The preferred assembly includes a bypass valve arrangement and a suction filter arrangement. The suction filter arrangement preferably includes a dimensionally biased valve arrangement, preferably one which is devoid of a helical coiled spring, to control flow through the suction filter. A flow/pressure regulation valve, to allow flow from an interior of the assembly to a reservoir if needed, is preferably provided. Preferred serviceable filter cartridges are shown.
Claims18
A liquid filter assembly comprising:
- (a) a housing defining an interior and having:
- a liquid flow inlet arrangement;
- a first circulation loop liquid flow outlet arrangement;
- and, a tank reservoir liquid flow inlet/outlet;
- and,
- (b) a suction filter assembly secured to the housing of the liquid filter assembly and positioned in a liquid flow communication with the reservoir liquid flow inlet/outlet;
- the suction filter assembly including:
- (i) an extension of suction filter media surrounding and defining a suction filter media central volume;
- and,
- (ii) a first, non-helical spring, directionally biased valve arrangement comprising a ring shaped valve member having at least one cut valve therein positioned and configured to:
- (A) readily permit liquid flow from a tank reservoir through the suction filter media and into the housing interior;
- and,
- (B) to resist liquid flow from the housing interior, through the suction filter media and then into the tank reservoir.
Dependencies are inferred from the claim text.