US 4,806,217 AGranted

Back-flushable filter and pressure-regulator particularly useful therewith

OwnerPeretz Rosenberginventor

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Abstract

A filter device comprises a central tube, a housing enclosing the central tube and defining an internal chamber therewith, and a filter body within the internal chamber. The central tube includes a plug between the inlet and outlet which directs the fluid to flow from the inlet through the filter body and out through the outlet. The housing and filter body are mounted for sliding movement axially of the central tube from a normal filtering position wherein the housing inlet communicates with the upstream side of the filter body, to a back-flushing position wherein the inlet communicates with the downstream side of at least a portion of the filter body. The housing may also include a valve member moved therewith under differential pressure between the housing inlet and outlet to regulate the pressure at the outlet.

Claims22

Dependent claims

A filter device comprising:

a central tube having an inlet end and an outlet end connectible into a fluid line for the fluid to be filtered;
a housing having an inlet end and an outlet end, enclosing said central tube and defining an internal chamber therewith;
and a filter body within said internal chamber;
said central tube including an inlet opening therethrough at the inlet end, an outlet opening therethrough at the outlet end, and a plug between said inlet and outlet openings directing the fluid to flow from said inlet opening through said filter body and out through said outlet opening;
said housing and filter body being mounted for sliding movement axially of said central tube from a normal filtering position wherein the central tube inlet opening communicates with the upstream side of the filter body, to a back-flushing position wherein the central tube inlet opening communicates with the downstream side of at least a portion of the filter body;
and wherein said housing is constructed to form a passageway at the outlet end of said housing permitting the outletting therethrough of the fluid when the housing has been moved to said back-flushing position.

3 more elements

A pressure-regulator device, comprising:

a central tube having an inlet end and an outlet end connectible into a fluid line whose pressure is to be regulated;
and a housing, having an inlet end and an outlet end, enclosing said central tube and defining an internal chamber therewith;
said central tube including an inlet opening therethrough at the inlet end, an outlet opening therethrough at the outlet end, and a plug between said inlet and outlet openings directing the fluid to flow from said inlet opening into said internal chamber and out through said outlet opening;
said housing being mounted for sliding movement axially of said central tube;
a valve member disposed within said housing and mounted for movment therewith toward and away from said inlet opening in the central tube to thereby restrict or enlarge said inlet opening;
said housing including surface areas exposed to the fluid pressure within the housing producing a differential pressure normally effective to move said housing in one direction with respect to said inlet opening in the central tube;
and a spring normally urging said housing and valve member carried thereby in the opposite direction with respect to said inlet opening in the central tube.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/105,072Filed 6 Oct 1987
Priority: IL 8034116 Oct 1986
Granted: 21 Feb 1989
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

B01D 29/114
With bag, cage, hose, tube, sleeve or like filtering elements: arranged for inward flow filtration
B01D 29/54
In parallel connection: arranged concentrically or coaxially
B01D 29/668
By flushing, e.g. counter-current air-bumps: with valves, e.g. rotating valves for coaxially placed filtering elements
B01D 29/682
With backwash arms, shoes or nozzles: with a rotary movement with respect to the filtering element