Liquid purification or separation – Processes – Separating
Reexamination Certificate
2006-07-25
2006-07-25
Popovics, Robert James (Department: 1724)
Liquid purification or separation
Processes
Separating
C210S411000, C210S921000
Reexamination Certificate
active
07081207
ABSTRACT:
The invention relates to a method for cleaning a filter element (9) located in a filtering chamber (10, 11) and to a filter implementing the method. The filter includes an inlet (4) leading to the inlet side (10) of the filtering chamber, an outlet (6) starting from the outlet side (11) of the chamber, and a flow passage (13), which connects the chamber inlet side preferably to atmospheric pressure and by means of which a pressure difference can be generated between the different sides of the filter element in order to produce a flow impulse detaching solid matter accumulated on the element. In accordance with the invention, the inlet side (10) of the filtering chamber is connected in a first step to a confined buffer chamber (14) under lower pressure, the pressure equalisation between the chambers producing a flow impulse cleaning the filter element (9), after which the buffer chamber can be connected to atmospheric pressure. Such two-step pressure drop during cleaning of the filter element allows use of the elements in high-pressure hydraulic systems without exposing the element to risk of damage.
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Copy of corresponding International Application Published Under the PCT, International Publication Number WO 03/045528 A1, dated Jun. 5, 2003.
Kangasniemi Marko
Koivula Tuomo
Parker-Hannifin Corporation
Pophal Joseph J.
Popovics Robert James
Whitman Daniel J.
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