Filter array with connector for successive backwash

Details Filter array with connector for successive backwash Filter array with connector for successive backwash

1998-10-15

2001-03-06

Walker, W. L. (Department: 1723)

Liquid purification or separation

With repair or assembling means

C210S333100, C210S340000, C210S426000, C210S427000, C137S625110

Reexamination Certificate

active

06197192

ABSTRACT:

TECHNICAL FIELD
This invention relates to filtration apparatus and in particular, but not exclusively, to apparatus for filtering high volumes of liquids such as water.
BACKGROUND OF THE INVENTION
As the cleanliness of water in supplies for drinking and manufacturing and in installations such as air-conditioning apparatus, become more and more important, a need has developed for a compact, easily serviceable filter apparatus. Further currently there is no satisfactory backwashable filter that can readily be used in remote locations where there is no power supply. At least some embodiments of the present invention mitigate these various problems.
SUMMARY OF THE INVENTION
From one aspect there is provided filtration apparatus comprising an array of filters arranged in parallel and having respective inlets and outlets, a backwash outlet, a connector for successively connecting the filter inlets to the backwash outlet and means for moving the connector from inlet to inlet in a cycle characterised in that the moving means carries a valve element for closing the backwash outlet and that the moving means physically unseats the valve element at the start of the cycle and allows it reseat at the end of the cycle.
The valve element may be mounted in a cage and carried around with the moving means as it moves the connector from inlet to inlet. In this case the valve element, which is preferably a ball, is unseated at the start of the cycle by camming against a camming surface.


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