Liquid purification or separation – With repair or assembling means – Placement of container opens flow controller
Patent
1995-05-25
1997-01-07
Lithgow, Thomas M.
Liquid purification or separation
With repair or assembling means
Placement of container opens flow controller
210282, 2511494, 2511496, B01D 35153, B01D 2710
Patent
active
055913326
ABSTRACT:
Embodiments of a fluid filtering assembly are shown and described, each embodiment including a valve head that routes fluid to and from a filter cartridge and that includes a valve system that automatically opens and closes when the filter cartridge is inserted and removed, respectively. The valve system preferably includes a generally-cylindrical piston with a hollow interior space, which receives a stem member. The stem member has a bottom-end seat or sealing member and has a central body shape that allows fluid to flow up through the piston interior space, either through or up around the stem member. Upon removal of the filter cartridge, the piston is biased to move down into an "off" position, to close both the inlet and outlet fluid passages. In this "off" position, the piston exterior surface blocks off radial fluid inlets and the piston interior surface seals with the stem bottom end seat to prevent fluid backflow out of the piston interior space. The filter cartridge preferably includes a neck with a centrally-located, vertical fluid outlet hole surrounded by a ring of vertical fluid inlet holes near the outer perimeter edge of the neck.
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Christiansen Lance J.
Reid Roger P.
Lithgow Thomas M.
Omnipure Filter Co.
Pedersen Barb S.
Pedersen Ken J.
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