Dripless purification manifold and cartridge

DETAILED DESCRIPTION It is therefore a primary object of the invention to provide a cartridge based water purification and filtration system that prevents drainage from the supply and return lines upon removing a treatment cartridge.
It is a further object of the invention to provide a supply manifold containing shut off valves at one or both of provided supply and return ports.
It is a further object of the invention to provide a manifold having a stem valve at a supply port which cooperates with a surface at the treatment cartridge, such that with cartridge mounting and rotation or removal the valve retracts and extends to control supply flow.
It is a further object of the invention to provide a manifold having a projecting surface or bayonet fitting which contains a number of O'ring seals and which fitting mounts to a mating outlet recess at the cartridge which is backed by additional seals at the cartridge to prevent bypass migration of contaminants.
It is a further object of the invention to provide a manifold having channelways which interlock to flanged shoulders at the cartridge, upon rotation of the flanges into the channelways.
It is a further object of the invention to provide a cartridge container having an infeed flow cavity defined between a sealed external housing and internal liner whereby flow is directed to the bottom of the cartridge and thence through filtration and purification treatment media supported in the liner and to the outlet port.
Various of the foregoing objects, advantages and distinctions of the invention are obtained in a presently preferred system which provides a manifold having integral flow control valves at inlet and outlet ports.
The valves cooperate with a treatment cartridge to prevent drainage of liquid from the manifold supply lines during the changing of a treatment cartridge.
Extraneous shut-offs are thereby avoided at the primary supply system.
The manifold is molded to provide a central tubular out flow or "bayonet" fitting.
O'ring seals are fitted to the fitting to mate With a recessed port at the treatment cartridge to seal out flow from the cartridge