Pall Corporation

Richard Guy Gutman

Roger A Buttery

Kenneth Roy Weight

Michael Ernest Grimes

Karl S Smith

Nigel J Cook

George Brandwood Peacock

Nicholas Lloyd Yoward

John A Tolcher

A filter assembly comprises a filter () defining path for fluid passing to or from the filter (). An adaptor () is connected to the filter () and provides a continuation of the path. The adaptor () is for mounting the filter () on a mounting plate () and carries one or more sealing rings () that are engageable with the mounting plate (). The adaptor () is made from a plastics material and one surface of the adaptor () is reinforced by contact with an annular reinforcing member () which may be of metal, particularly steel. This allows the flow path provided by the adaptor () to be maximized.

Filter assemblies

A filter assembly may include a valve which includes a valve member. The valve member moves between a first position and a second position and the valve is opened and closed.

Filter assemblies with valves

End cap for a cylindrical filter

A filter assembly has a housing accommodating a filter element. One end cap of the filter element has a generally annular body with support fins projecting from one surface. A peripheral flange extends from the edge of the body and is spaced from the outer ends of the fins to allow differential expansion of the flange without undue stress. The flange carries two opposed sets of pegs for supporting respective sealing rings to allow the flange to seal between parts of the housing.

Filter assemblies and end caps for filter assemblies

A porous filter medium is formed by a pleated cylinder of a depth filter medium. An absolute rated inner filtration layer is arranged between upstream and downstream drainage layers. The depth filter medium is formed from a continuous sleeve. Additionally or alternatively at least the downstream drainage layer may be formed integrally with at least a part of an inner filtration layer. The material of the medium may be a fibrous mass of non-woven synthetic polymeric micro-fibres which are free of fibre-to-fibre bonding and are secured to each other by mechanical entanglement or intertwining, with the diameter of the fibrous structure varying across the medium.

Depth filter media

A filter unit comprises a plastics frame into which a sheet of filter medium is insert moulded. Portions of the frame form apertures and other portions allow fluid access to and from the opposed surfaces of the filter medium when the frame is covered by a flat surface. The frames also form portions of an integral capsule enclosing the medium. A number of such filter units can be stacked together in various configurations so that the apertures form inlets and outlets for fluid so that, in some configurations, fluid can be passed through the filter units in parallel while, in other configurations, fluid can be passed through filter units in succession. Filters of any convenient size can be produced by increasing the number of filter units in a stack. The filters are bi-directional. The frames can be of polypropylene connected to hydrophilic microporous nylon membrane by injection moulding, which has been found to give a filter unit that can be integrity tested.

Plastic frame filter unit for a stack assembly

A porous filter medium is formed by a pleated cylinder of a depth filter medium. An absolute rated inner filtration layer is arranged between upstream and downstream drainage layers. The depth filter medium is formed from a continuous sleeve. Additionally or alternatively at least the downstream drainage layer may be formed integrally with at least a part of an inner filtration layer. The material of the medium may be a fibrous mass of non-woven synthetic polymeric micro-fibers which are free of fiber-to-fiber bonding and are secured to each other by mechanical entanglement or intertwining, with the diameter of the fibrous structure varying across the medium.

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Chichester, United Kingdom

Richard Guy Gutman