Patent ID: 8177971
Filing Date: 2012-05-15
Classification: B01D

Abstract:
1. A filter assembly for removing material entrained in a fluid stream, comprising: a housing having a head part and a body part, and inlet and outlet ports for the fluid that is to be filtered, in which at least one of the ports is provided in the head part, the head part having a chamber port fluidly connected to the at least one port in the head part, the head and body parts having first formations which enable them to be connected to one another and separated by relative rotation; a filter element for removing material entrained in the fluid stream that can be received in the body part, the filter element having outwardly extending ribs which are slidingly received in corresponding grooves in the body part when the filter element is assembled into the body part, the engagement between the ribs and the grooves restricting relative rotation between the filter element and the body part and allowing the filter element to be separated from the body part by lifting it out axially, the filter element having a filter port, in which the assembly includes a compressible O-ring which is positioned between the filter port and the chamber port to provide a fluid tight connection between the filter port and the chamber port by sliding one of them into the other along a first axis; in which one of the head part and the filter element provides an inclined surface which is inclined relative to the first axis, and extends helically at least part way around the axis of the assembly, and the other provides an ejector part which acts against the said inclined surface so as to push the filter element away from the head part as the head part and the body part are separated by relative rotation, so as to free the filter port from the chamber port.