Abstract: A disc-type filter, having a filter housing and contained therein a stack of slightly spaced apart axially moveable annular filter plates slidably interconnected to each immediate adjacent plate by three symmetrically and uniformly placed two-headed rivets which provide a predetermined and uniform spacing between the plates when the plates are moved apart for cleaning by reverse flushing. An actuation rod allows selective enlargement of the spaces between the plates, and holds the plates in their spaced apart cleaning position. The stack of plates is held in axial alignment immediately over an input port by guide bars which slidable engage the periphery of the plates. The plates and filter are constructed to permit use of one plate in any position in the stack, and the plates have an annular flange to divert fluid flow to improve cleaning and provide a pre-filtering for larger particulate matter.

Abstract: A pipe joint and method of making a pipe joint are disclosed, the pipe joint being suitable for formation on a pipe fitting and a pipe and comprising an enlarged annular socket, a first lip projecting toward the open end of the socket cooperating with a second lip formed on an annular retaining ring to hold an annular seal ring therebetween, the retaining ring being locked in place by deforming the outer end of the pipe member radially inwardly.