Radial and axial flow stage filter device

A filter device comprising, a container having a first end wall and a second end wall spaced and joined by a peripheral wall to enclose a cavity, opening means in said container for fluid inlet means and fluid outlet means, a filter unit supported in said cavity, a radial flow first stage subassembly in said filter unit communicating with said fluid inlet means and disposed for radially inward fluid flow, and an axial flow second stage subassembly in said filter unit disposed centrally within said radial flow first stage subassembly in fluid communication with said radial flow first stage subassembly and said fluid outlet means, thereby providing series fluid flow sequentially through said radial flow first stage subassembly and said axial flow second stage subassembly of said filter unit, said radial flow first stage subassembly having a central axial passage receiving said axial flow second stage subassembly, said axial flow second stage subassembly having a hollow outer shell having slot means therein for fluid flow from said central axial passage of said radial flow first stage subassembly into said axial flow second stage subassembly, and said hollow outer shell of said axial flow second stage subassembly having seal means at the longitudinal extremities engaging said radial flow first stage subassembly for maintaining separation of fluids therein except for fluid flow through said slot means.