Abstract: A machine manifold or body having fluid passages defined by relatively thin stainless-steel or other corrosion resistant tubular components embedded within a relatively thick molded plastics casing which serves to give the components strength to withstand the fluid pressures in the passages, and to permit a minimum of the expensive corrosion resistant material to be used. The passages may be formed by different tubular components located and preferably sealed together, or could be constituted by a single lost-wax casting of stainless-steel. Conveniently there is a rubbery layer between the thin metal passage defining components and the surrounding molded plastics casing.

Abstract: This invention is a method of making a fluid pump or an engine in which passages for the working fluid are defined by metal sleeves which are held together by being entirely embedded in a surrounding casing of an epoxy resin containing glass spheres as a filler to give dimensional stability and strength.