Abstract: A three fluid heat exchanger in which first (fuel) and second (oil) fluids are in a normally flowing heat transfer relation, with flow of a third fluid (compressor bleed air) being dependent on a changing condition of one of the first or second fluids. Tubular heat exchanger cores are comprised in a unitary body with one being perpendicular to the other for space conservation and to simplify fluid flow patterns. The described one core is in the path of flow of one of the first or second fluids and provides a flow path for the third fluid. A valve influenced by a changing pressure condition of one of the first and second fluids controls flow of the third fluid.

Abstract: A three fluid heat exchanger in which first and second fluids are in a normally flowing heat transfer relation, with flow of a third fluid being dependent on a changing condition of one of the first or second fluids. Tubular heat exchanger cores are comprised in a unitary body with one being perpendicular to the other for space conservation and to simplify fluid flow patterns. The described one core is in the path of flow of one of the first or second fluids and provides a flow path for the third fluid. A valve influenced by a changing condition of one of the first and second fluids controls flow of the third fluid.

Abstract: A tube and shell heat exchanger having compact, high performance characteristics in which the core unit comprising tube assembly, headers and baffles is removably installed in a shell and has a cushioned mounting therein. A use of resilient O-rings on the headers is contemplated as well as a use of flexible, resilient baffles, one of which wraps the core unit and acts as a seal by-pass member.

Abstract: A unitary plate type heat exchanger structure in which stacked core sheets, tube sheets, continuous frame members, nose pieces and corrugated fin material are joined together as by brazing to form a one-piece construction with integrated flow passages for at least one of the fluids. The parts combine with one another in a manner facilitating assembly and obviating separate attachment of a manifold means. Interior parts, including nose pieces, frame members and tube sheets are structured inherently to provide flow passages for a confined fluid. In the brazing process the parts are interconnected in a manner to resist deformation and separation of formed joints, and, means are installed to obviate the effects of high internal pressure, particularly at confined fluid inlet and outlet locations.