Abstract: A plating preparation method in which a nickel part is placed in an electrolyte bath of such acid concentration and such temperature as to promote thorough etching of the part surface and in which an etched part is allowed to soak in the same electrolyte bath for a period of time sufficient to dissolve formed metallic oxides. A coating of a base material is applied to the part following removal from the etching bath, the base material achieving a close intimate contact with the part surface and penetrating and interlocking with recessed areas of such surface.

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 mixing valve wherein a body provides plural inlets and a common outlet, with a valve settable to control flow from the inlet to a mixing chamber communicating with the outlet. A fluid pressure operated piston means adjusts the valve in its control positions. A temperature responsive device orients in the path of flow from the outlet and effectively controls the positioning of the piston means.

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.

Abstract: A fixture for holding parts to be joined together in which a frame-like structure provides a seating surface for an assembly of parts. A cam acting lever is adjustable to exert single point pressure, and means comprised in the structure transmits such single point pressure to multiple pressure points applied uniformly in a seating or clamping of the assembly of parts to the seating surface. In the illustrative embodiment a plurality of pressure applying members is in an approximate linear orientation and functions best in connection with an assembly of parts presenting a flat pressure receiving surface.

Abstract: A method including the step of applying braze alloy in sheet-like form to a part made of a brazeable parent metal. Pressure is exerted to place the braze alloy in intimately contacting relation to the part. For a predetermined period of time, while the exerted pressure is maintained, heat is applied at a temperature value which is just below the melting point of the braze alloy. Diffusion bonding occurs and, in accordance with an optional practice of the invention, a catalyst may be introduced which at a temperature below the applied temperature liquifies and speeds up the diffusion process.

Abstract: A means for mounting a diaphragm in an accumulator-reservoir device or the like in which the gland receiving the diaphgram bead has faces formed to oppose such pull on the bead as will break the sealing contact between gland faces and the bead. Back draft angles and grooved surfaces are used in conjunction with an initial applied compression to fix the bead in place in the gland.

Abstract: A heat transfer system in which a fluid of substantial heat absorption qualities is caused to flow in successive heat absorption and heat dissipation phases, a latter having one or more differential modes. In the disclosed embodiment of the system, a cold plate-liquid boiler assembly provides flow paths for the successive phases, the differential heat dissipation modes being provided by the liquid boiler and by external cooling means alternatively included in a heat rejection circuit. Vent control apparatus associated with the liquid boiler tends to maintain a pressure therein conducive of boiling at selected temperature values.

Abstract: A fixture for holding parts to be joined together featuring clustered arrangements of pressure applying members. An interconnected yet independent mounting of individual pressure applying members enables a distributed pressure to be applied over a contacted area of a work surface, irrespective of whether such area is flat or curved. Single point pressure is applied uniformly to multiple pressure points. In an illustrated embodiment, clusters of pressure applying members are suspended within a generally C-shaped fixture which includes a cam lever manipulative to apply and to release pressure effects.