Abstract: A pressure relief by-pass control valve in a system flowing fluid of changing temperature. The vale incorporates a signalling mechanism to indicate when differential pressures have put the valve in a by-passing mode, including an indicator button displaceable by a valve member in moving toward an open position. Temperature responsive structure closes and opens a gap in the connection between the valve member and the indicator button. As used with a heat exchanger, the valve signals the fact of a clogged heat exchanger core, while obviating giving of a false signal when high pressure differentials resulting from low temperature operating conditions occur.

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: An accumulator-reservoir device in a liquid cooling system utilizes a piston and metallic bellows to separate system pressures that are high and low in relation to one another. A piston position indicator is used sensing less than the full piston stroke in a manner to yield an accurate quantity measurement without undue elongation of parts.

Abstract: An improvement in a machine tool or the like in which a work piece is held in a collet driven in a rotary sense and subject also to axial movements in which the work piece is gripped and released. A collet operating mechanism includes a frictionless air bearing allowing endwise movements and high speed rotation.

Abstract: A pivotally adjustable valve disc has a ring seal set in its grooved periphery for contact with a wall of a valve accomodating bore. A flexible, radially expansible member is in the valve groove in a backing relation to the ring seal. Passages admit pressure fluid from the upstream side of the valve disc to the valve groove where the applied pressure is exerted through the radially expansible member toward a radial expansion of the ring seal. In its pressured contact with the seal, the radially expansible member blocks pressure fluid escape through gaps and interfacial joints therein.

Abstract: A heat exchanger core of the plate and fin type having intrinsic capabilities of controlled resistance to heat flow. Objectives are achieved without a need for special materials and without departing from practiced structural and fabrication standards. A concept of resistance layers is used, with heat flux being controlled primarily in the resistance layers.

Abstract: A plate and fin type heat exchanger in which different flowing fluids are placed in a segregated heat transfer relation and in which provision is made to deny opportunity for a leaked fluid from one flow or circuit to join or mix with fluid of another flow or circuit. A concept of vented buffer zones is used to protect against leakage through plate elements and through defined joints between plate and spacer elements. The concept allows and provides for relatively simple manifolding and for fabrication to conventional configurations using for the most part standard easily manufactured parts.

Abstract: A heat exchanger of the tube and shell type comprising a shell and a shell enclosed tubular core, the core being removable from the shell for inspection and servicing. Motion of the core relative to the shell, and motion of core components relative to one another, is precluded without loss of core access and removability. In one disclosed form of the invention, abutments, at least one of which is part of a detachable closure, limit endwise core motion as well as a relative separating motion of headers which, together with interconnecting tubes, make up a core assembly. At the same time a rigid interponent element limits a relative approaching motion of the headers. In another disclosed form of the invention, headers have a screw threaded connection to parts of the enclosing shell.

Abstract: A valve assembly in which a longitudinally shiftable shuttle or spool valve is positioned by varying the fluid pressure in a pressure chamber at one end thereof. Solenoid valves open and close in a pulsed response to a changing fluid condition, the flow of which fluid is regulated by the spool valve. The solenoid valves control the admission of a pressure fluid to the pressure chamber and its exhaust therefrom.

Abstract: In a liquid coolant circulating or like system an accumulator--reservoir device of the bootstrap type. The reservoir device has a sliding seal construction, in which a piston is subject to high and low pressure influences as these relate to discharge and intake sides of a liquid circulating pump. External leakage from the device is minimized by an arrangement avoiding the need to seal against high pressure loss direct to ambient. Overall length is reduced by the arrangement which places a high pressure chamber between low pressure chambers. A hollow piston construction permits packaging system components within the reservoir, introducing further opportunity for simplicity and compactness of design.

Abstract: A method of mechanically joining tubes to headers in tubular heat exchangers of a high density, high performance type. The headers are made of a heat recoverable metallic material and worked while in a martensitic state to be subsequently shrunk upon installed tubes. Procedural steps are carried out with particular regard to a header construction characterized by a multiplicity of closely spaced apart tube accommodating holes separated by relatively narrow ligaments in which working stresses are to be absorbed.

Abstract: For use in a milling or like machine, a fixture is provided to hold a part to be machined, the fixture including portions to clamp the part against relative shifting motion. A mount for the fixture includes components movable in tilting and vertical senses whereby a previously machined surface on a held part may be brought into mating contact with a reference surface in the machine thereby locating the part for a succeeding machine operation. A single means is operable to lock the components in a set position of adjustment. The part is firmly held in an unstressed condition for precise performance of the succeeding machine operation thereon.

Abstract: A method of making leak-tight tube joints, in a non-brazed tubular heat exchanger or the like, including the steps of expanding tube ends out into mechanical contact with a header plate in which they are received, and, in conjunction with this step, introducing a sealant into tube joints. According to one invention aspect, the sealant has the form of a relatively ductile elastomeric or metallic material and is introduced into a joint as a coating on a tube end. In another invention aspect, the sealant has the form of an anaerobic adhesive and is introduced into the joint as a liquid by a capillary action for subsequent curing in the hidden crevices and voids of the joint.

Abstract: A holding fixture for use in the brazing of heat exchangers applying multiple holding pressures, two of which are in senses opposed to one another. Cage members mount a heat exchanger between them and are biased in a separating sense. At the same time they incorporate apparatus to apply a clamping pressure essentially within respective cage members. Fixture mechanism includes a detachable part useful as a reactant member in application of the clamping pressure and as a dynamic retainer in applying a pressure in conjunction with a separating motion of the cage members. The invention has method aspects related to brazing in the presence of multiple applied pressures.

Abstract: A device in a fluid flow path moves to perform a fluid flow control operation at a predetermined high fluid temperature. A mechanism normally locked out of participation in the movements of the device is released at a selected fluid temperature higher than the predetermined fluid temperature and compells the device to a performance of the control operation. The thermostatic device and the locking and release mechanism are incorporated in a unitary structure insuring the carrying out of a control function even when elements of the device having primary responsibility therefor fail or respond inadequately.

Abstract: A method of making leak-tight tube joints, in a non-brazed tubular heat exchanger or the like, including the steps of expanding tube ends out into mechanical contact with a header plate in which they are received, and, in conjunction with this step, introducing a sealant into tube joints. According to one invention aspect, the sealant has the form of a relatively ductile elastomeric or metallic material and is introduced into a joint as a coating on a tube end. In another invention aspect, the sealant has the form of an anaerobic adhesive and is introduced into the joint as a liquid by a capillary action for subsequent curing in the hidden crevices and voids of the joint.

Abstract: Apparatus in generally unitary machine form for the mechanical, automatic installation of tubes in an assembly of header plates and baffles to produce a tubular heat exchanger core or the like. Tubes are inserted one at a time in perforate parts held in a holding fixture with a mounting table and the holding fixture being capable of movement in different senses. A tube delivery arrangement features a tube support which can be rocked into and out of a support position. A guide rod is compelled to a rotary motion in its entrance into and alignment of the perforate parts.

Abstract: A fluid circulating system including a pump and an accumulator-reservoir device of the bootstrap type in which operation of the pump energizes the device to maintain a pressurized system despite an increasing fluid density caused by lowering fluid temperatures. A light spring force is applied which establishes a minimal system pressure effective even when the pump is shut off and which maintains in its proper convolution a rolling diaphragm comprised in the accumulator-reservoir device.

Abstract: A heat exchanger of the plate and fin type which due to the presence of interacting parts is inherently self fixturing in assembly, obviating a need for a holding fixture in assembly and preparatory to and during brazing. The heat exchanger features use of a plate element formed to restrict relative motion of underlying and overlying parts and universally usable in a heat exchanger core stacking process.

Abstract: A cartridge valve in which parts made separable for convenience of manufacture and for a use of different materials within the same assembly are interconnected for unitary installation and removal.