Abstract: Adiabatic positive displacement gas cycle machinery is designed with explicit control of the heat flow between the gas and the walls. The control is achieved by maintaining near-laminar flow and a small wall area to volume ratio. The most stable near-laminar flow in a cylinder is an axial vortex because of symmetry, and hence the induction port design should establish an axial vortex and a low velocity. Induction and exhaust port designs to achieve this flow are applied to a vane pump, an adiabatic air compressor, a diesel engine, and two and four stroke Otto cycle engines. The gain in thermal efficiency for these designs can be significant, up to a factor of 2, since the largest inefficiency in nearly all positive displacement machinery is imperfect control of heat flow.

Abstract: A vehicle hydraulic fluid system includes an engine driven pump which excites the fluid in the system downstream of the pump by imparting pressure pulses thereto at frequencies which vary as the speed of the engine, and hence, the pump varies. For the purpose of inhibiting the transmission of these pulses through the system and thereby lessening noise caused by the radiation of the pulses by components in the system, a cross loop attenuator is coupled in the system adjacent the pump outlet. The attenuator comprises a simple hose or tube having its opposite ends coupled to opposite sides of a cross fitting having its other two sides coupled in a line leading from the pump outlet.

Abstract: A fuel feed pump arrangement which includes a housing serving for accommodating both an electric motor and a feed pump system coupled to the electric motor. A diaphragm is provided in the housing with the diaphragm maintaining a system pressure for a predetermined period of time after the drive motor of the pump system has been turned off.

Abstract: Fluid control apparatus including inlet and outlet check valve assemblies connected to a mounting block, filter means operatively associated with the check valve assemblies and a pulse damper device positioned on the mounting block for maintaining a continuous pressure on fluid after it has passed through the check valve assemblies.

Abstract: A pump for pumping an incompressible liquid comprising a housing having an inlet and an outlet, a pumping chamber in said housing, and a positive displacement pumping member mounted for movement in the pumping chamber. The housing has an inlet passage which leads from the inlet to the pumping chamber and an outlet passage leading from the pumping chamber to the outlet. Inlet and outlet check valves are provided in the inlet and outlet passages, respectively. A resiliently expandable chamber opens into the inlet passage upstream of the inlet check valve to receive the liquid and to be resiliently expanded by it.

Abstract: A construction for an air dome is provided wherein the entrance area is substantially blocked off except for peripheral ports. It has been found that in fuel pumps, particularly where the fuel inlet port is below the air dome, that the flow of fuel into the dome can sometimes be at such a velocity that it washes out much of the air trapped within the dome and therefore defeats the air dome purpose. It has been found that the provision of a solid disk at the entrance to the air dome prevents such air washout, fuel entry being considerably restricted and confined to points at the disk edge. In particular, the use of such a disk in conjunction with an air dome of the type having longitudinal ridges, i.e., side flutes which normally are provided for the purpose of effecting fuel passage around the outside of the air dome, is used advantageously. Thus, fuel entry into the air dome to compress air therein is not washed out and the air dome remains effective.

Abstract: A method and apparatus are proposed for the simultaneous damping of noise on the intake and pressure sides of fluid pumps, particularly fuel supply pumps. The method comprises the diverting of peaks of variation in the supply medium from the intake and pressure sides and then bringing them together, in a common region, into operative contact under the control of a diaphragm. The peaks of variation are furthermore adjusted in such a manner, by means of the length of the connection lines surrounding them, for example, that a phase displacement of 180.degree. is produced in the variations for the purpose of mutual compensation of the pressure variations on both sides which cause the generation of noise.

Abstract: An air compressor assembly is provided having a high pressure air receiver, a compressor, an outlet port and an inlet port on said compressor, said inlet port having a normally closed spring loaded inlet valve, the improvement comprising a two position normally open spring loaded poppet valve on said compressor, oil pressure actuator means acting on said poppet valve opposite said spring, receiving pressure oil from a pressure lubricating system in said compressor to close said poppet valve against the spring in normal operation of the compressor, a pulsation damper having upper and lower chambers connected by a metering means between the compressor and air receiver, a connection from the compressor to the lower chamber delivering high pressure air thereto, a connection from the lower chamber to the air receiver, a connection from the upper chamber to the poppet valve on the same side as the spring, a pressure responsive actuator means selectively acting on the inlet valve, and a connection from the poppet va

Abstract: One or a plurality of positive displacement slurry pumps are connected to common intake and discharge manifolds at a typical slurry pipeline pumping station. Each pump is connected at its inlet by inlet piping from the intake manifold through an intake isolation valve with a flushing water inlet between the intake isolation valve and the pump. Similarly, each pump is connected at its outlet by outlet piping to the outlet manifold through an outlet isolation valve with a pump drain between the outlet isolation valve and the pump. Conventional pulsation dampeners are connected to the piping at least at the pump outlet and communicate a volume of gas under pressure to the pump for dampening of shock waves. The inlet and outlet piping has a pipe length and slope between the pump on the high side to the station intake manifold and to the discharge manifold on the low side.

Abstract: A reciprocating fuel pump for an internal combustion engine comprising a body having an outer wall defining a pumping chamber and a pair of generally cylindrical projections in fluid communication with the pumping chamber, the projections defining an intake cavity with an intake check valve therein and a discharge cavity with a discharge check valve therein. Elastomeric tubular conduits within the projections form the intake and discharge cavities and are of a flexibility sufficient to provide a collapsing and an expansion of the conduit walls upon relatively small pressure variations resulting from the suction and discharge strokes of the diaphragm. The elastomeric conduits thereby provide pulsating chambers to smooth out the flow of fuel and thereby increase the fuel flow through the fuel pump.

Abstract: A reciprocating type pump has a pair of body members with complementary concave and convex surfaces which clamp a flexible sheet means therebetween to hold the same in curved configuration. The member having the convex surface has a pump chamber opening toward the flexible sheet means and the concave member has inlet and outlet passages opening toward the flexible sheet. The flexible sheet has portions overlying such inlet and outlet passages and the overlying portions have free edge portions extending in the direction of curvature of the flexible sheet and adapted to be flexed toward said convex surface member by fluid pressure from said passages whereby the overlying portions of the flexible sheet are reversely curved under the force of said fluid pressure and return resiliently to original passage closing condition when such pressure is not acting thereagainst.

Abstract: Fluid control apparatus including inlet and outlet check valve assemblies connected to a mounting block, filter means operatively associated with the check valve assemblies and a pulse damper device positioned on the mounting block for maintaining a continuous pressure on fluid after it has passed through the check valve assemblies.