Abstract: An electromagnetic pump particularly adapted for use with oil burners is disclosed. The pump embodies an armature that is reciprocated by a magnetic field produced by an electromagnetic coil. The armature drives the piston of a piston pump that is adapted to pump a liquid at low volume and high pressure. The pump also embodies a diaphragm disposed in a chamber having an inlet portion on one side of the diaphragm and an outlet portion on the other. The inlet portion of the chamber is connected to a liquid supply line leading to the pump and the outlet portion is connected to the discharge of the piston pump and also to a valve-controlled vent leading to atmosphere. The diaphragm is moved in one direction only by the armature and in the opposite direction by a spring. When there is air in the liquid supply line, the vent valve is opened and the diaphragm rapidly pumps air to the atmosphere. When liquid is discharged from the vent, the valve is closed.

Abstract: The present infusion pump has a housing with an insert in the housing which s closed by a cover. The insert has a bore defining the pump volume. The insert also defines passageways and at least one chamber in the pump. One of two membranes is held between the insert and the pump housing and forms an inlet valve. The other membrane is arranged between the insert and the cover and forms the pump membrane proper as well as an outlet valve. Normally, in the rest condition of the pump, a magnetic drive member urges a pressure element against the pump membrane and against the inlet valve membrane contrary to the force of a spring. In operation, the spring opens the inlet valve thereby also actuating the pump membrane for its suction stroke. The magnetic drive member returns the pump membrane and the inlet valve back into the rest position thereby actuating the pump membrane for its pressure stroke while closing the inlet valve.

Abstract: The casing of a fuel pump section having a motor-driven fuel pump is integrally formed with a damper which is provided with a damping chamber for damping fuel pressure pulsation. The damping chamber is communicable with the interior of the casing of the fuel pump section through apertures formed through the outer wall of the casing so that the damping chamber is supplied with fuel pressurized by the fuel pump. A resilient umbrella type check valve member is securely disposed to cover the apertures of the outer wall of the casing of the fuel pump section so that the fuel flows only in a direction from the interior of the casing to the damping chamber.

Abstract: A pump for precise, smooth delivery of liquid, particularly in liquid chromatography systems, featuring two liquid displacement elements mounted for reciprocating movement in chambers connected in series with two check valves, one displacement element serving to accumulate some of the liquid delivered by the first element and to deliver the accumulated liquid while the first element is refilling.

Abstract: A pulse damper for use in high-pressure liquid pumping applications such as liquid chromatography comprises a length of flattened polytetrafluoroethylene tubing that can be coupled to the high-pressure liquid flow line. The flattened tubing is enclosed within a liquid-tight housing structure completely filled with a compressible liquid, and the end of the tubing are coupled to the high-pressure flow line by fittings mounted inside the housing structure. When a transient pressure variation occurs in the flow line, the cross-section of the tubing changes from a flattened elliptical configuration to a more rounded configuration as the pressure pulse temporarily overcomes the stresses that tend to maintain the tubing in its flattened configuration. The restoring force of the compressible liquid in the housing structure surrounding the tubing prevents expansion of the tubing beyond a desired limit during a pulse, so that the tubing cannot burst when its cross-sectional configuration changes.

Abstract: An improved pump and motor assembly is utilized to regulate a flow of fuel to an internal combustion engine. All of the fluid connections to the pump are connected with one end of the assembly. The pump and motor are both enclosed within a one-piece casing having a tubular side wall which is integrally formed with an end wall. The end section to which all of the fluid connections for the pump are made, is connected across the open end of the tubular side wall. To provide for the removal of vapor bubbles from the fuel, fuel supplied under pressure from the tank flows through an inlet cavity which circumscribes the pump and has an axial extent which is equal to the length of the pump. In addition, a screen at the inlet of the pump itself blocks the flow of vapor bubbles from the inlet cavity to the pump. The forces applied against opposite sides of the moving components of the pump by the inlet fluid are substantially balanced.

Abstract: A carburetor having an accelerator pump for pushing fuel contained in the chamber of the pump into an air intake passageway of the carburetor by means of an accelerating pump piston during acceleration, a second pump chamber being expandable and contractable and communicating with the pump chamber via a throttle and a pressure control means for constantly applying pressure to said second pump chamber in a direction whereby the second pump chamber is allowed to expand only when fuel pressure in the second pump chamber exceeds a predetermined value.

Abstract: A pump has a boost-retarding device which comprises a cylinder communicating between the suction side and the discharge side of the pump. A plunger slidably and reciprocatingly fits into the cylinder and a lead passage communicates between the suction side and the discharge sides which are divided by the plunger. An adjustable spring biases the plunger toward the discharge side, and a valve mechanism cuts off the outflow of a liquid, from the discharge side to the suction side, which outflow occurs responsive to a movement of the plunger toward the suction side.

Abstract: Rupture of the transition piece in one or more combustors of a gas turbine, due to resonance at the transition piece natural modal frequency, is avoided by interconnecting pairs of fuel lines having sinusoidal fluctuations in fuel flow that are 180.degree. out of phase with each other through opposite ends of an accumulator containing a movable partition displaced according to relative pressure on either side of the partition.

Abstract: A motor pump comprises a DC motor unit, a pump unit and a cover housing for the motor and pump unit; the motor unit includes a cup-shaped yoke with the bottom having a bearing and a bearing holder fitted into an opening in the cup-shaped yoke to thereby hold an armature shaft of the motor unit in position with respect to the yoke; a compressible silencer is also installed in the cup-shaped yoke adjacent permanent magnets, an armature surface and the yoke.

Abstract: A pneumatic system consisting of an air pump, air-passage switching means, operating components and air pipes connecting those together. This pneumatic system features improvements in a pressure smoothing means for smoothing a surge pressure discharged from an air pump in the pneumatic system, which pressure smoothing means is built in the pneumatic system between the air pump and the air-passage switching means. The pressure smoothing means includes an air chamber having an air inlet and an air outlet, and means for increasing and decreasing the volume of the air passage defined between the aforesaid air inlet and outlet, commensurate to the surging discharge pressure from the air pump, i.e., in response to the surge pressure of the air being admitted in the air chamber. This pressure smoothing means is provided with a pressure receiving plate which is displaced under the air pressure being introduced into the air chamber, whereby the volume of the air passage defined within the air chamber may be adjusted.

Abstract: Hydraulic surge protection is provided in a pumping plant by providing a synchronous motor/generator connected across the electrical power bus lines used to energize the motor operated pumps for pumping liquid through a pipeline. A fly wheel is provided on the synchronous motor/generator having an inertia to maintain the motor/generator operating in the event of an electrical power failure between the bus lines and source of electrical energy to generate and feed current to the pump drive motors through the bus lines to maintain pumping operation thereof. This pumping operation is maintained a sufficient length of time to minimize separation of the liquid column being pumped in the pipeline to an extent that damaging water hammer is prevented.

Abstract: A back-washable filtering element, especially for use with pumps, and more particularly for use with pumps that handle liquids with solid material entrained therein, consists of a helical coil spring disposed in a flow path for the liquid to be filtered. A movable element in the flow path is mechanically connected to the spring and compresses it axially under the effect of the back washing liquid to automatically reduce the flow capacity. The resultant "shrugging" of the spring also permits it to clear itself of filtered material to facilitate the back-washing.

Abstract: A mechanical refrigeration system and method of operating the same with a combined hermetic compressor and suction accumulator unit. The compressor includes an electric motor and gas pump driven thereby enclosed within a hermetically sealed first casing having a top wall disposed thereabove in the normal operational orientation of said motor and pump. The accumulator comprises a second casing superimposed on the first casing, of inverted cup shape with the lower edge thereof joined to the first casing such that said first casing top wall closes the lower end of said second casing. Refrigerant fluid from the system suction return line enters the second casing via inlet means oriented to induce a whirling flow of refrigerant fluid in the accumulator casing generally concentric with the upright axis thereof, and a gas liquid-separating standpipe means is disposed within said second casing having a gas outlet extending through said first casing top wall and communicating with an inlet to said gas pump.

Abstract: A damper for use with a high pressure pumping system, such as a liquid chromatography system, which incorporates a reciprocating pump. The device is a generally enclosed canister including an internally formed flow volume. Inlet and outlet passages through the canister communicate with the flow volume, the inlet passage being connectable to receive the high pressure flow. A compressible body, e.g. of Teflon is positioned in the flow volume. The dimensions of the body are slightly smaller than those of the surrounding volume, whereby the high pressure flow passing between the inlet and outlet flows through the space between the body and the internal canister walls. The compression and decompression of the body in response to the pulsations in the flow dissipate the energy carried by the pulses, thereby damping same.

Abstract: A pump comprises a tubular resilient pump element alternately extended and relaxed for longitudinal deformation and reinforced by means of filaments arranged in helices, preferably with different helices of opposite hands present, whose pitch angle is other than arccot .sqroot.2 so longitudinal deformation will result in volumetric changes. Inlet and outlet valves ensure unidirectional flow through the pump element.To smooth out flow a similarly constructed accumulator element, whose reinforcement pitch angle is chosen with a value such that the pump and accumulator pitch angles are on opposite sides of arccot .sqroot.

Abstract: A pump for fluent materials, and especially suitable for heavy and abrasive materials, has a piston in substantial clearance relation within a cylinder and operable in a pumping stroke to drive into a combination valving, wiping and sealing elastomeric ring about the discharge portion from the cylinder, so that the pumped material has minimal drag and wearing contact with relatively moving parts in the pump. The pump is adaptable for double action and proportional pumping.A self-reversing piston-driving fluid actuated motor is provided.

Abstract: A motor driven refrigeration compressor having a cylinder head and base of laminated construction. The laminations are formed from flat sheet stock with apertures which define inlet and outlet ports and passages for refrigerant flow. The base is bell shaped and the enclosed end contains integral inlet ports and passages which direct refrigerant past the motor and into the compressor. The base walls contain integral outlet passages which convey the refrigerant from the compressor to an outlet tube in communication with a condenser. Both the inlet and outlet passages contain noise reducing cavities which decrease the effect of the pulsations inherent in a piston-type compressor.

Abstract: A suction stabilizer for reciprocating pumps and method of stabilizing the inflow of liquid to the suction side of the pump. The stabilizer comprises a substantially cylindrical tank, a perforate-walled cage at one end of the tank, and a flexible resilient gas-filled bladder within the cage. Liquid passes through the tank as it moves from a source to the suction side of the pump. Between suction strokes the liquid compresses gas in the bladder. During suction strokes the pressure of the gas adds to the head of liquid entering the pump. The invention involves critical ratios of the tank volume to both the pump displacement and the bladder volume.

Abstract: A high pressure piston pump especially suitable for moving heavy high viscosity and abrasive materials, which has its piston in substantial clearance relation in a cylinder, is operable in a pumping stroke to drive into a flexibly deflectable, elastic combination valving, wiping and sealing elastomeric ring which not only maintains tensioned sealing engagement with the piston but also reacts to pump pressure to improve the sealing engagement during pumping stroke of the piston, and permits relaxation of grip on the piston and leakage forwardly along the piston during return stroke suction in front of the piston.

Abstract: A carburetor utilizing an acceleration pump, acting in conjunction with the throttle valve, to supply fuel through an injection channel to the fuel-air mixture chamber. A fuel accumulator contains a diaphragm under bias forming a diaphragm chamber of predetermined volume connected to the injection channel by a branch channel, a portion of the fuel supplied by the acceleration pump being diverted to the diaphragm chamber against the bias. The diverted fuel is fed to the fuel-air mixture chamber when the bias exceeds the pressure from the pump and the proportion of fuel diverted is controlled by the relative sizes of the open areas in restrictors positioned in the outlet of the injection channel into the fuel-air mixture chamber and of the branch channel into the diaphragm chamber, the strength of the bias and the maximum deformation of the diaphragm being adjustable.

Abstract: In a liquid chromatograph apparatus, a pulse damper consists of a block of solid material almost filling the cavity of the damper, for example a polytetrafluoroethylene block occupying 99% of the volume of the cavity but arranged to move freely therein.

Abstract: A single acting dual piston positive displacement pump with alternating piston motion. A pump suitable for manual operation and operable at relatively high pressure such as 400 to 800 psig. A pump suitable for pumping corrosive liquids with the drive mechanism separated from the liquid lines. A pump housing with cylinder section and abutting manifold section, with the alternating reciprocating pistons in the cylinder section and the inlet and outlet openings in the manifold section, with the pistons projecting from the cylinder section opposite the inlet and outlet openings for connection to the piston drive mechanism.

Abstract: The pulsations produced by a pulsating positive displacement pump are damped by interposing in the inlet line to the pump a conduit carrying at least one upstanding open ended tube having its lower end communicating with the conduit.