Abstract: A damper assembly for a fuel pump includes at least one diaphragm assembly formed by joining two metal diaphragms to respective two sides of an imperforate central plate, thereby creating a pair of closely spaced diaphragms, each acting upon its own gas volume. Preferably, the diaphragm assembly has (a) a rigid, relatively thick circular or polygonal central plate, (b) a first circular diaphragm having a rim portion sealingly secured as by welding to the plate and a relatively thin, flexible, convex portion projecting from one side of the plate and defining a first pressurized gas volume, and (c) a second circular diaphragm having a rim portion sealingly secured as by welding to the plate and a relatively thin, flexible, convex portion projecting from the other side of the plate and defining an independent second pressurized gas volume.

Abstract: The invention relates to a piston pump, which is intended for use as a return pump for a slip-controlled hydraulic vehicle brake system. To simplify the manufacture of a piston of the piston pump, the piston includes a thin sleeve.

Abstract: The invention relates to a piston pump with a piston received axially displaceably in a pump bore. To improve the aspiration performance of the piston pump. A cuff with a U-shaped annular cross section is provided, the cuff is inserted into the pump bore surrounding the piston, an outer lip forms a diaphragm, which rests against a wall of the pump bore and is acted upon on its outside with ambient pressure through a venting bore. The cuff is part of a fluid storage element, which makes an additional fluid volume available to the piston pump. The diaphragm acted upon by ambient pressure creates a pumping effect, if a fluid pressure in the fluid storage element drops below ambient pressure in an intake stroke of the piston.

Abstract: A cylinder injection high-pressure fuel pump permits reduction in size and cost thereof and it is also capable of securely absorbing high-frequency pulsations. The cylinder injection high-pressure fuel pump (200) has: a casing (1) in which an inlet passage (2) for taking fuel in and a discharge passage (35) for discharging the fuel are formed; a cylinder (30) formed in the casing (1); a fuel pressurizing chamber (32) formed in a part of the cylinder (30); and a plunger (31) disposed in the cylinder (30) such that it may reciprocate therein. As the plunger (31) reciprocates, the fuel is taken into the fuel pressurizing chamber (32) through the inlet passage (2) and pressurized therein, then the pressurized fuel is discharged through the discharge passage (35) and forcibly fed into a fuel injector of a cylinder injection type engine.

Abstract: A highly manufacturable gas compressor includes a sheath removably attached to a piston by several resilient fingers that snap into place at the bottom of the piston. The fingers act to limit relative motion between the piston and sheath as the piston is reciprocated within a cylinder bore. During the suction stroke of the compressor, the piston and sheath separate at their tops, creating an opening at the top of the sheath which allows low pressure gas to flow through an opening formed in the side of the sheath, between the sheath and piston, through the opening at the top of the sheath, and into a compression chamber formed between the top surfaces of the piston and sheath and the bottom surface of a discharge valve.

Abstract: A noise-reducing apparatus for a linear compressor which can significantly reduce noise by forming a multistage silencer in the suction side of a refrigerant passage of a linear compressor in which an axial flow valve system is adopted and therein a plurality of silencers formed connected to the suction side of the refrigerant passage inside a piston slidably disposed inside the cylinder.

Abstract: An eccentric-motion motor for driving a utilization mechanism includes a stator defining a closed surface pathway, an armature composed of a permanent magnet rollably disposed on the closed surface pathway, a series of electromagnetic elements disposed in the stator along the closed surface pathway, circuitry for successively energizing the electromagnetic elements to cause them to attract and/or repel the armature so that it rolls along the closed surface pathway, and a coupler mechanism for coupling the armature to the utilization mechanism so that as the armature is caused to roll, the utilization mechanism is powered by the operation of the motor.

Abstract: Reverse osmosis, particularly for manually operating water desalination, is achieved using semipermeable membranes which selectively permeate purified water from a feed solution pressurized by reciprocating piston or diaphragm pump. The manual pump action is assisted by using two pump pistons to provide a continuous flow of feed solution to the concentrate side of the membrane to continuously flush the membrane surface. The concentration polarization is controlled by exhausting the high pressure concentrate to atmosphere through an orifice and relief valve.

Abstract: A gear rotor fuel pump having a gear rotor pump assembly received on a cantilever bearing in an end cap of the pump and an armature journalled for rotation at one end in the bearing while being rotatably unsupported at its other end for preventing bearing misalignment and reducing pump noise. The end cap preferably carries a bellows modulator for reducing pump noise by reducing the amplitude of fuel pressure pulses transmitted to the bellows from the pump assembly through a port in the end cap. To further reduce noise, the end cap preferably has at least one cavity for receiving compressible gas therein to further absorb the pressure pulses as well as noise generated by turbulent fuel flow at a pump inlet.

Abstract: A pneumatic calibration system and the pump therefore, the system comprising a first fluid containing chamber for attachment to a device to be tested, a valve coupled to the first chamber to remove the fluid from the first chamber and a pump structure for providing a predetermined pressure to the fluid in the first chamber. The pump comprises a first piston disposed and moveable within first chamber to vary the volume of first chamber, a second piston, a second fluid containing chamber communicating between the first piston and the second piston, the second piston providing a predetermined pressure to the fluid in the second chamber and an expanding sleeve valve communicating between the first chamber and the second chamber to minimize the pressure differential across the first piston. The position of the first piston is adjustable in the first chamber. The second chamber includes a first portion and a second portion with a sleeve valve disposed therebetween.

Abstract: An electric-motor fuel pump that includes an inlet end cap, an outlet end cap and a case coaxially joining the end caps to form a closed pump housing. An electric motor is disposed with the housing, and includes an armature journalled for rotation between the end caps, a stator surrounding the armature and means for applying electrical power to the motor. The armature is coupled to a gerotor mechanism for pumping fuel from the inlet to the outlet through the housing. The gerotor pumping mechanism comprises an annular wall on the inlet end cap forming an open pocket axially opposed to the armature. Inner and outer gear rotors are disposed within the pocket, and have radially opposed intermeshing teeth that define circumferentially disposed expanding and ensmalling pumping chambers. The inner gear rotor is coupled to the motor armature. Inlet and outlet gerotor ports in the inlet end cap axially open between the rotors into the expanding and ensmalling chambers respectively.

Abstract: An electric-motor fuel pump that includes an inlet end cap, an outlet end cap and a case coaxially joining the end caps to form a closed pump housing. An electric motor is disposed with the housing, and includes an armature journalled for rotation between the end caps, a stator surrounding the armature and means for applying electrical power to the motor. The armature is coupled to a gerotor mechanism for pumping fuel from the inlet to the outlet through the housing. The gerotor pumping mechanism comprises an annular wall on the inlet end cap forming an open pocket axially opposed to the armature. Inner and outer gear rotors are disposed within the pocket, and have radially opposed intermeshing teeth that define circumferentially disposed expanding and ensmalling pumping chambers. The inner gear rotor is coupled to the motor armature. Inlet and outlet gerotor ports in the inlet end cap axially open between the rotors into the expanding and ensmalling chambers respectively.

Abstract: A sampling pump is provided suitable for pumping a discrete quantity of either a liquid or a gas per pump stroke from a flow line to a sample vessel. An operator unit drives a piston within the pump bore, and controls the stroke of the piston and thus the quantity of fluid pumped per stroke. A balanced check valve mechanism controls flow from the pump bore to the pump outlet port, and is provided within and carried by the piston. Line pressure acts on the operator end of the piston to assist the operator in driving the piston during its power stroke. A manifold may be secured to the pump body, and has a flow path therein which is in communication with the inlet port to the pump bore. The pump may also be used for injection purposes to introduce a selected quantity of fluid to a high pressure line.

Abstract: The preparation of abrasives, especially abrasive papers and abrasive fabrics, is improved by using an epoxy resin in conjunction with a cationic photoinitiator as binder for the abrasive particles. The binder is cured by irradiation with shortwave light and subsequent heating. The process is distinguished by low curing temperatures and brief curing times.

Abstract: A hermetic reciprocating piston refrigeration compressor utilizes separate cylinder head members for the discharge and suction plenum chambers adjacent the discharge and suction valves. The two cylinder heads extend over substantially the entire area of the valve plate at the end of the cylinder carrying the valves. A discharge cylinder head is formed of metal while the suction cylinder head is formed of a plastic material of low thermal conductivity to minimize heat transfer between the discharge and suction plenums. The suction cylinder head is formed as a unitary member to include also passages and a portion of the suction muffler and is secured in place by a single fastening member.

Abstract: An extra-high pressure water pump includes a cylinder barrel, a piston and a pair of double check valves. The piston is composed of a main piston and a lubricating oil piston. The lubricating oil piston has a double piston ring and is slidably mounted on an additional piston rod connected to the main piston head. Lubricating oil is filled in a lubricating oil room made between the main piston and the lubricating oil piston in the cylinder barrel. The pressure between the lubricating oil and water in the pump is naturally kept at the same level by sliding a position of the lubricating oil piston on the additional piston rod, so that a sudden imbalanced pressure between the lubricating oil and the water in the cylinder barrel does not break the lubricating oil piston.The extra-high pressure water pump supplies extra-high pressured water to its small carriable water jet gun.

Abstract: Multi-cylinder reverse osmosis pump having at least three cylinders, each feed cylinder having a displacer rod carrying a displacer to divide the cylinder into respective pumping and expansion chambers. Each displacer rod has an expansion chamber valve portion directly associated therewith to control flow of concentrate fluid relative to an expansion chamber of a cylinder other than that directly associated with the respective cylinder rod. Dwell is provided for each cylinder to permit initial travel of the displacer rod at the beginning of each rod stroke while the corresponding valve controlling that cylinder is closed. The displacer rods are phased apart so that when a particular rod of a particular cylinder reaches an end of each stroke, another rod associated directly with the valve controlling that particular cylinder is approaching the mid-stroke position thereof so that the valve directly associated with the other rod is closing.

Abstract: Reverse osmosis, particularly for water desalination, uses semipermeable membranes which selectively permeate purified water from a feed solution pressurized by a reciprocating feed pump driven by rotating crankshaft. Pump action is assisted by depressurizing concentrate fluid within the pump cylinder, which has an internal displacer separating feed and concentrate fluids. Directional valves controlling concentrate fluid flow to and from pump cylinder are actuated mechanically by crankshaft. A dwell interval is provided in displacer motion to permit completion of directional valve actuation while displacer is stationary and displacer rod is providing compression or decompression action to approximately equalize pressure differences across valve ports prior to valve actuation.

Abstract: This pumping system provides a continuous discharge of flowable product withdrawn from a container into a pressurizing chamber and pumped by a pressurizing piston there into a storage chamber just ahead of a stationary discharge nozzle. A spring acts on an accumulator piston in the storage chamber to maintain a more uniform pressure on the product there at different times in each operating cycle so as to obtain a substantially non-pulsating discharge of the product. The accumulator piston tends to move in the same direction as the pressurizing piston due to a frictional coupling acting on the accumulator piston. Air is more easily purged from this pumping system.

Abstract: A pump type dispenser for dispensing a spray of liquid has a container for containing the liquid to be dispensed, a piston-cylinder device for drawing liquid out of the container and pressurizing it, a dispensing head into which the pressurized liquid is pumped, with a free piston chamber therein in which is a free piston spring loaded toward the direction from which the pressurized liquid comes, and a nozzle opening out of the free piston chamber through the dispensing head. A check valve between the piston-cylinder device and the free piston chamber blocks return of the fluid once it has been forced into the free piston chamber, so that the free piston acts on the liquid in the free piston chamber to dispense it in a spray through the nozzle while the piston-cylinder device recovers from its actuated to its unactuated position and the next actuation thereof is started.

Abstract: A pumping system is disclosed in which a storage compartment formed by a spring-loaded piston and cylinder assembly cooperates with a trigger actuated, spring loaded piston and cylinder assembly to store some product during a pressure stroke and discharge that product on a subsequent intake stroke to maintain a stream or spray issuing from the system. In a preferred embodiment, the trigger is part of a lever so constructed as to apply to the trigger actuated piston and cylinder assembly a force which is greater than the force applied to the trigger by the finger of a person. The lever projects outwardly beyond the outlet orifice of the pumping system and forms a ramp and opening for returning drips from the outlet orifice to the trigger actuated piston and cylinder assembly and ultimately to the container. The storage compartment preferably includes a strainer which strains product flowing through the storage compartment in order to inhibit clogging of the outlet orifice of the pumping system.

Abstract: A sludge pump which includes successive inlet, work and outlet chambers interconnected by one-way valves. Means is provided to periodically vary the volume of the work chamber thereby to induce transfer of fluid through the work chamber from the inlet to the outlet chamber. Also disclosed is a method of removing sludge from a sludge collection pit by periodic variation of the volume of an enclosed chamber in communication with the pit and with a chosen disposal site.

Abstract: A non-pulsating, non-throttling, vented pumping system is disclosed for continuously dispensing product from a container in a relatively non-pulsating stream or spray. The pumping system includes a pump for withdrawing product from a container and for pressurizing the product, a storage compartment for storing the product under pressure, an accumulator piston in the storage compartment acting under bias to maintain the pressure on the product, an outlet passage opened and closed by the accumulator piston, and a restricted orifice at the outlet passage through which the product is dispensed as a stream or spray. The restricted orifice allows only a portion of the product pressurized by the pump to escape during the pressure stroke of the pump, and the remainder of the product is stored in the product storage compartment to be released for maintaining the spray or stream when the pressurizing pump is acting on its intake stroke.

Abstract: A hermetic reciprocating piston refrigeration compressor utilizes separate cylinder head members for the discharge and suction plenum chambers adjacent the discharge and suction valves. The two cylinders heads extend over substantially the entire area of the valve plate at the end of the cylinder carrying the valves. A discharge cylinder head is formed of metal while the suction cylinder head is formed of a plastic material of low thermal conductivity to minimize heat transfer between the discharge and suction plenums. The suction cylinder head is formed as a unitary member to include also passages and a portion of the suction muffler and is secured in place by a single fastening member.