Abstract: A disposable plastic pump for dispensing liquids is disclosed which comprises two basic unitary, preferably all plastic, elements: a chamber forming body having an open outer end and an inner end in fluid communication with a liquid reservoir, and a piston formed to slidably fit into the chamber. The chamber forms two axially adjacent coaxial chambers, an inner chamber of one diameter and an outer chamber of a different diameter. The piston comprises a stem on which is located two spaced flexing disc each sized to fit in and serving as a one-way valve in the inner chamber and outer chamber, respectively, permitting fluids to flow outwardly past each flexing disc. A sealing disc is located on the stem outwardly of the outermost flexing disc. A passageway is provided from an inlet on the piston between the outermost flexing disc and the sealing disc through which the dispensed liquid flow.

Abstract: A volumetric pump for administering intravenous fluids to a patient comprises a housing having an elongate cavity therein with an open and a closed end. A resilient sheet of material having two branched portions which form a centrally-located aperture is disposed over the open end of the housing. A pump shaft is slidably disposed through the aperture such that one branched portion toward the cavity and the other branched portion extends away from the housing such that a sphincter seal is formed about the shaft. An inlet conduit leading from a fluid source such as an IV bag passes through the housing into the cavity near one end thereof, and an outlet conduit leading to a fluid sink such as a patient passes through the housing from the cavity near the other end thereof.

Abstract: An inverted, displacer type piston pump for metering and dispensing liquids in which the cylinder is located beneath the piston and reciprocated via an actuator below the cylinder, and where the piston is held fixed. The liquid ingress and egress to and from the cylinder of the pump is via a cylindrical port through the piston along its cylindrical axis. The pump is designed so that liquid product loss through the pump is prevented without the use of elastomeric or compliant seals in the liquid contact product areas of the pump. In addition, the pump cylinder is capable of being positioned via its reciprocating actuator such that all of the liquid product contact parts are open and accessible to cleaning and sterilizing fluids which may be introduced into the pump through the liquid product supply port of the pump, thereby enabling cleaning and sterilization of the pump without its disassembly.

Abstract: A plunger pump includes a piston which is driven for reciprocatory motion and associated with a check valve. A space within a cylinder is partitioned by a piston 1p into a first space A which communicates with a discharge port 1ep and a second space B which communicates with a suction port 1ip. To reduce the peak value of a fluctuation in the suction pressure, a third port 2ip communicating with the first space A is added, and the suction port 1ip and the third port 2ip are connected in common to a suction line Pin through check valves 20 and 19, respectively. The first space A has a diameter greater than the diameter of the piston while the second space B has a diameter which is comparable to the diameter of the piston and hence is less than that of the first space A. On the forward stroke of the piston, a braking liquid is drawn into the second space from the suction line Pin.

Abstract: A flow-through filling pump for receiving a liquid supply and discharging a predetermined amount of the liquid therefrom includes a housing defining a supply chamber and a discharge chamber and a reciprocating piston positioned in the housing intermediate the supply and discharge chambers. The piston is movable along an axial liquid flow path defined by the chamber, between a fill position and a discharge position. A drive assembly is operably connected to the piston to drive the piston between the fill and discharge positions. A seal member extends between the piston and the housing to isolate the supply and the discharge chambers and at least a portion of the piston from a portion of the housing at which the drive assembly operably connects to the piston. The pump includes a non-return type inlet valve mounted to the piston. The inlet valve has a biasedly mounted valve element, which is biased to the closed position.

Abstract: A reversible valve ball assembly for use in a down-hole pump oil field check valve. The reversible valve ball can be removed, inverted and reinserted into the check valve to provide a new valve ball sealing surface. The reversal of the valve ball is performed after the original valve ball sealing surface has worn and deteriorated so that it can no longer seat properly to form a seal between the valve ball surface and a valve seat. The valve seat is also reversible. A set of irregularly shaped valve ball guide arms are provided which rotate within valve guide apertures to provide a cleaning action between the valve guide apertures and valve ball arms to prevent accumulation of debris which tends to immobilize the reciprocating valve ball. An elongated gas-breaker fin is provided and can be used to prevent gas lock. The gas-breaker fin enables a reduced vertical length for the valve ball arms so that a reversible symmetric valve ball assembly can be utilized.

Abstract: The invention relates to a reaction chamber, which includes a cylindrical vessel, with at one end, at least one inlet or outlet tube or lead-through fitted with a valve for a liquid or gaseous component. The other end of the vessel is open. The reaction chamber further comprises a plunger, which performs a reciprocating movement within the cylindrical vessel in axial direction through the open end of the vessel. The plunger tightens against the inner wall of the cylindrical vessel, and has at least one channel, in substantially axial direction, fitted with a valve or connected to a tube fitted with a valve. The invention relates also to an assay method based on the use of the reaction chamber.

Abstract: A disposable plastic pump for dispensing liquids is disclosed which comprises two basic unitary, preferably all plastic, elements: a chamber forming body having an open outer end and an inner end in fluid communication with a liquid reservoir, and a piston formed to slidably fit into the chamber. The chamber forms two axially adjacent coaxial chambers, an inner chamber of one diameter and an outer chamber of a different diameter. The piston comprises a stem on which is located two spaced flexing disc each sized to fit in and serving as a one-way valve in the inner chamber and outer chamber, respectively, permitting fluids to flow outwardly past each flexing disc. A sealing disc is located on the stem outwardly of the outermost flexing disc. A passageway is provided from an inlet on the piston between the outermost flexing disc and the sealing disc through which the dispensed liquid flow.

Abstract: A volumetric pump for administering intravenous fluids to a patient comprises a housing having an elongate cavity therein with an open and a closed end. A resilient sheet of material having a centrally-located aperture covers the open end, and a pump shaft is slidably disposed through the aperture to form a sphincter seal therebetween. An inlet conduit leading from a fluid source (an IV bag) passes through the housing into the cavity near the open end thereof, and an outlet conduit leading to a fluid sink (the patient) passes through the housing from the cavity near the closed end thereof. The shaft is driven back and forth in reciprocating motion inwardly and outwardly of the cavity to produce, respectively, a positive pressure forcing fluid out of the outlet conduit to the fluid sink, and a negative pressure forcing fluid from the fluid source through the inlet conduit.

Abstract: A hydraulically operated pump for in-ground filtering and monitoring of ws or other fluid sources, including a hollow cylindrical pump housing with an inlet and an outlet, filtering devices positioned in the inlet and the outlet, a piston that fits slidably within the pump housing, and an optical cell in fluid communication with the pump housing. A conduit within the piston allows fluid communication between the exterior and one end of the piston. A pair of o-rings form a seal between the inside of the pump housing and the exterior of the piston. A flow valve positioned within the piston inside the conduit allows fluid to flow in a single direction. In operation, fluid enters the pump housing through the inlet, flows through the conduit and towards an end of the pump housing. The piston then makes a downward stroke closing the valve, thus forcing the fluid out from the pump housing into the optical cell, which then takes spectrophotometric measurements of the fluid.

Abstract: A method of preparing a liquid reservoir disposable pump for insertion into a permanent dispenser housing is disclosed. The pump comprises two basic unitary, preferably all plastic, elements: a chamber forming body having an open outer end and an inner end in fluid communication with the liquid reservoir, and a piston formed to slidably fit into the chamber. The reservoir and pump are prepared for insertion into the permanent housing by first substantially filling the reservoir with liquid, and then evacuating air from the reservoir by applying a vacuum to the outer end of the chamber to provide vacuum pressure sufficient to draw air out of the chamber and reservoir.

Abstract: An improved pump structure including a shaft tube, a pivot tube, a piston element, a push and pull element and a handle element. The shaft tube is inserted inside the tube. The pivot tube's two ends are respectively connected to the handle element and the piston element. The piston element is disposed in the air chamber of the push and pull element. By an ingenious arrangement of holes, tubes and unidirectional valves, the reciprocating travels of the push and pull element permit simultaneous pumping and air intake, increasing the pumping efficiency.

Abstract: An air pump piston is provided peripherally with a first leakproof ring and a second leakproof ring, which are located respectively and contiguously at both ends of the piston. Located peripherally between the first and the second leakproof rings is a radially disposed air hole. The piston is fastened at the second end thereof with a piston rod such that the air hole of the piston is in communication with an axial passageway of the piston rod. The piston is further provided peripherally between the first leakproof ring and the air hole with at least one first duct disposed radially. The piston is still further provided peripherally with at least one second duct which is disposed radially and located between the second leakproof ring and the air hole. The piston is provided at the first end thereof with an air admitting hole in communication with the first duct. The piston is provided at the second end thereof with an air duct in communication with the second duct.

Abstract: An air pump comprises a head; an air guiding tube fastened at one end thereof with the head and at another end thereof with a two-way air admitting piston; a first cylinder fitted over the two-way air admitting piston such that the first cylinder can be caused to move back and forth; a first one-way valve disposed in the anterior end of the first cylinder; a second piston disposed in another end of the first cylinder; a first one-way valve permitting air to enter only the first cylinder; a second cylinder fitted movably over the second piston; and a second one-way valve disposed in the second cylinder to permit air to enter only the second cylinder which is fastened with the first cylinder without being able to move in relation to the first cylinder.

Abstract: The invention relates to a structure of a liquefied hydrogen pump, located within a liquefied hydrogen fuel tank of a hydrogen (gas ignited) engine, in which a cylinder holder is linked to a lower end of the connecting rod which is reciprocated upwardly and downwardly by means of an external driving source via a first universal joint and a cylinder is housed within a piston holding member via each arm of the cylinder holder so as to be enabled to move upwardly and downwardly. A stepped engagement recess is formed in a bottom end portion of a pump housing. A bottom lid of the piston holding member is linked to an engagement rod via a second universal joint, the engagement rod being received by the engagement recess so that a radial displacement of the piston holding member and piston member to the pump housing is permitted and an automatic axial alignment of both piston and cylinder to an axial line 01--01 of the pump housing is carried out.

Abstract: A manually operated reciprocating liquid pump employs both a priming valve and a check valve where the priming valve performs the dual functions of priming the pump and sealing the pump to prevent inadvertent leakage of liquid through the pump when it is not in an upright orientation.

Abstract: A disposable plastic pump for dispensing liquids is disclosed which comprises two basic unitary, preferably all plastic, elements: a chamber forming body having an open outer end and an inner end in fluid communication with a liquid reservoir, and a piston formed to slidably fit into the chamber. The chamber forms two axially adjacent coaxial chambers, an inner chamber of one diameter and an outer chamber of a greater diameter. The piston comprises a stem on which is located two spaced flexing disc each sized to fit in and serving as a one-way valve in the inner chamber and outer chamber, respectively, permitting fluids to flow outwardly past each flexing disc. A sealing disc is located on the stem outwardly of the outermost flexing disc. A passageway is provided from an inlet on the piston between the outermost flexing disc and the sealing disc through which the dispensed liquid flow.

Abstract: An apparatus having a conduit including a reciprocating plunger rod directed therethrough in a coaxially aligned relationship includes an extension conduit directed into a subterranean water supply. A fixed lower valve cooperates with a reciprocating valve mounted to a lower distal end of the plunger rod to effect lifting of water from the water table to a second outlet conduit pipe.

Abstract: A disposable plastic pump for dispensing liquids is disclosed which comprises three basic unitary all plastic elements: a chamber forming body having an open outer end and an inner end in fluid communication with a liquid reservoir, a one-way valve located at the inner end of the chamber between the reservoir and the chamber permitting fluid flow only from the reservoir into the chamber, and a piston formed to slidably fit into the chamber. The piston comprises a stem on which is located an inwardly located flexing element serving as a one-way valve to permit fluid flow outwardly past the flexing element and a sealing element located outwardly of the flexing element. A channel is provided from an inlet on the piston between the flexing element and the sealing element through which the dispensed liquid flows.

Abstract: Air pumps particularly suitable for use with bicycles includes a first elongated tube to form a pump chamber and housing, a second elongated tube coupled with a piston in the first tube to reciprocate the piston within the pump chamber. A flexible hose extends from the piston and through the second tube and has at its exposed end an air valve coupling. The first and second tubes are releasably secured to permit use of the pump as a seat post. The pump includes a first valve on the outside of the piston between atmosphere and a closed end of the pump chamber and a second valve inside the piston between the closed end of the chamber and the flexible hose. The first valve is configured to provide greater seal effect as pressure builds in the closed end of the pump chamber.

Abstract: A compressor asssembly, with particular reference to the suction side thereof, for a gas compressor having one or more cylinders, pistons mounted for reciprocation in the cylinders, cylinder head means mounted over the ends of the cylinders to provide discharge chambers, refrigerant discharge valve elements intermediate the head means and cylinders and providing compression chambers and adapted to open discharge passages to the discharge chambers for pressurized gas on the compression strokes of the pistons and to close the discharge passages on the suction strokes of the pistons, first suction gas inlet passages through the walls of the cylinders at positions remote from the cylinder head means, second suction gas inlet passages in the pistons extending through the outer walls thereof and in communication with the first passages over at least substantial portions of the travels of the pistons, suction gas ports in the tops of the pistons in communication with the second passages, the ports having port seats

Abstract: A combination pressure and vacuum pump for food or drink containers including a pump housing having a pump cylinder therein, a pump head adapted for sealing engagement with a valve stopper on a food or drink container, and a piston in sliding airtight engagement with the pump cylinder; the pump cylinder, pump head and piston defining a pump chamber. A handle is provided for moving the piston and the pump cylinder relative to one another to pump a gas into or out of the food or drink container. The pump chamber is connected to the valve stopper via a first opening when the pump head is sealed to the valve stopper and to the atmosphere via a second opening through a combination pressure and vacuum valve, the combination valve being switchable from a vacuum position to a pressure position.A combination pressure and vacuum valve stopper is also shown which includes a valve element reversible between a pressure position and a vacuum position to convert the stopper between pressure and vacuum use.

Abstract: Refrigerant compressor construction having a cylinder, a piston mounted for reciprocation in the cylinder, a cylinder head mounted over the end of the cylinder to provide a compression chamber, and refrigerant discharge valving in the cylinder head or a valve plate assembled thereto adapted to open a discharge passage for pressurized refrigerant on the compression stroke of the piston means and to close the discharge passage on the suction stroke of the piston, a first suction gas inlet passage through the wall of the cylinder at a position remote from the cylinder head, a second suction gas inlet passage in the piston extending through the outer wall thereof and in continuous communication with the first passage, a suction gas port in the top of the piston in communication with the second passage, the port having a valve seat formed in the top of the piston and a valve disc mounted on the top of the piston for limited axial, floating movement and having a sealing surface adapted to bear against the valve sea

Abstract: Stopper (1) with valve (6) for a bottle, which stopper (1) and valve (6) are integral and of the same elastic material, the valve being surrounded by a circular raised edge (5) and a circular flange (4) for cooperation with a pump (15) made from plastic material.

Abstract: A pump assembly (1) for an atomizing piston pump comprising a piston (16) slidably located in a cylinder (4), a variable volume fluid storage chamber (5) in communication with the cylinder on one side of the piston, means (18) for varying the volume of the chamber, resilient means (17) urging the varying means into a position corresponding to the minimum volume of the chamber, a fluid flow passageway (30, 31) through the piston, a resilient valve member (25) normally closing the passageway and deforming means (23) for deforming the valve member so as to open the passageway only after the piston has moved relative to the cylinder by a predetermined amount greater than zero. The pump assembly has application to dispensing metered doses of medicinal products and ensures that the dispensed dose is independent of finger pressure applied to the actuator.

Abstract: A bore hole pump which eliminates the need for a piston sealingly engaging with the walls of the pump body. The pump comprises a hollow body closed at its lower end by a non-return inlet valve and slidably and sealingly supporting at its upper end, via a seal, a reciprocating riser pipe which is likewise closed at its lower end by a non-return valve. Upward movement of the riser pipe causes fluid to be drawn into the pump body via inlet valve while downward movement of the riser pipe causes fluid to be expelled from the pump body via outlet valve.

Abstract: A pump sprayer has a body with aligned relatively large and small diameter cylinder portions and relatively large and small diameter pistons respectively reciprocable therein and delimiting with the cylinder a variable volume pump chamber during pumping, the small diameter piston shifting relative to the large diameter piston for opening the discharge. Cooperating limit stops acting between the piston members limit the relative movement thereof during a valve open position so as to thereby limit the duration during which the discharge passage is open irrespective of different external reciprocating pressures applied during pumping, such that the output of the sprayer is controlled during pumping.

Abstract: A spray dispenser is presented which atomizes cosmetics, perfumes, and similar products to a state of fine spray throughout its entire spraying period. The pressure of the fluid product being sprayed is maintained by a spring loaded piston and a related valve which opens a passage to the spray outlet only after a predetermined spray pressure is reached and closes it when the pressure approaches a pressure insufficient to produce the fine spray.