Abstract: A vacuum pump is capable of preventing reaction products produced by a process gas from being precipitated in the pump, of holding various pump components in an allowable temperature range, and hence of operating in a wide operation range, and which has increased durability. The vacuum pump has a pump casing having an intake port and an exhaust port, an exhaust assembly disposed in the pump casing and having a rotor and a stator, and a heating unit for heating a stator side component of the exhaust assembly positioned near the exhaust port. The heating unit is disposed in a space inside the pump casing where is evacuated during operation, and held in contact with at least a portion of the stator side component of the exhaust assembly positioned near the exhaust port.

Abstract: In a closed type motor-operated compressor, oil covers are provided at the upper and lower portions of a stator, as well as a porous filter provided between the lower portion coil cover and a support member for supporting a sub-bearing, wherein it is so constructed that gas discharged passes through the filter with certainty after passing through a space defined by an inner diameter of a sealed container and a constituent element(s) of a compressor mechanism, thereby dissolving a problem of decreasing heat change efficiency in a refrigerating cycle due to much of discharge of refrigerating machine oil from a discharge pipe to the refrigerating cycle.

Abstract: The invention concerns a refrigerant compressor with a cylinder block (1), a valve plate (4), a pipe connectable or connected with a suction muffler, a cover (2) covering the valve plate (4), a first sealing (3) between cover and valve plate and a second sealing (5) between valve plate and cylinder block.

Abstract: A gas compression system and method according to which product gas is introduced into and compressed in, a compressor. A portion of the compressed gas is discharged to external equipment, and a portion of the gas is trapped in response to deactivation of the compressor. The trapped gas is passed back to the deactivated compressor.

Abstract: To provide a vacuum pump that may heat a flow path of gas effectively with small electric power. A vacuum pump provided with an outer sleeve, a stator received in a hollow portion of the outer sleeve, a rotor received rotatably within the hollow portion of the outer sleeve for forming a flow path of gas in cooperation with the stator, a base to which the outer sleeve and the stator are to be fixed and supported, a heating electromagnet for generating heat by current supply and forming a magnetic field, a magnetic member forming a magnetic path of magnetic force by the heating electromagnet, and a heat radiation plate made of aluminum and fixed to the magnetic member.

Abstract: A pressure adjusting device has a pumping device, a connector device, and a connection pipe connected to the pumping device and the connector device. The pumping device has a hollow cylinder, a plunger device inserted through the hollow cylinder, a cover covering the hollow cylinder, a check valve and a non-return valve inserted in the cover, and an inhale joint and an exhale joint connected to the cover. The connector device has a stepped post, a threaded rod inserted through the stepped post, a handle bar disposed on the stepped post, and a button disposed on the handle bar and receiving the threaded rod. The threaded rod has a head portion inserted in the connection pipe.

Abstract: An apparatus for high pressure pumping or homogenizing of liquids has a drive motor with a transmission mechanism and a pump section. The transmission mechanism includes a belt train, a gearbox and a crank mechanism which is housed in a crankcase. The pump section includes a pump block, valves, and pistons which are connected to the crank mechanism. The transmission mechanism converts the rotary movement of the drive motor into the reciprocating movement of the pump pistons. The drive motor is placed directly above the crankcase and is surrounded on two sides by partitions which are interconnected by a roof. The partitions form, together with the roof, an air channel such that the driving parts of the apparatus may be cooled in a simple and efficient manner. By use of various arrangements peripheral to the apparatus, the air may be led off or recycled after cooling and recovery of the heat.

Abstract: A valve housing of the control valve has a communication passage communicating a suction port of the compressor with a crank chamber of the compressor. A main valve is provided in the valve housing for opening and closing the communication passage. A spring member resiliently biases the main valve toward its closed position. A pressure actuated unit moves the main valve toward the open position by receiving a suction pressure of the compressor. A flow adjustment valve is disposed in the valve housing for adjusting an open degree of a leak passage and receives the discharge pressure exerting a force on the flow adjustment valve toward its closed position. The flow adjustment valve increases a leak flow rate of a fluid flowing from a discharge port of the compressor to a crank chamber through a leak passage when the compressor provides a lower discharge pressure. A correction spring is disposed between the main valve and the flow adjustment valve.

Abstract: A hand operated pump and filter assembly for transferring low viscosity fluids, such as hydraulic oil, from a supply container to a machine requiring the fluid, and for filtering the fluid. The pump is a combination vacuum and displacement pump. The pump has a barrel with a cylindrical central passageway therein. A piston is positioned within the central passageway and is connected to the lower end of a piston rod. The upper end of the piston rod is attached to a handle for effecting upward and downward movement of the piston. The piston has fluid passageways extending therethrough and valve means associated with the fluid passageways to prevent fluid from flowing through the passageways during the piston upstroke but allowing fluid to flow through the passageways during the piston downstroke.

Abstract: Pumping apparatus is provided for separating liquids from solids in a mixture thereof, the apparatus preferably being of the peristaltic type with a cage with rollers circumferentially spaced around its periphery rotable within a casing, there being at least two flexible tubes extending around the cage, a first, evacuation tube having an inlet end held open within the casing and an opposite end connected to a first outlet in the casing and a second pumping tube extending between an inlet in the casing adapted to be connected to a liquid to be pumped and a second outlet from the casing, whereby upon rotation of the cage, e.g. by an electric motor, a negative pressure will be generated within the casing and the liquid will be pumped through the apparatus. For separating solids suspended in/mixed with the mixture being pumped, an electrical or electrostatic charge is introduced into the mixture.

Abstract: Valve and separator unit is mounted to a housing of a compressor. The unit includes a check valve for preventing the reverse flow of refrigerant, and an oil separator for separating a mist of lubricating oil contained in the refrigerant from the refrigerant. Separated lubricating oil is introduced into a crank chamber via an oil passage, and the separated refrigerant is directed to the check valve, which prevents of the reverse flow of the refrigerant from the external refrigerant circuit to the discharge chamber.

Abstract: A system for separating particulates from a liquid prior to pumping of the liquid. The system is amenable to use, for example, in a wellbore environment for separating sand or other particulate matter from a production fluid. The system uses a sand separator, a submersible pump and a mechanism for reinjecting the particulate matter downstream of the pump discharge. This permits the sand and other particulates to be routed around the pump to reduce the potentially detrimental effects of such particulate matter on certain pumps.

Abstract: A combined umbrella and fan device wherein the umbrella includes a fabric or vinyl canopy, an umbrella hub, a plurality of splines hingedly attached to the umbrella hub supporting the fabric or vinyl canopy, an umbrella shaft extending from the umbrella hub, and a slide collar on the umbrella shaft including a plurality of support stays hingedly interconnected with the splines. The fan subassembly includes a fan motor housing, a clamp for attaching the motor housing to the umbrella shaft below the slide collar of the umbrella, a fan blade hub assembly rotatably disposed about the umbrella shaft between the slide collar and the clamp and having fan blades extending therefrom, a drive collar about the umbrella shaft and attached to and disposed beneath the fan blade hub assembly, a bushing on the shaft between the clamp and the drive collar for rotatably supporting the drive collar, and a drive wheel extending from the motor housing and engaging the drive collar for rotating the drive collar.

Abstract: A system for dispensing and filtering fluid is disclosed, in which the fluid flow path is substantially vertical from the fluid inlet through fluid dispense. Substantially all wetted surfaces are Teflon® or some similar non-contaminating fluid, for applications such as cleanroom processes. A valve and a filter chamber are incorporated into a pump head to simplify the flow path and reduce potential contamination points. Preferred methods, and chips or other microelectronic devices fabricated from the apparatus or methods, are also disclosed.

Abstract: The hydraulic pump, in particular the hydraulic pump of an electro-pump unit, of a type comprising a pump body enclosing a gear pump and provided with a suction aperture for aspirating a low pressure liquid and an outlet chamber for driving back a high pressure liquid, which communicates with a high pressure outlet channel connected to a user hydraulic circuit, and a hydraulic capacity for dampening of pulses generated by the pump and equipped with deaerating means for a draining of air able to be trapped therein, the deaerating means being formed by the high pressure liquid that is driven by the pump back into the outlet channel.

Abstract: A multi-use clean air fan and fan motor mount assembly comprising a bifurcated conical air inlet and blown air deflector, a fan motor mount, motor mount supports, a fan motor and a fan, the bifurcated conical air inlet and blown air deflector having a long outer wall, and a short inner wall, the fan motor mount suspended within the bifurcated conical air inlet and blown air deflector by motor mount supports fastened between the outer wall of the bifurcated conical air inlet and blown air deflector and the fan motor mount, an aperture defining a central opening in the top of the bifurcated conical air inlet and blown air deflector, the fan and fan motor having a common longitudinal axis with the longitudinal axis of the bifurcated conical air inlet and blown air deflector, the fan having a series of vanes extending outwardly from the central longitudinal axis of the fan, the inside of the long outer wall of the bifurcated conical inlet and blown air deflector surrounding more than half of the longitudinal heig

Abstract: Rotary compressor for attenuating a noise generated in operation of the rotary compressor and improving lubrication, including a main bearing which is a component for forming a compression chamber having a discharge passage for discharging a compressed gas and a boss for inserting a shaft of a motor therethrough, and a muffler on a top of the main bearing having a boss hole for passing the boss of the main bearing therethrough and provided for attenuation of a noise, wherein the muffler has no separate refrigerant discharge opening, the boss of the main bearing has a plurality of first discharge openings, and the shaft has a hollow and a plurality of second discharge openings in communication with the first discharge openings.

Abstract: The invention concerns a refrigerant compressor with a cylinder block (1), a valve plate (4), a pipe connectable or connected with a suction muffler, a cover (2) covering the valve plate (4), a first sealing (3) between cover and valve plate and a second sealing (5) between valve plate and cylinder block. On assembling the refrigerant compressor it should be provided that the flow resistance of the suction gas is reduced as much as possible. For this purpose, each of the following pairs of members, cover (2) and pipe (29), pipe (29) and valve plate (4) and valve plate (4) and cylinder block (1), has an alignment device for its members with at least two guiding elements, and that the members (2, 29, 4, 1) are assembled in a direction, which is substantially parallel to the guiding elements.

Abstract: A rotary device containing a housing having a curved inner surface with a profile equidistant from a trochoidal curve, an eccentric mounted on a shaft disposed within the housing, a rotor mounted on the eccentric shaft which contains at least three intersecting faces and a partial bore located at the intersection of adjacent faces, and at least three hollow rollers rotatably mounted within the partial bores of the rotor.

Abstract: Liquid filtering apparatus includes a plurality of reverse osmosis filters for receiving seriatim under pressure a mixture of feed liquid and recirculated concentrate. Feed liquid such as salt water is introduced into the inlet of each reverse osmosis filter to dilute the recirculated concentrate.

Abstract: A process and installation for the regulation of the vacuum level prevailing in a network of vacuum conduits in a hospital building comprises one or several vacuum pumps connected pneumatically to the vacuum conduits (CV); elements (C2) for determining the pressure to determine the underpressure prevailing in the vacuum conduits (CV); a pilot device (MP) controlling at least one vacuum pump, at least one line for connection to the atmosphere (L1, L2) having a first end connected pneumatically to the vacuum conduits and having a second free end; and control elements (EV1, EV2) for the flow of fluid arranged in the line for connection to the atmosphere (L1, L2) to permit controlling the passage of air in the line connecting to the atmosphere.

Abstract: A fuel tank cap body unit includes a fuel pump portion which is integrated with a fuel filter portion to form a filter-equipped pump. The filter-equipped pump is fixedly contained in a rotary tank having a flat base with which the base of the fuel tank is brought into contact. A fuel tank cap body through which a fuel discharge flow channel portion is passed, is provided. The fuel tank cap body includes a rotary-tank mounting wall, which can be made flexibly movable by a flexible mechanism, and can accommodate the rotary tank and the filter-equipped pump.

Abstract: An apparatus is provided for equalizing pressure between a lubrication fluid for lubricating a pump and a combustion fluid located at a low pressure side of the pump wherein the pump has a rotatable shaft. The apparatus includes a wall defining a bore within the pump wherein a first end of the bore is configured to receive a lubrication fluid and a second end of the bore is configured to receive combustion fluid. An equalizing element is disposed within the bore for separating the lubrication fluid and the combustion fluid and may be at least partially movable in response to pressure differences caused, e.g., by differences in thermal expansion between the lubrication fluid and the combustion fluid.

Abstract: A fluid compressor apparatus includes a compressor for delivering a compressed fluid having a fluid pressure, whereby the compressed fluid includes a volume of liquid entrained in the compressed fluid. The apparatus also includes a prime mover for driving the compressor, the prime mover having an exhaust system which vents high temperature exhaust fluid. The exhaust system includes an exhaust pipe with a first exhaust pipe end and a second exhaust pipe end. A main separator is in fluid communication with the compressor for receiving the compressed fluid and separating the liquid entrained therein from the compressed fluid. The main separator includes an outlet for discharging the compressed fluid after all of the liquid has been substantially removed therefrom.

Abstract: The present invention pertains to the field of jet technology and essentially relates to a pumping-ejection apparatus including a vacuum-producing device. Further, the apparatus is equipped with a condenser, a jet pump and an additional vacuum-producing device which has a boosting liquid-gas ejector, an outlet separator, an additional pump and an additional condenser. The evacuated medium inlet of the jet pump is connected to the separator, the outlet of the jet pump is connected to the suction side of the pump, the inlet of the jet pump for motive medium is connected to the discharge side of the pump. The inlet of the condenser is connected to the ejector's outlet, outlet of the condenser is connected to the separator. The gas inlet of the boosting ejector is connected to the pipe for discharge of compressed gas, the outlet of the boosting ejector is connected to the inlet of the additional condenser.

Abstract: Impure portions such as air bubbles and gelled portions in a liquid are removed so that the liquid can be discharged with improved cleanliness. Under condition that a return flow path and a liquid discharge flow path are closed, a pump chamber is expanded, thereby sucking the liquid in a liquid container portion into a pump chamber through a filter. Under condition that a vent port of the filter and the return flow path are opened and a liquid introducing flow path, the liquid discharge flow path, and a pump inlet flow path are closed, the pump chamber is contracted, thereby returning the liquid in the pump chamber toward the filter so that air in the filter is exhausted to the outside. Under condition that the return flow path and the pump inlet flow path are closed, the pump chamber is contracted, thereby discharging the liquid from the nozzle.

Abstract: A reciprocating compressor apparatus includes a piston and a drive mechanism configured to reciprocate the piston. A housing contains a lubricant for the drive mechanism in a lubricant chamber at one side of the piston. The apparatus further includes a conduit pneumatically communicating the lubricant chamber with an opposite side of the piston, a check valve that prevents flow from the intake plenum to the lubricant chamber, and an inlet valve that acts as a throttling device to reduce the pressure in the inlet plenum.

Abstract: A solvent delivery pump assembly for use in high performance liquid chromatography systems, which accurately delivers a solvent (eluent) drawn from a reservoir, and having removed gases, dissolved in the eluent, and then delivering the eluent as desired for analysis. The apparatus comprises two pump units, each with two plungers of different diameters on a single shaft; one of the plungers in one of the pump unit is of a large diameter size for driving a first pump head in large volume, and the other plunger in the other pump unit is of a smaller diameter for driving a second pump head in small volume.

Abstract: A piston pump for a slip-controlled hydraulic brake system for a vehicle. A tubular filter is mounted on a bush of the piston pump; the filter has a filter ring that forms a guide ring and is spaced apart from the bush and axially guides the piston by a part of the piston that protrudes from the bush. A separate guide ring is dispensed with, and the structural length of the piston pump can be shortened.

Abstract: A rotary-screw air compressor having a separator, a cooler fan assembly, and a mounting apparatus. The separator has a first chamber and a second chamber. The first chamber separates compressed air and coolant. The second chamber separates compressed air and moisture. The separator is disposed in a chasm formed by a first platform. The mounting apparatus elevates a motor and air end vertically above and spatially apart from the separator. A cooler fan assembly is vertically above the motor and air end. The cooler fan assembly has a first heat exchanger vertically above a second heat exchanger. A shroud having an opposite open end is connected to the first heat exchanger at one open end and the shroud is connected to the second heat exchanger at the other open end. A cooler fan is disposed completely within the shroud and between the first and second heat exchangers.

Abstract: A refrigeration unit having a compressor that includes a cast member, a cavity formed in the cast member, and an oil filter element dividing the cavity into an inlet cavity and an outlet cavity. An inlet port for directing the unfiltered oil into the inlet cavity and an outlet port for directing filtered oil out of the outlet cavity are also included. The filter element is secured in the cavity between an integral plate on one end and ears on the opposite end. A seal between the cast member and the removable cover is included. Also included is another seal positioned between the inlet and outlet cavities. The filter element may be cylindrical. At least one isolation valve that prevents or allows flow into and out of the filter cavity may be included. The inlet port may be formed in the cast member and the outlet port may be formed in the removable cover, or vice versa. At least one lubrication point and an oil conduit communicating between the lubrication port and the outlet port are included.

Abstract: A compressor including an airflow manifold located within a compressor housing where the airflow manifold includes a heat exchanger flow connected to a shroud that includes a hopper that terminates in a spout that extends through the bottom compressor housing panel and is located outside the compressor housing to permit particulate matter dislodged from the heat exchanger to be discharged from the compressor housing.

Abstract: A pump which is designed to be mounted within a recirculating water system where a portion of the recirculating water is diverted (bypass water) and cause to flow through the motor chamber with this recirculating water to absorb heat that is produced during the operation of the motor. The heated bypass water is then added back to the recirculating water. The pump includes an electric motor which is mounted within a pump motor chamber of a motor housing and is completely enclosed therein. The pump motor chamber is filled with oil thereby submerging of the electric motor in oil. A water conducting tube is mounted within the pump motor chamber and surrounds the electric motor. The tube inlets water from the pressure side of the pump impeller, conducts this bypass water entirely through the tube and then discharges the bypass water into the inlet of the recirculating water to the pump impeller.

Abstract: A device for metering and measuring quantities of liquid, in particular in a pump for liquid fuels, having a plurality of volume meters, an assigned valve being arranged upstream of each volume meter, and having a liquid supply which branches into individual supply lines opening out into the valves, wherein the valves (5) and the volume meters are assigned to a housing (1, 2, 3) configured in the form of a block, which housing has an inlet opening (4) and supply ducts (6), which branch off from the inlet opening (4) to the valves (5) and form the individual supply lines, a first housing block (1) forming the inlet opening (4) and valve connection openings (8) covered by a respective valve head (7), in which valve connection openings (8) a respective supply duct (6) opens out and from which proceeds a respective connecting duct (10) to the assigned volume meter, which connecting duct can be closed off by a piston (9), a disk, a diaphragm or the like of a valve (5), the volume meters being assigned in each case

Abstract: A pressure gauge of a tire pump includes a chamber communicated with the chamber and a pressure indicator is movably received in the chamber. The pressure indicator has a tube with a head portion attached to a first end thereof and a receptacle defined in a second end thereof. The head portion is in slidable contact with an inner periphery of the chamber and the tube is not in contact with the inner periphery of the chamber. A first rotational member is rotatably mounted to an end wall defining the receptacle of the tube. A second rotational member is rotatably mounted to the end member. A spring has a first end securely attached to the first rotational member to move therewith and a second end securely attached to the second rotational member to rotate therewith. Thus, rotational effect of the spring during movement of the pressure indicator is eliminated to provide accurate tire pressure indication.

Abstract: An improved dual-stage pump system is provided for the accurate pumping and filtering of viscous fluids. Two hydraulically activated pumps are provided in series with a filter and reservoir disposed in-line between the two pumps. The reservoir acts as a source bottle for the second pump and allows the first pump to pump the viscous fluid through the filter at a rate independent of the dispensing rate of the second pump. By operating the first pump at a rate independent of the second pump, back pressure at the filter is avoided. Each hydraulically activated diaphragm pump is equipped with an improved diaphragm that is pre-formed to the geometries of the process fluid cavity thereby eliminating any inaccuracies in the operation of the pumps due to expansion of retraction of the diaphragm during pump operation.

Abstract: A filter for a piston type high-pressure fuel pump is not clogged from freezing even under a hostile condition. The filter is provided in a fuel intake route (26) of a piston type high-pressure fuel pump, and it has many square openings. The length of one side of each opening ranges from 50 &mgr;m to 200 &mgr;m.

Abstract: A compressor includes a compressing mechanism for compressing refrigerant gas and an oil separator for separating the oil from the gas. The separated oil is used to lubricate the compressor. The compressor has a discharge passage to permit refrigerant gas to flow out of the compressor, a recess located in the discharge passage, a plug press fitted in the recess and a supply passage for returning the separated oil to the compressor. The plug and the recess define a separation chamber having a circular cross-section and an annular chamber. The separation chamber is connected with the annular chamber by an outlet passage formed in the plug. The refrigerant gas swirls along the wall of the separation chamber, which separates the oil from the gas. Since the plug is press fitted in the recess, installation of the plug is facilitated. This structure also prevents the plug from loosening.

Abstract: An assembly (10) for pumping fuel from a fuel source to an engine combusting the fuel comprises a housing (14), and a fuel pump (12) mounted in the housing. One end (18) of the housing defines a fuel inlet (20a, 20b) for the pump. A fuel filter (16) is mounted externally of the housing and fuel drawn into the fuel pump flows through the filter. A valve member (22) is fitted onto the end of the housing adjacent the fuel inlet for opening and closing the fuel inlet. The valve member is movable by the fuel filter during its installation to move the valve member to a position at which the fuel inlet is open. Removal of the filter causes the valve member to be moved to a position blocking the fuel inlet. A heater (40a, 40b) is carried on the valve member and is installed adjacent the fuel inlet. The heater heats fuel flowing into the fuel inlet to a predetermined temperature as the fuel is drawn into the fuel pump.

Abstract: A pump includes a housing defining a cavity, at least one bore, a bore inlet, and a bore outlet. The bore extends from the cavity to the outlet and the inlet communicates with the bore at a position between the cavity and the outlet. A crankshaft is mounted in supports and has an eccentric portion disposed in the cavity. The eccentric portion is coupled to a piston so that rotation of the crankshaft reciprocates the piston in the bore between a discharge position an intake position. The bore may be offset from an axis of rotation to reduce bending of the piston during crankshaft rotation. During assembly of the pump, separate parts of the housing can be connected together to facilitate installation of internal pumping components. Also disclosed is a method of reducing vapor lock by mixing vapor and liquid portions of a substance and introducing the mixture into a piston bore.

Abstract: A compression-pumping system for a multiphase fluid (GLR) includes a compression section, a pumping section, a shaft and a separator. The compression section is sealed off from the pumping section, and the pumping section and the compression section are included in the same enclosure and mounted on the same shaft. The compression-pumping system is associated with a liquid level control system situated at the level of the separator.

Abstract: In order to reduce the amount of air trapped in hydraulic assisted steering systems (1), a communication (13, 14) is established between the area of the oil expanding volume (8, 10, 11), which is the top area in the mounted position, and an open system (2), for example a tank volume.

Abstract: A filter head having a pump housing, a flow passage network, and a mounting bracket is adaptable to engage a replaceable filter cartridge. An electric pump is positioned within the pump housing. A Seal/isolator disposed between the pump housing and electric pump protects the electric pump from vibrations. After changing the filter cartridge, typically an air pocket forms creating a danger for a fuel injector or fuel injector pump. By using an electronic controller, an operator may remotely operate the electric pump to prime the filter cartridge. Also, the electronic controller may selectively determine whether the fluid flowing from the filter cartridge passes through the electric pump or instead passes directly into an outlet.

Abstract: A nozzle device for purging a vacuum pump includes a nozzle, the top portion of the nozzle is a tapered portion, two sides of the tapered portion are installed with nozzle holes for guiding the exhausted air sub-flow to be exhausted from the two sides of vent end.

Abstract: A fuel delivery module (10) adaptable for use in a gasoline or diesel fuel tank includes certain common module components for use in both gasoline or diesel fuel delivery applications. The common module components include a support frame (12) having a first cover (14) for closing off an opening of the fuel tank and including a fuel supply port (20) and fuel return port (22) for communication to the engine fuel supply/return system and a second base cover for positioning on a bottom wall of the fuel tank and having a fuel pump-receiving chamber thereon. The base cover (30) includes a first diesel fuel pick-up opening (44) that can be communicated to the fuel supply port on the first cover by a suitable diesel fuel supply conduit when the fuel tank contains diesel fuel.

Abstract: A wet gas compression device combining the following stages: a separation stage providing a gas phase and a liquid phase; a conversion stage for converting a gas phase and a liquid phase; a conversion stage for converting the liquid phase provided by the separation stage to a vapor phase by heat exchange; a compression stage for compressing the gases from the separation stage and the conversion stage and for providing a portion of gas for use in the heat exchange of the compression stage.

Abstract: A pumping system and method according to which a plurality of housings are connected together, with each having an inlet and an outlet for respectively receiving and discharging the liquid to be pumped. A single shaft is driven by a motor and extends though all of the housings, and a plurality of rotors are respectively disposed in the housings and are connected to the shaft for rotation therewith. When the shaft is rotated, the rotors pump liquid passing into their corresponding housings from its inlet, through the housing and out its outlet.

Abstract: A method and apparatus for separating entrained gases from a pumped fluid. A degas pipe having an increased inner dimension relative to surrounding process piping is provided to generate a stratified two-phase gas/liquid flow. A controlled release mechanism permits selective removal of gas from the degas pipe.

Abstract: An air purging circulator is provided with a reservoir on the suction side of an impeller chamber in a circulation pump, to allow circulating water to reduce its velocity, and remove air from the lowest pressure point in the system, the suction side of the circulator, where the least amount of dissolved air is present in the circulating water, so that entrained air in the water is released, and vented from the system. The flanged inlet and outlet apertures of the pump housing are axially aligned, and preferably are located at one end of the pump housing opposite from the motor, to allow convenient installation in retrofit of existing systems. Separation media, such as marbles, wire mesh, or crumpled wire, to further slow the water flow and enhance separation of the air from the water, can be provided in the reservoir.

Abstract: In open drive refrigerant compressors, the location where the shaft extends through the casing provides a potential location for leakage of refrigerant. Where a shaft seal is used which requires an oil seal, the draining of oil from the shaft seal cavity, upon stopping the compressor, is prevented by placing a check valve downstream of the shaft seal cavity which forms a part of the oil distribution system. An optional check valve may be located upstream of the shaft seal cavity.