Abstract: A method for producing a rubber member according to the present invention includes the steps of: supplying a rubber composition to a cylinder provided in an extruder; extruding the rubber composition to a downstream side of the cylinder while kneading the rubber composition in an internal space of the cylinder that includes a plurality of protruding members protruding from an inner wall surface of the cylinder; compressing the rubber composition at least once in the step of extruding the rubber composition to the downstream side; discharging a gas generated from the compressed rubber composition to outside of the cylinder; discharging, through a discharge outlet of the cylinder, the rubber composition after the gas has been generated; and molding the rubber composition that has been discharged through the discharge outlet into a predetermined rubber member shape.

Abstract: An external gear pump includes a pump housing in which a pump chamber is formed, a primary gear having a plurality of external teeth housed in the pump chamber, a secondary gear having a plurality of external teeth that mesh with the plurality of external teeth of the primary gear in the pump chamber, a first electric motor configured to generate a torque for rotationally driving the primary gear, a second electric motor configured to generate a torque for rotationally driving the secondary gear, and a control unit configured to control the first and second electric motors. The control unit controls the first and second electric motors so that the torque generated by the first electric motor is greater than the torque generated by the second electric motor.

Abstract: Process and device for pneumatically conveying a powdery material comprising the steps of Pneumatically conveying a powdery material in a pneumatic conveying pipeline (first) and into said recipient by a flow generated by a blower, A powdery material dosing step, A fluctuation step of pressure drop in said pneumatic conveying pipeline or up to said recipient, wherein a sonic device generates sonic waves inside said pneumatic conveying pipeline or up to said recipient and provides a counteraction on the fluctuation step of the pressure drop in said pneumatic conveying pipeline or up to said recipient.

Abstract: A drive device includes a housing forming a sump. A pump and motor are mounted on a center section having a porting system and a pair of ports with check plugs disposed therein. A bypass arm is engaged to one end of a bypass shaft external to the housing and rotates the bypass shaft to selectively cause engagement fingers to move each check plug to an open position. A housing projection is contacted by the bypass arm to selectively limit rotation thereof. The axes of rotation of a swash plate trunnion shaft, a pump input shaft and a motor output shaft may all be disposed in a single plane. The input shaft is supported by a housing bearing and an opening in the center section and is restrained from axial movement by the bearing and a thrust surface on the center section.

Abstract: A subsea pump is used in applications such as deep-water boosting of fluid produced from a wellbore. The process pressure variation is mostly related to the pump suction side in such applications. The barrier fluid system for the pump regulates its pressure according to the pump discharge pressure. A balance piston is positioned in a location close to the pump inlet such that both mechanical seals are exposed to the pump discharge pressure on the process side.

Abstract: The invention relates to a high pressure pump for a fuel injection system, in particular a common rail injection system, comprising a housing part (1) with a bore (2), in which a pump piston (3) is received such that it can be moved with a reciprocating movement, which pump piston (3) is supported via a tappet assembly (4) on a cam (5) or eccentric and delimits a pump working chamber (6) in the axial direction, which pump working chamber (6) can be filled with fuel via an upstroke valve (7) which is integrated into the high pressure pump. According to the invention, a feed bore (8) is configured in the housing part (1) in order to supply the upstroke valve (7) with fuel, which feed bore (8) is connected to a bore (11) of a further housing part (12), which bore (11) connects a pump interior chamber (9) and a tappet chamber (10).

Abstract: A crucible device comprises a crucible body configured to store evaporation material, with an opening disposed therein; a crucible cover which matches the opening of the crucible body and which forms a hermetic space in cooperation with the crucible body when being in a closed state and opens the opening of the crucible body when being in an open state; a driving mechanism comprising a housing with a cavity therein and a piston disposed within the cavity, the cavity being divided by the piston into a closed chamber and an open chamber by the piston, the open chamber being in communication with outside of the cavity through a cavity opening of the cavity, the closed chamber storing gas therein, the piston being connected with the crucible cover by a transmission mechanism, the piston being moved within the cavity in accordance with change of pressure in the open chamber, thereby driving the crucible cover to switch between the open state and the closed state.

Abstract: A conveying unit for conveying reducing agent from a tank to an exhaust gas treatment device for treating the exhaust gases from an internal combustion engine, includes a pump having a drive or drive unit and a pump chamber unit or containment. The pump chamber unit or containment at least partly delimits a pump chamber and the drive or drive unit and the pump chamber unit or containment are detachable from one another.

Abstract: A method can include selecting a ratio of a first effective cross-sectional area of a first component of a gas lift valve to a second effective cross-sectional area of a second component of the gas lift valve; charging a chamber of the gas lift valve; and positioning the gas lift valve in a pocket to expose the gas lift valve to a tubing pressure and a casing pressure, where transitioning of the gas lift valve from a closed state to an open state depends at least in part on the selected ratio. Various other apparatuses, systems, methods, etc., are also disclosed.

Abstract: A machine (12, 13) for painting small three-dimensional objects (2) comprises a plurality of spindles (9) equipped with holders (10) for objects (2) to be painted. A unit (15) able to rotate about an axis (16) is equipped with a plurality of seats (17) structured to receive a spindle (9). The spindle (9) is removably associable with said seat (17). An airless painting device (25) is operatively positioned at a painting station (26) designed to receive said seats (17) in sequence. First actuator means (27) drive the rotation about a painting axis (18) at least of the holder (10) when the seat is positioned at the painting station (26). Means (29) for transferring the objects (2) grip a spindle (9) positioned along a transfer line (3) and place it in one of the seats (17) and/or vice versa.

Abstract: A high-pressure fuel pump device of the invention includes a plunger-type high-pressure pump unit (31) configured to pressurize fuel as a plunger (43) thereof makes reciprocating motion, a diaphragm-type supply pump unit (33) configured to suck in fuel in a fuel tank (11) and supply the fuel to the high-pressure pump unit as a diaphragm (87) thereof oscillates in conjunction with the reciprocating motion of the plunger, and a fuel return unit (34) provided in the supply pump unit and configured to return, to the fuel tank, surplus fuel that is not sucked into the high-pressure pump unit.

Abstract: A fuel system for a vehicle engine. The fuel system includes a fuel vessel and a surge tank that is housed within the fuel vessel. One or more injectors inject fuel into the engine from the surge tank. The surge tank includes a lift pump that draws fuel from the fuel vessel into the surge tank. The fuel system also includes a connector line that connects the one or more injectors to the surge tank.

Abstract: The invention relates to a separable device for the application of compression and thermal therapy to a patient. A first section includes a reservoir, liquid pump and a thermal exchange system for the application of thermal therapy as well as a dock. The second section of the device includes an air compressor and at least one controller for the application of compression therapy and can be operated independently from the first section. Additionally, the second section may be engaged with a dock of the first section.

Abstract: Example fluid circuits (e.g., within aircrafts) include first and second pump assemblies. The first pump assembly has an electric motor and a first fluid pump. The first fluid pump is coupled to the electric motor and has a case drain port that is in fluid communication with a case drain region of the first fluid pump. The second pump assembly is powered by hydraulic pressure from the first fluid outlet of the first fluid pump and functions to augment flow through the case drain region of the first fluid pump.

Abstract: An improved system for providing fuel uses a centrifugal pump arrangement that provides dual pressure. The dual pressure pump assembly includes a centrifugal pump for supplying pressurized fluid to an associated downstream use, and an auxiliary pump stage for selectively boosting pressure of delivered flow. The auxiliary pump stage in one preferred arrangement includes a start and turbo-pump stage where inlet fuel from an associated airframe is fed to a centrifugal pump portion of the turbo-pump that outlets to an inlet of the centrifugal pump. The auxiliary pump stage in another arrangement includes a recirculation passage communicating with the outlet of the high-speed centrifugal pump and the turbine, and the outlets from the start and turbo-pump stage feed an inlet of the high speed centrifugal pump, and a flow valve is disposed in the recirculation passage. In still another arrangement, the auxiliary pump stage includes an electric motor for start-up.

Abstract: A pumping device for pumping a liquid to a higher level comprises a pump having an inlet and an outlet, an inlet tube being located upstream of the inlet for guiding the fluid to the inlet, a siphon being located downstream of the outlet and an outlet tube being located downstream of the siphon for guiding the liquid from the outlet to the outlet tube via the siphon. The outlet tube extends at least beyond a front side of the pump as seen from the pump. With respect to the outlet tube the siphon extends at least partly at the opposite side of the front side.

Abstract: A brake actuator has a motor that provides input rotation in first and second directions. A reducer couples to the motor and reduces the input rotation into an output rotation to be applied to a brake screw of a progressive cavity pump drive. A sensor measures rotational speed of the drive shaft. In manual operation, an operator can view an indication of the rotational speed and can manually operate the motor accordingly to control rotation of the shaft. In automated operation, a controller automatically controls the motor based on the rotational speed measured by the sensor. The controller can also use a torque sensor to detect the torque applied to the brake screw, a displacement sensor to detect displacement of the brake screw, and/or a current sensor to detect the current consumption of the motor.

Abstract: A pumping system for evacuating gas from a plurality of chambers, includes at least one turbomolecular pump, at least two fore-vacuum pumps, at least one connection conduit extending between the at least two fore-vacuum pumps. and at least one transverse constriction for at least one of reducing and regulating gas flow.

Abstract: The present invention claims a vertical self-priming pump which comprises a pump body, a motor and a medium backflow blocking device, wherein a middle partition plate is provided inside the pump body, and a flow guide body is fixed on the middle partition plate; the motor is fixed on the pump body for driving a pump shaft to rotate; and an impeller that is arranged in the flow guide body is fixed on the lower end of the pump shaft; a backflow gap channel is formed between the outer circumferential surface of the impeller and the inner wall of the flow guide body; and the medium backflow blocking device comprises a static ring and a moving ring which are vertically and oppositely arranged, and an elastic supporting sleeve; the moving ring is embedded on the upper surface of the impeller, the elastic supporting sleeve is fixed on the upper surface of the flow guide body, and the static ring is embedded on the lower surface of an elastic supporting ring.

Abstract: An integrated compressor and pump unit suitable for installation on a vehicle and draw rotary power from a power source of the vehicle. The unit includes a compressor unit and a separate pump unit. The compressor unit has a rotary input shaft coupled to a rotary compressing device of the compressor unit. The pump unit is mounted to the compressor unit and has a rotary input shaft coupled to a rotary pumping device of the pump unit. The pump unit is secured to the compressor unit and rotary motion is transferred from the rotary input shaft of the compressor unit to the rotary input shaft of the pump unit such that the rotary compressing and rotary pumping devices operate in unison and in series.

Abstract: A coolant pump for an engine with a controllable coolant flow, including a pump housing in which a hollow pump shaft is rotatably supported with an associated impeller. A volume flow of the pump is influenced by a guide plate allocated to the impeller. The guide plate is rotationally locked to a push rod guided in the pump shaft and continuously variable between two axial end positions via an actuator, provided as a radial piston pump integrated within the coolant pump that is adjustable by a cam and includes, for generating pressure, a piston that is enclosed on the outside by the cam and guided in the radial direction in a bore of the pump shaft and allocated to a pressure space. The pressure space is connected indirectly to a high pressure space in which a high pressure piston applying a force on the push rod is displaceably guided.

Abstract: A system has a compressor and a consumer which are coupled to a drivetrain and extract energy through the drivetrain. The consumer is suitable for varying an absorption of power, which is made available to it by the drivetrain, as a function of a power which is required for compressor operation and which is supplied from the drivetrain to the compressor. A pump has at least one pump chamber which generates a pumping power during pumping operation. The pump additionally has at least one pump chamber which generates no pumping power or a reduced pumping power during pumping operation.

Abstract: A subsea compression station is provided. The subsea compression station comprises a separator, a compressor configured to compress and discharge gas separated from a well stream ingested into the separator, a pump configured to pump liquid separated from the well stream, and an electrical motor drivingly connected to a compressor rotor comprising a compressor rotor shaft connectable to a pump rotor through a speed reduction device, wherein the speed reduction device is configured to bring the pump rotor in co-rotation with the compressor rotor at a reduced speed.

Abstract: An apparatus and method for supplying natural gas from a well operating under vacuum conditions by extracting, storing and communicating it to a natural gas-fired piece of oil field equipment is provided. The apparatus has a pump associated with a pump jack for extracting natural gas. The apparatus communicates natural gas to a volume tank and stores it until it needed by a natural gas-fired piece of oil field equipment.

Abstract: The present invention provides a vacuum pump (10) which comprises a turbo-molecular pumping mechanism (12) in series with a Siegbahn pumping mechanism (14). A first pump inlet (16) is provided through which gas can pass through both the turbo-molecular pumping mechanism and the Siegbahn pumping mechanism. Additionally, an inter-stage (inlet 18) is provided through which gas can enter the pump at a location between the turbo-molecular pumping mechanism and the Siegbahn pumping mechanism and pass only through the Siegbahn pumping mechanism. There are flow channels (52, 62) in a first plurality of stages (32, 34) of the Siegbahn pumping mechanism which are in fluid communication with the inter-stage inlet (18) and gas entering the pump through the inter-stage inlet is pumped in parallel along said flow channels.

Abstract: A combination compressor and vacuum pump apparatus comprising a common drive mechanism, a compressor piston-cylinder unit mechanically coupled to the drive mechanism, the compressor piston-cylinder unit comprising a hollow first piston rod connected to the drive mechanism at a first free end substantially opposite a first piston operable within a first cylinder so as to form the compressor piston-cylinder unit, and a vacuum pump piston-cylinder unit mechanically coupled to the drive mechanism, the vacuum pump piston-cylinder unit comprising a hollow second piston rod connected to the drive mechanism at a second free end substantially opposite a second piston operable within a second cylinder so as to form the vacuum pump piston-cylinder unit, whereby air is pulled into the compressor piston-cylinder unit through the first piston rod for compression therein and air is exhausted from the vacuum pump piston-cylinder unit through the second piston rod.

Abstract: A foam pump including a diaphragm made of a flexible material defining a mixing chamber and having an inlet and an outlet. An inlet passageway, having a one-way valve therein, is in fluid communication with a reservoir containing a foamable liquid and the inlet. The inlet passageway includes an air inlet and associated one-way valve. The pump includes an outlet passageway, having a one-way valve therein, in fluid communication with the outlet. The foam pump includes an electric motor. that drives a motor driven element to collapse and expand the diaphragm. Expansion of the diaphragm creates a vacuum causing foamable liquid and air to flow into the mixing chamber. Collapsing of the diaphragm causes the liquid and air mixture to be forced out as foam.

Abstract: In order to ventilate a centrifugal pump (1) having a centrifugal pump outlet space (6) and a centrifugal pump suction space (4), as well as having an additional ventilation pump (3), preferably configured as a vacuum pump, having a ventilation pump inlet (14) and a ventilation pump outlet (15), which pump has a particularly simple structure and which can automatically ventilate itself, if necessary, without any complicate switching processes, it is proposed that both the ventilation pump inlet (14) and the ventilation pump outlet (15) are connected with the centrifugal pump outlet space (6) by way of a connection line (16, 17), in each instance, forming a secondary line.

Abstract: An air conditioning unit designed for a rescue shelter in a mine. The present invention utilizes compressed gas to power a pneumatic piston system that is able to covert the linear forces from the pistons into rotational forces. The present invention utilizes a swash plate unit to translate linear motion into rotation motion to power a conventional air conditioning system.

Abstract: A hybrid vehicle has an internal combustion engine (10) and a hybrid drive (12) that has an electric machine (11) and a transmission (13) having a drive output. During driving under purely internal combustion engine (10) power, only the internal combustion engine provides a drive torque at the drive output. During driving under purely electric motor power, only the electric machine (11) provides a drive torque at the drive output. During hybrid driving, the internal combustion engine (10) and the electric machine (11) each provide a drive torque at the drive output. The hybrid vehicle also has a pump unit (16, 20). The pump unit (16, 20) can be driven by the electric machine (11) of the hybrid drive (12).

Abstract: A fuel system of a vehicle that delivers fuel to an engine includes a fuel tank, a main fuel pump that pumps fuel to the engine, and a fuel supply line through which fuel flows from the fuel tank to the main fuel pump. Moreover, the fuel system includes a boost pump assembly providing variable pumping of fuel from the fuel tank to the fuel supply line toward the engine.

Abstract: A high pressure mister cooling system having an electric fan, a high pressure pump mounted on the fan, an eccentric on the fan motor shaft, and mister nozzles mounted on the fan guard. A pump shaft is reciprocated by the eccentric when the fan is operated. A pump body includes a pump piston and bore, an inlet valve that opens when supply pressure exceeds 20 psi, a pump outlet valve that opens when pump pressure exceeds 120 pounds, and a pressure limiting valve that opens when pump pressure exceeds 1000 pounds. Water flows only when an inlet supply is attached and the fan is operating, and outlet pressure to the mister nozzles is controlled at about 1000 psi.

Abstract: Flood water removal systems including a motor, a vacuum generating device, a discharge pump, and a vacuum tank can be efficiently arranged to be transversely mounted to a vehicle. Certain flood water removal systems can include a supercharger driven by the engine to generate vacuum. The systems can include a valve to prevent collapse of a vacuum tank and maintain a predetermined vacuum pressure without varying the speed of the motor. The systems can also include a two-stage exhaust that blends exhaust from the blower with motor exhaust in a silencer to reduce noise generation for operation in residential or other noise-sensitive settings. The systems can also include a vacuum tank comprising a noise reduction baffle to further reduce noise generation.

Abstract: Disclosed is a variable capacity type rotary compressor, in which a refrigerant sucked via one suction pipe can be alternately sucked into each compression space via a communication passage between a plurality of cylinders so as to reduce the number of components and the number of assembly processes, thereby remarkably reducing a fabricating cost, a refrigerant within an idling cylinder can be prevented from flowing back into another cylinder so as to improve the performance of the compressor, a welding space can be ensured when connecting connection pipes so as to realize a welding automation, thereby further reducing the fabricating cost, and a mode switching valve can be stably fixed to an appropriate position so as to attenuate noise due to vibration of the compressor.

Abstract: A control apparatus for controlling two oil pumps which are provided on a vehicle wherein the two oil pumps are selectively driven by respective different drive power sources such that one of the two oil pumps is operated while the other oil pump is held at rest, the control apparatus including an air removal control portion configured to temporarily operate the above-indicated other oil pump during an operation of the above-indicated one oil pump, to remove air staying at and around an oil inlet of the above-indicated other oil pump.

Abstract: The present invention relates to a split stream oilfield pumping system which utilizes recycled high Reid vapor pressure production fluids. The oilfield system is made up of two separate fluid streams: a first recycled fluid stream and a second new fluid stream. The recycled fluid stream is enclosed to reduce or eliminate vaporization of the recycled fluid, which typically will have a Reid vapor pressure >14 kPa. Wellbore treatment additives are added to the new fluid stream, and the resultant treatment fluid is mixed with the recycled fluid in a common manifold to provide a final wellbore treatment fluid to be delivered to the wellhead.

Abstract: A fast fill pump system for a self-propelled field sprayer includes high capacity centrifugal pump for tank filling. The centrifugal pump is connected in parallel with the fill connection and primed by a lower capacity diaphragm spraying pump. Two check valves and a pressure sensor allow the sprayer control to automatically control the pump priming and tank filling with the activation of one switch. The two-pump system preserves tank filling speed, even during operation of eductor or tank agitation functions. The centrifugal pump can be removed and the spraying pump operated to fill the tank without substantial base machine modification.

Abstract: A combined canned motor-pump operates directly in the process fluid without the need for shaft seals or buffer or lubricating fluids. The pump incorporates an integral gas-separating system that includes gas separating hydraulics and a flow path that returns the gas to the main gas/oil separator. The gas-separating system includes a pump inlet for accepting incoming multiphase flow, at least one blade rotatable about the axis of rotation, an open annulus region for separating gas from liquid in the multiphase flow, at least one radial hole in the shaft for directing separated gas to the axial hole, and a pump outlet for discharging liquid from the pump.

Abstract: Disclosed is a dry vacuum pump for evacuating a processing chamber in a semiconductor or display manufacturing device, or for evacuating gaseous substance and/or byproducts generated in the process chamber. The dry vacuum pump does not need a partition wall between the roots rotor and the screw rotor. A space is formed at the under sides of the roots rotor and the screw rotor to contain the object substance therein.

Abstract: The invention relates to a pump unit (1) with a main pump (4) and a charging pump (5) with a variable pump capacity. A lifting ring (23) is provided for varying the capacity of the charging pump (5). A regulating power, which depends on the inlet pressure of the main pump (4), acts on the lifting ring (23).

Abstract: A fuel pumping system comprises a high pressure pump having a drive input, a drive gear driven for rotation, in use, by the drive input, an idler gear driven by the drive gear, and an output gear driven by the idler gear, wherein the output gear is arranged to drive a rotor of an electrical generator and the idler gear is arranged to drive a rotor of a low pressure pump.

Abstract: A method for the high-pressure delivery of a mixture comprises delivering at least first and second fluids. The method comprises operations consisting in forming a mixture of fluids in a mixing zone having a pressure that is less than the desired high pressure and bringing the pre-mixed fluids to the high pressure. The first fluid is introduced into the mixing zone by a pumping operation that is performed by a high-pressure pump that is positioned downstream of the mixing zone. A device for performing the method is described.

Abstract: Transfer pump for high-pressure petrol injection of the type comprising a piston (1) which delivers oil into a deformable element such as a bellows (8), the deformations of said bellows (8) in a cylindrical chamber (6) filled with fuel causing a pumping effect whereby said fuel is pumped towards a rail (40) supplying high-pressure injectors, wherein means are arranged for diverting some or all of the oil pumped by the piston (1) towards a chamber (15) without pressuring it so as to determine at will the useful stroke of said piston (1) and hence the quantity of fuel pumped at high pressure towards the rail (40).

Abstract: A portable pumping apparatus for concurrently pumping liquid from a source container to a destination container and pumping vapor from the destination container to the source container comprises a liquid and vapor pump having a liquid inlet, a liquid outlet, a vapor inlet and a vapor outlet. There is a selectively controllable actuation mechanism for actuating the liquid and vapor pump to thereby concurrently pump liquid from the liquid and vapor pump through the liquid outlet and vapor into the liquid and vapor pump through the vapor inlet, and concurrently pump vapor from the liquid and vapor pump through the vapor outlet and liquid into the liquid and vapor pump through the liquid inlet.

Abstract: An energy efficient oxygen concentrator for filling high pressure portable cylinders with medical oxygen for use by ambulatory patients. Two compressors provide two pressurized air sources, one for operating an oxygen concentrator to provide a stream of oxygen enriched gas, and the other for driving a pressure intensifier for filling portable oxygen cylinders. Pressurized exhaust from the pressure intensifier is returned to the inlet side of at least one of the compressors for reducing the energy required to drive the compressor. Preferably, each compressor has a single reciprocating piston, a single motor drives both pistons and the pressurized exhaust from pressure intensifier is provided to the inlets for both compressors.

Abstract: A compressor station having at least one primary compressor and a booster compressor is controlled to conserve energy and air, and to respond quickly to sudden changes in demand for air, by employing a volume bottle to buffer changes in air pressure and by recycling already compressed air from the intake to the output of the booster compressor. The system may be used in air drilling and to provide compressed air for generating low density drilling fluid on site by injecting microbubbles into a base drilling fluid. Two different methods of generating microbubbles are illustrated. The primary and booster compressors are kept in a state of readiness during drill pipe connection time, providing for a rapid resumption of pressure and air flow after connection is completed. The system can utilize gases other than air.

Abstract: Gas compression system comprising a compression cylinder having a gas inlet, a compressed gas outlet, and one or more liquid transfer ports; a pump having a suction and a discharge; and a compressor liquid. The system also includes any of the following: a pressure intensifier having an inlet in flow communication with the pump and an outlet in flow communication with the compression cylinder; a feed eductor in flow communication with the discharge of the pump, with a reservoir containing a portion of the compressor liquid, and with the compression cylinder; a drain eductor in flow communication with the discharge of the pump, with the compression cylinder, and with a reservoir containing a portion of the compressor liquid; and a variable-volume compressor liquid accumulator in flow communication with the discharge of the pump.

Abstract: The present invention is directed to a Universal Pumping Platform (UPP) that comprises a platform containing an electric motor that drives a hydraulic pump for producing high pressure hydraulic fluid and one or more pumps powered by the hydraulic fluid from the hydraulic pump. The pump is selected for the desired commissioning method to be carried out, such as filling, chemical treating, pigging, hydrostatic testing or dewatering the pipeline. The UPP is suspended from a vessel by an umbilical that provides the electric current for the electric motor supported by the UPP.

Abstract: A high pressure mister cooling system comprising an electric fan, a high pressure pump mounted on the fan, an eccentric on the fan motor shaft, and mister nozzles mounted on the fan guard. A pump shaft is reciprocated by the eccentric when the fan is operated. A pump body includes a pump piston and bore, an inlet valve that opens when supply pressure exceeds 20 psi, a pump outlet valve that opens when pump pressure exceeds 120 pounds, and a pressure limiting valve that opens when pump pressure exceeds 1000 pounds. Water flows only when an inlet supply is attached and the fan is operating, and outlet pressure to the mister nozzles is controlled at about 1000 psi.

Abstract: A pump apparatus is provided which comprises a first displacement pump and a ceramic valve construction formed of a ceramic rotor, a ceramic stator having flat surfaces which are positioned in sealing relationship and a second displacement pump having check valves. The first displacement pump comprises a reciprocating first piston within a housing having an interior wall spaced apart from the piston. The position of the first piston and the position of the rotor are controlled to effect desired fluid flow through the stator. The first piston and a second piston of the second displacement pump are reciprocated by a common motor.