Abstract: A magnetostrictive pump is provided which makes use of a magnetostrictive element which, when an alternating magnetic field is applied to it, compresses a chamber containing a working fluid. A bellows located within the working fluid is repeatedly compressed by the compression of the chamber, and pumps a fluid to be pumped in and out of the bellows. Since the magnetostrictive element does not directly contact the bellows, the bellows life is greatly extended. Valves are provided to direct the fluid flow in a desired manner. The pump may be combined with other pumps in various series or parallel arrangements to create a pump system. The pump may be pre-biased to make its response more linear by either mechanical or magnetic biasing. A permanent magnet may be used to magnetically bias the pump and create an "at-rest" initial extension of the magnetostrictive element. Similarly, a spring may be used to mechanically load the magnetostrictive element.

Abstract: A pumping system for continuously delivering fluid at a selected flow rate to a receiving system. The system includes at least a first and a second pumping unit, each of the individual units comprises a syringe and a valve. The syringe comprises a piston and a piston actuator, cylinder, and pressure sensor. The valve comprises a positively-actuated zero switching volume valve and valve actuator. The first and second pumping units are in fluid communication with one another and are capable of independent actuation. The individual valves are arranged to isolate either the first syringe or the second syringe, respectively, from the receiving system while at least one of the syringes remains in fluid communication with the receiving system whereby system pressure can be continuously monitored and the selected system flow rate maintained.

Abstract: An arrangement for regulating fluid conditioning stations including a plurality of pumping devices, at least one fluid storage reservoir, at least one pressure transducer and regulating mechanism, the conditioning station providing a fluid at a certain pressure and flow for consumption. The pumping devices start and stop such that the pressure in the fluid storage reservoir or reservoirs is maintained between two limit values of pressure (the start pressure and the stop pressure). Only one pumping device is started when the pressure in the storage reservoir(s) reaches or exceeds the value of the start pressure or when the flow provided by the pumping devices in operation is less than the consumption flow. Only one pumping device is stopped when the pressure in the storage reservoir(s) reaches the value of the stop pressure or when the flow provided by the pumping devices in operation is greater than the consumption flow.

Abstract: A system for controlling the operation of a turbo-type fluid machine driven by a variable speed prime mover, which enables the characteristics of the fluid machine to be improved so as to become favorable for actual use while allowing the prime mover to exhibit its capacity to the maximum even at an operating point other than the rated point. The operation control system includes a turbo-type fluid machine driven by a driving machine, and a device for detecting an operating head or operating pressure of the fluid machine.

Abstract: An infusion apparatus having a pump powered by a source of battery power and a controller that performs a plurality of processing tasks related to the pumping of liquid through a conduit. The controller is operable in a normal mode of operation utilizing a first rate of power consumption from the source of battery power. The infusion apparatus includes control means for causing the controller to operate in a first power-saving mode of operation utilizing a second rate of power consumption, the second rate of power consumption being lower than the first rate of power consumption, and the control means causes the controller to operate in a second power-saving mode of operation utilizing a third rate of power consumption, the third rate of power consumption being lower than the first rate of power consumption.

Abstract: A vacuum system and a method of operating a vacuum system. The system comprises a vacuum line, a pump, a pump motor, a pressure adjusting assembly, a pressure sensor and a control device. The pump is connected to the vacuum line for drawing fluids therefrom, and the motor is connected to the pump to drive the pump. The pressure adjusting assembly is connected to the vacuum line for conducting fluid into that line at an adjustable rate. The pressure sensor is connected to the vacuum line to generate a pressure signal representing the pressure in the vacuum line. The control device receives the pressure signal and generates a system control signal that is used to adjust the pressure in the vacuum line. The specific manner in which the pressure in the vacuum line is adjusted depends on the value of that pressure, and in particular, whether that pressure is in a first range or a second range.

Abstract: A pump overload control assembly is for use with an electric motor driven pump in a water pumping system. The assembly includes a pump overload control device coupled to a fluid responsive switch, thereby forming a pump overload control circuit that interrupts the current flow to the motor in response to an overload of current flow to the motor. The pump overload control device includes a resettable overload protector and indicator mechanism that visually indicates when an overload has occurred and breaks the current flow through the circuit, for example, in response to heat generated from the overload current flow. The fluid responsive switch opens and closes the circuit in response to the fluid being pumped to an external source, for example, when the fluid pressure level falls below or rises above a predetermined pressure level.

Abstract: A positive displacement rotary axial screw pump which comprises a series of sealed closures formed by meshing of the rotors for building the internal pressure gradient of the pump from the pump inlet to its outlet. A programmable logic circuit is provided for signaling impending abnormal pressure conditions in the pump and, upon the onset of such conditions, modifying pump operation to compensate for the abnormal conditions. A pressure monitoring device detects selected disruption in the normal pressure gradient of the pump indicative of the impending abnormal conditions and signals the logic circuit of the impending conditions. The pressure monitoring device includes a pressure sensing device associated with at least one isolated volume for sensing internal pressure gradients of the pump.

Abstract: This disclosure relates to a liquid supply system including a motor-pump unit designed for installation in a liquid supply such as a well or storage tank. The unit supplies the liquid to a supply pipe, and a pressure sensor connected to the pipe is operable to provide a control signal representative of the liquid pressure in the pipe. The motor is a variable-speed AC motor. A control for the motor is responsive to the control signal and actuates a power circuit to drive the motor at a speed adjusted to maintain the liquid pressure at a substantially constant value. The control circuit further includes means for turning off the power to the motor in the absence of flow through pipe, which does not require a flow sensor. The power circuit comprises a DC link including a rectifier and an inverter. The rectifier is located adjacent the pressure sensor; the inverter may be located adjacent the rectifier and the pressure sensor or in the casing of the motor-pump unit.

Abstract: The fluid pump has a casing defining an inlet manifold, an outlet manifold and a plurality of piston chambers between the inlet manifold and the outlet manifold, each piston chamber having a piston therein for drawing fluid into the piston chamber from the inlet manifold and for pumping fluid out of the piston chamber into the outlet manifold, and a spring biased check valve associated with each piston chamber wherein a spring biases each valve toward the piston chamber and seals the piston chamber from the outlet manifold, the improvement comprises: at least one of the check valves having a hole therethrough which provides open communication between the outlet manifold and the piston chamber, blocking and sealing structure associated with the check valve for blocking and sealing the opening, and a mechanism for moving the blocking and sealing structure between a first position wherein the hole is blocked and sealed and a second position whereby the hole is not blocked or sealed, such that when the blocking a

Abstract: A pump control and protection system comprised of an analog module and a digital module. The analog module includes a synchronous phase detector, a pressure transducer and an over voltage/under voltage circuit. The synchronous phase detector determines the phase angle between a current signal supplied to a water pump and a voltage signal supplied to the pump. The output of the phase detector is directed to a programmable array logic device in the digital module and used to activate a solid state relay that controls the power supplied to the pump. The water pressure in the system is displayed on a digital display.

Abstract: A compressor cylinder discharge valve is adapted for monitoring of internal pressure and performance by tapping through the center bolt thereof to obtain pressure values.

Abstract: A real time remote sensing pressure control system is provided which uses periodically sampled remote sensors to generate a bias signal that modifies the base setpoint of a proportional-integral controller that controls variable speed pumps. This control scheme saves energy by slowing the rotational speed of the variable-speed secondary pumps during periods of light system demand. The system can be provided with more than one zone of system loads (such as chilled or hot water coils) and a remote pressure sensor (gauge or differential) can be provided at each of those zones. In addition, a local pressure sensor (gauge or differential) is provided at the primary and secondary pumps. The process variable signals detected by the remote pressure sensors is communicated by a building automation system or other type of data highway, which inherently delays the real time nature of those sensed signals and only periodically provides an update of those signals.

Abstract: A hydraulic pressure booster device suited for increasing in-line fluid pressures comprises the assembly of a vertically oriented, tubular, closed end, housing for a submersible fluid pump. The pump is secured to a cap flange which closes the top of the tubular housing, while the bottom of the tubular housing is closed with either an anchor plate or blind end cap. Compression seal fittings are used to seal the penetration of pump motor pump lead wires through the cap flange. Inlet flow received into the tubular housing is drawn through the submersible pump with a resultant increase in hydraulic pressure at the output. A housing pressure sensing switch interrupts pump operation to prevent pump damage during periods of low fluid level in the housing. Additional pump protection is provided via a pump outlet pressure monitoring switch which regulates the pump delivery pressure. Dimensional design features of the device enhance useability and maintainability.

Abstract: A pressure washer is provided with a flow control switch and a bypass passage. The flow control switch shuts the motor of the pressure washer off when fluid is not being supplied to the pressure washer or when the spray gun of the pressure washer is closed. The bypass passage relieves excess outlet pressure and activates the flow control switch when the spray gun is closed. The pressure washer may include a soap pump for injecting soap into low pressure fluid at the inlet of the pressure washer.

Abstract: An electric steam iron comprises a pump (20) adapted to remove a quantity of water from a reservoir (17) and to send this quantity, via a selection device (24), either into a steam chamber (14) so as to obtain abruptly an abundant emission of steam through holes in the sole, or to a cold water spray (25), this pump being of the type having a piston (27) movable in an intake chamber (31). The selection device comprises a deformable membrane (56) with two valves (58, 59) associated respectively with two openings, namely an injection opening (44) connected to the steam chamber (14) and a spray opening (45) connected to the spray chamber (25) and subjected respectively to two manual control buttons, namely, a steam button (62) and a spray button (63).

Abstract: A fluid flow delivery system switches a variable speed pump drive among a plurality of pumps. The remaining pumps can be operated as constant speed pumps and can be energized one at a time in response to increasing demand. The pump associated with the variable speed drive can be operated over a variable output range to provide relatively low levels of fluid output, in response to low demand, and can be operated in combination with one or more constant speed pumps to provide increased levels of output fluid in response to greater demand levels.

Abstract: An apparatus and method for controlling an electrically driven vacuum pump (16) for a motor vehicle provides that below a predetermined level of vacuum (approaching atmospheric pressure) the pump (16) runs at a first speed, and above that level of vacuum the pump (16) runs at a lower speed or is stopped. Pump control is by switching of a single pressure switch (21) between two states, switching from the first state to the second state being accompanied by a time delay to ensure a minimum running period at the first speed.

Abstract: A manual pump includes first, second and third tubular members, and a restraining ring member. The first tubular member has a piston which is mounted movably in the first tubular member. The second tubular member has an upper open end which is fixed sealingly to a lower open end of the first tubular member. The second tubular member further has a first side wall that has first inflow and outflow check valves, and a lower closed end that has second inflow and outflow check valves and a first opening. The third tubular member has a top open end, a bottom constricted end, and a partition. A second opening is formed in a second side wall of the third tubular member. A third opening is formed in the partition. The second side wall has an external thread that is formed near the top open end of the third tubular member. The second tubular member is inserted rotatably into the third tubular member.

Abstract: A directional changeover pump in accordance with the present invention is capable of changing the direction of a fluid flow depending upon the rotational direction of an impeller. The directional changeover pump employs a reciprocable member for opening one discharge port and closing the other discharge port. As a result, the directional changeover pump has an extended service life and a simplified structure, since the wear of the discharge ports is automatically compensated by a spherical configuration of a reciprocating member and the sealing member between the operating components is eliminated.

Abstract: A gas transfer system is provided for establishing or maintaining a predetermined gas pressure within a plenum, such as a tire. In an exemplary embodiment, the gas transfer system includes a power source, a pressure sensor, a control unit, and a gas transfer mechanism. Preferably, a gas transfer mechanism includes a micromechanical device, comprising one or more pumping units that transfer gas from one pressure zone to another. In one embodiment, pumping is accomplished, in part, by heating the gas within a sealable chamber of a pumping unit to cause the pressure of the gas to increase. In another embodiment, the change in pressure of the gas caused by compression of a tire provides a pumping force. Valves are provided for regulating movement of the gas through the gas transfer mechanism and can include electromechanical valves responsive to signals from the control unit, or passively biased valves responsive to applied gas pressure.

Abstract: A water pressure control system in which the pressurizing pump is turned on only in response to low pressure but is turned off only in response to low water flow rates. Water flow is detected with a magnetic switch displaced by water movement. After the pump is turned on, it can not be turned off for ten seconds, to smooth operation. When the system is first activated, the pump is turned on for sixty seconds, without regard to the other control functions, to guarantee priming of the pump.

Abstract: An irrigation/aspiration pump system capable of operating in a plurality of different modes suitable for a variety of different endoscopic surgical procedures. The irrigation/aspiration pump system operates with a selected one of a plurality of tubing sets, each tubing set being adapted to provide irrigation and aspiration for a particular surgical procedure and coded to define the type of procedure for which the tubing set is designed. Each tubing set is adapted to be received by the irrigation/aspiration pump console in a way which enables the code associated with the tubing cassette to be automatically read by a code detecting means associated with the system. The code detecting means supplies appropriate control signals to different parts of the irrigation/aspiration pump system in order to assure that the parameters with which the system will be operating, when the chosen tubing set is being used, are those for which the tubing set is designed.

Abstract: A liquid coolant circulation control system that minimizes the requisite feed pressure and keeps the flow rate of a liquid coolant constant includes a casing accommodating electronic circuits to be immersed in and cooled by a liquid coolant, a feed pump for feeding the liquid coolant to the casing, and a collecting pump for collecting the liquid coolant from the casing. A first measuring meter, interposed between the feed pump and the casing, measures a flow rate and/or a pressure of the liquid coolant flowing into the casing. A second measuring meter, interposed between the casing and the collecting pump, measures a flow rate and/or a pressure of the liquid coolant flowing out of the casing. A determining section calculates a difference or differences between the two flow rates and/or pressures. The determining section sends this information to a control section. The control section controls the output of one or both pumps, so that the difference or differences remain at a predetermined value.

Abstract: The present invention relates to a pumping device comprising two suction inlet holes spaced a predetermined distance apart by an extension tube. In a variant, the pumping device comprises two pump barrels cooperating each with the two inlet holes. In another variant, the pumping device comprises a pump barrel and control means for controlling the flow rates of the effluents coming from the two inlet holes. The pumping device is used in a subhorizontal drain hole.

Abstract: A vacuum system comprises, as an integral assembly, a turbomolecular pump with drive motor, a vent valve, a purge valve, a roughing valve, a heater and an electronic control module. The control module has a programmed processor for controlling the motor and valves and is user programmable for establishing specific control sequences. The integral electronic control module is removable from the assembly and is connected to the other devices through a common connector assembly. Proper introduction of a purge gas through the purge valve is detected by detecting the current load on the pump drive or by detecting foreline pressure. To test the purge gas status, the purge valve may be closed and then opened as drive current or pressure is monitored. After power failure, the controller will continue normal drive of the turbomolecular pump so long as the speed of the pump has remained above a threshold value. Otherwise the vent valve will have been opened, and a start-up sequence must be initiated.

Abstract: A paint circulation system for supplying paint to a plurality of distributors utilizing a circulating pump to circulate paint to the distributors and an injection pump operated by a closely controlled electric motor for injecting paint into the circulation network from a paint supply reservoir to maintain a predetermined pressure within the circulation network. A "leakage" passage having a predetermined restriction permits paint to leave the circulation network when the valved paint distributors are closed, and the use of an automatic timing valve within the leakage bypass permits flow rates within the circulation network to be varied. The components permit paint viscosity and volumes to be determined, settling of the paint particles within the circulation network and degradation of the circulating paint is minimized, and circulating motor wear may be determined.

Abstract: An integral disposable manifold and pump cassette, through which fluid is pumped from inlet tubes, forms a single disposable cassette which may be inserted into a single pump housing. The integral disposable manifold and pump cassette includes first and second sheets of flexible plastic material. Sealed inlet channels are formed between the first and second sheets of flexible plastic material, with the sealed inlet channels being connectable to inlet tubes for fluid passage therethrough. The sealed inlet channels can be individually pinched off to prevent fluid passage therethrough. A sealed main channel, which is connected between the inlet channels and an outlet tube is formed between the first and second sheets of flexible plastic material. The sealed main channel includes a pumping chamber which is also formed between the first and second sheets of flexible plastic material.

Abstract: An infusion pump for regulating fluid flow through the flow path of an IV tubing set for intravenous administration to a patient. The pumping mechanism of the infusion pump comprises a reversible motor having a drive shaft with a wheel mounted thereon. A valve is provided which is adapted for reversibly closing the flow path through the IV tubing set, and a swing arm is provided. The swing arm has a wheel-engaging portion adapted for engaging the wheel, and an actuator portion operatively linked with the valve to actuate the valve. The arrangement is such that, when the motor is turning the drive shaft in a first direction, the swing arm is moved towards a first position where the actuator portion allows the valve to move to its open position to open the flow path. When the motor is reversed to turn the drive shaft in a second direction opposite the first direction, the swing arm is moved to a second position where the actuator portion moves the valve to its closed position to close the flow path.

Abstract: Transfer by pumping of effluents containing at least one gas phase and at least one liquid phase in a transfer line connecting a source of effluents is optimized by interposing on the line, between the source and the point of designation, a multiphase pump. The rotating speed of the pump is regulated so as to adapt the pump flow rate to at least one of the following parameters: flow rate variation well, variation of the volumetric ratio GLR or pressure drop variations occurring in the line during transfer. The values of the parameters are controlled and adjusted to values comparable with the operation of the pump.

Abstract: An evacuation system for unlidded rigid containers including a reciprocating piston pump and a universal disc that provides a leak proof lid for ordinary pots, pans or bowls. The disc is flat and accommodates a variety of container sizes as well as minor surface irregularities in the container lip. Vent holes spaced around the perimeter of the disc prevent implosion of the disc into the container if the disc edge is placed too close to the edge of the container. The disc is somewhat flexible and has a sealing surface on one side for proper seating and sealing on the container lip.

Abstract: To control a solvent composition in a supercritical fluid system, a first pump pumps a first solvent through a first conduit into a mixer and a second pump pumps a second solvent through a second conduit into the mixer. First and second transducers measure the pressure in the first and second conduits and generate first and second signals proportional to the pressures. Each pressure signal is multiplied by a corresponding programmed concentration signal and compared to the programmed pressure in a feedback system to generate an error signal. The error signal is multiplied by concentration signals from a programmer to control the pumping rate of each pump. The pumps pressurize each fluid one at a time at the start of a run. The pressurization process is also used for producing disturbance-free flow as delivery is changed from one pump to another during prolonged runs.

Abstract: A double diaphragm leakproof sealing device for electric windscreen washer pumps has a directing chamber housing two very resilient diaphragms which may be provided with compensating elements for loss of resilience. When there is no leaning liquid pressure, the two diaphragms permanently block, by way of their own resilient action and, as the case may be, by the action of the resilience loss compensating elements, the corresponding discharge ports of the chamber. Depending on the direction of rotation of the pump impeller, the cleaning liquid will cause the resilient deformation of the corresponding diaphragm, allowing the cleaning liquid to flow through the associated discharge passage. When the impeller stops rotating, the diaphragm reestablishes the sealing action on the discharge port.

Abstract: An improved evacuation pump system uniquely designed to evacuate both lidded rigid containers and sealable flexible containers. A vacuum cup fixed to one end of a reciprocating piston pump attaches to the lid of rigid containers for their evacuation and a flexible probe connects to the pump for flexible container evacuation. To achieve this dual function a inlet passage in the pump has a cross bore that slidably and/or rotatably receives a two position valve that selectively connects the pumping chamber with two outlets, one associated with each mode. The flexible probe connects directly to this valve reducing the need for separate passageways.

Abstract: An improved evacuation pump system with dual inlet check valves uniquely designed to evacuate both lidded rigid containers and sealable flexible containers. A vacuum cup fixed to one end of a reciprocating piston pump attaches to the lid of rigid containers for their evacuation and a flexible probe connects to the pump for flexible container evacuation. To achieve this dual function two check valves mounted in the lower end of the pump are provided for the flexible container evacuation mode. One prevents discharge flow into the flexible probe and the other maintains suction in the cup to keep the pump attached to its supporting surface.

Abstract: A double feed pump has two outlet channels to be selectively acted upon with liquid in accordance with the direction of rotation of a feed element and two movable sealing membranes one each being assigned to an outlet channel and separating a valve chamber into a front compartment with valve seat and into a rear compartment, whereby one front compartment each of one valve chamber and one rear compartment of the other valve chamber are connected by a pressure channel. In order to facilitate the manufacture of the parts the sealing membranes are arranged one beside the other in a parting plane of a two-part housing and in each housing half are positioned, assigned to one sealing membrane, an outlet channel and a front compartment with valve seat, and, assigned to the other sealing membrane, a rear compartment and a pressure channel between the front and rear compartments.

Abstract: A control system for longwall face support frames as used in mines, the system comprising pushing rams which are adapted to be actuated at two different pressures (for example, a low pressure of about 70 to 120 bar for non-defined cutting and a high pressure of 120 to 350 bar for defined cutting) with each pushing ram being individually actuatable by a respective non-return valve arrangement, the pushing rams being connected by a common pressure line to an hydraulic pressure unit.

Abstract: An elongated tubular member has an upper closed end and a lower closed end with a first opening. It also has a second opening on its wall and a suction unit movable within the same. A first tubular member has a top open end and a constricted bottom end. The first tubular member has a first inflow and outflow check valve circumferentially spaced from the first inflow check valve. A partition provided adjacent to he constricted bottom end of the first tubular member has a third opening and second inflow and outflow check valves. The elongated tubular member resides rotatably and engageably in the first tubular member.

Abstract: Apparatus for introducing fluids into, and withdrawing fluids from, a hollow organ of the body, in particular a galibladder, for conducting litholysis, comprises a piston-type injection device having a multi-directional valve and which can be removably inserted into an operating mechanism. The injection device has a chamber located in front of its piston and serving as a settling chamber for a mixture of organ secretion and stone sludge removed with the solvent from the hollow organ. The valve is for the sequential connection of the pressure chamber to the hollow organ, to a tank for the solvent, and to a receiving vessel for fluid drawn off.

Abstract: A rotary compressor of variable displacement type comprises a cylinder, a rotor accommodated in the cylinder in an eccentric relationship therewith, at least one vane incorporated in the rotor through an outer periphery of the latter and movable relative to the rotor reciprocatively in a longitudinal direction of the vane, and two side plates closing the cylinder at both axial ends of the latter. A suction port is formed in at least one of the side plates, while an opening portion is formed in a rear side portion of the vane as viewed in a direction of rotation of the rotor and being opened at a surface of the vane making sliding contact with the rotor. This opening portion is repeatedly communicated with and interrupted from a working space in the compressor according to the reciprocative movement of the vane relative to the rotor.

Abstract: Apparatus for evacuating a rigid container using a two-stroke reciprocating-piston pump having an air evacuating vacuum cup which is to be applied to the container lid. The pump cylinder houses a reciprocating piston-check-valve. An adhesive-tape check valve is applied to a container access opening in the lid; and the vacuum cup is seated over the adhesive-tape check valve to evacuate the rigid container. An alternative embodiment employing a vacuum probe having an in-line check valve is inserted into an otherwise plugged opening in the pump cylinder wall to evacuate a deformable container. In the second embodiment, the adhesive-type check valve is eliminated. The two check valves employed in each embodiment alternate open and closed states during piston reciprocation.

Abstract: A door operator having a fluid drive motor and a manual override. The bidirectional hydraulic motor connects to a drive shaft through a power train including a shiftable --quill--type manual clutch mechanism which allows an alternate connection of the drive shaft to a manually-operated wheel. When the cable which shifts the clutch for manual drive is pulled, a switch disables the control for the hydraulic motor. When the motor is not provided with pressured fluid from the pump a hydraulic brake engages the motor.

Abstract: A windshield washer pump including comprising an impeller chamber having a reversible impeller rotatably mounted therein and an inlet for windshield washer fluid communicating therewith. Dual outlets communicate between the impeller chamber and opposite ends of an adjacent outlet chamber. A piston is slidably mounted in the outlet chamber intermediate axially aligned tubular discharge passages extending from the outlet chamber. Oppositely disposed projections are formed on the piston for being alternately urged into engagement with the tubular discharge passages, permitting the alternate pumping of fluid through the tubular discharge passages.

Abstract: The double delivery pump comprises an impeller with double direction of rotation contained in a body connected to an axial intake conduit and defining a cylindrical seat connected to two tangential rectilinear ducts leading into a distribution seat containing a distribution element. The distribution element can slide in the distribution seat and defines shutters which can cutoff one or the other of two delivery conduits connected to the opposite ends of the distribution seat.

Abstract: A fluid pump system whose output can be varied by converting it from maximum output to a lesser output and in between by dumping or varying one of its pumping elements or pistons to the inlet side of the pump. More specifically, a pump is provided with two opposed pistons, both of which are connected to inlet and outlet for maximum capacity. The piston chamber of one piston is equipped with a converter line for leading that chamber back to the inlet, whereby only the remaining piston furnishes the pump discharge. Variations in the adjustable mode of the valve is reflected in the action of the pump relief valve to cause increased effectiveness of a jetter line supplied by the pump output.

Abstract: A windshield washer pump including comprising an impeller chamber having a reversible impeller rotatably mounted therein and an inlet for windshield washer fluid communicating therewith. Dual outlets communicate between the impeller chamber and opposite ends of an adjacent outlet chamber. A piston is slidably mounted in the outlet chamber intermediate axially aligned tubular discharge passages extending from the outlet chamber. Oppositely disposed projections are formed on the piston for being alternately urged into engagement with the tubular discharge passages, permitting the alternate pumping of fluid through the tubular discharge passages.

Abstract: A driver for use in an infusion pumping cassette having an elongated valve actuator which operates a valve controlling the flow of fluid through the cassette, a bracket having a first arm pivotally secured to one end of the valve actuator and a second arm, a cam driveably engaging the second arm, a motor which drives the cam and a positioner which monitors the rotational position of the cam.

Abstract: An impeller driven by a reversible motor is set in a housing and a functional path capable of sending out liquid by pump action is formed between the inner wall of the housing and the impeller. On the both-end side of the functional path are provided two adjacent valve chambers divided by a partition, and within this partition is provided a liuqid introducing path leading to the valve chambers via inlets. On the wall of the valve chamber facing the inlet is opened an outlet, and a valve body which opens and closes the inlets and outlets is set. The liquid introducing path, one valve chamber, the functional path, and the other valve chamber are arranged in series, so that, while one valve chamber is positive in pressure, the other chamber does not fail to be negative in pressure. Thus, liquid is sent out exactly to the outlet on the positive pressure side, without being erroneously set to the other outlet on the negative pressure side.

Abstract: A method of and an apparatus for effecting volume control suitable for use with a compressor for compressing a compressible fluid, such as a refrigerant of the refrigeration cycle, wherein a suction fluid is forcedly closed while a suction step is being performed and the fluid drawn up to then by suction into each working chamber is subjected to adiabatic expansion during the rest of the suction stroke. The fluid in the working chamber subjected to adiabatic expansion is then subjected to adiabatic compression in initial stages of a compression stroke following the suction stroke only for a period corresponding to the period of the adiabatic expansion. An on-off control valve is mounted in a fluid suction passage and operative to be brought, when it is necessary to effect volume control, to a closed position while the suction stroke is being performed, to thereby interrupt the flow of the fluid through the fluid suction passage to the working chamber.

Abstract: A method and apparatus are disclosed which may be used in removing contaminants from underground petroleum storage tanks. A positive displacement pump and piping manifold are used to withdraw contaminants from an underground tank and pump those contaminants into a receiving drum. A startup suction valve is utilized to control the rate at which withdrawal is initiated and a bypass valve controls the rate of withdrawal from the tank as the cleaning operation is performed. A sample connection at the pump discharge provides means for determining the contaminant-to-product ratio of fluid being withdrawn from the underground tank. The bypass valve may be adjusted to maximize the contaminant-to-product ratio and minimize the loss of petroleum product.