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| Number | Title | Issue Date |
| 7758315 | Pump controller for controlling pumps connected in tandem A system for automatically controlling a pumping unit used in fire suppression comprises a pumping unit, a water flow sensor and a pump controller. The pumping unit has a pump with a suction inlet configured to receive water from an upstream pumping unit and an engi... | 07/20/2010 |
| 7290990 | Short reverse rotation of compressor at startup In a method of operating a scroll or screw compressor at startup, the compressor is rotated in reverse for a brief period of time. The compressor is of a type that does not compress liquid when rotated in reverse. The purpose is to boil off the liquid refrigerant fr... | 11/06/2007 |
| 7185528 | Speed and fluid flow controller A system and method for measuring fluid flow rate in a system where fluid is pumped, such as a gas monitoring instrument where gas is pumped from a space such as a room or enclosure through a conduit to a sensor. The flow of gas through a pump is determined by measu... | 03/06/2007 |
| 7168925 | Automatic optimizing pump and sensor system A reciprocating electromagnetic pump comprising a coil wound about a bipolar or tripolar core, a diaphragm structure mechanically coupled to at least one arm with a magnet attached to one end of the arm and a controller electronically connected to the coil. The cont... | 01/30/2007 |
| 7048511 | Device for prevention of backward operation of scroll compressors A method and apparatus which provides a pressure sensor and/or temperature sensor connected to the low pressure side of a refrigeration system, or the discharge line of a scroll compressor. When the scroll compressor rotates backward, the change of pressure or tempe... | 05/23/2006 |
| 7006896 | Sealant dispensing correction method As the command signal to a unit for dispensing sealant is modified, the pressure range for the calibrated point is either extrapolated or interpolated as necessary in order to achieve the correct flow rate. As a result, each time the unit dispenses, it is also recal... | 02/28/2006 |
| 6902378 | Electronically controlled vacuum pump A vacuum system comprises, as an integral assembly, a vacuum pump with drive motor, a purge valve, a roughing valve and an electronic control module. A cryogenic vacuum pump and a turbomolecular vacuum pump are disclosed. The control module has a programmed processo... | 06/07/2005 |
| 6893227 | Device for prevention of backward operation of scroll compressors A method and apparatus which provides a pressure sensor and/or temperature sensor connected to the low pressure side of a refrigeration system, or the discharge line of a scroll compressor. When the scroll compressor rotates backward, the change of pressure or tempe... | 05/17/2005 |
| 6487903 | Method and system for determining pump cavitation and estimating degradation in mechanical seals therefrom A method and system for determining pump cavitation is disclosed. In accordance with the principle of the invention, changes in dynamic fluid pressure within a pump are monitored and compared to a determined cavitation alarm pressure. The determined cavit... | 12/03/2002 |
| 6461113 | Electronically controlled vacuum pump A vacuum system comprises, as an integral assembly, a vacuum pump with drive motor, a purge valve, a roughing valve and an electronic control module. A cryogenic vacuum pump and a turbomolecular vacuum pump are disclosed. The control module has a programm... | 10/08/2002 |
| 6186744 | Volumetric airflow indicator and control device A device for measuring and automatically controlling the volumetric rate of air through an air handling system used in connection with clean rooms. A desired volumetric air rate is maintained by measuring air pressure differentials between different locat... | 02/13/2001 |
| 6050918 | Controller and control method of electric pump feedback controlled as a function of drain flow rate for a continuously variable transmission When the pressure of a discharge fluid of an electric pump (1) exceeds a predetermined relief pressure, relief valve (6) discharges a part of the fluid to a drain passage (5). A sensor (8, 10, 11) detects a drain flowrate of the drain passage (5), and fee... | 04/18/2000 |
| 6022195 | Electronically controlled vacuum pump with control module A vacuum system comprises, as an integral assembly, a vacuum pump with drive motor, a purge valve, a roughing valve and an electronic control module. A cryogenic vacuum pump and a turbomolecular vacuum pump are disclosed. The control module has a programm... | 02/08/2000 |
| 5947692 | Peristaltic pump controller with scale factor that varies as a step function of pump inlet pressure A controller for a peristaltic pump receives as an input pressure Pi sensed at the inlet of the pump. The controller derives a nonlinear scale factor SPi that varies as a step function with Pi. The scale factor SPi | 09/07/1999 |
| 5819524 | Gaseous fuel compression and control system and method A gaseous fuel compression and control system is disclosed which utilizes a helical flow compressor/turbine integrated with a permanent magnet motor/generator and driven by a torque controlling inverter to compress or expand gaseous fuels, precisely contr... | 10/13/1998 |
| 5795328 | Vacuum system and a method of operating a vacuum system 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 means. The pump is connected to the vacuum line for drawing fluids therefro... | 08/18/1998 |
| 5791880 | Infusion pump having power-saving modes An infusion apparatus includes a pump powered by a source of battery power and capable of operating in a plurality of infusion modes and operating in a power savings mode. The infusion apparatus further includes sensors which sense various conditions of t... | 08/11/1998 |
| 5772403 | Programmable pump monitoring and shutdown system A control system 10 for monitoring operation of a high pressure plunger pump 12 includes a microprocessor-based controller 40 and a plurality of sensors. Inlet pressure transducers 48 output electrical signals to the controller at intervals of less than 1... | 06/30/1998 |
| 5762475 | Automatic solenoid control valve calibration A calibration apparatus and method for calibrating a hydraulic control valve connected to an electronic controller. The electronic controller selects control signals and reads corresponding hydraulic pressure outputs of the hydraulic control valve and sel... | 06/09/1998 |
| 5725357 | Magnetically suspended type pump In a magnetically suspended type pump, an operating state of the pump can be obtained without using a pressure gauge and a flowmeter. In addition, in the case where the magnetically suspended type pump is applied to a blood pump, in order to reduce the nu... | 03/10/1998 |
| 5718565 | Apparatus and process for operating a dry-compression vacuum pump A process for operating a dry-compression vacuum pump with at least one pump chamber and at least one rotor driven by an electric motor, and to a vacuum pump suitable for this operating process. To reduce operational shutdowns for maintenance purposes wit... | 02/17/1998 |
| 5690476 | Safety device for avoiding entrapment at a water reservoir drain A safety device for avoiding entrapment at a water reservoir drain by using a vacuum operated switch to interrupt power to the reservoir pump whenever a blockage occurs. In addition, a manual reset switch requires human intervention to re-activate the res... | 11/25/1997 |
| 5624394 | Vacuum system and a method of operating a vacuum system 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 therefr... | 04/29/1997 |
| 5520517 | Motor control system for a constant flow vacuum pump The invention is a constant flow pump control system that compensates for a change in gas flow rate that is caused by a change in the load resistance, by making the speed change inversely with the change in load resistance, desirably by sensing the change... | 05/28/1996 |
| 4955795 | Scroll apparatus control A scroll-type machine having a control arrangement which acts to disable the machine when there is an abnormal pressure in one of the scroll fluid pockets, thereby preventing damage to the machine upon reverse rotation or low system charge.... | 09/11/1990 |
| 4730999 | Negative pressure supply apparatus for automobiles The vacuum tank is connected to an engine intake manifold, and a vacuum pump generates compulsarily a negative pressure so as to maintain the negative pressure at a predetermined setting pressure value. The vacuum pump has a diaphragm pump for discharging... | 03/15/1988 |
| 4687021 | Vacuum valve-sensor device A vacuum valve-sensor device mounted on a vacuum source and maintaining the vacuum generated by the vacuum source to a required level. It includes a one-way valve which allows gas to flow towards the vacuum source but not away therefrom, and a pressure se... | 08/18/1987 |
| 4596514 | Pressure responsive pump drive motor control apparatus having spot switch and alarm lamp A pressure control apparatus, which can be used for a braking force magnification apparatus for a vehicle or a door closing and opening apparatus includes a sensor for sensing a pressure within a vacuum booster. The sensor is of a transfer-contact-type in... | 06/24/1986 |
| 4525125 | Pressure responsive pump control system having an alarm lamp A pump control system has a vacuum pump driven by a DC motor to supply a negative pressure to a container first power and driving transistors which are interconnected to energize the DC motor, second power and driving transistors which are interconnected ... | 06/25/1985 |
| 4524311 | Control for pumping devices used in vehicles Disclosed is a control for a pumping device in vehicle application in which, upon throwing a power switch (6) and closing a brake actuator switch (8), a second driver transistor (76) is rendered conductive and a first driver transistor (75) non-conductive... | 06/18/1985 |
| 4518316 | Pressure sustaining apparatus A pressure sustaining apparatus which can be used for a braking force magnification apparatus for a vehicle includes a control circuit which energizes a DC motor and a vacuum pump or a compressor associated with the DC motor. When the absolute value of th... | 05/21/1985 |
| 4507054 | Liquid dispensing system A liquid dispensing system comprising a collapsible container, a dispensing head, a conduit leading from the container to the dispensing head and a pump for pumping liquid from the container through the conduit to the dispensing head. A vacuum switch is r... | 03/26/1985 |
| 4468170 | Low level indicator A low level indicator and warning device is provided wherein a diaphragm is provided directly in a line for drawing liquid from one container to another. Liquid flowing in the line washes directly across the diaphragm so that it remains clean and thus ope... | 08/28/1984 |
| 3992130 | Sump pump system and pressure responsive switch assembly therefor A sump pump system includes a remote pressure responsive switch assembly designed for a wall plug and having a plug in connection for the pump motor cord, the pressure responsive switch assembly also having an air pressure connection to the sump pump for ... | 11/16/1976 |
