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| Number | Title | Issue Date |
| 8172545 | Method for controlling ground meat flow rates A method for continuously controlling the flow rate of a meat input stream for making a meat product is disclosed. A flow rate algorithm is provided that depends upon pump speed (RPM) for control of the flow rate. A correction factor provides further control of the ... | 05/08/2012 |
| 7798781 | Metering pump with self-calibration and health prediction A metering pump incorporates a method of relating inner loop current to a pump output pressure. Pump/motor speed, which correlates to current, is measured and controlled by a system controller. System temperature is also measured by the system controller. The contro... | 09/21/2010 |
| 7607895 | Fluid circulation pump with synchronous motor, equipped with heating means of the fluid, in particular for washing machines A fluid circulation pump (10) with synchronous motor (14), equipped with fluid heating device (40), particularly for washing machines or the like, of the type comprising a rotor (18), equipped with a permanent magnet being rotation-driven... | 10/27/2009 |
| 7421316 | Method and device for regulating fluid pump pressures A method is provided for regulating fluid pump pressures by detecting an elevation differential between a fluid flow control device and the distal end of a fluid line in communication with the fluid flow control device. A fluid flow control device, for instance a pe... | 09/02/2008 |
| 7370776 | Table for supplying liquid for drinking The present invention discloses a table for supplying a liquid for drinking which can accurately measure the amount of discharged liquid for drinking. The invention provides a table for supplying liquid for drinking provided with a table, a liquid discharging server... | 05/13/2008 |
| 7350399 | Leakage detecting device for evaporating fuel processing apparatus A leakage detecting device is connected to an evaporating fuel processing apparatus to detect leakage of evaporating fuel in a ventilation apparatus that includes an electric pump, a fuel tank, and a filter. The electric pump includes a pump portion and a motor port... | 04/01/2008 |
| 7326038 | Pressure switch mechanism and air compressor using the same mechanism An air compressor comprises a tank portion for reserving a compressed air, a compressed air generating portion for generating the compressed air to be supplied to the tank portion, a motor for driving the compressed air generating portion, and a pressure switch mech... | 02/05/2008 |
| 7244106 | Process and device for flow control of an electrical motor fan A method and configuration from maintaining a constant of air to a protective helmet (4) from a fan (3) in a battery powered fresh air unit. The fan (3) is a radial fan with a filter (5) positioned on the suction side of the fan and is op... | 07/17/2007 |
| 7226274 | Cement slab leveling apparatus A concrete slab leveling apparatus is provided that is built upon a vehicle such as a flatbed truck or trailer which makes it highly transportable enabling the invention to move from site to site quickly and easily. The flatbed platform of the vehicle is equipped wi... | 06/05/2007 |
| 7197878 | Pump control system A pump control system (20) for a pump (21) in a gas turbine engine (10) is described. The pump control system (20) comprises demand means (22) for providing a demand signal (23) relating to a required rate of fluid flow and/... | 04/03/2007 |
| 7190275 | Drip rate monitor for intravenous infusion set An apparatus for monitoring the drip rate of an infusion fluid being administered by an intravenous infusion set comprising a housing, drop sensor, alarm and processor. The housing is attachable to a drip chamber, and the drop sensor is positioned in the housing to ... | 03/13/2007 |
| 7163380 | Control of fluid flow in the processing of an object with a fluid An apparatus for and methods of control of a fluid flow. In a system for supercritical processing of an object, the apparatus includes a measuring device for measuring a pump performance parameter and a controller for adjusting a fluid flow in response to the perfor... | 01/16/2007 |
| 7161316 | Method and apparatus for discrete speed compensated torque step motor control Methods and apparatus for controlling a motor are provided. The motor may be operated in a fluid system having a variable static pressure acting on the motor. The method including operating the motor at a first substantially constant torque level, varying the static... | 01/09/2007 |
| 7150711 | Method for controlling an assist pump for fluid delivery systems with pulsatile pressure Method for controlling an assist pump for fluid delivery systems with pulsatile pressure. If for example a heart assist pump is driven with a constant number of revolutions, it is achieved, that the blood is also delivered through the assist pump, even when the hear... | 12/19/2006 |
| 7094019 | System and method of surge limit control for turbo compressors A system and method of surge limit control for turbo compressors including a turbo compressor having an inlet and an outlet, an anti-surge valve, a variable speed drive to operate the compressor, a rotational speed transmitter, an inlet temperature transmitter, an i... | 08/22/2006 |
| 7054738 | Method for estimating engine friction torque Algorithms for real-time estimation of the engine friction torque in a vehicle powertrain are disclosed. Engine friction torque is estimated at start and at engine idle. Recursive and computationally efficient algorithms allow prediction of friction torque for a wid... | 05/30/2006 |
| 6939110 | Control system for I.C. engine driven blower A system for maintaining constant pressure, such as at a mosquito fogging nozzle, by electronically controlling the speed of an engine that is coupled to a blower. A pressure sensor measures the pressure provided by the blower and provides a pressure signal to the e... | 09/06/2005 |
| 6758655 | Process for determining a reference characteristic for controlling a pump In the process according to the invention for determining a nominal values curve of an installation (Hinstallation(Q), Pinstallation(Q)) for controlling the pump capacity of a pump (6) driven by an electric motor (10) with speed c... | 07/06/2004 |
| 6604908 | Methods and systems for pulsed delivery of fluids from a pump A system is disclosed for pumping fluids at desired average flow rates by applying a predetermined force to a pump chamber and pulsing an outlet valve of the pump chamber to deliver a fluid therefrom. In some embodiments, pump chambers are provided within... | 08/12/2003 |
| 6564627 | Determining centrifugal pump suction conditions using non-traditional method A method for determining the suction pressure of a centrifugal pump including the steps of determining pump torque and pump discharge pressure at at least two different speeds, forming a first order wave curve as a straight line using said pump torque and... | 05/20/2003 |
| 6504338 | Constant CFM control algorithm for an air moving system utilizing a centrifugal blower driven by an induction motor A method and apparatus for achieving constant air flow rate economically utilizes an induction blower motor with control settings determining the motor excitation voltage. A memory stores, for a variety of motor speeds, a graph of the speeds plotted again... | 01/07/2003 |
| 6468052 | Vacuum relief device for fluid transfer and circulation systems A safety device for use in a fluid transfer and/or circulation system of the type which uses a pump to draw water from a reservoir through one or more intake lines each extending from an open end at the reservoir to the pump intake. The safety device conn... | 10/22/2002 |
| 6158965 | Fluid flow resistance monitoring system Flow parameters in a fluid delivery assembly are determined by monitoring pressure responses and processing those responses along with information regarding the fluid flow. In one aspect, a processor controls the pump to pump flow quantities in accordance... | 12/12/2000 |
| 6053707 | Control device for slanting plate type variable capacity pump A control device is herein disclosed which comprises a drive piston 12p for changing the position of a slanting plate in a variable capacity pump 11, an electromagnetic proportional valve 13 for driving the drive piston, and a position detector 14 for det... | 04/25/2000 |
| 6017193 | Distribution pressure control apparatus The present invention provides a distribution pressure controlling apparatus comprising section for supplying water in a distribution reservoir to a distributing pipe network, section for detecting an outlet pressure of water, section for detecting an out... | 01/25/2000 |
| 5899665 | Method and apparatus for controlling infusion volume A flow sensor detects drops of infusion fluid that enter the drip chamber of an infusion system and generates a drop-detection signal indicating each drop detected. A setting controller receives the drop-detection signals from the flow sensor and counts t... | 05/04/1999 |
| 5796184 | Method and an apparatus for stopping a motor-driven pressure generating pump of a system for coating workpieces with atomized liquid coating material A method and an apparatus are provided for stopping a motor-driven pressure generating pump of a system for coating workpieces with atomized liquid coating material in case of an empty material reservoir or a leakage in a material supply from a material r... | 08/18/1998 |
| 5755559 | Apparatus and method for pumping supercritical fluid and measuring flow thereof In a piston pump for pumping liquid carbon dioxide at a temperature below 30 degrees Fahrenheit and pressures at least as high as 7500 psi, the volume leaving the pump is determined by measuring only pressure or other parameter related to flow and movemen... | 05/26/1998 |
| 5743715 | Method and apparatus for load balancing among multiple compressors Balancing the load between compressors is not trivial. An approach is disclosed to balance loads for compression systems which have the characteristic that the surge parameters, S, change in the same direction with rotational speed during the balancing pr... | 04/28/1998 |
| 5738495 | Device for contolling the water pressure and flow in a water supply unit A device for constant, automatic regulation of water pressure and flow in a water supply plant, comprising an electric pump fitted in the main water pipe, an adjustable pressure switch connected to the main water pipe, and an electronic control unit, whic... | 04/14/1998 |
| 5736823 | Constant air flow control apparatus and method Air handling apparatus (10) delivers a volume of air at a generally constant flow rate regardless of changes in the operating conditions of a system with which the apparatus is used. A blower (12) pushes air from one point to another. The blower is operat... | 04/07/1998 |
| 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 |
| 5711483 | Liquid spraying system controller including governor for reduced overshoot A spray controller includes a governor which limits the current applied to an electric motor that operates a spray system pump. The controller accepts pressure sensing and pressure setting signals and provides a pulse train output to drive the motor whene... | 01/27/1998 |
| 5709533 | Process and a device for regulating the flow rate of an air current The invention is based on the premise that, for a given air blower, the current I consumed by the electric motor, the rotational speed N and the air flow rate Q are interconnected, regardless of the dynamic pressure, by a law Q=f(I, N) which can be experi... | 01/20/1998 |
| 5707211 | Variable speed pump system with a hydropneumatic buffer/pressure tank A fluid pressure control system which is usable to control pressure in a fluid distribution system includes a variable speed drive coupled to a pump. A hydropneumatic tank is coupled to the distribution system. In normal operation, the variable speed driv... | 01/13/1998 |
| 5653876 | High pressure pump for fine liquid metering In order to reduce the overall size of serial pump arrangements, several block-disk-like building elements are used. These building elements are made of a non-metallic material and lie against each other with their control surfaces in a sandwich like stac... | 08/05/1997 |
| 5651663 | Safety device for a pump for installation in lines for liquids, especially water, and a device for delivering liquid In order to create a safety device (1) by means of which reliable protection of the pump can be achieved as simply as possible, it is proposed that safety device (1) have a housing (4) provided with an inlet (5) and an outlet, inside which housing a first... | 07/29/1997 |
| 5586574 | Air system control Control system for maintaining selected pressure in a gas distribution system including a header and multiple takeoffs from the header including a compressor to supply gas to the header at selected pressure range, a control valve in the header upstream of... | 12/24/1996 |
| 5559407 | Airflow control for variable speed blowers Apparatus and method for controlling an air distribution system of the type which includes a motor drivingly associated with a blower and a duct system, and further including a target air flow rate signal which represents a target air flow for the air dis... | 09/24/1996 |
| 5540554 | Method and apparatus for controlling hydraulic systems of construction equipment A controller regulates a hydraulic pump for hydraulic equipment to allow long-term use of environmentally safe hydraulic fluids. This is accomplished by limiting the hydraulic pump power output to a level established to prevent the operating temperature f... | 07/30/1996 |
