|
Match
|
Document |
Document Title |
|
|
7967572 |
Hydrogen operated power system
One form of a hydrogen operated power system according to this invention is a fuel cell system (20) provided with a supply system which supplies a gaseous fuel from a fuel supply tank (24) to a...
|
|
|
7897327 |
Method and apparatus for pressure control for maintaining viability of organs
A method for controlling a pump for delivery of liquid to an organ over a series of fixed-length time intervals f, each interval f comprising a time t1 and a time t2 wherein t1+t2 equals the length...
|
|
|
7785405 |
Systems and methods for gas separation using high-speed permanent magnet motors with centrifugal compressors
Systems and processes are provided for gas separation using high-speed permanent magnet variable-speed motors to accelerate and decelerate centrifugal compressors suitable for use in pressure swing...
|
|
|
7628590 |
Method and apparatus for reducing free flow risk
A technique for reducing the risk of free flow through a pump is disclosed. The technique includes sensing a pressure difference between the pump inlet and outlet. The pressure difference is...
|
|
|
7276870 |
Arrangement for overload protection and method for reducing the current consumption in the event of mains voltage fluctuations
The arrangement as overload protection for the mains voltage (U) comprises an electric motor (1), a compression unit having a compressor (2), a mains voltage-monitoring unit (3), a device for...
|
|
|
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...
|
|
|
6966759 |
Compressor diagnostic and recording system
A compressor diagnostic system incorporates a control which receives a plurality of data streams about various operational features of the compressor. As an example, both temperature and pressure...
|
|
|
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...
|
|
|
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...
|
|
|
6264431 |
Variable-speed motor drive controller for a pump-motor assembly
A liquid pump system for providing liquid to a tank includes a variable-speed motor drive and a control circuit coupling the variable-speed motor drive to a power source. The control circuit has a...
|
|
|
6238188 |
Compressor control at voltage and frequency extremes of power supply
A method is presented to prevent compressor damage by reducing compressor load when operating speed either is too low or too high as can be the case at extremes of line frequency and voltage. The...
|
|
|
6210119 |
Reverse rotation detection compressors with a preferential direction of rotation
A method is disclosed for identifying when a compressor is being run in reverse due to improper wiring. In a preferred embodiment, sensors sense the condition of a refrigerant at the inlet line and...
|
|
|
6193470 |
Method of operating a radial compressor set with intake and discharge flow control
A method of operating a radial compressor wherein the output pressure and the throughput m through a radial compressor are measured and the working point A in the operational characteristic diagram...
|
|
|
6056510 |
Multistage vacuum pump unit
A multistage vacuum pump unit having a plurality of separate single-stage pumps connected in series with each other by exhaust pipes, the exhaust pipes each connecting a suction port of one of the...
|
|
|
5947689 |
Automated, quantitative, system for filtration of liquids having a pump controller
A system is provided for proceeding with automated filtration of liquids in a manner which allows for quantitative collection of desired filtrates or permeates. The system, as well as its...
|
|
|
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...
|
|
|
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...
|
|
|
5553997 |
Control method and apparatus for a centrifugal chiller using a variable speed impeller motor drive
A method of controlling the operation of a centrifugal compressor in a water chiller system. The compressor's capacity is variable by modulating its speed of rotation or by modulating its inlet...
|
|
|
5538396 |
Water pumping system
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...
|
|
|
5393202 |
Process and device for optimizing the transfer by pumping of multiphase effluents
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...
|
|
|
5392539 |
Hydraulic drive system for construction machine
In a hydraulic drive system for a construction machine, first flow control mechanism includes first and second flow control valves (11a, 11b) and first interlock mechanism (54, 55) for interlocking...
|
|
|
5355691 |
Control method and apparatus for a centrifugal chiller using a variable speed impeller motor drive
A controller for controlling the capacity of a centrifugal chiller compressor. The compressor is driven by an electric motor and has variable inlet guide vanes that control the flow of refrigerant...
|
|
|
5336051 |
Inline non-invasive pressure monitoring system for pumps
The invention is a pressure sensitive valve that in different forms can be used to provide: an adjustable resistance to flow, adjustable positive or negative pressure relief, negative pressure...
|
|
|
5197859 |
Well pump system
A well pump system having a motor-driven pump and a pressure tank for delivering water from a source to a utilization point. A sensing device detects a parameter correlated to the rate of flow into...
|
|
|
5190442 |
Electronic pumpcontrol system
A sewage pumping system includes a container, an inlet for the inflow of liquid and a modality for ascertaining the liquid level in the container. Two or more pumps are provided, each having an...
|
|
|
5054995 |
Apparatus for controlling a fluid compression system
An apparatus includes a compressor for compressing fluid including a sensor capable of sensing at least one function relative to the operation of the compressor. A controller controls the...
|
|
|
5024294 |
Differential pressure transducer
A differential pressure sensor indicating a housing forming a high pressure chamber, a nozzle mounted on the housing at one end of the chamber, a diaphragm mounted in the chamber to form a low...
|
|
|
4945491 |
Monitor and control for a multi-pump system
Wire-to-water efficiency (W) of a multi-pump system is monitored and accurately determined according to the formula: ##EQU1## wherein Q is flow through the system, HS is total dynamic head across...
|
|
|
4913625 |
Automatic pump protection system
An automatic pump protection system is comprised of a plurality of sensors for measuring process parameters indicative of a loss of pump suction or of pump motor failure. Analysis of the parameters...
|
|
|
4856965 |
Control system of pumping operation using AC exciting generator-motor
A control system of pumping operation comprises a cycloconverter for converting AC power from a AC power system into AC power having a given frequency, anAC exciting generator-motor, having a...
|
|
|
4807150 |
Constraint control for a compressor system
A supervisory computer for a centrifugal compressor control system is disclosed which manipulates the set point of a controller for a valve in a recycle line from the compressor systems outlet to...
|
|
|
4799864 |
Hydro-pneumatic pumpsets
A packaged hydro-pneumatic pumpset system in which a plurality of pumps JI, M2, M3 are brought into operation sequentially as water pressure in the system drops below pre-set values. The system...
|
|
|
4562531 |
Integrated control of output and surge for a dynamic compressor control system
An integrated control system for both the output and surge protection of a centrifugal compressor in a chilled, water system is provided by biasing the output of a feed forward and cascade...
|
|
|
4560322 |
Regulator for regulating the output pressure of a motor driven pump
Regulator in a motor driven pump for the regulation of the output pressure according to a predetermined value. An automatically functioning reliable regulation according to a predetermined value in...
|
|
|
4551069 |
Integral oil pressure sensor
An improved oil pump assembly for a refrigeration compressor is disclosed which includes a sensor located within the oil pump housing which is operative to de-energize the compressor in the event...
|
|
|
4451893 |
Control method and control system for hydrostatic drive system
A control method and a control system for a hydrostatic drive system including a variable displacement hydraulic pump and a hydraulic actuator connected together to form a closed hydraulic fluid...
|
|
|
4443156 |
Automatic natural gas compressor control system
A control system for a compressor utilized in transferring natural gas from relatively low pressure wells to a relatively high pressure pipe line incorporating automatic shutdown of the compressor...
|
|
|
4330238 |
Automatic actuator for variable speed pump
An automatic speed-control actuator for variable speed pumps. A rotary or near actuator changes the pump speed to prevent unacceptably low pressures on the pump inlet or unacceptably high pressures...
|
|
|
4220013 |
Pressure compensated control for air conditioning system or heat pump
A pressure compensated safety control is employed to shut off the compressor at high compression ratios, caused, for example, by reduced air flow over the condenser or other reasons. This is...
|
|
|
4218191 |
Multi-constraint control of a compression system
A compression system is controlled so as to maintain the actual suction pressure as close as possible to a desired suction pressure without exceeding the operational limitations of the compression...
|
|
|
4124331 |
Automatic control systems for a well pump installation
For a well pump installation, automatic control of the starting and stopping of the pump motor relies upon a simultaneous detection of the suction and delivery heads so that a single switch may...
|
|
|
4108574 |
Apparatus and method for the indirect measurement and control of the flow rate of a liquid in a piping system
Apparatus and process for automatically measuring and controlling the instantaneous flow rate of a liquid in a piping system by varying the speed of a centrifugal pump in response to a flow rate...
|
|
|
4102604 |
Method and apparatus for noninteracting control of a dynamic compressor having rotating vanes
A control system is disclosed for a noninteracting control and protection of a dynamic compressor having rotating vanes.The method consists of a junction of a few control circuits for controlling...
|
|
|
3994294 |
Syringe pump valving and motor direction control system
Apparatus for fluid flow control in a parenteral administration system, utilizing a syringe pump operated by a motor to repetitively fill and empty a syringe cartridge over a plurality of...
|
|
|
3994623 |
Method and apparatus for controlling a dynamic compressor
A method is disclosed for a cascade control of a dynamic compressor to maintain a constant mass flow rate to a process. The method consists of a successive junction of control loops for controlling...
|
|
|
3772805 |
METHOD AND SUCTION DREDGING INSTALLATION FOR CONVEYING DREDGING SPOIL
The pressure difference across the pump of a suction dredging installation and/or the rate of change of this pressure difference are determined. The suction pipe is connected to the pump for...
|
|
|
3643639 |
PRESSURE DIFFERENTIAL SPEED SENSOR
A pressure differential sensing device has a housing divided into two chambers on opposite sides of a diaphragm contained therein; a first of the two chambers has conduit means adapted for...
|
|
|
3628263 |
IMPROVEMENTS IN PRESSURE DIFFERENTIAL MEASURING MEANS FOR SUCTION DREDGING INSTRUMENTS
A pressure differential measuring device is located on board a dredging vessel. The water-filled lines transmitting to the measuring device communicate with branches of a purgative water system at...
|
|
|
3617151 |
FLUID FLOW CONTROLLING VALVE AND SYSTEM
A fluid-actuated throttling valve and system for controlling fluid flow through a conduit by operation of the valve. The valve is characterized by having a housing with an inlet and outlet arranged...
|
|
|
3584977 |
PROCESS FOR METERING LIQUID THROUGH SERIALLY CONNECTED PUMPS
A process for metering liquid from a source into a material flowing through a vessel by means of two variable speed gear pumps serially connected between the source and the vessel wherein changes...
|