Class 417/4 - Having means sensing condition in common inflow or outflow line

Subclass of Class 417 - Pumps
Definition: Subject matter in which sensing means is operative to sense
No. of patents: 29
Last issue date: 12/21/2010

Number	Title	Issue Date
7854596	System and method of operation of multiple screw compressors with continuously variable speed to provide noise cancellation A system for cancelling or attenuating noise in at least two positive displacement compressors proximately located from each other for use with a heating or cooling system. A lead compressor and a lag compressor have a controllable rotational speed and phase of oper...	12/21/2010
7641448	Cleaning an ink chamber of a printing unit There is described a method and a system for cleaning an ink chamber (1) of a printing unit. The system includes a storage tank (10) which via a high-pressure pump (9) is connected with a hydrophore (2). In the hydrophore a high pressure ...	01/05/2010
7387498	System and method for noise attenuation of screw compressors A system is provided for attenuating noise in at least two positive displacement compressors proximately located from each other for use with at least one heating or cooling system. A lead compressor and a lag compressor have a selectably controllable rotational spe...	06/17/2008
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
7255539	Pump pressure limiting engine speed control A sprinkler system for building includes an internal combustion engine which operates a water pump. The water pump in turn forces water through pipes to sprinkler heads. The engine is at least in part controlled by a throttle control mechanism which includes a sprin...	08/14/2007
7252483	Method of managing time, at which maintenance in a gas compressor multiple system should be carried out The method of managing time M, at which maintenance of a gas compressor multiple system incorporating therein a plurality of gas compressors should be carried out, involves making a comparison between a value of M and a predetermined time N for necessary maintenance...	08/07/2007
7093050	Control arrangement The network arrangement includes at least one common bus. An input member is connected to the common bus. An output member is connected to the common bus. The input member comprises at least one input contact defined with a unique identity. The output member compris...	08/15/2006
7077160	Water pressure pump An apparatus for boosting residential water pressure. To attain this, a conduit receives water supplied to a residence and routes the water through and inlet on/off valve and a first check valve to a pump, where said pump provides water to the residence as well as t...	07/18/2006
7028491	Method and apparatus for reducing inrush current in a multi-stage compressor A compressor assembly having a first compression mechanism operatively coupled to a first motor and a second compression mechanism operatively coupled to a second motor. The first compression mechanism compresses the vapor from a low pressure to an intermediate pres...	04/18/2006
6599094	Screw compressor system and operating method thereof A screw compressor system comprises a plurality of screw compressors the capacity of each of which is controlled by repeating load operation and no-load operation. Using a timer output corresponding to compressed gas consumption in a demander including ga...	07/29/2003
6547529	Dry tank shutdown system for pumps A sensor, system, and method for determining whether sufficient water is present to safely operate a pump. The sensor includes first and second conductive fittings that are physically and electrically isolated from one another by a third non-conductive fi...	04/15/2003
6419454	Air compressor control sequencer A controller for managing a plurality of compressors in an efficient manner such that the system uses less energy, has lower maintenance cost and experiences less wear. For a system with multiple compressors the controller has the minimum number of compre...	07/16/2002
6344722	Control device for a membrane pump A control device for a diaphragm pump to feed a filter press or similar user unit comprising a three-phase electric driving motor for the pump which is connected to a supply main via a variable-frequency converter, which frequency converter has an analogu...	02/05/2002
6257833	Redundant, dedicated variable speed drive system A redundant, modular pump system includes a plurality of substantially identical pump modules. Each module includes constant speed drive circuitry, variable speed drive circuitry and a pump. Expansion is accomplished by adding modules. Reliability is enha...	07/10/2001
6233954	Method for controlling the operation of a compression system having a plurality of compressors A fluid compression system includes a plurality of compressors, each compressor having a local controller for controlling operation thereof and a sensor for sensing the pressure of compressed fluid discharged therefrom. A method for controlling operation ...	05/22/2001
6164920	Perfusion system with control network A medical perfusion system for use in connection with the medical treatment of a patient is provided with a first type of perfusion device in the form of a blood pump adapted to pump blood through a fluid conduit connected to the patient and a second type...	12/26/2000
5974345	Dairy chemical dispensing system A dairy chemical dispensing system for supplying an amount of at least one chemical to a utilization point in a dairy wash system, comprising: (a) an operator input controller for receiving operator input comprising input of a given amount of chemical to ...	10/26/1999
5925220	Suction roll of a paper machine having a noise damping chamber A suction roll for a paper machine or the like including a perforated annular roll shell which is rotatable. A stationary suction box inside the roll shell with respect to which the shell rotates. The suction box is defined between two circumferentially s...	07/20/1999
5789879	Multiple pump hydraulic power system A multiple electric motor hydraulic oil pump power system including a programmable controller having electric motor starting and stopping circuitry for hydraulic oil flow control. The circuitry having means to compare each electric motor running hours and...	08/04/1998
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
5522707	Variable frequency drive system for fluid delivery system 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 var...	06/04/1996
5487646	Vacuum pump control apparatus for an evacuating type waste water collecting system A vacuum pump control apparatus for an evacuating-type waste water collecting system is disclosed. In the system, waste water discharged from houses and facilities is collected into a water collecting tank by vacuum sewer pipes provided with a negative pr...	01/30/1996
5360320	Multiple solvent delivery system 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 measur...	11/01/1994
5253981	Multichannel pump apparatus with microflow rate capability A multichannel pump system for HPLC and other uses has a plurality of fluid pumps whose input is fed separately to at least one high pressure mixing unit downstream of the pumps and any associated items such as pulse dampeners and pressure transducers. A ...	10/19/1993
5106269	Method and device for pumping a petroleum fluid A method and device for pumping a petroleum fluid passing through a pipe and having a quantity of gas and a quantity of liquid. The quantities of gas and liquid are measured to determine the weight of the fluid in a section of the pipe and, depending upon...	04/21/1992
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 inlet. The supervisory computer manipulates the set point s...	02/21/1989
4304103	Heat pump operated by wind or other power means A heating and/or cooling system comprising a windmill for driving a first refrigerant compressor in parallel with a second refrigerant compressor driven by an electric motor or other power means. The second compressor operates the system when the wind vel...	12/08/1981
4232997	Method and apparatus for controlling compressors A method and apparatus for controlling a compressor is disclosed wherein both the compressed air output and the speed of the compressor are simultaneously adjusted in relation to compressed air demand over a wide range of air demands and in a way so as to...	11/11/1980
4083657	Flood guard warning system, apparatus and process A plurality of horizontally and vertically spaced apart remote liquid level sensor assemblies free of upwardly directed surfaces operatively connect only under emergency conditions to the sump tank of a sewerage system through vertical housings connected ...	04/11/1978

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Class 417/4 - Having means sensing condition in common inflow or outflow line