| Patents for F04B 49 - Control of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for in, or of interest apart from, groups (22,036) |
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| 05/29/1991 | DE3939146A1 High pressure pipe cleaner - avoids pressure fluctuations on pump drive by blocking off outlet valve of pump valve |
| 05/29/1991 | CN1051796A Method and apparatus for controlling a fluid compression system |
| 05/28/1991 | US5018948 Rotary displacement compressor with adjustable outlet port edge |
| 05/28/1991 | US5018947 Screw type vacuum pump |
| 05/28/1991 | US5018366 Control circuit unit for a variable capacity compressor incorporating a solenoid-operated capacity control valve |
| 05/28/1991 | CA1284478C Refrigeration system including capacity modulation |
| 05/22/1991 | EP0428374A1 Positive displacement pump systems |
| 05/22/1991 | EP0259464B1 Method and system for infiltration detection using pressure measurment |
| 05/21/1991 | US5017101 Selectively operated gerotor device |
| 05/21/1991 | US5017099 Fluid regulator valve |
| 05/21/1991 | US5017098 Power transmission |
| 05/21/1991 | US5017094 Solenoid valve control system for hydrostatic transmission |
| 05/21/1991 | US5016440 Apparatus for delivering a controllable variable flow of pressurized fluid |
| 05/21/1991 | CA1284366C Chromotographic pumping system |
| 05/16/1991 | DE3937827A1 Multistage compressor with high pressure reservoir - with operation provided by selective connection of inlet to high compression stage(s) |
| 05/15/1991 | EP0427282A1 Car air conditioner |
| 05/15/1991 | EP0427046A1 Vehicle suspension system |
| 05/15/1991 | CN2077043U Miniature air compressor |
| 05/14/1991 | US5015153 Compressor cutoff control responsive to shaft position |
| 05/14/1991 | US5015152 Battery monitoring and charging circuit for sump pumps |
| 05/14/1991 | US5015151 Motor controller for electrical submersible pumps |
| 05/08/1991 | EP0426152A1 Compressor and method of detecting quantity of mixture of coolant and lubricant in the compressor |
| 05/08/1991 | CN1051231A Pumping plant |
| 05/07/1991 | WO1991006762A1 Method and apparatus for controlling a fluid compression system |
| 05/07/1991 | US5013220 Oil pump having regulator valve isolated from dynamic pressure of pumped oil |
| 05/07/1991 | US5013217 Compressing apparatus with extended variable capacity range and capacity control method thereof |
| 05/07/1991 | US5012724 Radial piston hydraulic motor of variable cylinder capacity |
| 05/02/1991 | WO1991005686A1 Process for operating an auxiliary pump |
| 05/01/1991 | CN1012514B Automatic water supplying device and method for controlling same |
| 05/01/1991 | CN1012513B Driving and controlling device for hydraulic building machine |
| 04/24/1991 | EP0424087A1 Micro-pump or micro-discharge device |
| 04/24/1991 | EP0423257A1 Device for a variable displacement hydrostatic pump. |
| 04/23/1991 | US5009576 Compressor unloader controller |
| 04/21/1991 | WO1991006062A1 Computer controlled metering pump |
| 04/21/1991 | CA2027222A1 Calibrated fluid injection system |
| 04/18/1991 | WO1991005166A1 Vacuum pumping group |
| 04/18/1991 | WO1991005163A1 Improved fluid-working machine |
| 04/17/1991 | CN1050756A Power transmission |
| 04/16/1991 | US5007805 Reversible variable displacement hydraulic device |
| 04/10/1991 | CN1050583A Anti-flooding sewage grinder pump liqucd level control system in separately mounted canister |
| 04/09/1991 | US5006050 High accuracy disposable cassette infusion pump |
| 04/09/1991 | CA1282753C Variable volume ratio screw compressor with step control |
| 04/09/1991 | CA1282737C2 Flow control system using boyle's law |
| 04/04/1991 | WO1991004415A1 Capacity control circuit for variable capacity pump |
| 04/03/1991 | EP0419984A2 Electrohydraulic control of a hydraulic machine |
| 04/02/1991 | US5004403 Pressure responsive drivers for reciprocating pump and method |
| 04/02/1991 | US5004265 Suspension system |
| 04/02/1991 | CA1282386C Scroll type compressor with displacement adjusting mechanism |
| 03/28/1991 | DE4029510A1 Axial piston pump for driving dynamo - has regulating piston for rapid response to loading variations |
| 03/28/1991 | DE4029509A1 Variable output axial piston pump - has input connected by load regulating valve block to swashplate chamber and interiors of hollow pistons |
| 03/28/1991 | DE3931178A1 Controlling pump delivery head - measuring speed and pulse-interval ratio, and allocating delivery head actual value to each value pair |
| 03/28/1991 | DE3930814A1 Piston-type vehicle air compressor - has changeover valve on cylinder head, controlling air supply to pressure and compression chambers |
| 03/26/1991 | WO1991004099A1 Anti-flooding sewage grinder pump liquid level control system in separately mounted canister |
| 03/26/1991 | US5003239 Peristaltic pump monitoring device |
| 03/26/1991 | CA2042050A1 Anti-flooding sewage grinder pump liquid level control system in separately mounted canister |
| 03/20/1991 | CN1012098B Improved pump pressure sensor |
| 03/19/1991 | US5000664 Apparatus and method to test for valve leakage in a pump assembly |
| 03/19/1991 | US5000525 For automotive vehicles |
| 03/12/1991 | US4999020 Variable displacement high pressure pump with internal power limiting arrangement |
| 03/12/1991 | US4998862 Air compressor pressure regulating valve system |
| 03/07/1991 | WO1991002904A1 Pressure oil feed circuit device for hydraulic cylinder of operation machine |
| 03/07/1991 | DE3929500A1 Multiple-plunger pump - has springs between driving members and plungers varying displacement dependent on working pressure |
| 03/06/1991 | EP0415317A2 No-return security apparatus |
| 03/06/1991 | EP0415311A2 Valve and device using the same |
| 02/27/1991 | EP0414364A1 Calibration of fluid delivery equipment |
| 02/27/1991 | EP0413728A1 Lift valve in a rotary screw machine |
| 02/26/1991 | CA1280638C Gear pump having conditional dry valve closure structure |
| 02/22/1991 | CA2022015A1 Calibration of fluid delivery equipment |
| 02/21/1991 | WO1991002167A1 Device for controlling hydraulic pump |
| 02/21/1991 | WO1991002162A1 Hydraulic pump control device for construction machinery |
| 02/21/1991 | WO1991002156A1 Piston pump |
| 02/19/1991 | US4994984 System and device for supplying desired liquid volumes by means of a metering pump in variable flow rate condition |
| 02/19/1991 | US4993922 Air compressor unloader system |
| 02/19/1991 | US4993921 Power transmission |
| 02/19/1991 | US4993920 Air mattress pumping and venting system |
| 02/07/1991 | DE4024242A1 Valve element head for radial piston pump - has stepped profile which gives linear delivery characteristics |
| 02/07/1991 | DE3931699A1 Cold starting hydrostatic drive - involves heater in hydraulic oil tank |
| 02/06/1991 | EP0220187B1 Flow regulating device for a rotary piston pump |
| 02/06/1991 | CN1011478B Pump control system |
| 02/05/1991 | US4990057 Electronic control for monitoring status of a compressor |
| 01/31/1991 | DE3924118A1 Lubricator for machines with one lubricating head - at least has return valve connection with piston cylinder unit |
| 01/30/1991 | EP0410570A2 Air conditioner apparatus with starting control for parallel operated compressors based on high pressure detection |
| 01/29/1991 | US4987913 Apparatus and method for controlling operation of storm sewage pump |
| 01/24/1991 | WO1991001062A1 Method of and device for controlling induction motor for compressor |
| 01/22/1991 | US4987013 Process for lining pipe |
| 01/22/1991 | US4986919 Chromatographic pumping method |
| 01/22/1991 | US4986738 Airflow control system pump and housing |
| 01/20/1991 | CA2021596A1 Pump structure |
| 01/16/1991 | EP0407436A1 Motor propulsion, in particular for an automobile vehicle and vehicle comprising such a unit. |
| 01/15/1991 | US4985015 Dosing device for controlled injection of liquid from a reservoir into an organism |
| 01/09/1991 | EP0406562A2 Apparatus and method to test for valve leakage in a pump assembly |
| 01/09/1991 | CN1048436A Gas pressure balance and safety in pumping unit |
| 01/08/1991 | US4983103 Annular plunger pump |
| 01/08/1991 | US4983099 Torque-velocity control for variable displacement hydraulic motor |
| 01/08/1991 | US4982466 Body support system |
| 01/08/1991 | CA1278843C Flow control system using boyle's law |
| 01/02/1991 | CA1278497C Power transmission |
| 12/27/1990 | WO1990015931A1 A loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor |
| 12/27/1990 | EP0404540A1 A system for controlling a pump apparatus |
| 12/27/1990 | CA1278358C Process for determining the exact output of dispensing pumps |