| 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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| 11/26/1981 | WO1981003362A1 Load sensing porting arrangement |
| 11/25/1981 | EP0040593A1 Automatic unloading valve for a compressor |
| 11/24/1981 | US4302163 Adjustable output pump for liquids |
| 11/24/1981 | US4302158 Automatic pump for deep wells |
| 11/24/1981 | US4302157 High fluid level pump off controller and process |
| 11/11/1981 | EP0039644A1 Return prevention device for a pump shaft |
| 11/03/1981 | US4298315 Positive displacement pump systems |
| 10/27/1981 | US4297083 Positive control system for piston compressor valves |
| 10/27/1981 | CA1111310A1 Adjustable suck-back device for sanitary pumps |
| 10/21/1981 | EP0037838A1 Method of controlling internal combustion engine and hydraulic pump system |
| 10/20/1981 | US4295798 Automatic two-speed pump assembly |
| 10/06/1981 | US4293286 Double action pump |
| 10/06/1981 | US4293284 Power limiting control apparatus for pressure-flow compensated variable displacement pump assemblies |
| 10/06/1981 | US4292805 Servo-valve convertible construction |
| 10/06/1981 | CA1110137A1 Intravenous liquid pumping system and method |
| 09/30/1981 | EP0036792A1 Pressure responsive control device |
| 09/29/1981 | CA1109732A1 Free piston engine pump with energy rate smoothing |
| 09/16/1981 | EP0035569A1 Reciprocating pump |
| 09/15/1981 | US4289454 Rotary hydraulic device |
| 09/15/1981 | US4289452 Pressure compensated pump |
| 09/02/1981 | EP0034591A1 Apparatus for controlling capacity of a multiple-stage cooling system. |
| 09/01/1981 | US4286925 Control circuit for shutting off the electrical power to a liquid well pump |
| 08/26/1981 | EP0034216A1 Hydraulic motor control device |
| 08/25/1981 | US4285639 Electronic control for variable displacement pumps |
| 08/19/1981 | EP0034029A2 A pump for hydraulic fluid |
| 08/19/1981 | EP0034028A2 Improvements in hydraulically-operated anti-skid braking systems for vehicles |
| 08/18/1981 | US4284389 Input torque control system for a variable displacement pump |
| 08/11/1981 | US4282719 Control system for regulating large capacity rotating machinery |
| 08/04/1981 | US4281968 Water storage and pumping system |
| 08/04/1981 | CA1106236A1 Horsepower summation control for variable displacement pumps |
| 08/04/1981 | CA1106235A1 Fluid sensitive shutdown for well pump |
| 07/21/1981 | CA1105358A1 Control circuit for variable displacement pump with venturi bypass control |
| 07/14/1981 | US4278403 Control for hydraulic accumulator system |
| 07/07/1981 | US4277229 High pressure fluid delivery system |
| 07/07/1981 | US4277227 Apparatus for converting a pump to a controller |
| 06/30/1981 | US4275997 Hydraulic pump with proportional pressure controller |
| 06/30/1981 | US4275996 Control device for adjustable fluid pumps or motors |
| 06/30/1981 | CA1104033A1 Pressure and flow compensated control system with constant torque and viscosity sensing over-ride |
| 06/25/1981 | WO1981001729A1 Drive transmission means |
| 06/23/1981 | US4274257 Anti-stall controller |
| 06/23/1981 | CA1103551A1 Apparatus for automatically water charging a centrifugal fire pump |
| 06/16/1981 | US4273517 Control device for an axial piston machine |
| 06/16/1981 | US4273516 Pumps for fluids |
| 06/16/1981 | US4273513 Pump failure protection for liquid transmission pipe lines |
| 06/16/1981 | US4273261 Metering apparatus |
| 06/16/1981 | CA1103219A1 Pressurized fluid flow generator |
| 06/09/1981 | US4272227 Variable displacement balanced vane pump |
| 06/02/1981 | US4270885 Unloading means for a gas compressor |
| 05/26/1981 | US4269569 Automatic pump sequencing and flow rate modulating control system |
| 05/26/1981 | CA1101809A1 Fine tune adjusting mechanism for tandem-operated filling units of a filling machine |
| 05/26/1981 | CA1101784A1 Hydraulic transmission drive assembly with noise attenuation means |
| 05/19/1981 | US4268224 Method of and means for conveying and measuring gases for gas analysis operations |
| 05/19/1981 | CA1101387A1 Trimmer arrangement for filling unit of automatic filling machine |
| 05/12/1981 | US4266523 Electromagnetically actuated pumps |
| 05/05/1981 | US4265267 Flow control device for use with positive displacement pump |
| 05/05/1981 | US4265091 Refrigerant compressor protecting device |
| 05/05/1981 | CA1100455A1 Variable displacement compressor with three-piece housing |
| 04/29/1981 | EP0027743A1 Control system for a hydraulic circuit including a plurality of parallel variable-delivery pumps |
| 04/28/1981 | US4264283 Pump for liquids |
| 04/28/1981 | US4264281 Pump with an automatically adjusted output rate |
| 04/28/1981 | US4263825 Reciprocating stroke length adjustment device and method |
| 04/21/1981 | US4263540 Two-speed refrigerant motor compressor |
| 04/21/1981 | US4262492 Airconditioner |
| 04/16/1981 | WO1981001031A1 Method of controlling internal combustion engine and hydraulic pump system |
| 04/14/1981 | US4261691 Rotary screw machine with two intermeshing gate rotors and two independently controlled gate regulating valves |
| 04/14/1981 | US4261228 Stroke adjustment for reciprocating mechanism |
| 04/14/1981 | CA1099181A1 Control valve for use with variable displacement piston pump of the type including hydrostatic thrust bearing means |
| 04/08/1981 | EP0026586A1 Flow control valve |
| 04/02/1981 | WO1981000889A1 Reciprocating pump |
| 03/31/1981 | US4259039 Adjustable volume vane-type pump |
| 03/31/1981 | US4259038 Method and regulator for controlling the delivery of a pump arrangement according to demand |
| 03/25/1981 | EP0025575A1 Dosage device |
| 03/24/1981 | US4257750 Radial piston pump |
| 03/24/1981 | US4257747 Monitoring machinery by detecting vibrations |
| 03/24/1981 | US4257160 Two-bladed safety razor |
| 03/17/1981 | US4256439 Power control system for multiple pumps |
| 03/11/1981 | EP0024826A1 Input torque control system for a variable displacement pump |
| 03/11/1981 | EP0024645A1 Method and apparatus for controlling the operation of a pump |
| 03/10/1981 | US4255093 Combined lift and metering pump |
| 03/10/1981 | US4255092 Hydraulic variable-displacement axial piston pump having torque limitation |
| 03/10/1981 | US4255088 Liquid pumping system having means for detecting gas in the pump |
| 03/10/1981 | US4254657 Gas detector and meter employing indicator tubes |
| 03/03/1981 | US4253803 Rotary positive displacement pump, especially gear pump |
| 03/03/1981 | CA1096750A1 Hydraulic system with unloading valve assembly |
| 03/03/1981 | CA1096749A1 Hydraulic control apparatus |
| 02/24/1981 | CA1096465A1 Pulse generator |
| 02/24/1981 | CA1096270A1 Hydraulic control system |
| 02/19/1981 | WO1981000446A1 Method and apparatus for controlling capacity of a multiple-stage cooling system |
| 02/17/1981 | US4251193 Flow control valve |
| 02/17/1981 | CA1095810A1 Hydraulic control system |
| 02/10/1981 | US4249866 Control system for screw compressor |
| 02/04/1981 | EP0023323A2 Control device for a hydrostatic transmission or a piston pump |
| 02/03/1981 | US4248574 Hydraulic control system for variable displacement pumps |
| 02/03/1981 | US4248573 Hydraulic control system for variable displacement pump |
| 02/03/1981 | US4248194 Method and apparatus for controlling the operation of a pump |
| 02/03/1981 | US4248137 Feedback mechanism for variable displacement hydraulic device having an electrohydraulic controller |
| 02/03/1981 | US4248054 Refrigeration system with load balancing control for at least three centrifugal compressors |
| 02/03/1981 | US4248053 Dual capacity compressor with reversible motor and controls arrangement therefor |
| 01/28/1981 | EP0022781A1 Gear machine. |
| 01/27/1981 | US4247260 Pressure regulated water supply system |