| Patents for F04C 28 - Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids (4,928) |
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| 06/06/2000 | US6071099 Scroll compressor having a discharge muffler |
| 06/02/2000 | WO2000031419A1 Vacuum pump |
| 05/31/2000 | EP1004774A2 Tank mounted rotary compressor |
| 05/31/2000 | EP1004773A1 Multi-stage capacity control scroll compressor |
| 05/31/2000 | EP0742869B1 Scroll-type fluid displacement device having high built-in volume ratio and semi-compliant biasing mechanism |
| 05/31/2000 | DE19854243A1 Vacuum pump has valve between pump drive coupling and load that opens a medium connection at first vacuum in load and closes it at second, lower vacuum level |
| 05/24/2000 | EP1002197A1 Compressor minimum capacity control |
| 05/17/2000 | EP1001173A1 Screw compressor with adjustable full-load capacity |
| 05/17/2000 | CN1253239A Oilless lubricating screw type compressor |
| 05/16/2000 | US6062827 Rotary pump |
| 05/09/2000 | US6059540 Lubrication means for a scroll-type fluid displacement apparatus |
| 05/03/2000 | EP0997645A1 Scroll type fluid machine |
| 05/03/2000 | EP0996824A1 Single-source gas actuation for screw compressor slide valve assembly |
| 04/27/2000 | DE19848413A1 Combined electric motor-pump unit e.g. for automobile central locking device, has electric motor and air pump contained in separate housings releasably coupled together |
| 04/26/2000 | EP0811122B1 Pump having relief valve seat free of direct structural restraint |
| 04/19/2000 | EP0993554A1 Improvements to impeller pumps |
| 04/18/2000 | US6050784 Compressor having capacity-controlling mechanism with abrasion-free cylinder |
| 04/13/2000 | WO2000020808A1 Refrigerating cycle |
| 04/11/2000 | US6047557 Adaptive control for a refrigeration system using pulse width modulated duty cycle scroll compressor |
| 04/06/2000 | WO2000019103A1 Lift valve for a rotary screw compressor |
| 04/05/2000 | CN1249403A Bearing lubricating system for vortex type compressor |
| 04/05/2000 | CN1249402A Positive displacement pump |
| 04/05/2000 | CN1249401A Axial compliant cyclic medium pressure chamber with steps for vortex type compressor |
| 04/04/2000 | CA2131513C Method and apparatus for selectively varying the flow rate of service liquid through a two stage liquid ring vacuum pump |
| 03/29/2000 | EP0989286A1 Two stage rotary vane motor |
| 03/29/2000 | EP0988494A1 Start-up method and apparatus in refrigeration chillers |
| 03/28/2000 | US6042344 Control of scroll compressor at shutdown to prevent unpowered reverse rotation |
| 03/22/2000 | EP0987440A1 Capacity control scroll compressor |
| 03/22/2000 | EP0811123B1 Gas actuated slide valve in a screw compressor |
| 03/16/2000 | DE3745097C2 Hermetisch gekapselte Motor-Kompressor-Einheit Hermetically sealed motor-compressor unit |
| 03/16/2000 | DE3745096C2 Rotationskolbenmaschine nach dem Spiralprinzip Rotary piston machine according to the spiral principle |
| 03/16/2000 | DE19942685A1 Spiral compressor with compression mechanism compressing gaseous fluid together with motion along spiral path compressed to produce compressed gas with output flow path |
| 03/15/2000 | CN1247278A Oldam's coupling of whirl compressor |
| 03/14/2000 | US6036457 Relief valve which does not protrude beyond a compression housing |
| 03/14/2000 | US6036450 Variable capacity vane compressor |
| 03/14/2000 | US6035651 Start-up method and apparatus in refrigeration chillers |
| 03/08/2000 | CN1246604A Scroll compressor with unloading valve between energy-saving device and suction device |
| 03/08/2000 | CN1246583A Sealed compressor driven by motor |
| 03/07/2000 | US6032472 Motor cooling in a refrigeration system |
| 03/07/2000 | CA2099989C Multi-stage gas compressor incorporating bypass valve device |
| 03/01/2000 | EP0982498A1 Capacity control scroll compressor |
| 03/01/2000 | EP0982497A1 Compressor capacity modulation |
| 03/01/2000 | CN1245869A Load regulation for compressor |
| 02/29/2000 | US6031610 Multi-lobe pump for particle counters |
| 02/29/2000 | US6030194 Gerotor motor and improved valve drive and brake assembly therefor |
| 02/29/2000 | US6030181 Vacuum apparatus and a method of controlling a suction speed thereof |
| 02/25/2000 | CA2280533A1 Two-stage rotary vane motor |
| 02/22/2000 | US6027315 Inlet control valve for compressors |
| 02/22/2000 | US6027311 Orifice controlled bypass system for a high pressure air compressor system |
| 02/16/2000 | EP0979946A1 Variable displacement compressor |
| 02/15/2000 | US6024547 Power-variable compressor and air conditioner using the same |
| 02/08/2000 | US6022203 Variable-displacement screw-type compressor |
| 02/02/2000 | EP0975875A1 Vacuum pump system fitted with a liquid mechanical pump |
| 02/02/2000 | EP0792434B1 System and method for performing cooling |
| 02/02/2000 | CN1243563A Vacuum pump |
| 02/01/2000 | US6018957 Method and apparatus for controlling beats and minimizing pulsation effects in multiple compressor installations |
| 01/26/2000 | EP0974754A2 Screw compressor |
| 01/26/2000 | CN1242478A Oil level sight glass for compressor |
| 01/25/2000 | US6017205 Scroll compressor |
| 01/25/2000 | US6017192 System and method for controlling screw compressors |
| 01/25/2000 | CA2156092C Scroll compressor |
| 01/19/2000 | EP0973017A1 Oil level sight glass for a compressor |
| 01/19/2000 | EP0972944A2 Control of scroll compressor at shutdown to prevent unpowered reverse rotation |
| 01/19/2000 | EP0972942A2 Scroll compressor with unloader valve between economizer and suction |
| 01/18/2000 | CA2052350C Scroll type compressor |
| 01/11/2000 | CA2055907C Rotary type multi-stage gas compressor |
| 01/05/2000 | EP0969209A2 Scroll-type variable-capacity compressor |
| 12/30/1999 | DE19928808A1 Spiral compressor |
| 12/29/1999 | CN1240017A Improved gas actuated slide valve in screw compressor |
| 12/29/1999 | CN1239757A Rotary compressor having plurality of compression chambers for multistage compression |
| 12/22/1999 | EP0964999A1 Vacuum pump |
| 12/21/1999 | US6004109 Apparatus for the rapid evacuation of a vacuum chamber |
| 12/21/1999 | US6003324 Multi-rotor helical screw compressor with unloading |
| 12/16/1999 | WO1999064744A1 Multi-stage capacity control scroll compressor |
| 12/15/1999 | EP0963507A1 Rotary device with means for monitoring and adjusting the clearance between the rotors |
| 12/09/1999 | WO1999063229A1 Screw compressor with adjustable full-load capacity |
| 12/08/1999 | EP0962658A2 Reverse rotation detection for compressors |
| 12/07/1999 | US5996364 Scroll compressor with unloader valve between economizer and suction |
| 11/30/1999 | US5993177 Scroll type compressor with improved variable displacement mechanism |
| 11/30/1999 | US5993171 Scroll-type compressor with variable displacement mechanism |
| 11/23/1999 | US5989000 Scroll compressor with back pressure hole relief |
| 11/18/1999 | DE19919104A1 Compressor with variable output for cooling or coolant cycle for motor vehicle improves the fuel efficiency of the vehicle engine and can be produced at relatively low cost |
| 11/17/1999 | EP0957266A1 Scroll-type compressor |
| 11/17/1999 | EP0956451A2 Gerotor pump for liquid media |
| 11/17/1999 | CN1235245A Scroll-type compressor |
| 11/09/1999 | US5979168 Single-source gas actuation for screw compressor slide valve assembly |
| 11/02/1999 | US5975860 Vibration torsion system damper for a shaft of a compressor |
| 11/02/1999 | US5975857 Process for operating a dry-compression vacuum pump as well as a suitable vacuum pump for implementation of this process |
| 11/02/1999 | US5975854 Compressor with protection module |
| 10/28/1999 | WO1998035134A9 Rotary device with means for monitoring and adjusting the clearance between the rotors |
| 10/07/1999 | WO1999050561A1 Vacuum pump |
| 10/07/1999 | WO1999050560A1 Screw rotor compressor having a movable wall portion |
| 10/05/1999 | US5961297 Oil-free two stage scroll vacuum pump and method for controlling the same pump |
| 09/30/1999 | WO1999049219A1 Screw rotor type wet vacuum pump |
| 09/28/1999 | CA2182446C Apparatus and method for electronically controlling inlet flow and preventing backflow in a compressor |
| 09/21/1999 | US5954482 Compressor having pressure eliminating means |
| 09/16/1999 | WO1999046506A1 Scroll compressor with structure for preventing reverse rotation |
| 09/15/1999 | EP0942173A1 Compressor unit and control device used thereby |
| 09/15/1999 | EP0791201A4 Vibration monitoring system |
| 09/14/1999 | US5951266 Evacuating apparatus having interengaging rotors with threads having a decreasing pitch at the exhaust side |