| 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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| 12/26/1990 | CN2068163U Electricity-saving cabinet for air compressor |
| 12/26/1990 | CN1010968B Servo system |
| 12/25/1990 | US4980059 Liquid chromatograph |
| 12/25/1990 | US4979970 Method of manufacturing integrated optical component |
| 12/25/1990 | US4979877 Wobble plate type refrigerant compressor |
| 12/20/1990 | DE3919667A1 Control system for double compressor unit - has arrangement to vary main load on alternate basis |
| 12/19/1990 | EP0402871A2 Control device for variable displacement pump |
| 12/13/1990 | WO1990015252A1 Low pressure recirculation valve |
| 12/13/1990 | WO1990015249A1 Variable displacement pump |
| 12/12/1990 | EP0401485A1 A compressor unit for the production of compressed air for industrial uses |
| 12/12/1990 | CN1047723A Power transmission |
| 12/12/1990 | CN1010795B Input power control system of pump in fluid driving apparatus |
| 12/11/1990 | US4976592 Variable capacity vane compressor |
| 12/11/1990 | US4976590 Fluid conduit-responsively adjustable pump arrangement and pump/conduit arrangement and method, and fluid conduits therefor |
| 12/07/1990 | CA2018296A1 Apparatus and method to test for valve leakage in a pump assembly |
| 12/06/1990 | CA2014077A1 Compressor unit for the production of compressed air for industrial uses |
| 12/05/1990 | EP0400507A2 High pressure unit |
| 11/30/1990 | CA2016448A1 Low pressure recirculation valve |
| 11/29/1990 | DE4015780A1 Compression control for electromagnetic reciprocating-piston pump |
| 11/27/1990 | US4972709 Pump control system, level sensor switch and switch housing |
| 11/22/1990 | EP0398209A1 Reciprocating oil pump |
| 11/21/1990 | CN1047140A Control apparatus used for refrigerant circuit having compressor with variable displacement mechanism |
| 11/15/1990 | WO1990013762A1 Variable capacity pump controller of hydraulically driven wheel |
| 11/15/1990 | WO1990013745A1 An electronic control for monitoring status of a compressor |
| 11/13/1990 | US4969801 Method and apparatus for shutting off a compressor when it rotates in reverse direction |
| 11/13/1990 | US4969334 Overspeed protection method for an automotive engine driven air conditioning compressor |
| 11/08/1990 | DE3914485A1 Controlling delivery flow and pressure in pump - involves combination of pilot valve and throttle valve |
| 11/08/1990 | DE3914342A1 Centrifugal pumping plant with electronic characteristic setting - secures redn. of speed and power as vol. flow increases from zero throughout range of control |
| 11/07/1990 | EP0396328A1 A pump/motor control mechanism |
| 11/07/1990 | CN1046778A Apparatus for controlling volume of pumps or motor |
| 11/06/1990 | US4968934 Magnetic marking apparatus for magnetically measuring displacement of a moveable element in a well |
| 11/06/1990 | US4968338 Inverter controlled air conditioner with optimum determination for over current detection |
| 11/06/1990 | US4968227 Variable displacement fluid pump with improved wideband neutral |
| 11/06/1990 | US4968221 Intake valve for vacuum compressor |
| 11/06/1990 | US4968218 Method of controlling the air output of a screw compressor |
| 10/30/1990 | US4966531 Variable displacement vane compressor |
| 10/30/1990 | US4966529 Stroke detection correcting system for variable displacement type compressor |
| 10/30/1990 | US4966013 Method and apparatus for preventing compressor failure due to loss of lubricant |
| 10/30/1990 | CA1275641C Micro-processor control of a movable slide stop and a movable slide valve in a helical screw rotary compressor with an economizer inlet port |
| 10/24/1990 | EP0394061A2 Variable-stroke crank mechanism |
| 10/24/1990 | EP0393950A1 Control apparatus used for refrigerant circuit having a compressor with a variable displacement mechanism |
| 10/24/1990 | EP0393688A2 A hydraulic control system |
| 10/23/1990 | US4965713 Terminal element |
| 10/23/1990 | US4964985 Liquid chromatograph |
| 10/23/1990 | US4964533 Pumping system |
| 10/16/1990 | US4963075 Radial diaphragm pump |
| 10/10/1990 | EP0391064A1 Intake valve for vacuum compressor |
| 10/04/1990 | WO1990011449A1 Control arrangement for a two-cylinder pump for thick materials |
| 10/03/1990 | EP0390628A1 Motor pump unit with a temperature control device on the outlet branch |
| 10/02/1990 | US4960366 Slant plate type compressor with variable displacement mechanism |
| 10/02/1990 | US4960152 Device for compensating by supplying a measured amount of fluid and its application for replenishing a hydraulic circuit |
| 09/25/1990 | US4958989 Digital fluid control of a pressure compensated pump |
| 09/20/1990 | WO1990010793A1 Device for a variable displacement hydrostatic pump |
| 09/20/1990 | DE3908610A1 Arrangement for generating compressed air |
| 09/19/1990 | EP0283348B1 Hydraulic pumps |
| 09/19/1990 | EP0171392B1 Load responsive system |
| 09/18/1990 | CA1274095A1 Oil management in a parallel compressor arrangement |
| 09/13/1990 | DE3844401A1 Variable delivery (displacement, volume) pump having hydraulic displacement for controlling the delivery rate (volumetric capacity) and/or pressure for at least two consumers (loads) |
| 09/12/1990 | EP0386703A2 Controller for underwater pump |
| 09/12/1990 | EP0385977A1 Hydraulic pump with integrated sump and accumulator |
| 09/11/1990 | US4955795 Scroll apparatus control |
| 09/05/1990 | EP0385501A2 Constant feed water device |
| 09/05/1990 | EP0385211A1 Rotary hydraulic machine |
| 09/05/1990 | CN1045160A Wobble plate type refrigerant compressor |
| 08/29/1990 | EP0383810A1 Rotary displacement compressor |
| 08/28/1990 | US4952372 Peristaltic pump to control delivery |
| 08/28/1990 | CA1273268A1 Dual pressure displacement control system |
| 08/22/1990 | EP0383546A2 Fuel injection pump |
| 08/22/1990 | EP0383029A2 Pressure washer with bypass |
| 08/22/1990 | EP0382921A1 Reed valve |
| 08/14/1990 | US4948345 Variable capacity compressor having a widened variable range of capacity |
| 08/14/1990 | US4948340 Above-ground storage system |
| 08/08/1990 | EP0380771A1 Method and apparatus for manufacturing casings, especially long casings, for excentric screw pumps or motors |
| 08/08/1990 | EP0289513B1 An arrangement for changing the pressure in pneumatic or hyd-raulic systems |
| 08/07/1990 | US4947153 Apparatus for monitoring the flow of fluid from a metering pump |
| 07/27/1990 | WO1990008602A1 High-pressure cleaning appliance |
| 07/26/1990 | DE3902131A1 Hydraulic anti-lock brake system for motor vehicles |
| 07/26/1990 | DE3900888A1 Radial piston machine |
| 07/24/1990 | US4943279 Medical pump with infusion controlled by a detachable coded label |
| 07/24/1990 | US4943212 Means for feeding fluid into a pressure conduit |
| 07/24/1990 | US4943210 Pump control system, level sensor switch and switch housing |
| 07/24/1990 | US4942737 Drive control system for hydraulic construction machine |
| 07/17/1990 | US4941807 Hydraulic power generating pack |
| 07/17/1990 | US4941505 Oil supply system for a burner nozzle including means for preventing the nozzle from dripping |
| 07/17/1990 | US4941502 Low pressure recirculation valve |
| 07/17/1990 | CA2007850A1 Pressure washer with spring-less outlet to inlet bypass |
| 07/17/1990 | CA1271666A1 Pressure sensor for use in a diaphragm pump |
| 07/12/1990 | DE3844399A1 Variable-displacement pump for a plurality of consumers which can be actuated independently of one another |
| 07/10/1990 | US4940395 Scroll type compressor with variable displacement mechanism |
| 07/10/1990 | US4940035 Internal combustion engine fuel |
| 07/05/1990 | DE3938521A1 Hydrostatic radial piston machine - has adjustable centre offset between guide |
| 07/05/1990 | DE3844403A1 Variable-displacement pump with a pump control valve |
| 07/05/1990 | DE3844398A1 Control (controlled volume) pump |
| 07/04/1990 | EP0375944A2 Variable-discharge high pressure pump |
| 07/03/1990 | US4938666 Staged unloading of cylinder bank |
| 07/03/1990 | US4938663 Air compressor malfunction detector |
| 06/28/1990 | WO1990007061A1 Pumping system for obtaining high vacuum |
| 06/28/1990 | WO1990006781A1 Fluid flow control apparatus |
| 06/27/1990 | EP0375207A2 Scroll apparatus control |
| 06/26/1990 | US4936747 Compressor with condition responsive cut-off means |