| Patents for F01L 25 - Drive, or adjustment during operation, of distribution or expansion valves by non-mechanical means (555) |
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| 05/15/1996 | EP0711378A1 A gas driven mechanical oscillator and method |
| 03/20/1996 | CN1118834A Air valve with bleed feature to inhibit icing |
| 02/27/1996 | US5493945 Apparatus for driving piston by fluid pressure |
| 02/08/1996 | WO1996003575A1 Hydraulic switching valve, and a free-piston engine provided therewith |
| 01/17/1996 | EP0692072A1 Pressure medium driven device performing linear motion |
| 01/16/1996 | US5484269 Fluid intensifier |
| 12/07/1995 | WO1995033125A1 A gas driven mechanical oscillator and method |
| 12/07/1995 | CA2168337A1 A gas driven mechanical oscillator and method |
| 11/21/1995 | US5468127 Pilot control valve having means for recovering exhaust fluids |
| 11/14/1995 | US5465646 Hydraulic motor |
| 10/14/1995 | CA2132755A1 Air valve with bleed feature to inhibit icing |
| 09/08/1995 | WO1995023924A1 Pneumatically shifted reciprocating pump |
| 09/08/1995 | CA2191445A1 Pneumatically shifted reciprocating pump |
| 08/31/1995 | WO1995023051A1 Pneumatic impact breaker |
| 08/31/1995 | WO1995023050A1 Pneumatic impact breaker |
| 08/31/1995 | WO1995023049A1 Valve arrangement in compressed air driven motors |
| 08/15/1995 | US5441281 Shaft seal |
| 08/09/1995 | EP0666420A1 Apparatus for driving piston by fluid pressure |
| 06/27/1995 | US5427507 Valving for controlling a fluid-driven reciprocating apparatus |
| 06/06/1995 | US5421711 Downhole pump drive system |
| 05/24/1995 | EP0558585B1 Internal combustion engine with compressor function |
| 01/25/1995 | EP0635096A1 Magnetically actuated fluid motor |
| 01/10/1995 | US5380428 Pump for reverse osmosis system |
| 01/04/1995 | EP0632403A2 Handwritten symbol recognizer |
| 01/03/1995 | US5377719 Pneumatic valve, particularly for control of compressed-air-operated membrane pumps |
| 12/31/1994 | CA2125312A1 Handwritten symbol recognizer |
| 11/22/1994 | US5366353 Air valve with bleed feature to inhibit icing |
| 09/29/1994 | WO1994021915A1 Pressure medium driven device performing linear motion |
| 09/27/1994 | US5349895 Air motor control |
| 09/06/1994 | CA1331849C Pneumatic valve designed to control particularly a compressed-air-operated membrane pump |
| 08/03/1994 | EP0609044A1 An air valving mechanism, in combination with a double diaphragm pump subassembly |
| 08/02/1994 | US5334003 Air valving mechanism, in combination with a double diaphragm pump subassembly |
| 07/26/1994 | CA2113754A1 Air valving mechanism, in combination with a double diaphragm pump subassembly |
| 07/05/1994 | US5326234 Fluid driven pump |
| 07/05/1994 | US5325762 Fluid pressure operated piston engine assembly |
| 06/16/1994 | DE4401680A1 Liq. pressure-driven rainwater pump unit with electronic control - has coupled pumping systems fed from drinking-water supply via inlet and outlet magnetic valves operated by resettable register |
| 05/31/1994 | US5315974 Internal combustion engine with compressor function |
| 05/31/1994 | CA1329894C Apparatus for removing fluid from the ground and method for same |
| 05/24/1994 | CA1329729C Diaphragm pump |
| 05/04/1994 | EP0595116A1 Fluid pressure operated piston engine assembly |
| 05/03/1994 | CA1329052C Fluid-driven pump |
| 04/13/1994 | EP0455698B1 Fluid-powered precision oscillator |
| 01/11/1994 | US5277555 Fluid activated double diaphragm pump |
| 01/11/1994 | US5277098 On-off valve for hydraulic rockdrill |
| 12/28/1993 | US5273405 Fluid cushioning apparatus for hydraulic intensifier assembly |
| 11/18/1993 | EP0426772B1 Self-reversing reciprocating piston pump with hydraulic transmission of the inversion signal |
| 10/28/1993 | WO1993020928A1 Pump for reverse osmosis system |
| 10/14/1993 | WO1993020338A1 Magnetically actuated fluid motor |
| 10/14/1993 | CA2117526A1 Magnetically actuated fluid motor |
| 10/12/1993 | US5252042 Gas booster assembly for fluid pressure piston driving apparatus |
| 10/05/1993 | US5249933 Submarine external hydraulic fluid - isolated system |
| 09/15/1993 | CN2142144Y Pipe straight-through valve |
| 09/14/1993 | US5244361 Pump for reverse osmosis system |
| 09/14/1993 | US5243897 Magnetically actuated fluid motor |
| 09/08/1993 | EP0558585A1 Internal combustion engine with compressor function. |
| 08/25/1993 | EP0556958A1 Air compressor arrangements |
| 08/24/1993 | US5238372 Cooled spool piston compressor |
| 06/29/1993 | US5222876 Double diaphragm pump |
| 06/29/1993 | US5222873 Fluid-driven reciprocating apparatus and valving for controlling same |
| 06/22/1993 | US5220860 Diaphragm valve for percussive apparatus |
| 06/16/1993 | CN1021244C Lift valve in rotary screw machine |
| 05/18/1993 | US5211372 Exhaust valve for a gas expansion system |
| 05/04/1993 | US5207726 Hydraulic pump |
| 03/23/1993 | US5195878 Air-operated high-temperature corrosive liquid pump |
| 02/24/1993 | EP0528714A1 Gas booster |
| 12/29/1992 | US5174322 Automatic two-position four-way pulsating valve |
| 12/22/1992 | US5173035 Reciprocating pump |
| 11/19/1992 | EP0513915A1 Electro-hydraulic actuator |
| 08/12/1992 | EP0498565A1 Pumps |
| 08/12/1992 | EP0412093B1 Pneumatic valve, particularly for control of compressed-air-operated membrane pumps |
| 07/29/1992 | CN2111367U Air chamber channel net valve |
| 07/14/1992 | US5129414 Expansible chamber device having variably restrained valve systems |
| 06/17/1992 | DE4039439A1 Twin chamber hydraulic or pneumatic motor - makes use of permanent magnet to stabilise the valves |
| 06/11/1992 | WO1992009792A1 Internal combustion engine with compressor function |
| 06/10/1992 | EP0489005A1 Multicylinder self-starting uniflow engine |
| 05/12/1992 | US5111843 Expansible chamber device having variably restrained valve systems |
| 04/30/1992 | DE4034442A1 Control system for high pressure pump - uses feedback signals representing pump piston movement to displace control slider |
| 04/28/1992 | US5107678 Floating fluid-operated actuator |
| 04/22/1992 | EP0481208A1 Pneumatic motor |
| 04/21/1992 | US5105720 Oscillating piston controlled by piloted valve, piston position controls pilot valve |
| 04/15/1992 | EP0480192A1 Double-diaphragm pump |
| 01/16/1992 | DE4022341A1 Double acting hydraulic ram - has controlling end covers accommodating hollow stepped control slide between them |
| 01/15/1992 | CN1057885A External combustion rotating type energy saving engine with variable flow path of fluid |
| 11/14/1991 | DE4015308A1 Oscillating hydraulic drive - has two pumps driven from common electric motor |
| 11/13/1991 | EP0455698A1 Fluid-powered precision oscillator. |
| 10/29/1991 | US5060333 Apparatus for cleaning pipelines for beverages and the like with a relief valve in the liquid admitting inlet |
| 10/23/1991 | EP0489005A4 Multicylinder self-starting uniflow engine. |
| 10/09/1991 | EP0450257A1 Hydraulic machine capable of releasing the pressure of one liquid and simultaneously pumping another liquid |
| 09/17/1991 | US5049038 Fluid compressors |
| 08/14/1991 | EP0441100A1 Device for controlling the exhaust valve of an internal combustion piston engine |
| 07/16/1991 | US5031505 Variable frequency control for percussion actuator |
| 06/18/1991 | US5024142 Cyclically operating fluid drive motor with magnetically controlled diaphragm valves |
| 06/11/1991 | US5022309 Piston |
| 05/02/1991 | EP0425113A1 Fluid compressors |
| 02/26/1991 | CA1280641C Mechanical shift, pneumatic assist pilot valve for diaphragm pump |
| 02/19/1991 | US4993924 Reciprocating pump |
| 02/13/1991 | EP0412093A1 Pneumatic valve, particularly for control of compressed-air-operated membrane pumps. |
| 02/07/1991 | WO1991001436A1 Fluid drive motor with magnetically controlled valves |
| 01/16/1991 | EP0408083A1 Aggressive liquids dosage membrane pump |
| 01/02/1991 | EP0405127A1 Pneumatic motor |