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| Number | Title | Issue Date |
| 7117120 | Control system for centrifugal pumps A control system for the operation of a centrifugal pump which may be used for production of gas and/or oil from a well. The control system includes vector feedback model to derive values of torque and speed from signals indicative of instantaneous current and volta... | 10/03/2006 |
| 7059838 | Control device for positive displacement pumps A control device for a positive displacement pump includes a throttle device and a flow control valve. The flow control valve includes a flow control piston and is configured to regulate an unrequired excess flow of the pump at an increased speed. The throttle devic... | 06/13/2006 |
| 7033147 | Centrifugal fluid pump assembly with flow rate calculating section A centrifugal fluid pump assembly includes a body section and a control mechanism 6. The body section includes a housing, an impeller rotatable within the housing, and a motor for rotating the impeller. The pump assembly includes a motor current flow rate-related da... | 04/25/2006 |
| 6966967 | Variable speed pump control A method and apparatus for monitoring operating characteristics and/or control signals of a system comprising a variable speed vacuum pump. Operating characteristics and/or control signals of the system may be monitored, and the pumping speed of the variable speed v... | 11/22/2005 |
| 6932583 | Multiple stage pump with multiple external control valves A multiple stage pump having valves downstream from each respective pump in a same line thereof. The respective lines then merge into a common line. The multiple stage pump prevents pressure variations. The multiple stage pump includes a first pump in a first stage ... | 08/23/2005 |
| 6902378 | Electronically controlled vacuum pump A vacuum system comprises, as an integral assembly, a vacuum pump with drive motor, a purge valve, a roughing valve and an electronic control module. A cryogenic vacuum pump and a turbomolecular vacuum pump are disclosed. The control module has a programmed processo... | 06/07/2005 |
| 6863505 | Wind driven high pressure water pump This invention relates to a wind mill which is designed to convert rotational energy to mechanical energy to drive one or more pistons to raise a liquid such as water to an elevated location if necessary at a positive pressure. In addition, the present invention may... | 03/08/2005 |
| 6736604 | Control apparatus of variable displacement pump for power steering apparatus First and second fluid pressure chambers are formed in both sides of a movement direction of a cam ring swingably placed within a pump body. A spool of a control valve is moved due to a pressure difference between the front and back of a metering orifice. Fluid pres... | 05/18/2004 |
| 6602057 | Management and optimization of load sharing between multiple compressor trains for controlling a main process gas variable A control system is provided for load sharing between a plurality of compressors. The control system determines the actual coefficients of export flow for the compressors, compares the actual coefficients of export flow with a common or individual coeffic... | 08/05/2003 |
| 6592340 | Control system for a vacuum pump used for removing liquid and a method of controlling said pump A control system for a vacuum pump used for removing liquid from a suction washer of a pulp mill includes a pump with adjustable rotation speed and means for defining the operating point of the vacuum pump and a control/central unit wherein the performanc... | 07/15/2003 |
| 6585495 | Reversible volume oil impeller pump with mechanical governor A fluid pump is provided that produces an outflow of fluid that is not proportional to the speed of the input drive. Thus, the fluid pump can be tuned to provide a substantially constant outflow of fluid irrespective of the speed of the input drive. The f... | 07/01/2003 |
| 6531842 | Sine wave variable speed drive The present technique utilizes already existing components within a variable speed drive to provide harmonic filtering characteristics. Particularly, the present technique integrates transformers and inductors to provide a filter within the variable speed... | 03/11/2003 |
| 6254767 | Semiconductor device manufacturing apparatus having controller detecting function of filter A semiconductor device manufacturing apparatus. The semiconductor device manufacturing apparatus includes: a tank having an inlet and an outlet, for storing a chemical solution; a pump interposed between the inlet and outlet of the tank, for circulating t... | 07/03/2001 |
| 5816787 | Motion conversion rotator apparatus and method A method and apparatus to convert the torque of a drive shaft into reciprocating energy to drive and pull a piston utilizing a nodal rotator attached to the drive shaft, or alternatively to convert reciprocating energy into torque, said rotator having com... | 10/06/1998 |
| 5779452 | Positive displacement pump or motor utilizing a reciprocal sliding member to operate the suction and discharge ports A central impeller is sandwiched between fixed walls and is driven through a circular path of small radius, but prevented from rotating by a ring-shaped shutter or slider which surrounds and guides it. The shape of the impeller and slider are such that di... | 07/14/1998 |
| 5775883 | Rolling-piston expander apparatus A rolling-piston expander has a hermetic casing 7 provided with a suction pipe 3 and a discharge pipe 5, a cylinder 13 disposed in the casing, a roller 31 eccentrically rotated in the cylinder, an expansion chamber 39 defined by the roller and communicati... | 07/07/1998 |
| 5609475 | Compressor with a hypotrochoidal design having a fluid delivery which is not solely dependent on a drive RPM A compressor with a hypotrochoidal design is constructed in such fashion that its delivery can be varied in ways other than by the drive rpm alone. A controlling edge of an inlet opening that determines the beginning of compression has a variable angular ... | 03/11/1997 |
| 5362209 | Proportional solenoid actuator and pump system including same An actuator for moving a solenoid armature to control fuel in response to a control current is built into a fuel pump, with trapped air in and around the actuator preventing contamination of the actuator by ferromagnetic particles in the liquid fuel from ... | 11/08/1994 |
| 5271719 | Fluid rotating apparatus and method of controlling the same A fluid rotating apparatus of a positive displacement pump includes a plurality of rotors accommodated in a housing, a bearing for rotatably supporting the rotors, a suction port and a discharge port formed in the housing, a suction chamber and a discharg... | 12/21/1993 |
| 5261792 | Reverse osmosis water purifier booster pump system A reverse osmosis water purification system that incorporates a high torque low speed motor to drive a pump, such that the pump can continuously pump water from a source of water to an osmotic membrane The system may have a reservoir to store the purified... | 11/16/1993 |
| 5257914 | Electronic control interface for fluid powered diaphragm pump A pump control interface for use in a diaphragm pump including at least one diaphragm adapted to move between a suction stroke and a discharge stroke during operation of the pump. A diaphragm follower is connected for movement with the diaphragm during op... | 11/02/1993 |
| 5209631 | Arrangement for flooding high speed vacuum pumps The invention describes an arrangement for optimum flooding of high speed vacuum pumps. The actuation of the flood valve (6) is controlled by the forces, which, among other things, are exerted upon the rotor by the flooding process. These forces are deter... | 05/11/1993 |
| 5127576 | Vehicle passenger compartment temperature control system with P.I.D. control of heater servo-valve A system for controlling vehicle passenger compartment comfort. An electronic controller receives input from: (i) a thermistor array sensing blower plenum discharge temperature, (ii) a user movable Level Select Control (iii) a potentiometer sensing the po... | 07/07/1992 |
| 4974664 | Compensating for water pump speed variations in a tempered air system for vehicle passenger compartments An automatic control system for regulating the temperature of blower air discharged over a heater core to a vehicle passenger compartment. A thermistor is disposed to sense discharge air adjacent the heater core and provide a temperature signal. An electr... | 12/04/1990 |
| 4723895 | Method of and apparatus for effecting volume control of compressor A method of and an apparatus for effecting volume control suitable for use with a compressor for compressing a compressible fluid, such as a refrigerant of the refrigeration cycle, wherein a suction fluid is forcedly closed while a suction step is being p... | 02/09/1988 |
| 4714413 | Speed sensitive power steering pump unload valve A positive displacement pump for a vehicle power steering system comprising a rotor (42) rotatable in and cooperating with a stator (20) to define a pump cavity (52), (54), inlet and outlet ports (56), (58) and (34), (36) communicating with the pump cavit... | 12/22/1987 |
| 4609331 | Speed sensitive power steering valve A positive displacement pump for a vehicle power steering system comprising a rotor (42) rotatable in and cooperating with a stator (20) to define a pump cavity (52), (54), inlet and outlet ports (56), (58) and (34), (36) communicating with the pump cavit... | 09/02/1986 |
| 4599051 | Vane type rotary pump A vane type rotary pump comprises a cam ring mounted within a stator housing and having an inner peripheral wall defining four circumferentially equi-spaced semicylindrical inner cam surfaces, a pair of end wall structures fitted to opposite ends of the c... | 07/08/1986 |
| 4452570 | Multiple cylinder rotary compressor A multiple cylinder rotary compressor in which a capacity control is effected in response to a fluctuating load so that a saving of energy to be consumed is contemplated by detecting a rotational frequency of the driving shaft or a temperature of the car ... | 06/05/1984 |
| 4452571 | Multiple cylinder rotary compressor A multiple cylinder rotary compressor in which a capacity control is effected in response to a fluctuating load so that a saving of energy to be consumed is intended by means of such control that a supply of a low-pressure refrigerant gas is interrupted w... | 06/05/1984 |
| 4395203 | Vane compressor having a discharge rate control A vane compressor is provided with a discharge rate control device which comprises valve means arranged to close part of the fluid suction passage leading to the pump working chambers to vary the opening of the fluid suction passage, and valve driving mea... | 07/26/1983 |
| 4249499 | Timing mechanism for a fuel supply system This disclosure deals with a mechanism for adjusting the timing of initiation of injection by a fuel injector of an internal combustion engine. The mechanism includes a piston connected to be moved by a drive for the injector, and another piston which is ... | 02/10/1981 |
| 4047665 | Spray control system The control system is utilized in a high pressure liquid spraying system including an internal combustion engine, a pump driven by the engine, a source of liquid connected to the pump and a spray nozzle assembly connected by a high pressure conduit to the... | 09/13/1977 |
| 4026668 | Control apparatus for silver halide emulsion making The disclosure relates to a control apparatus for the preparation of silver halide emulsions in which the flow rates of the reactants can be controlled to provide a desired pAg in the precipitation vessel. Several embodiments are used, depending upon the ... | 05/31/1977 |
