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| Number | Title | Issue Date |
| 7354553 | Method and apparatus for detecting the presence of elemental mercury in a gas sample An improved elemental mercury analyzer utilizes a fluorescence assembly in combination with a fluorescence quenching reduction mechanism to detect the concentration of elemental mercury within an emission gas sample, via fluorescence of the mercury within the gas sa... | 04/08/2008 |
| 7320220 | EGR valve having integrated motor, controller, and flow meter A valve arrangement for an internal combustion engine is disclosed. The valve arrangement may have a housing at least partially defining a venturi passageway, a first port disposed at an entrance to the venturi passageway, and a second port disposed at a throat of t... | 01/22/2008 |
| 7185675 | Reduced gain thrust control valve A reduced gain thrust control valve for use in a rocket engine has a housing with a fluid inlet and a piston and cylinder unit for controlling a fluid output of the control valve. The fluid inlet is formed by at least one metering element formed in the housing. The ... | 03/06/2007 |
| 7153341 | Processes for controlling regenerative sweep air for membrane systems A process for controlling the volume of dry air, dried to a predetermined degree of dryness, from a sweep manifold of an air dryer system, flowing over a plurality of gas/liquid fluid separating membranes, comprising: diverting a predetermined volume of dried air to... | 12/26/2006 |
| 6871661 | Combination fitting A combination fitting for flow control devices in an automotive power steering system having channels disposed in the fluid receiving end of the fitting. ... | 03/29/2005 |
| 6799599 | Valve The invention relates to a valve that comprises at least one pump connection (10), one tank connection (14) and one consumer connection (18), and a valve piston (22) that is displaced within the valve box (12). Said valve piston se... | 10/05/2004 |
| 6581623 | Auto-switching gas delivery system utilizing sub-atmospheric pressure gas supply vessels An auto-switching sub-atmospheric pressure gas delivery system, for dispensing gas to a gas-consuming process unit, e.g., a semiconductor manufacturing tool, without the occurrence of pressure spikes or flow perturbations.... | 06/24/2003 |
| 6554027 | Electromagnetically controlled seat valve An electromagnetically controlled pressure regulating valve includes a hollow housing bounding a user channel having one end to be connected to a hydraulic medium user and another end, and respective supply and a discharge channels communicating with the ... | 04/29/2003 |
| 6328056 | Proportional bypass valve with dual variable orifice An unbalance compensated bypass valve (14, 21, 23) for a gas turbine engine fuel supply system is responsive to the fuel pressure differential across a fuel metering valve (15) to open and close a bypass orifice (37, 39, 41; 89, 91, 93; 99, 101, 103). The... | 12/11/2001 |
| 6189312 | Fuel metering arrangement for a gas turbine engine A fuel metering arrangement has a fuel flow metering valve, a pressure drop regulator valve arranged and operable to maintain the pressure drop across the metering valve substantially constant and a throttle device arranged and operable to regulate fuel f... | 02/20/2001 |
| 5908367 | Flow rate control valve and continuously variable automatic transmission provided with same A fluid is guided inside a spool in which an orifice and drain holes are formed. The spool is displaced according to a hydraulic fluid pressure difference across the orifice. An outflow port, which is always connected with the orifice, and a drain passage... | 06/01/1999 |
| 5887612 | Hydraulic pump apparatus A hydraulic apparatus as used for providing fluid to a steering gear of an automotive vehicle includes a housing (10) having a valve bore (14) housing a relief valve spool (94) disposed therein and slidable between a first and second position. A discharge... | 03/30/1999 |
| 5819778 | Flow control device of power steering system In a power steering system which has a fluid pump and a hydraulic actuator, there is used a flow control device which comprises a spool unit slidably received in a spool receiving bore in a manner to partition the bore into first and second pressure chamb... | 10/13/1998 |
| 5819777 | Flow control device A flow control device or valve used in a power steering system of an automotive vehicle. The flow control device comprises a housing formed with an axially extending hole in which a spool valve is movably disposed. A first pressure chamber is defined in t... | 10/13/1998 |
| 5706849 | Flow control valve In a flow control valve, a valve spool is movable for variably controlling an opening area of a port portion of a drain passage so that a necessary flow rate of fluid is conducted from a first pressure chamber to an outlet passage through a control orific... | 01/13/1998 |
| 5609178 | Pressure-actuated valve and method A downhole valve 10 opens or closes a bypass (12,13) in response to the pressure of the fluid in the valve. The valve housing body 14 is adapted for fluid communication with a tubular within a well bore. The valve bypass may be repeatedly cycled from open... | 03/11/1997 |
| 5513672 | Valve assembly A valve assembly for controlling volume flow from a discharge device to an actuator and including a discharge throttle, and a flow control valve for controlling flow through the throttle and having a piston, and end portion of which overlaps a channel for... | 05/07/1996 |
| 5431183 | Flow regulator valve A flow regulator valve that is intended particularly for positive-displacement pumps for auxiliary power steering systems in motor vehicles contains in a valve borehole (1) a flow regulator piston (3) that is guided in an axially movable and sealing manne... | 07/11/1995 |
| 5375620 | Self-adjusting flow metering device A self-adjusting flow metering device is provided for regulating a secondary flow in volumetric proportion to a main flow from which the secondary flow is taken. The device includes a flow sensitive orifice which automatically adjusts its orifice area in ... | 12/27/1994 |
| 5368061 | Load sensed variable discharge fixed displacement pump control with low unload features A load sensed variable output gear pump having adjustable high pressure compensation, tuneable response, low unloading pressure and variable pressure drop adjustability. It comprises a unitary housing enclosing a pump which pumps through a main inlet-outl... | 11/29/1994 |
| 5333454 | Flow control valve unit A connector 5 having an outlet 4 for delivering a pressure oil to a power steering apparatus PS is secured in an opening of a valve receiving bore 2 in which a flow controlling spool valve 3 is received. The connector 5 includes an axial bore 5a which con... | 08/02/1994 |
| 5218989 | Flow control valve A flow control valve unit for controlling flow rate of a pressurized working fluid flowing from a hydraulic pump to an actuator of a power steering device includes a spool chamber, a spool valve, an inlet port, a discharge port, a drain port and a notch. ... | 06/15/1993 |
| 5170626 | Hydraulic flow control system for automotive vehicle A hydraulic circuit supplies a controlled hydraulic flow rate to a hydraulically operated automotive component, such as, a power steering unit for satisfying the characteristic function thereof. The hydaulic circuit includes therein a flow control valve u... | 12/15/1992 |
| 5014734 | Quick drop valve Quick drop valves are usable in hydraulic circuits in which fluid is expelled from a hydraulic cylinder due to gravity force acting on a load connected to the hydraulic cylinder. The present quick drop valve has a sleeve carried by a valve member for esta... | 05/14/1991 |
| 4921547 | Proportional priority flow regulator A proportional priority flow regulator valve structure comprising a cartridge-type modulated orifice valve element (MOS) in a composite multiple element valve assembly. The MOS valve operates in an hydraulic circuit to receive pressurized fluid from a sou... | 05/01/1990 |
| 4887632 | Flow control apparatus A flow control valve includes a cylinder in which an inflow port, an outflow port and a return port are formed. A spiral choke is formed between the inflow and outflow ports. A working oil introduced from the inflow port into the cylinder flows out from t... | 12/19/1989 |
| 4738330 | Hydraulic drive system for use with vehicle power steering pump A hydraulic drive system for use with a vehicle power steering pump has a hydraulic motor connected in series with a power steering mechanism and a bypass line extending in bypassing relationship with the motor. A bypass valve is disposed in the bypass li... | 04/19/1988 |
| 4701111 | Regulation of vane pumps A regulatable vane pump is provided with a piston operable by differential pressure responsive to booster steering flow demand wherein the piston movement controls a choke bore flow area. The differential pressure is effected by pump pressure on one face ... | 10/20/1987 |
| 4598730 | Flow control valve A flow control valve comprising spool means and overload relief valve means built in the spool means. A filter is disposed on the upstream side of the relief valve means. When a hydraulic oil is passed through the filter, foreign materials are removed fro... | 07/08/1986 |
| 4583567 | Valves A valve is proposed for regulating and balancing the pressure in two fluid pressure systems. The valve comprises a balance piston and a regulating piston. The balance piston is acted on by the pressures in each of the two systems and the regulating piston... | 04/22/1986 |
| 4549566 | Flow volume control device for power steering system A flow volume control device for use in a power steering system, which comprises: a casing having an inlet port, a reflux port and a delivery port; a fluid passage formed in the casing in communication with the inlet, reflux and delivery ports; fixed orif... | 10/29/1985 |
| 4519417 | Devices for controlling flow of fluid under pressure A system for controlling flow of fluid along a conduit from a source of fluid under pressure to a consumer device comprises a primary throttle for connection in the conduit and controllable between a first condition in which it is at least partially close... | 05/28/1985 |
| 4505293 | Fluid flow control valve A valve which is arranged to output from a passage 12 a substantially constant-rate flow of fluid, notwithstanding changes in the flow rate entering the valve by passage 11, is arranged to provide an output from passage 12 which is variable with the stati... | 03/19/1985 |
| 4495962 | Fluid control valve A fluid control valve assembly for use in a hydraulic system, comprises: a valve body having a valve cavity extending axially thereof and fluid inlet and outlet ports communicating respectively with discharge and suction ports of a fluid feed pump; a valv... | 01/29/1985 |
| 4396033 | Flow volume control device for a power assisted steering device A flow volume control device for a power assisted steering device having a main control valve device, whose main valve spool is movable to establish the communication of an inlet passage with a bypass passage when the flow rate of pressurized fluid suppli... | 08/02/1983 |
| 4365645 | Three-way flow-regulating valve A three-way or three-ported flow-regulating valve for use in a hydraulic system comprises a two-position two-ported throttle valve inserted between an inflow conduit and an outflow conduit and a pressure-relief valve connected to the inflow conduit at an ... | 12/28/1982 |
| 4361166 | Flow controlling apparatus for power steering, operating fluid A hydraulic fluid discharged from a pump is delivered to a power steering device from a supply passage through a restricted passage and a throttled passage so that as the flow through the supply passage increases in response to an increase in the number o... | 11/30/1982 |
| 4356835 | Hydraulic control valve for selectively supplying fluid to hydraulic services A hydraulic control valve provides controlled fluid supply for two hydraulic services having different flow and pressure requirements, as for example a lift service of a lift truck for lifting loads vertically and a tilting service for tilting loads forwa... | 11/02/1982 |
| 4355655 | Hydraulic control apparatus for load independent flow regulation A hydraulic flow control apparatus is provided which is adapted to provide a constant pressure differential between a pump and an external load. The apparatus includes a housing, and a balance piston slideably mounted therein. The pump pressure acts to bi... | 10/26/1982 |
| 4343324 | Flow control valve A flow-control valve exhibits a flow-drooping characteristic such that the liquid supply into an oil pressure mechanism is decreased in response to an increase of the amount of liquid discharge from a pump. The pump outlet passage forms branches into a fl... | 08/10/1982 |
