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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7735518 | Valve assembly with dual actuation solenoids A solenoid actuated valve assembly includes a valve body having a slidable main valve member and a pilot valve body mechanically connected to the valve body including a slidable pilot valve member. A first solenoid operated valve connected to the pilot valve body wh... | 06/15/2010 |
| 7735517 | Rotary-actuated electro-hydraulic valve A valve for controlling fluid flow in a fluid system is disclosed. The valve includes a housing, a servo spool, and a piston. The servo spool defines a spiral groove and a spiral land. The piston defines an orifice configured to provide flow communication to a suppl... | 06/15/2010 |
| 7726340 | Flexible, hermetic pivot seal for torque motor A torque motor (10) includes a support (20), a jet tube passage (42) in the support having a first end opening (43) and a second end opening (45), a jet tube (30) extending into the jet tube passage (42) through the f... | 06/01/2010 |
| 7455074 | Latchable electrohydraulic servovalve An electro-hydraulic servovalve (EHSV) (10) that includes a nozzle (16), a motor (12) operably connected to the nozzle (16) for controlling the position of the nozzle (16) based on current provided to the motor (12), a spool... | 11/25/2008 |
| 7380571 | Directional control valve A valve accommodating hole (11), and each of a supply port (20), discharge ports (21 and 22), and output ports (23 and 24) connected to the valve accommodating hole are formed in a valve casing (15), and a valve shaft... | 06/03/2008 |
| 7290565 | Methods and apparatus for splitting and directing a pressurized fluid jet within a servovalve A jet reflector servovalve includes a flexure tube and reflector that opposes a fluid nozzle and fluid receivers of the servovalve. During operation, the nozzle directs a pressurized fluid jet toward the reflector. The pressurized fluid travels within a second stage... | 11/06/2007 |
| 7231940 | Control valve for a hydraulic power steering system A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pre... | 06/19/2007 |
| 7210473 | Paintball marker and kit of parts therefor A paintball marker is provided including a body, an inlet control device, a firing system, a first regulator and a second regulator. The body has a paintball inlet and a barrel for receiving a paintball from the paintball inlet. The inlet control device is movable b... | 05/01/2007 |
| 7179390 | Method of filtering a fluid and remote filtering station Filtering of an operating fluid of a mechanical device is performed utilizing a pumping device of the mechanical device which routinely circulated the operating fluid within the mechanical device. A remote filtering station of the present invention has a first condu... | 02/20/2007 |
| 7152627 | Control valve for a hydraulic power steering system A control valve for a hydraulic power steering system includes a pair of flow circuits arranged in parallel. Each flow circuit includes an upstream and downstream flow orifices arranged in series. Each set of orifices defines between the orifices an intermediate pre... | 12/26/2006 |
| 7093607 | Methods and apparatus for maintaining pressure gain in a servovalve assembly A servovalve has a sleeve having both a first metering aperture and a second metering aperture in fluid communication with a single port cavity defined by the servovalve. A spool oriented within the sleeve has a first land and a second land and defines a channel ori... | 08/22/2006 |
| 7056442 | Method and apparatus for flushing contaminants from a container of fluids A contaminant-flushing machine for removing contaminants from a container, such as an engine transmission, air-conditioner coil, or transmission cooler, which includes hoses for coupling to the transmission cooler and a pump for circulating fluid through the hoses a... | 06/06/2006 |
| 6736046 | Pilot control valve utilizing multiple offset slide valves A pilot control valve for controlling a reciprocating pump has a valve member shiftable within a valve body between a first or “downstroke” position and a second or “upstroke” position. In its first and second positions, the valve member positions slide valv... | 05/18/2004 |
| 6640833 | Fail-freeze servovalve The servovalve comprises an electric motor and a distributor valve integrating a hydraulic slide under the control of said electric motor and further comprising two load channels pierced in a central rod on which blocks are mounted for co-operating with c... | 11/04/2003 |
| 6637461 | Electrically operated hydraulic actuator with force feedback position sensing A proportional hydraulic valve has a primary control spool with a force feedback actuator attached to one end, wherein the control spool meters flow of fluid to a work port. The force feedback actuator includes a piston coupled to the control spool and de... | 10/28/2003 |
| 6598622 | Directional valve A directional control valve which has a movable control piston (5) which separates two pressure chambers (6, 8) from each other in the valve housing interior, which pressure chambers can be subjected to control pressure in order to move the control piston... | 07/29/2003 |
| 6543481 | Pilot operated pneumatic valve A pilot operated valve assembly including a valve body having a pressurized air supply inlet port in communication with a source of pressurized air and at least one cylinder passage. A main valve bore extends axially within the valve body and a main valve... | 04/08/2003 |
| 6527010 | Single pilot dual pulse spool valve A spool valve may be used in a subsea system with a single upstream pilot valve to control the spool valve. The spool valve opens and closes a main valve in response to fluid signals from the pilot valve. The main valve is connected to a source of pressur... | 03/04/2003 |
| 6431046 | Pneumatic motor A double acting pneumatic motor having a cylinder, a piston within the cylinder that divides the cylinder into two cavities that vary in volume with movement of the piston, a source of fluid under pressure, and a valve assembly for alternately directing f... | 08/13/2002 |
| 6382934 | Reversing valve for a compressed air membrane pump A reversing valve for a compressed air membrane pump in which an equilibrium state of the main piston in the neutral position, leading to stoppage of the pump, is prevented by disposing the main system piston and the pilot system piston immediately adjace... | 05/07/2002 |
| 6192937 | Pilot operated pneumatic valve A pilot operated valve assembly including a valve body having a pressurized air supply inlet port in communication with a source of pressurized air and at least one cylinder passage. A main valve bore extends axially within the valve body and a main valve... | 02/27/2001 |
| 6109284 | Magnetically-latchable fluid control valve system A hydraulic valve control system that includes a plurality of digitally actuated magnetically-latchable four-way valves that directly or indirectly control the position of a hydraulic actuator. The digitally actuated magnetically-latchable four-way valves... | 08/29/2000 |
| 6039077 | Electrohydraulic control valve arrangement The invention concerns an electrohydraulic control valve arrangement (10) for controlling the movement of a hydraulic motor. The control valve arrangement (10) comprises a main control valve (11), which can be actuated by the alternating application and r... | 03/21/2000 |
| 5896890 | Pilot-operated servo-valve A pilot controlled servo-valve has four main flow connections, an axially sliding main control piston with four control edges and a front restoring spring that defines a spring-centered middle position of the main control piston. A control sleeve has ring... | 04/27/1999 |
| 5848612 | Servovalve employing a rotatable feedback linkage The invention is a mechanical-type position-sensing and feedback system employed between a main stage spool valve and a pilot stage spool valve of an electro-hydraulic servovalve. The feedback mechanism makes use of a rotatable feedback link that directly... | 12/15/1998 |
| 5832808 | Directional control valve unit A directional control valve unit includes a first actuator port connected to a raising side chamber of a working machine cylinder. In addition, a second actuator port is connected to a lowering side chamber of the working machine cylinder. A regeneration ... | 11/10/1998 |
| 5806565 | Hydraulic valves A hydraulic valve includes a spool movable within a body to regulate flow across the valve. Movement of the spool is controlled by an electromagnetic actuator that operates either directly or through a pilot stage upon the spool. When operating through a ... | 09/15/1998 |
| 5607290 | Air driven diaphragm pump A pump having a center section including an actuator housing and an air valve is arranged with air chambers to either side of the actuator housing. Diaphragms are associated with the air chambers to create enclosed cavities for alternately pressurizing an... | 03/04/1997 |
| 5573036 | Electro-hydraulic servovalve having mechanical feedback The invention is a multi-stage electro-hydraulic servovalve having a mechanical feedback between the valve's main and pilot stages. The feedback mechanism makes use of an interconnected set of linkages that transform a linear motion of the main stage slid... | 11/12/1996 |
| 5558126 | Double solenoid type electromagnetic valve A safe, double solenoid type electromagnetic valve which can be used as a single solenoid type electromagnetic valve and in which a main valve member does not change from one change-over position to another even when electric power is supplied to two pilo... | 09/24/1996 |
| 5553827 | Low current electro-hydraulic metering module A fluid flow control device of the type having a spool valve mechanically biased toward a neutral position, a movable fluidic control such as a jet pipe for selectively moving the spool valve from its neutral position, a torque motor movable from a neutra... | 09/10/1996 |
| 5545099 | Shift control valve of a hydraulic control system for automatic transmission A hydraulic control system for an automatic transmission, the system including: a fluid pump; a proportional control valve for reducing a hydraulic pressure in accordance with a vehicle speed; a valve body including a line pressure inlet port for receivin... | 08/13/1996 |
| 5538042 | Air driven device An air driven diaphragm pump having two diaphragms joined by a common control shaft to reciprocate in opposed chambers for pumping material through check valve ported cavities. An actuator valve is associated with the central housing of the pump and inclu... | 07/23/1996 |
| 5520217 | Directional valve A solenoid operated directional valve including a main section having a reciprocally mounted main fluid controlling valving member moveable between three positions in a housing. The housing defines at least two working ports and the main valving member co... | 05/28/1996 |
| 5445188 | Pilot operated servo valve A pilot-operated servo valve design for efficient mounting in a control block has at least three main-stream ports. An opening into a control sleeve for a first main-stream port is disposed opposite an end surface of a main control piston. The main contro... | 08/29/1995 |
| 5377719 | Pneumatic valve, particularly for control of compressed-air-operated membrane pumps A pneumatic valve, designed to control/pressurize a membrane pump, compresses a valve body (1) having gates (8-12) for compressed-air-flow/operation/pressurization of said pump. The valve body is closed by ends (2), between which a plunger (5) is to move ... | 01/03/1995 |
| 5353685 | Redundant fluidic multiplexer The reliability of a fluid multiplexed actuation system is increased by arranging a pair of fluidic multiplexers in a parallel fluid flow path between a selector valve and several fluid actuators. Position sensors associated with the fluidic multiplexers ... | 10/11/1994 |
| 5303727 | Fluidic deflector jet servovalve A deflector jet servovalve including a fluidic amplifier constructed utilizing a plurality of laminae stacked one upon the other and bonded together to form an integral laminated structure. The fluidic amplifier includes a fixed ejector and a pair of rece... | 04/19/1994 |
| 5279121 | Flow control valve with pilot operation and pressure compensation A pilot-actuated, pressure-compensated flow and directional control valve assembly (11) is provided in which a main valve spool (95) is positioned in response to a pressure differential between a pilot chamber (119) and a reaction chamber (117). Flow of f... | 01/18/1994 |
| 5156189 | High flow control valve A control valve including a second stage spool for controlling flow of fluid from a source thereof to a load. The valve includes one additional pressure slot and one additional return slot on each side thereof and separated by a land on the spool from the... | 10/20/1992 |
