Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 7270145 | unloading/venting valve having integrated therewith a high-pressure protection valve The invention relates to valves for air compressors, and more particularly, to an unloading/venting valve having integrated therewith a high-pressure protection valve where a pressure reducing valve has a discharge port in communication with the air system and a ven... | 09/18/2007 |
| 7204266 | Pilot-operated pressure shut-off valve A pilot-operated pressure shut-off valve having a main control piston which, when an upper system limit pressure in the hydraulic system is reached, connects an inlet, via which pressure medium can be fed to a hydraulic system, to an outlet by taking up a first swit... | 04/17/2007 |
| 7178545 | Modulating bypass control system and method A control system for a bypass duct includes a pneumatic damper control assembly, a sensor and a pneumatic switch. The damper control assembly includes a damper vane mountable in the bypass duct for movement between relative open and closed positions to regulate airf... | 02/20/2007 |
| 7080891 | Safety device for an automotive pneumatic system The invention relates to a safety device for an automotive pneumatic system, whereby a safety valve comprising a restoring element is provided. The invention also relates to a method which enables an automotive pneumatic system to operate in a safety mode. Component... | 07/25/2006 |
| 7025083 | Quick closing shut-off valve A quick closing shut-off valve includes an inlet, an outlet and a passage there between. A closing element blocks the passage when in the closed position. The closing element is interconnected to a piston via a pull rod. The piston is positioned within a working cha... | 04/11/2006 |
| 7017605 | Valve assembly A valve assembly (112) includes a first member (120) having a cavity (136). A poppet (142) is located in the cavity (136) in the first member (120). The poppet (142) is axially movable relative to the first member ( | 03/28/2006 |
| 6820641 | Internally piloted dome loaded regulator The internally piloted dome loaded pressure reducing regulator includes a regulator body with a main valve portion and a pilot valve portion. The inlet is fluidly connected to the main valve bore which in turn is connected to the pilot valve bore. Each of the pilot ... | 11/23/2004 |
| 6601602 | Pressure-control valve A pressure-control valve (1) comprises a first control piston (1), which is disposed between a first pressure chamber (6), which adjoins the first control piston (1) and is connected to at least one working line (A, B), and a second pressure chamber (7), ... | 08/05/2003 |
| 6176251 | Valve assembly in particular for a pressure washer A pressure washing machine has a valve assembly with an inlet opening and an outlet opening for a pressurized fluid, and a fluid interception element which is movable under the thrust of the fluid itself between a first operating position in which the flu... | 01/23/2001 |
| 6170508 | Fluid flow regulating valve and method A valve for regulating the rate of flow and/or the pressure of oil flowing to a transmission or another consumer in the power train of a motor vehicle has a piston which defines with the valve housing a chamber for one or more springs and for oil being ad... | 01/09/2001 |
| 6095177 | Precontrolled 3-way pressure control valve A precontrolled 3-way pressure control valve with a main valve having, in a valve housing, a valve bore with first, second and third control chambers connected with pressure connection, tank connection, and control connection, respectively, a control pist... | 08/01/2000 |
| 6041808 | Compressed air control device for a source of compressed air on motor vehicles A compressed air control device for a source of compressed air on motor vehicles, forming a unit of an electro-pneumatic unloader, an integrated electro-pneumatic multi-circuit control valve and an air-drier, comprising an inlet and an outlet provided in ... | 03/28/2000 |
| 5957148 | Valve system having a deadman controlled actuating member in a vented chamber A main valve receives fluid at an inlet and transmits the fluid to an outlet. The main valve has a rear face. A surge control servo valve responds to a load sense signal and moves between a closed position and an open position in which the fluid is transm... | 09/28/1999 |
| 5857479 | Precontrolled three-way pressure reduction valve A precontrolled three-way pressure reduction valve having essentially vibration-free operation is encased in a cartridge and has a hollow control piston wherein a working fluid space is formed as a T-shaped cavity within the control piston. In the cavity,... | 01/12/1999 |
| 5758683 | On/off circuit for a hydraulic system An on/off, protective circuit has a pressure line with an inlet for connection to a pressure source and an outlet for connection to the pressure port of a hydraulic system, such as a reciprocating conveyor. A relief valve is spring biased into a closed po... | 06/02/1998 |
| 5735305 | Unloading system for hydraulic circuit An unloading system including an unload valve draining a part of supplied pressurized fluid to a tank and a switching valve for draining a pressurized fluid for biasing the unload valve in a direction for reducing a flow rate of the fluid supplied to the ... | 04/07/1998 |
| 5375619 | Protective circuit for pressure and return A protective circuit (40) for pressure and return connections of a hydraulic system. The protective circuit includes a four-way, two-position on/off valve (65) having a first (66), second (68), and third (70) port. In its "off" position, valve (65) connec... | 12/27/1994 |
| 5323799 | Fully mechanical pressure relief system A mechanical pressure relief system for a pressurized operating system which is suitable for high purity applications. The pressure relief system utilizes a mechanical logic switch, operable at a set point pressure, in conjunction with a pressurized actua... | 06/28/1994 |
| 5209255 | Accumulator loading valve An accumulator loading valve is provided which is adapted for elevated pressures, which requires but little space, and which has a pump connection (1), a reservoir connection (20), a priority valve (7) between the consumer connection and the accumulator c... | 05/11/1993 |
| 5172624 | Hydraulic device A hydraulic device is furnished for an automatic connection of the pressure means source, either preferably to the primary user or to the secondary user depending on the pressure in the circuit of the primary user. A switching valve can be actuated by way... | 12/22/1992 |
| 4997459 | Gas pressure relief system The gas distribution system has a main gas line in gas flow connection with several components including a gas pressure safety structure. A pressure regulator is located on a front or forward portion of the main gas line and reduces the gas pressure at a ... | 03/05/1991 |
| 4700748 | Pressure-referenced programmed flow control in a hydraulic valve The point at which pump out pressure exceeds load is sensed to provide a point for scheduling flow to an actuator in a hydraulic system. Flow is controlled by a stepper motor (28) that moves a flow control valve (27). The steps needed to achieve fixed flo... | 10/20/1987 |
| 4611621 | Pressure control valve and oil supply device using said valve A pressure control valve for maintaining a control pressure constant even if the flow rate of pressurized oil varies, and an oil supply apparatus adapted for a turbo machine using this pressure control valve. The pressure control valve drives a throttle v... | 09/16/1986 |
| 4592378 | Low pressure pool cleaner system An improved water jet pool cleaner system includes a pool cleaner with a buoyant housing powered about the pool by forward and reverse driving nozzles so dirt and other debris is gathered at the low point on the bottom of the pool by the action of dependi... | 06/03/1986 |
| 4591317 | Dual pump controls Controls for a dual element pump having first and second pumps with separate outputs wherein a modulating valve is positionable to control the amount of fuel delivered by a first pump to a fuel control and additionally to selectively control the utilizati... | 05/27/1986 |
| 4559965 | Multiple compensating unloading valve circuit A multiple compensating unloading valve circuit including multiple fixed displacement pumps and corresponding compensator unloading valves which are phased so that one pump supplies the fluid demand for the circuit until the demand exceeds that pump's cap... | 12/24/1985 |
| 4344451 | Pressure responsive distributing valve device The disclosed valve device includes first, second and third user ports. A pressure accumulator connects with the first user port. With the accumulator fully charged, a pressure port connected to a pump communicates with the second user port. With the accu... | 08/17/1982 |
| 4240255 | Integrated control device for a fluid circuit and applications thereof The device comprises in a body a pressure limiting stage, a second stage constituting a fluid check and retarding valve and piloting means between these two stages. The second stage comprises regulating means which are easily accessible from outside the b... | 12/23/1980 |
| 4163412 | Fluid cylinder control with precision stop action A control system for a fluid pressure-actuated cylinder or the like includes a pump supplying fluid from a reservoir to a control valve which may be selectively operated to cause cylinder extension or retraction and to immobilize the cylinder at a selecte... | 08/07/1979 |
| 4114637 | Variable differential pressure unloading valve apparatus Variable differential pressure control apparatus is used in a hydraulic system including a pump, an accumulator for receiving hydraulic fluid under pressure from the pump and for discharging hydraulic fluid to a work device, and an unloading valve in the ... | 09/19/1978 |
| 4099378 | Blocking valve for power steering for lift trucks An improved valving arrangement and actuator is provided for a power steering unit for a lift truck, and in particular for a battery powered lift truck. To the conventional implement valve is added an accumulator charging means which includes an additiona... | 07/11/1978 |
| 4095611 | Modulating flow control valve assembly The preferred embodiment of the invention disclosed herein includes a main check valve movable between a fully closed and fully open position in response to the flow requirements from a pressure source to a demand system and including an intermediate posi... | 06/20/1978 |
| 4084604 | Pressure responsive distributing valve A pressure responsive valve for distributing the fluid under pressure delivered by a fluid pressure source to two user components, one of which is connected to an accumulator. The device includes a control valve which is disposed in a line connecting the ... | 04/18/1978 |
| 4062374 | Hydraulic valves and hydraulic systems A combined compensator and off-loading valve comprising a system pressure gallery connected to a tank or low pressure gallery by a plunger valve, the plunger having a greater area than the valve seating, this differential area being exposed in operation t... | 12/13/1977 |
| 4020862 | Apparatus for controlling the volume and pressure of a pressure medium in a die-casting machine Apparatus for controlling the volume and pressure of a pressure medium in a die-casting machine has an inlet, to which high pressure, high volume flow fluid can be supplied, and an outlet to a point of use. For controlling volume flow, a plurality of diap... | 05/03/1977 |
| 4016898 | Means for suppressing cavitation in a high pressure relief valve The suppression of bubble formation and cavitation in the fluid passing through a high pressure relief valve is achieved by a back pressure valve in the relief valve discharge line. The back pressure valve has differential area pistons which maintain a ba... | 04/12/1977 |
| 4011887 | Fluid power control apparatus A fluid power control apparatus which comprises the unique combination of a control housing including a cylindrically shaped core member mounted in a sealed relationship within a receptacle member. A plurality of grooves or recesses generated in the outer... | 03/15/1977 |
| 4007756 | Air control apparatus for an engine exhaust gas purification system An exhaust gas purifying apparatus for an engine, such as a thermal reactor or catalytic converter, is supplied secondary air through a secondary air control valve which is controlled by a combination of a first and a second differential pressure respondi... | 02/15/1977 |
| 3965920 | Installations for monitoring oil content An apparatus for detecting the presence in a liquid of material that emits fluorescent radiation when stimulated by ultraviolet radiation. A chamber having an inlet and an outlet for passing a stream of liquid therethrough. A source of ultraviolet radiati... | 06/29/1976 |
