Valves Biased By Fluid "springs" Patents (Class 137/906)
  • Patent number: 8905065
    Abstract: Exemplary embodiments of a gas biased pressure regulator comprise a capsule subassembly and a regulator body. The regulator body is adapted to connect to a source of pressurized gas. The capsule subassembly is removably received within the regulator body and includes a capsule body and a piston. The piston is axially slidable between fluid release and fluid seal configurations. When the piston is in its fluid release configuration, an output chamber is placed in fluid communication with the source. When the piston is in its fluid seal configuration, the output chamber is sealed from fluid communication with the source. A pressurizable bias chamber within the capsule body contains a bias pressure urging the piston toward its fluid release configuration. Pressure from the source urges the piston toward its fluid seal configuration. The piston may also have a fluid charge configuration for facilitating the pressurization of the bias chamber.
    Type: Grant
    Filed: July 11, 2012
    Date of Patent: December 9, 2014
    Inventors: Shmuel Dovid Newman, Jeffrey O. Brown
  • Patent number: 8616228
    Abstract: A multi-stage pressure regulator system. The system of the present invention provides for distribution of the Joules-Thomson (J-T) cooling effect between multiple stages. In the preferred embodiment of the present invention, the pressure is first reduced by a set ratio in one or more stages followed by an adjustable pressure output stage. The present invention thereby provides a system to control pressure reduction and thus prevent condensation (and associated distortion of a vapor composition sample) of a gas due to J-T cooling effect. The system of the present invention is particularly suitable for use placement (via, for example, a probe) within the source gas supply containment vessel, pipeline or the like, so that pressure reduction occurs at or near isothermal conditions, further lessening the likelihood of J-T condensation.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: December 31, 2013
    Assignee: A+ Manufacturing, LLC
    Inventor: Emma Lee Aymond Mayeaux
  • Patent number: 8307846
    Abstract: A pressure control valve is provided with a valve main body (10) having a valve chamber (15) with a valve seat portion (14), a refrigerant inflow port (11) and a refrigerant outflow port (12), and a pressure response element (30) having a diaphragm (20) defining an upper surface of a valve chamber (15) and driving a valve body (17) and a lid-like member (35) defining a sealed pressure chamber (25) together with the diaphragm (20) and having a concave portion (36), an inert gas having a thermal expansion coefficient not more than a predetermined value is enclosed within said sealed pressure chamber (25), and an internal volume of the sealed pressure chamber is set such that the valve body (17) comes to a full-open state when that the pressure of the valve chamber (18) becomes a predetermined pressure or more higher than the pressure at which said valve body starts opening.
    Type: Grant
    Filed: March 30, 2009
    Date of Patent: November 13, 2012
    Assignee: Fujikoki Corporation
    Inventors: Shu Yanagisawa, Ryo Matsuda, Daisuke Watari, Hiroshi Yokota
  • Patent number: 8220479
    Abstract: A multi-stage pressure regulator in which pressure is first reduced by a set ratio in one or more stages followed by an adjustable pressure output stage. The system of the present invention provides for distribution of the Joules-Thomson (JT) cooling effect between multiple stages. The present invention thereby provides a system to control pressure reduction and thus prevent condensation (and associated distortion of a vapor composition sample) of a gas due to J-T cooling effect.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: July 17, 2012
    Assignee: A+ Manufacturing LLC
    Inventor: Donald P. Mayeaux
  • Patent number: 8051812
    Abstract: Actuators, and corresponding methods and systems for controlling such actuators, provide independent valve control with a large initial or opening force.
    Type: Grant
    Filed: January 26, 2009
    Date of Patent: November 8, 2011
    Assignee: Scuderi Group, LLC
    Inventor: Zheng Lou
  • Patent number: 8011380
    Abstract: Disclosed is a cylindrical, single-component two-stage regulator for controlling a pressure and a flow rate of a gas. The regulator includes a housing for holding the two stages having an ingress adapted for connection to a source of gas at a high input pressure and an egress adapted for supplying gas at a lower output pressure than the high input pressure; a first stage for reducing the pressure of the gas from the high input pressure to a fixed intermediate pressure; and a second stage for reducing the pressure of the gas from the fixed intermediate pressure to the lower output pressure and regulating the flow rate of the gas out of the egress. One application of the present invention is for use in scuba (Self-Contained Under-water Breathing Apparatus) applications, where it replaces the traditional two-component user-adjustable regulator. The regulator may be made out of stainless steel, and is small enough to fit into a user's mouthpiece.
    Type: Grant
    Filed: January 4, 2010
    Date of Patent: September 6, 2011
    Assignee: Vision Tech International LLP
    Inventors: Paul J. Califano, Michael J. Califano
  • Patent number: 7938141
    Abstract: Disclosed is a cylindrical, single-component two-stage regulator for controlling a pressure and a flow rate of a gas. The regulator includes a housing for holding the two stages having an ingress adapted for connection to a source of gas at a high input pressure and an egress adapted for supplying gas at a lower output pressure than the high input pressure; a first stage for reducing the pressure of the gas from the high input pressure to a fixed intermediate pressure; and a second stage for reducing the pressure of the gas from the fixed intermediate pressure to the lower output pressure and regulating the flow rate of the gas out of the egress. One application of the present invention is for use in SCUBA (Self-Contained Underwater Breathing Apparatus) applications, where it replaces the traditional two-component user-adjustable regulator. The regulator may be made out of stainless steel, and is small enough to fit into a user's mouthpiece.
    Type: Grant
    Filed: September 18, 2010
    Date of Patent: May 10, 2011
    Assignee: Vision Tech International LLP
    Inventors: Paul J. Califano, Michael J. Califano
  • Patent number: 7905247
    Abstract: The invention relates to a re-configured valve design to accommodate a high volume of product in the delivery system and the dispensation of product upon the application of a predetermined vacuum condition on the downstream side of the valve.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: March 15, 2011
    Assignee: Praxair Technology, Inc.
    Inventor: Serge Campeau
  • Patent number: 7789657
    Abstract: A pressure regulator having a housing that defines a gas inlet, a gas outlet, and a reference pressure connector. A diaphragm is provided in the housing, where the diaphragm defines, at least in part, a reference pressure chamber. In some illustrative embodiments, the reference pressure connector fluidly references the reference pressure chamber to a first pressure via a first orifice, and to a second pressure via a second bleed orifice. A gas valve incorporating a pressure regulator is also disclosed.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: September 7, 2010
    Assignee: Honeywell International Inc.
    Inventors: James G. Buezis, Donald J. Kasprzyk
  • Patent number: 7748401
    Abstract: A gas pressure regulator comprises a main body having a first, gas inlet pipe and a second, gas outlet pipe, a calibrated gas passage through which gas flows from the first pipe to the second pipe, a shutter housed at least partially in the main body and mobile lengthwise along a first defined line to adjust the opening of the calibrated passage, a device for actuating the shutter and a regulator spring unit opposing the movement of the shutter.
    Type: Grant
    Filed: March 23, 2006
    Date of Patent: July 6, 2010
    Assignee: O.M.T. Officina Meccanica Tartarini S.r.l.
    Inventors: Stefano Zecchi, Andrea Monti
  • Patent number: 7458390
    Abstract: The present invention relates to a breath controlled air inlet valve for controlling a flow of air supplied to a wearer of a facemask, the valve permitting the flow of air when a wearer breathes in and restricting the flow of air when the wearer breathes out. The valve includes an inlet, an outlet, one or more pivotable shutters, and a shutter articulating mechanism for articulating the one or more shutters between an open state and a closed state. The shutter articulation mechanism actuates in response to the respiration of the wearer. The valve also enables a positive pressure to be maintained within the facemask by permitting an amount of air to flow around the one or more shutters when the one or more shutters are in the closed state.
    Type: Grant
    Filed: December 21, 2005
    Date of Patent: December 2, 2008
    Assignee: TVI Corporation
    Inventor: Otto Gossweiler
  • Patent number: 7387659
    Abstract: An automatic shut off circuit for controlling the flow of a gas through a gas separation system is disclosed. The gas separation system includes a gas separation module for separating nitrogen from air, and a non-electric automatic shut off circuit for controlling the delivery of air to the gas separation module. The non-electric automatic shut off circuit includes a pneumatically operated valve that enables or inhibits a flow of air to the gas separation module, and a pneumatic pressure switch operatively coupled to the pneumatically operated valve, wherein the pneumatic pressure switch monitors a pressure indicative of a demand for nitrogen, and the pneumatic pressure switch commands the pneumatically operated valve to enable or inhibit the flow of air based on the monitored pressure.
    Type: Grant
    Filed: February 1, 2005
    Date of Patent: June 17, 2008
    Assignee: Parker Hannifin Corporation
    Inventor: Martinus Franciscus Maria Roks
  • Patent number: 7370615
    Abstract: Improved actuators and valve control systems, and methods for controlling actuators and/or engine valves, are disclosed. In addition to the inherent capability of timing control, the ability to provide continuous valve lift or stroke control greatly improves engine achieve fuel economy, emission and performance. The power-off state of the actuator is at the minimum stroke, from which an easy start-up can be directly executed. The minimum stroke is also very beneficial to achieve efficient low load operation. Even with continuous lift variation, the present invention is able to keep the spring force neutral or zero point in the center of a stroke, thus maintaining an efficient scheme of energy conversion and recovery through the pendulum action. When in compression braking or other high engine cylinder air pressure working mode, the invention is able to supply necessary force to open the engine valve.
    Type: Grant
    Filed: January 5, 2006
    Date of Patent: May 13, 2008
    Assignee: LGD Technology, LLC
    Inventor: Zheng Lou
  • Patent number: 7357150
    Abstract: A safety shut-off device for sections of fluid circuits, which in case of damage or the like, have to shut off from each other on safety considerations. The safety shut-off device includes at least two valves connected to each other via a control chamber. A first pressure differential with the control chamber closes the valves and a second pressure differential, which is greater than the first, opens the valves.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: April 15, 2008
    Assignee: Visteon Global Technologies, Inc.
    Inventor: Juergen Berbuer
  • Patent number: 7290509
    Abstract: Improved actuators and valve control systems, and methods for controlling actuators and/or engine valves, are disclosed. In addition to the inherent capability of timing control, the ability to provide continuous valve lift or stroke control greatly improves engine achieve fuel economy, emission and performance. The power-off state of the actuator is at the minimum stroke, from which an easy start-up can be directly executed. The minimum stroke is also very beneficial to achieve efficient low load operation. Even with continuous lift variation, the present invention is able to keep the spring force neutral or zero point in the center of a stroke, thus maintaining an efficient scheme of energy conversion and recovery through the pendulum action. When in compression braking or other high engine cylinder air pressure working mode, the invention is able to supply necessary force to open the engine valve.
    Type: Grant
    Filed: August 1, 2005
    Date of Patent: November 6, 2007
    Inventor: Zheng Lou
  • Patent number: 7258133
    Abstract: A pressure reducing valve comprises a valve support member provided with a water passage, a valve seat fitting on the portion of the valve support member primary side relative to the secondary side end of the water passage, a cup-shaped valve body fitting on the secondary side end of the valve support member to slide and capable of abutting the valve seat at the open end, while enclosing the secondary side end of the water passage at the cylindrical portion, a seal member for sealing the sliding contact part between the valve support member and the valve body, and a resilient member disposed in the valve body to force the valve body away from the valve seat.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: August 21, 2007
    Assignee: ToTo Ltd.
    Inventors: Hideyuki Matsui, Osamu Tokunaga, Yoshika Hirai
  • Patent number: 7213549
    Abstract: Improved actuators and valve control systems, and methods for controlling actuators and/or engine valves, are disclosed. In addition to the inherent capability of timing control, the ability to provide continuous valve lift or stroke control greatly improves engine achieve fuel economy, emission and performance. The power-off state of the actuator is at the minimum stroke, from which an easy start-up can be directly executed. The minimum stroke is also very beneficial to achieve efficient low load operation. Even with continuous lift variation, the present invention is able to keep the spring force neutral or zero point in the center of a stroke, thus maintaining an efficient scheme of energy conversion and recovery through the pendulum action. When in compression braking or other high engine cylinder air pressure working mode, the invention is able to supply necessary force to open the engine valve.
    Type: Grant
    Filed: December 2, 2005
    Date of Patent: May 8, 2007
    Inventor: Zheng Lou
  • Patent number: 7156058
    Abstract: Actuators, and corresponding methods and systems for controlling such actuators, provide independent lift and timing control with minimum energy consumption, while supplying sufficient supplemental energy to overcome friction. In an exemplary embodiment, an actuation cylinder in a housing defines a longitudinal axis and having first and second ends in first and second directions. An actuation piston in the cylinder, with first and second surfaces, is moveable along the longitudinal axis. First and second actuation springs bias the actuation piston in the first and second directions, respectively. A first fluid space is defined by the first end of the actuation cylinder and the first surface of the actuation piston, and a second fluid space is defined by the second end of the actuation cylinder and the second surface of the actuation piston.
    Type: Grant
    Filed: February 2, 2006
    Date of Patent: January 2, 2007
    Inventor: Zheng Lou
  • Patent number: 7093605
    Abstract: A pipeline assembly for transporting a fluid such as oil, gas and water along a fluid path extending in the pipeline has a pressure control device incorporated therein. The pressure control device regulates the pressure of the fluid downstream the pressure control device to a predetermined pressure which is independent of, and less than, the pressure prevailing in the pipeline upstream of the pressure control device.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: August 22, 2006
    Assignee: Packaging Technology Holding S.A.
    Inventor: Jaap Herman van 't Hoff
  • Patent number: 6978799
    Abstract: A pressure relief valve has a housing fluidly connected to a pressurized system line carrying a system fluid. The housing carries a moveable piston and a valve member that both move between closed and open positions. The piston defines an upper chamber and a lower chamber within the housing. A pressurized fluid is supplied to the upper chamber to bias the piston toward the closed position. After the relief valve opens from excessive system pressure, the pressurized fluid is injected into the lower chamber to delay the return of the piston to the closed position. Initially, the fluid in the lower chamber flows through a check valve while the piston returns to the closed position. Then the fluid vent in the lower chamber vents from the lower chamber as the piston and valve member approach the closed position.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: December 27, 2005
    Assignee: S.P.M. Flow Control, Inc.
    Inventors: Vladimir Kugelev, Mark D. Matzner
  • Patent number: 6772791
    Abstract: A direct operated valve assembly is provided including a valve body having a pressurized inlet port in communication with a source of pressurized air, a cylinder port, a valve bore extending axially within the valve body, and a valve member supported within the valve bore and movable between predetermined positions within the valve bore to selectively direct pressurized air from said inlet port through the cylinder port. An actuator is also included that is mounted to the valve body for moving the valve member in a first direction and a biasing member disposed between the valve member and the valve body to provide a biasing force to the valve member in an opposite direction. Also, an air-assist passage is included for providing a source of pneumatic pressure that acts in combination with the biasing member to operatively move the valve member in a direction opposite to the movement induced by the actuator.
    Type: Grant
    Filed: May 17, 2002
    Date of Patent: August 10, 2004
    Assignee: MAC Valves, Inc.
    Inventor: Robert Neff
  • Patent number: 6675751
    Abstract: A hydraulic damper for an automotive engine electromechanical cylinder valve 20 is provided. The hydraulic damper includes an inner piston 130 which is slidably mounted within an outer piston 110. The outer piston is slidably mounted within an interior hydraulic filled cavity 82 of a damper body 80. Movement of the valve body 20 along extreme positions causes the inner piston 130 to move the outer piston 110 within the interior cavity 82 to effectuate hydraulic damping of the valve body 20.
    Type: Grant
    Filed: March 12, 2003
    Date of Patent: January 13, 2004
    Assignee: Ford Global Technologies, Inc.
    Inventors: Thomas William Megli, Philip Thomas Koneda, Stephen John Agdomy, Yan Wang
  • Patent number: 6601552
    Abstract: A hydraulically controllable globe valve having a stem piston to which pressure can be applied by a spring connected to a pressure source, with the stem piston being able to move from a first end position in the direction of a second end position. Pressure control means are provided which maintain a constant pressure of the hydraulic spring means on the stem piston while the latter moves from the first end position in the direction of the second end position by connecting the hydraulic spring means to a pressure source during a variable portion of the valve lift. The valve can be used, for example, as a gas exchange valve in a reciprocating engine.
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: August 5, 2003
    Assignee: DaimlerChrysler AG
    Inventors: Michael Kübel, Knud Lembke, Ulrich Letsche, Rudolf Thom
  • Patent number: 6589350
    Abstract: An apparatus for and a method of introducing a gas into a vacuum processing chamber are provided. In one aspect, a processing apparatus is provided that includes a vacuum processing chamber, a first source of gas coupled to the vacuum processing chamber, and a fluid actuated valve for regulating the flow of the gas from the first source of gas to the vacuum processing chamber. The fluid actuated valve is operable to open in response to a flow of an actuating fluid and has a minimum valve opening pressure. A valve is provided for enabling the actuating fluid to flow to the fluid actuated valve. A controller is provided for selectively modulating the flow of the actuating fluid to the fluid actuated valve whereby the pressure of the actuating fluid is increased incrementally from an initial pressure to at least the minimum valve opening pressure. The apparatus reduces the risk of troublesome gas bursts in vacuum processing chambers.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: July 8, 2003
    Assignee: Advanced Micro Devices, Inc.
    Inventor: Dennis C. Swartz
  • Patent number: 6502803
    Abstract: A valve for controlling fluids is embodied with a piezoelectric actuator (3) for actuating a valve member (2) that on one end has a valve head (7), forming a valve closing member, that cooperates with a seat (8) provided on the valve body (6) for opening and closing the valve (1). On a side of the piezoelectric actuator (3) remote from the valve member (2), a hydraulic chamber (21) is provided, which communicates, via at least one hydraulic line (23), with a bore (5) of the valve member (2) that is sealed from the piezoelectric actuator (3), and into which bore a piston (20) connected to the piezoelectric actuator (3) can plunge; the hydraulic chamber (21) is embodied as a hydraulic spring, which with its spring force on the piston (20) connected to the piezoelectric actuator (3) act as the prestressing element and the tolerance compensating element. The valve is intended in particular as a component of a fuel injection valve.
    Type: Grant
    Filed: May 25, 2001
    Date of Patent: January 7, 2003
    Assignee: Robert Bosch GmbH
    Inventor: Patrick Mattes
  • Patent number: 6494231
    Abstract: A valve device for low-viscosity to high-viscosity fluids, especially for fluid plastic components of plastic mixtures consisting of one or more components, with a valve housing having a fluid inflow and a dosaging valve, which has a dosing nozzle that can optionally be closed or opened by a closing element, as well as a pressure control device which acts on the fluid in the fluid inflow.
    Type: Grant
    Filed: March 28, 2001
    Date of Patent: December 17, 2002
    Assignee: EDF Polymer-Applikation Maschinenfabrik GmbH
    Inventors: Dietmar Fetz, Hannes Hausbichler
  • Patent number: 6491007
    Abstract: A hydraulically controllable globe valve having a stem piston to which pressure can be applied by a spring connected to a pressure source, with the stem piston being able to move from a first end position in the direction of a second end position. Pressure control means are provided which maintain a constant pressure of the hydraulic spring means on the stem piston while the latter moves from the first end position in the direction of the second end position by connecting the hydraulic spring means to a pressure source during a variable portion of the valve lift. The valve can be used, for example, as a gas exchange valve in a reciprocating engine.
    Type: Grant
    Filed: November 19, 1999
    Date of Patent: December 10, 2002
    Assignee: Daimler Chrysler AG
    Inventors: Michael Kübel, Knud Lembke, Ulrich Letsche, Rudolf Thom
  • Patent number: 6240956
    Abstract: A poultry drinker system includes a number of drinker lines each supplied from a common high pressure water supply through a water pressure regulator. Each regulator includes a reference spring establishing a default minimum water pressure. A centralized remote control system provides regulated low pressure air to the water pressure regulators to augment the reference spring force and remotely adjust the water pressure in the drinker lines. The remote control system periodically applies higher pressure air to the water pressure regulators to increase water pressure and flow rates and sequentially flush the drinker lines. The remote control system includes a source of high pressure air, an air pressure regulator for supplying lower pressure air and a stack of 3-way valves for applying low or high pressure air to each water pressure regulator.
    Type: Grant
    Filed: August 2, 1999
    Date of Patent: June 5, 2001
    Assignee: CTB, Inc.
    Inventor: Dwight N. Johnson
  • Patent number: 6161573
    Abstract: The present invention relates to an air pressure regulator, characterized in that a regulator made of a piston body connected with a return spring is disposed at the top of a main body, wherein the high-pressure gas flowing from the primary pressure chamber to the secondary pressure chamber can be controlled by means that the secondary pressure inside of the closed space created by the piston body and the top of the main body exerts a stable and balanced effect on the piston body which raises or lowers the plug assembly, and that a stable output and a high accuracy of the secondary pressure can be ensured by means that the resilience of the return spring and the gas pressure creates a coordination effect without being influenced by the pressure difference created by the change of the internal pressure inside steel cylinder after bottling, so that the using life thereof can be extended and its safety can also be enhanced.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: December 19, 2000
    Inventor: Chih-Sheng Sheng
  • Patent number: 6035889
    Abstract: A low cost diaphragm actuated absolute pressure regulator. The regulator comprises a housing having first and second sections that are secured together. The first section has a cavity and a diaphragm that seals the cavity and first section of the housing. An O-ring seal is disposed in a groove of the first section that seals against the diaphragm. The second section of the housing houses a movable and sealable vent plug that moves in response to movement of the diaphragm, and one or more vent openings for venting the interior of the second section to external pressure in response to motion of the diaphragm. The pressure regulator may be preferentially used in an upper atmospheric system that needs to maintain a specified pressure, but requires venting capabilities. Such systems include missiles that fly into the upper atmosphere.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: March 14, 2000
    Assignee: Raytheon Company
    Inventors: Roy A. Mangano, Werner J. Kroebig
  • Patent number: 6019121
    Abstract: A pressure reducing valve 30 comprises a body unit 32, a bonnet unit 36, and an operating unit 38 having a handle 126. The pressure reducing valve 30 further comprises a first diaphragm 84, a second diaphragm 86, a third diaphragm 100, and a fourth diaphragm 102 which are provided to extend in the body unit 32 while being separated from each other by predetermined spacing distances, and a nozzle 106 and a flapper 110 which are arranged in a third diaphragm chamber 116.
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: February 1, 2000
    Assignee: SMC Kabushiki Kaisha
    Inventor: Teruo Uehara
  • Patent number: 5937895
    Abstract: The present invention uses a regulator in the form of dispensing check valve and a flow restriction arrangement to provide a virtually fail safe system for preventing hazardous discharge of fluid from a pressurized cylinder or tank. A diaphragm controls the movement of a check valve element to prevent discharge of gas from a tank unless a predetermined vacuum condition exists downstream of the check valve. A capillary tube or other structure that provides capillary size opening minimizes any discharge of gas in the unlikely event of a failure of the regulator. This system is particularly useful in the delivery of arsine gas and provides multiple safeguards against accidental discharge.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: August 17, 1999
    Assignee: UOP LLC
    Inventors: David A. Le Febre, Thomas B. Martin, Jr.
  • Patent number: 5934318
    Abstract: The invention relates to a valve system for a space (1) which is under vacuum in relation to its surroundings (3), which valve system comprises a valve unit (7) which is intended to be arranged in association with a wall (2) which delimits the said space and has a wall opening (4) through the said wall, which valve unit comprises a valve (8) which is normally shut and closes the said wall opening but is arranged to be opened and allow air from the surroundings into the said space if the vacuum, i.e.
    Type: Grant
    Filed: December 23, 1996
    Date of Patent: August 10, 1999
    Assignee: Kvaerner Pulping aktiebolag
    Inventors: Ulf Jansson, Rolf Ekholm
  • Patent number: 5819778
    Abstract: 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 chambers. The spool unit comprises a hollow cylindrical outer spool slidably received in the spool receiving bore. The outer spool has a bottom portion exposed to the second pressure chamber. The bottom portion has an aperture formed therethrough. A cylindrical inner spool is incorporated with the outer spool. The inner spool includes a larger diameter portion slidably received in a major part of the outer spool and a smaller diameter portion slidably received in the aperture of the bottom portion of the outer spool. The inner spool is engaged with a control spring to be biased toward the first pressure chamber. A spring member is employed for biasing the outer and inner spools toward the second and first pressure chambers respectively.
    Type: Grant
    Filed: July 11, 1996
    Date of Patent: October 13, 1998
    Assignee: Unisia Jecs Corporation
    Inventors: Yukio Uchida, Norihiro Saita
  • Patent number: 5819777
    Abstract: 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 the hole, with one end of the spool valve. A drain passage is opened to the first pressure chamber and closable with the spool valve. A second pressure chamber is defined in the hole, with the other end of the spool valve. A restricting orifice is provided to be communicated with the first pressure chamber. An introduction passage is formed to be communicated through the restricting orifice with a discharge passage and opened to the first pressure chamber. The pressure in the discharge passage is introduced to the second pressure chamber. A first spring is disposed in the second pressure chamber to bias the spool valve in a direction to close the drain passage. A spring holding member is movably and coaxially disposed in the axially extending hole.
    Type: Grant
    Filed: July 2, 1996
    Date of Patent: October 13, 1998
    Assignee: Unisia Jecs Corporation
    Inventors: Yukio Uchida, Norihiro Saita
  • Patent number: 5809950
    Abstract: In a hydraulic valve control arrangement particularly of an internal combustion engine wherein the valve has a valve stem by which it is supported so as to be slideable between a closed and an open position and first there are provided first spring means biasing the valve in the closed position and second spring means providing an opening force which is transmitted via a valve tappet and an end of the valve tappet is received in a cylinder which is engaged by the second spring means so as to form a hydraulic force transmitting structure to which hydraulic fluid can be admitted for tensioning the second spring means. The valve tappet has a control piston received in a control chamber to which pressurized fluid is admitted which holds the control piston in either of its open or closed valve end positions and a pressure space is arranged adjacent the closed valve end positions of the control piston to which pressurized fluid can be admitted for initiating opening of the valve.
    Type: Grant
    Filed: May 30, 1997
    Date of Patent: September 22, 1998
    Assignee: Daimler-Benz AG
    Inventors: Ulrich Letsche, Ralf Gapp
  • Patent number: 5765515
    Abstract: In a hydraulic operating mechanism for a valve which comprises a valve stem with first spring means acting on the valve stem in the valve closing direction, and second spring means acting at least intermittently on the valve stem in a valve opening direction, the compressing force of the second spring means is controlled hydraulically during the operation of the valve control device. In order to keep the control forces required for operating the valve as low as possible over its entire operating range, the second spring means comprises a spring combination composed of at least two springs which have different spring forces providing for a maximum spring force of the second spring means at the start of the valve opening stroke.
    Type: Grant
    Filed: May 19, 1997
    Date of Patent: June 16, 1998
    Assignee: Daimler-Benz AG
    Inventor: Ulrich Letsche
  • Patent number: 5730182
    Abstract: A pressure compensation valve is constructed with a valve establishing and blocking a communication between an inlet port and an outlet port, a pressure receiving chamber, a piston driven by a load pressure within the pressure receiving chamber and shifting the valve in blocking direction, an intermediate pressure receiving chamber communicated with the inlet port via a first conduit and pushing the valve in blocking direction by the pressure therein, and a pressure variable relief valve for relieving a pressurized fluid in the intermediate pressure chamber to the outlet port via a second conduit.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: March 24, 1998
    Assignee: Komatsu Ltd.
    Inventors: Naoki Ishizaki, Toshiro Takano
  • Patent number: 5694975
    Abstract: A pressure regulator includes a housing having a chamber that receives a pressure responsive member 30. The pressure responsive member 30 includes an internal charge 90 that allows a movable portion 68 of the regulator to react in response to pressure differentials. A preferred embodiment of the regulator includes a dampening member defined by an o-ring 82 that exerts a drag on the pressure responsive member 30 to address oscillations associated with high flow rates. The dampening force can be varied according to the subject invention. Moreover, a normally planar poppet retaining member reduces manufacturing costs of the regulator and allows for a highly polished surface to address concerns with impurities. A biasing arrangement 120 is also incorporated into the regulator to assure that the poppet 68 seals against the valve seat 70 if the internal pressure charge of the regulator is lost.
    Type: Grant
    Filed: July 28, 1995
    Date of Patent: December 9, 1997
    Inventor: Paul G. Eidsmore
  • Patent number: 5595148
    Abstract: The invention relates to a freely activatable hydraulic valve control device for a stroke valve, which valve control device is arranged particularly in an internal-combustion engine. The stroke valve includes a valve stem and a first spring acting on the valve stem in the valve-closing direction as well as a second spring acting at least periodically on the valve stem in the valve-opening direction. The valve stem is connected at least to a control piston arranged in a working space and capable of being loaded on two sides with a working fluid. The pressure of the working fluid in the working space can be regulated via a pressure source together with a switching valve and a supply conduit.
    Type: Grant
    Filed: January 19, 1996
    Date of Patent: January 21, 1997
    Assignee: Mercedes-Benz AG
    Inventors: Ulrich Letsche, Andreas Rehberger, Frank Iberle
  • Patent number: 5549107
    Abstract: An improved second stage regulator employs a pneumatically-activated anti-set poppet and inhalation resistance adjustment control knob accessible externally of the regulator. The anti-set poppet utilizes a pressure-activated compression spring to seal the air inlet during exhalation. When the regulator is stored, the relaxed spring permits the seal to withdraw from the sharp edge orifice of the air inlet thereby avoiding seal wear which would otherwise diminish the performance of the regulator. The adjustment control knob permits the diver to modify the required cracking effort by changing the amount of spring compression when the regulator is pressurized.
    Type: Grant
    Filed: August 8, 1995
    Date of Patent: August 27, 1996
    Assignee: Under Sea Industries, Inc.
    Inventors: Dean R. Garraffe, Douglas J. Toth
  • Patent number: 5409040
    Abstract: A two-position, three-way pilot valve having a hollow spool valve element connected to a valve stem having first and second ends of equal diameter for pressure balancing the valve. A biasing piston engages one end of the valve stem and a pilot piston engages the other end of the valve stem. The pistons may include two piston rings of different diameter for holding the pistons in alignment. The ends of the spool valve element are structurally designed to maximize valve seating without overstressing.
    Type: Grant
    Filed: August 9, 1993
    Date of Patent: April 25, 1995
    Assignee: Koomey Companies International, Inc.
    Inventor: Jerry B. Tomlin
  • Patent number: 5323807
    Abstract: A check valve having a reduced or zero pressure drop and more particularly such a valve in combination with a spray nozzle. The check valve includes a sealed gas chamber which has within it a closed-cell foam element which insures that some gas remains in the chamber even if the primary seal fails. The new valve/nozzle combination allows valve operating pressure to be set very close to nozzle operation pressure which allows the nozzle to achieve full spray more quickly at start-up and a more immediate cessation of flow at shut off.
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: June 28, 1994
    Assignee: Delavan Inc.
    Inventors: James B. Gauld, William D. Fralick, Robert M. Patrick
  • Patent number: 5280804
    Abstract: This invention is intended to control the flow rate and pressure in a valve body by operating a throttling valve connected to the opening of the valve body by a remote pipe. The construction of the control valve is as follows: A spool type pressure compensated control valve 3 is installed on the upstream side of a flow passage of the valve body having an inlet 2 and an outlet 5, and a variable orifice 3' is formed on the pressure compensated control valve 3. On the downstream of the pressure compensated control valve 3 is installed a flow control throttling valve 4, which is urged by a spring 7 in the direction of closing the flow passage. The spring chamber 12' of the flow control throttling valve 4 is connected to the outlet 5 through a central passage 12 in the throttling valve 4. A chamber 20 at the other end of the flow control throttling valve 4 is connected to the inlet 2 via a variable throttle 16, and is also open to the outside of the valve body.
    Type: Grant
    Filed: August 26, 1992
    Date of Patent: January 25, 1994
    Assignee: Mitsubihi Jukogyo Kabushiki Kaisha
    Inventors: Makoto Takashima, Tsunenobu Matsumoto
  • Patent number: 5271428
    Abstract: An adjustable differential pressure valve that controls the pressure of a input fluid by maintaining a pressure differential between the fluid and another fluid, or fluids, of reference pressure, acts as a bypass valve and allows the pressure differential to be adjusted from the outside of the valve either mechanically or by remote hydraulic pressure. In an alternative embodiment of the invention, opposite ends of extensions of the piston are exposed to the outlet pressure of the valve by a passage communicating directly through the extensions and the piston.
    Type: Grant
    Filed: February 5, 1993
    Date of Patent: December 21, 1993
    Assignee: Dresser-Rand Company
    Inventors: Charles S. Dunn, Hung M. Do
  • Patent number: 5265645
    Abstract: A surge reliever relief valve is provided in which a flexible membrane is maintained in a peripherally sealed relationship across a rigid grid. The grid bounds the laterally adjacent intake and output regions of the valve. Intake pressure extends the membrane allowing flow between intake and output. Extension of the membrane is limited by a retainer. Extension may be elastic or inelastic.
    Type: Grant
    Filed: August 21, 1990
    Date of Patent: November 30, 1993
    Assignee: Peerless Manufacturing Company
    Inventor: Donald W. Goodwin
  • Patent number: 5253669
    Abstract: A method and apparatus for controlling the pressure to the bonnet of a pressure regulator, wherein two solenoid valves in combination with a buffer tank and a microprocessor to control the solenoid valves. When the pressure within the regulator bonnet exceeds a specified maximum value, one of the solenoid valves opens to allow the control pressure going to the regulator bonnet to be decreased. When the pressure in the regulator bonnet falls below a preset minimum value, the other solenoid valve opens to allow increased control pressure to enter the regulator and raise the regulator bonnet pressure to the level required.
    Type: Grant
    Filed: April 23, 1992
    Date of Patent: October 19, 1993
    Assignee: Span Instruments, Inc.
    Inventor: Tommy L. Gray
  • Patent number: 5253619
    Abstract: A hydraulic actuator includes a pneumatic piston, a hydraulic piston, and an engine valve on a common shaft. The pneumatic piston is urged between first and second stable positions primarily by a double acting pneumatic spring, with high pressure hydraulic fluid connected to a first hydraulic chamber being used to cock the hydraulic piston in a first stable position (engine valve closed). Hydraulic fluid isolated in a second hydraulic chamber is used to latch the hydraulic piston in a second stable position (engine valve open). Transfer of hydraulic fluid between first and second chambers is effected by a carrier for two check valves, which carrier in a first position disables the second check valve to permit fluid to flow from the second chamber to the first chamber, whereupon the first check valve closes (cocking). In a second position the carrier disables the first check valve to permit fluid to flow from the first chamber to the second chamber, whereupon the second check valve closes (latching).
    Type: Grant
    Filed: December 9, 1992
    Date of Patent: October 19, 1993
    Assignee: North American Philips Corporation
    Inventors: William E. Richeson, Frederick L. Erickson
  • Patent number: 5193575
    Abstract: An adjustable differential pressure valve that controls the pressure of a input fluid by maintaining a pressure differential between the fluid and another fluid, or fluids, of reference pressure, acts as a bypass valve and allows the pressure differential to be adjusted from the outside of the valve either mechanically or by remote hydraulic pressure.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: March 16, 1993
    Assignee: Dresser-Rand
    Inventor: Hung M. Do
  • Patent number: 5165493
    Abstract: A mud saver valve in which a cylindrical resilient sleeve is pressed against an inner tubular member by a pressurized gas to prevent flow from above the valve to below the valve at low pressures, and which is fully opened for free flow at higher pressures.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: November 24, 1992
    Inventor: Benton F. Baugh