With Counter-balancing Pressure Feedback To The Modulating Device Patents (Class 137/85)
  • Patent number: 9625184
    Abstract: A heating, ventilation, and/or air conditioning (HVAC) system has a first variable refrigerant flow outdoor unit, a first ducted variable speed indoor unit configured to selectively exchange refrigerant with the first variable refrigerant flow outdoor unit, and a second indoor unit configured to selectively exchange refrigerant with the first variable refrigerant flow outdoor unit.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: April 18, 2017
    Assignee: Trane International Inc.
    Inventors: Yi Hu, Mark Eldo Groskreutz, Nicholas Shin
  • Patent number: 9568119
    Abstract: A method of calibrating an electrohydraulic valve is disclosed. The method includes actuating an on-off valve to an open position. A speed of a fixed displacement pump is regulated to establish a desired flow rate at an outlet of the pump. The pump is in fluid communication within a closed loop circuit with the on-off valve and the electrohydraulic valve. A target pressure in the closed loop circuit is determined as a function of the desired flow rate. The method further includes increasing a current to the electrohydraulic valve and monitoring the target pressure in the closed loop circuit. A start of a fluid flow through the electrohydraulic valve is determined based on a drop in the target pressure within the closed loop circuit.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: February 14, 2017
    Assignee: Caterpillar Global Mining America LLC
    Inventors: Brett J. Janson, Matthew J. Beschorner
  • Patent number: 9550404
    Abstract: Various embodiments related to hydraulic actuators and active suspension systems as well as their methods of use are described.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: January 24, 2017
    Assignee: Levant Power Corporation
    Inventors: Marco Giovanardi, Clive Tucker, Ross J. Wendell, Zackary Martin Anderson, Colin Patrick O'Shea, Vladimir Gorelik, Tyson David Sawyer, Jonathan R. Leehey, Johannes Schneider, Robert Driscoll, Patrick W. Neil, Shakeel Avadhany
  • Patent number: 9404515
    Abstract: A valve positioner that can maintain operation of the control valve despite failures in one or more components. The valve positioner may reduce downtime by allowing in-situ repair to occur on the valve positioner. The valve positioner may incorporate a by-pass component, which can utilize control input signals (e.g., a 4-20 mA signal) to energize one or more components (e.g., a current-to-pressure converter) to cause the control valve to modulate fluid flow without the digital microprocessor and/or related components.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: August 2, 2016
    Assignee: Dresser, Inc.
    Inventor: Sandro Esposito
  • Patent number: 9388911
    Abstract: A valve apparatus includes valve box, valve shaft, first flexible film, and second flexible film. The valve box includes inlet and outlet, and forms a space therein for housing the fluids. The valve shaft is inserted into through-hole formed in the wall of the valve box, and moves in the longitudinal direction of the through-hole to move valve body in order to block the flow of the fluids from inlet to outlet. The first flexible film includes a through-hole into which the valve shaft is inserted. The outer peripheral end of the first flexible film is fixed to the peripheral edge of the through-hole, and the peripheral edge of the through-hole of the first flexible film is fixed to the outer periphery of the valve shaft to close the gap between the through-hole and the valve shaft. The second flexible film forms a part of the wall of valve box.
    Type: Grant
    Filed: September 3, 2012
    Date of Patent: July 12, 2016
    Assignee: NEC Corporation
    Inventor: Daisuke Ike
  • Patent number: 9282664
    Abstract: A switching installation includes a gas tight housing with at least one wall part. An input conductor disposed in the housing is configured to carry an input voltage. An insulation is arranged around the input conductor so as to insulate the input conductor from the housing. A short-circuit device is changeable from a first condition, in which the insulation is insulating the input conductor from the housing, to a second condition, in which an electrical short circuit connection is created through the insulation between the input conductor and an auxiliary connection. An actuator is coupled to the at least one wall part of the gas tight housing and is configured to actuate the short-circuit device as a result of movement of the wall part caused by a pressure increase in the housing. A threshold device is configured to provide a preset threshold in the actuator.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: March 8, 2016
    Assignee: EATON INDUSTRIES (NETHERLANDS) B.V.
    Inventors: Johan Dinant Heilersig, Paolo D'Amico, Peter Hornok, Marcel Van Dijk
  • Patent number: 9265925
    Abstract: A valve apparatus for a medical injection system includes a pinching member and at least one spring-loaded anvil. A tubing line of the injection system may be positioned between the pinching member and the anvil, such that when the pinching member is moved into a pinching position adjacent to the anvil, for example, by rotation of a shaft to which the member is coupled, the pinching member compresses the tubing line against the spring-loaded anvil. The pinching member is preferably rotatable about an auxiliary axis, which is eccentric, or offset from a central axis of the shaft. A spring member of the spring-loaded anvil is preferably pre-loaded. In certain applications, the pinching member, when moved into the pinching position, applies a pinching force of greater than approximately 45 pounds, for example, to prevent flow through the tubing line at an injection pressure of up to approximately 1200 psi.
    Type: Grant
    Filed: October 16, 2012
    Date of Patent: February 23, 2016
    Assignee: ACIST Medical Systems, Inc.
    Inventors: John Russell, Troy Marshall Coolidge
  • Patent number: 9261867
    Abstract: A parameter acquiring device for acquiring parameters for a control valve has a controlling valve operating unit, a valve opening signal acquiring unit and a parameter calculator. The controlling valve operating unit operates a controlling valve in an opening direction and in a closing direction by changing, in a specific sequence, a control signal that controls an opening of a regulator valve. The valve opening signal acquiring unit acquires a signal indicating an actual opening of the regulator valve. The parameter calculator acquires data pairs of control signals and valve opening signals. The parameter calculator calculates a parameter of the control valve based on the data pairs that have been acquired.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: February 16, 2016
    Assignee: AZBIL CORPORATION
    Inventors: Toru Kashima, Satoshi Yuzawa, Takashi Nomiyama, Keisuke Narumi
  • Patent number: 9182048
    Abstract: A switchable pressure limiting valve with an electromagnet (1) and with a device (2) for opening and closing a passage for the fluid stream. The opening of the valve is determined by the balance of forces at the tappet (3) upon which the pressure force of the fluid at the P-connection (4), the pressure force of the fluid at the T-connection (13) and the forces of two springs (5) and (6) act. The force of the spring (6) is varied by means of the position of the armature of the electromagnet. When the pressure force at the P-connection (4) outweighs the sum of the other forces, the valve opens. The above-mentioned device for opening and closing is composed of a diaphragm (7) and of a sealing seat (12), and this diaphragm is tension-mounted sealingly between the magnetic pole (10) and the housing (21).
    Type: Grant
    Filed: March 31, 2012
    Date of Patent: November 10, 2015
    Assignee: Thomas Magnete GmbH
    Inventors: Thomas Rolland, Mike Heck
  • Patent number: 9140274
    Abstract: A directional valve for controlling an actuator by means of pressurized medium, including: a spool fitted to move axially inside the directional valve; a first position of the spool, in which the spool tends to be set; and a second position of the spool, to which the spool can be moved by a pilot control force. Additionally, the directional valve includes a metering orifice placed in the pressure port or in the first work port or in the second work port or in the tank port, and across which a pressure difference is effective. The spool further includes a second position, to which the spool can be moved by a pilot control force. When the spool is in at least the second position, the directional valve is fitted to generate a compensating force proportional to said pressure difference, to move the spool to compensate for the flow.
    Type: Grant
    Filed: January 12, 2012
    Date of Patent: September 22, 2015
    Assignee: PARKER HANNIFIN MANUFACTURING FINLAND OY
    Inventor: Tommi Liukkunen
  • Patent number: 9032986
    Abstract: A volume booster for a fluid flow control device comprises a supply path for supplying a fluid boost to facilitate actuation of an actuator in a first direction, and an exhaust path for enabling controlled exhaust to facilitate actuation of the actuator in a second direction. The supply path defines a supply resistance that is set by the geometry of a supply trim component. The exhaust path includes an exhaust resistance that is set by the geometry of an exhaust trim component. The supply and exhaust trim components are independently removable and replaceable with replacement components to customize the exhaust and supply resistances, and therefore, the exhaust and supply capacities for specific applications.
    Type: Grant
    Filed: August 12, 2011
    Date of Patent: May 19, 2015
    Assignee: FISHER CONTROLS INTERNATIONAL LLC
    Inventors: Michel K. Lovell, Kenneth W. Junk, Ryan J. Jwanouskos
  • Patent number: 8960217
    Abstract: A spool is provided with a first discharge air duct connecting the first opening to the first discharge air chamber, and a second discharge air duct connecting the second opening to the second discharge air chamber, where the first discharge air duct and the second discharge air duct are divided by a non-duct part. A first output air pressure chamber is adjacent to a first discharge air chamber with a first diaphragm interposed therebetween, the first discharge air chamber is adjacent to a bias chamber with a second diaphragm interposed therebetween, the bias chamber is adjacent to an input air pressure chamber with a third diaphragm interposed therebetween, the input air pressure chamber is adjacent to a second discharge air chamber with a fourth diaphragm interposed therebetween, and the second discharge air chamber is adjacent to a second output air pressure chamber with a fifth diaphragm interposed therebetween.
    Type: Grant
    Filed: March 27, 2012
    Date of Patent: February 24, 2015
    Assignee: Azbil Corporation
    Inventor: Yohsuke Inagaki
  • Publication number: 20140363757
    Abstract: A pressure adjustment unit for an adjustment of fluid pressures in at least one first fluid chamber and in at least one second fluid chamber, which at least in the main is separate from the first fluid chamber, within at least one pressure interval, in particular for an at least substantial avoidance of a relative overpressure in one of the fluid chambers, having at least one first pressure expansion element which is provided for modifying a spatial volume of the at least one first fluid chamber, having at least one second pressure expansion element which is provided for modifying a spatial volume of the at least one second fluid chamber, and having at least one pressure coupling unit which is provided for effecting a negative feedback of spatial volume changes of the at least one first fluid chamber and of the at least one second fluid chamber.
    Type: Application
    Filed: May 29, 2014
    Publication date: December 11, 2014
    Applicant: Astrium GmbH
    Inventors: Walter JEHLE, Joachim LUCAS
  • Publication number: 20140251447
    Abstract: A hydraulic servovalve having two stages and feedback members in which the movable power distribution member has clamp means for clamping the feedback member, while allowing a clamped portion of the feedback member at least one freedom of movement relative to the movable distribution member.
    Type: Application
    Filed: October 8, 2012
    Publication date: September 11, 2014
    Applicant: ZODIAC HYDRAULICS
    Inventor: Guylain Ozzello
  • Patent number: 8622072
    Abstract: Apparatus to control a fluid flow are disclosed. An example fluid flow control apparatus described herein includes a signal stage comprising a signal stage relay having a supply plug being operatively connected to a valve seat at a first end and an exhaust seat at a second end and a seal operatively coupled to the supply plug such that the seal provides a feedback area to apply a fluid pressure feedback force to the exhaust seat.
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: January 7, 2014
    Assignee: Fisher Controls International, LLC
    Inventor: Michel Ken Lovell
  • Patent number: 8459289
    Abstract: An operating mode of an electro-pneumatic converting unit is stored in advance in an electro-pneumatic converting unit operating mode storing unit. A blockage location identifying function is provided in a calculating unit. The operating unit monitors the magnitude of shift and the direction of shift of the control output, relative to the nozzle back pressure, through the blockage location identifying function, and identifies whether a blockage has occurred in the fixed orifice or the nozzle/flapper mechanism based on the magnitude of shift and direction of shift of the control output, relative to the nozzle back pressure, and based on the operating mode of the electro-pneumatic converting unit, stored in the electro-pneumatic converting unit operating mode storing unit.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: June 11, 2013
    Assignee: Azbil Corporation
    Inventor: Yohsuke Inagaki
  • Publication number: 20120241010
    Abstract: A digitally controlled current to pressure converter (CPC) is provided. A digital CPC utilizes a digital controller and an onboard pressure transducer to accurately control the output pressure based upon an input analog control signal. The digital controller includes an anti-silting algorithm that provides an impulse movement of the three-way rotary valve of the CPC to loosen and flush away silt contamination from the valve. A redundant seal stack including an intermediate passage to the hydraulic drain ensures a low pressure drop across the outboard seal minimizing the potential for leakage and improving reliability of the CPC. The digital controller also includes redundancy and fault management algorithms that enable the use of multiple inputs and feedback signals for control of the CPC. Master/slave operation and transitioning is also provided by the digital controller.
    Type: Application
    Filed: June 6, 2012
    Publication date: September 27, 2012
    Applicant: Woodward, Inc.
    Inventor: Kevin E. Greeb
  • Patent number: 8215329
    Abstract: A digitally controlled current to pressure converter (CPC) is provided. A digital CPC utilizes a digital controller and an onboard pressure transducer to accurately control the output pressure based upon an input analog control signal. The digital controller includes an anti-silting algorithm that provides an impulse movement of the three-way rotary valve of the CPC to loosen and flush away silt contamination from the valve. A redundant seal stack including an intermediate passage to the hydraulic drain ensures a low pressure drop across the outboard seal minimizing the potential for leakage and improving reliability of the CPC. The digital controller also includes redundancy and fault management algorithms that enable the use of multiple inputs and feedback signals for control of the CPC. Master/slave operation and transitioning is also provided by the digital controller.
    Type: Grant
    Filed: February 1, 2008
    Date of Patent: July 10, 2012
    Assignee: Woodward, Inc.
    Inventor: Kevin E. Greeb
  • Publication number: 20110240138
    Abstract: An operating mode of an electro-pneumatic converting unit is stored in advance in an electro-pneumatic converting unit operating mode storing unit. A blockage location identifying function is provided in a calculating unit. The operating unit monitors the magnitude of shift and the direction of shift of the control output, relative to the nozzle back pressure, through the blockage location identifying function, and identifies whether a blockage has occurred in the fixed orifice or the nozzle/flapper mechanism based on the magnitude of shift and direction of shift of the control output, relative to the nozzle back pressure, and based on the operating mode of the electro-pneumatic converting unit, stored in the electro-pneumatic converting unit operating mode storing unit.
    Type: Application
    Filed: March 30, 2011
    Publication date: October 6, 2011
    Applicant: YAMATAKE CORPORATION
    Inventor: Yohsuke Inagaki
  • Patent number: 7766030
    Abstract: A high pressure transducer is disclosed. The transducer includes a supply inlet configured to provide a gas supply to the high pressure transducer at a supply pressure and a pressure divider section coupled to the supply inlet. The pressure divider section is configured to reduce the supply pressure to a reduced pressure as a function of a first predetermined ratio. The transducer also includes a low pressure control section coupled to the pressure divider section and configured to receiving the gas supply at the reduced pressure and an amplifying section coupled to the low pressure control section. The low pressure control section varies the reduced pressure to produce a variable control pressure to actuate the amplifying section in response thereto. The amplifying section is also configured to multiply the variable control pressure as a function of a second ratio to obtain an output pressure.
    Type: Grant
    Filed: July 19, 2007
    Date of Patent: August 3, 2010
    Assignee: Fairchild Industrial Products Company
    Inventor: Andy R. Askew
  • Publication number: 20100139781
    Abstract: Apparatus to control a fluid flow are disclosed. An example fluid flow control apparatus described herein includes a signal stage comprising a signal stage relay having a supply plug being operatively connected to a valve seat at a first end and an exhaust seat at a second end and a seal operatively coupled to the supply plug such that the seal provides a feedback area to apply a fluid pressure feedback force to the exhaust seat.
    Type: Application
    Filed: December 2, 2009
    Publication date: June 10, 2010
    Inventor: Michel Ken Lovell
  • Publication number: 20090194169
    Abstract: A digitally controlled current to pressure converter (CPC) is provided. A digital CPC utilizes a digital controller and an onboard pressure transducer to accurately control the output pressure based upon an input analog control signal. The digital controller includes an anti-silting algorithm that provides an impulse movement of the three-way rotary valve of the CPC to loosen and flush away silt contamination from the valve. A redundant seal stack including an intermediate passage to the hydraulic drain ensures a low pressure drop across the outboard seal minimizing the potential for leakage and improving reliability of the CPC. The digital controller also includes redundancy and fault management algorithms that enable the use of multiple inputs and feedback signals for control of the CPC. Master/slave operation and transitioning is also provided by the digital controller.
    Type: Application
    Filed: February 1, 2008
    Publication date: August 6, 2009
    Applicant: Woodlward Governor Company
    Inventor: Kevin E. Greeb
  • Publication number: 20090159135
    Abstract: A pneumatic amplifier is provided comprising a supply air valve with a supply inlet connected to a pneumatic supply. A signal input for receiving a pneumatic input signal, a signal output for transmitting an amplified pneumatic output signal, a valve member for continuously opening or cutting off a pneumatic connection between the pneumatic supply and the signal output, and a diaphragm coupled with the valve member exposed at one side to the pneumatic input signal and having an opposite side. An exhaust air valve is provided with a bleed outlet, and a valve member for opening or cutting off a pneumatic connection between the signal output of the supply air valve and the bleed outlet, the valve members of the supply air valve and the exhaust air valve being structurally separated. The opposite side of the supply air valve diaphragm is exposed to the amplified pneumatic output signal.
    Type: Application
    Filed: December 22, 2008
    Publication date: June 25, 2009
    Inventor: Stefan Kolbenschlag
  • Publication number: 20080149186
    Abstract: A combination pneumatic and electro-pneumatic gas valve positioning system comprising a pneumatic positioner and an electro-pneumatic positioner in parallel. The apparatus also includes at least one solenoid to control gas flow between the electro-pneumatic positioner and the pneumatic positioner.
    Type: Application
    Filed: February 7, 2007
    Publication date: June 26, 2008
    Inventor: Ricky L. Martin
  • Publication number: 20080078449
    Abstract: A pneumatic controller for controlling a process advantageously reduces fluid consumption by providing a proportional adjustment to a feedback signal. The pneumatic controller comprises a pneumatic control stage such as a relay, a process pressure detector, and a rack-and-pinion feedback assembly. The a rack-and-pinion feedback assembly provides the proportional adjustment of the feedback signal, thereby reducing the fluid consumption of the pneumatic controller.
    Type: Application
    Filed: September 20, 2007
    Publication date: April 3, 2008
    Inventor: Alexander C. Pesek
  • Publication number: 20080078448
    Abstract: A pneumatic controller for controlling a process advantageously reduces fluid consumption by providing a proportional adjustment to a feedback signal. The pneumatic controller comprises a pneumatic control stage, a process pressure detector, and a feedback proportioning device. The feedback proportioning device uses a feedback cantilever component to provide the proportional adjustment of the feedback signal, thereby reducing the fluid consumption of the pneumatic controller.
    Type: Application
    Filed: September 10, 2007
    Publication date: April 3, 2008
    Inventors: George W. Gassman, Alexander C. Pesek
  • Patent number: 7337041
    Abstract: Methods and apparatus related to feedback control for electro-pneumatic control systems are disclosed. An example electro-pneumatic control system comprises an electro-pneumatic controller and a secondary pneumatic power stage coupled to the electro-pneumatic controller to provide a feedback signal to the electro-pneumatic controller.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: February 26, 2008
    Assignee: Fisher Controls International
    Inventors: Kenneth William Junk, Christopher S. Metschke
  • Publication number: 20070235080
    Abstract: A fluid flow control device (26, 28) comprising a guide member (30) to guide a fluid passing through a duct (22, 24, 76), the guide member (30) being movable between first and second positions; and an urging arrangement (32) capable of providing an urging force (F1) to urge the guide member (30) towards the first position, characterised in that the urging arrangement (32) is a resilient torsion bar that is formed so as to allow the guide member (30) to be moved towards the second position by a pressure force (F2) exceeding and opposite to the urging force (F1), the pressure force (F2) being provided by a pressure difference across the guide member (30).
    Type: Application
    Filed: March 8, 2007
    Publication date: October 11, 2007
    Applicant: ROLLS-ROYCE PLC
    Inventor: Barry N. Hocking
  • Patent number: 7234483
    Abstract: An electro-pneumatic air pressure regulator includes a primary pressure introduction port, a secondary pressure output port, a pilot pressure chamber, a main valve for opening and closing a communicating conduit, a floating piston which actuates the main valve, a nozzle conduit via which the pilot pressure chamber is communicatively connected to the atmosphere, a flapper which includes a leaf spring facing an open end of the nozzle conduit, and an electromagnetic drive system which deforms the leaf spring to vary a position of the flapper relative to the open end of the nozzle conduit in accordance with the magnitude of an analogue input signal. The flapper includes a conical projection which projects toward the open end of the nozzle conduit. A conical recess corresponding to the conical projection is formed on an end face of the nozzle conduit around the open end thereof.
    Type: Grant
    Filed: June 2, 2004
    Date of Patent: June 26, 2007
    Assignee: Fujikura Rubber Ltd.
    Inventors: Masakuni Kainuma, Toshikazu Aoki, Keiji Tamaki, Katsuo Uematsu, Tomomasa Fujita, Hiroshi Chinda, Akihiro Hayashi, Mitsuaki Nakanishi
  • Publication number: 20030070710
    Abstract: A fluid pressure regulator has a program controller, a PID controller, a second PID controller, a drive controller, a solenoid-operated valve for supplying a fluid, a solenoid-operated valve for discharging a fluid, a diaphragm, a main valve, and a pressure sensor. Based on a desired preset value and/or a desired control program inputted from an external source, the fluid pressure regulator regulates the pressure or flow rate of the fluid discharged from a discharge port of the main valve. A detecting mechanism is combined with a controlled object for supplying a controlled variable in the controlled object to the second PID controller through a feedback loop.
    Type: Application
    Filed: October 10, 2002
    Publication date: April 17, 2003
    Applicant: SMC Kabushiki Kaisha
    Inventors: Naoto Inayama, Masao Kajitani
  • Patent number: 6527862
    Abstract: A control system for digitally monitoring and/or controlling pressure to a pneumatic load such as a stop/suckback valve. Pressure is sensed in the pneumatic fluid input lines to the pneumatic load, and a closed loop control is used to maintain the pressure at a predetermined level. In an alternative embodiment, the control system is used to ensure equal dispensing in multi-point dispense apparatus. Thus, pressure is sensed downstream of each valve in fluid communication with a respective nozzle. Any pressure differential detected is corrected by appropriate valve adjustment.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: March 4, 2003
    Assignee: Mykrolis Corporation
    Inventors: Robert F. McLoughlin, George L. Gonnella
  • Patent number: 6422532
    Abstract: A valve positioner for adjusting the position of a valve is provided. The valve positioner includes a housing having a service cartridge port and a valve connector. The valve positioner also includes a removable service cartridge having a cartridge housing received in the service cartridge port. The cartridge housing contains electronics and electro-pneumatic components associated with the valve positioner. The cartridge housing is configured such that removal does not expose the electronics and the electro-pneumatic components to an external environment.
    Type: Grant
    Filed: March 1, 2000
    Date of Patent: July 23, 2002
    Assignee: Invensys Systems, Inc.
    Inventor: Ronald N. Garner
  • Patent number: 6348098
    Abstract: A control system for digitally monitoring and/or controlling pressure to a pneumatic load such as a stop/suckback valve. Pressure is sensed in the pneumatic fluid input lines to the pneumatic load, and a closed loop control is used to maintain the pressure at a predetermined level. In an alternative embodiment, the control system is used to ensure equal dispensing in multi-point dispense apparatus. Thus, pressure is sensed downstream of each valve in fluid communication with a respective nozzle. Any pressure differential detected is corrected by appropriate valve adjustment.
    Type: Grant
    Filed: January 20, 2000
    Date of Patent: February 19, 2002
    Assignee: Mykrolis Corporation
    Inventors: Robert F. McLoughlin, George L. Gonnella, Timothy J. King
  • Patent number: 6323494
    Abstract: A transducer includes a pneumatic actuator in combination with a stepper motor lifter mechanism to which is opposed an attractive E-I core actuator for precise vertical positioning of a load with minimal transmission of vibration. A typical application is for vertical positioning of a stage in a lithography machine. The use of a stepper motor driving a lead screw and pneumatic actuator together with an attractive E-I core actuator provides a large dynamic range force actuator. The transducer has a sensor which is located spaced away from the E-I core actuator gap and which operates inductively to measure the gap. A compliant diaphragm for the pneumatic actuation allows the load to move a small amount in all six degrees of freedom.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: November 27, 2001
    Assignee: Nikon Corporation
    Inventor: Martin E. Lee
  • Patent number: 6295511
    Abstract: An apparatus for controlling and monitoring actuators with an open/close characteristic consists of a first unit having a drive switch unit for operating a drive force unit, at least one limit signal generator that detects an end position of an actuator of the drive force unit and an electronic unit, such as a microprocessor, which first unit is connected to a second unit by a twin-core cable, and the second unit includes an apparatus for operating the drive switch unit and for outputting the state of the limit signal generator.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: September 25, 2001
    Assignee: Samson Aktiengesellschaft
    Inventor: Lothar Kemmler
  • Patent number: 6240955
    Abstract: A liquid level controller is shown having a housing with a rear wall. A shaft has a first end which extends through the rear wall to a liquid displacement member located within a liquid containing vessel. A second end of the shaft joins a pair of oppositely extending arms. Each of the oppositely extending arms is rotationally mounted on the housing generally parallel to the rear wall in a bearing. Vertical forces responsive to changes in liquid level act on the displacement member and are transmitted as a force tending to rotate the oppositely extending arms. A lever pivotally mounted to the housing is interconnected with a torque bar which, in turn, connects to the oppositely extending arms of the shaft. A valving assembly is engaged by the lever to provide an output for controlling liquid level within the vessel. The valve assembly includes a pneumatic pilot with a contact point which is engageable by a pin carried on the lever.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: June 5, 2001
    Assignee: Anderson Controls, L.C.
    Inventors: R. David Anderson, Carl Wayne Winfrey, Randal Alan Winfrey
  • Patent number: 6171066
    Abstract: When a steplike reference signal is supplied while a switch is open, an offset signal for compensating for the dead time of a pneumatic device is generated by an offset generator and supplied as a manipulated variable for the pneumatic device. When a feedback increases in level and a speed higher than a reference speed is detected by a speed detector, the switch is closed by a switching signal, switching from a PD control mode to a PID control mode. The pneumatic device thus controlled has a reduced response time and can made a quick response.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: January 9, 2001
    Assignee: SMC Kabushiki Kaisha
    Inventors: Kenji Irokawa, Tomohiko Aki
  • Patent number: 6112638
    Abstract: The present invention includes an electropneumatic positioner having an external binary input block which provides access to the electrical output of an integral electronic position controller to control operation of a valve relay. The invention enables manual control of the positioner for safety, maintenance etc.
    Type: Grant
    Filed: April 30, 1999
    Date of Patent: September 5, 2000
    Assignee: The Foxboro Company
    Inventor: Michael Loechner
  • Patent number: 5992448
    Abstract: A liquid level controller is shown having a housing with a rear wall. A shaft has a first end which extends through the rear wall to a liquid displacement member located within a liquid containing vessel. A second end of the shaft joins a pair of oppositely extending arms. Each of the oppositely extending arms is rotationally mounted on the housing generally parallel to the rear wall in a bearing. Vertical forces responsive to changes in liquid level act on the displacement member and are transmitted as a force tending to rotate the oppositely extending arms. A lever pivotally mounted to the housing is interconnected with a torque bar which, in turn, connects to the oppositely extending arms of the shaft. A valving assembly is engaged by the lever to provide an output for controlling liquid level within the vessel. The valve assembly includes a pneumatic pilot with a contact point which is engageable by a pin carried on the lever.
    Type: Grant
    Filed: January 21, 1998
    Date of Patent: November 30, 1999
    Inventors: R. David Anderson, Carl Wayne Winfrey, Randal Alan Winfrey
  • Patent number: 5983926
    Abstract: A first pressure chamber and a second pressure chamber are provided with means for continuously exerting a constant inward pressure on a first diaphragm part and a third diaphragm part respectively. A valve chamber having a flow control portion wherein a flow rate of the controlled fluid flowing from an inflow chamber to an outflow chamber is controlled by changing a size of the opening defined between a valve part and a valve seat, caused by a displacement of the valve part of a valve mechanism. A differential pressure chamber connects with the outflow chamber and has a bypass opening of a bypass passage connecting to the outflow passage.
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: November 16, 1999
    Assignee: Advance Denki Kougyou Kabushiki Kaisha
    Inventor: Hironori Mastuzawa
  • Patent number: 5974945
    Abstract: A feedback control system (i.e., a positioner) for precise positioning of a pneumatic actuator by adjusting the flow of air to the pneumatic actuator comprises an adjustable gain mechanism for adjusting the sensitivity of the positioner. The adjustable gain mechanism is coupled between a feedback input device of the positioner and a valve control device and is employed to adjust the amount of air supplied to the pneumatic actuator for a given displacement of the feedback input device. Preferably the adjustable gain mechanism is adjustable through a range of settings between a high gain setting and a low gain setting, the high gain setting allowing a greater range of motion of the valve control device than the low gain setting for a given displacement of the feedback input device.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: November 2, 1999
    Assignee: Valtek, Inc.
    Inventor: Robert Gooch
  • Patent number: 5931180
    Abstract: An electropneumatic positioner includes a data processing control section and an electropneumatic converter. The control section includes first and second position determining sections and a signal setting section. The first position determining section obtains the valve opening degree positions of a regulating valve as the minimum and maximum valve opening degree positions which are set when a driving signal for conversion from an electrical signal into an air pressure is set to the minimum signal and the maximum signal. The second position determining section obtains the valve opening degree position of the valve which is set when the driving signal is the minimum signal on the basis of the relative positional relationship between the obtained minimum and maximum valve opening degree positions and the valve plug form of the valve.
    Type: Grant
    Filed: September 29, 1998
    Date of Patent: August 3, 1999
    Assignee: Yamatake Corporation
    Inventor: Fumio Nagasaka
  • Patent number: 5901034
    Abstract: The electronic instrument has a two-part housing (26, 27) which surrounds in a dusttight manner a printed board fitted with at least one electronic component. The housing (26, 27) contains a ventilating orifice (50) led through one of its two parts. A ventilating device (51) is arranged in this ventilating orifice (50), with an air-permeable diaphragm permeable to water vapor in a directionally dependent manner and with a splashwater guard preceding the diaphragm.Undesirable condensation water in the housing interior is avoided, since excess water vapor present in the housing interior is led outward through the diaphragm while the electronics are operating. At the same time, the splashwater guard prevents the diaphragm from coming into contact with splashwater and its operating capacity from being impaired.
    Type: Grant
    Filed: August 7, 1997
    Date of Patent: May 4, 1999
    Assignee: Asea Brown Boveri AG
    Inventor: Marcel Fuglister
  • Patent number: 5699824
    Abstract: An electrical-pneumatic system has a controller which has an input terminal for a reference variable signal, an input terminal for a regulating variable or feedback signal and an output terminal for a manipulated variable signal, which preferably is a pulse-width modulated signal. The controller will actuate a drive unit of an electrical-pneumatic pre-control unit, which has a 3/2 directional control valve that responds to the pulse-width modulated signal from the controller. The output of the 3/2 directional control valve is smoothed by being passed through a throttle and into a volume, and a pneumatic booster is connected downstream from the volume. The output of the pneumatic booster is sensed and provides the feedback signal.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: December 23, 1997
    Assignee: Samson Aktiengesellschaft
    Inventors: Lothar Kemmler, Stefan Kolbenschlag
  • Patent number: 5682918
    Abstract: A pressure control valve, which possesses a primary pressure port, a secondary pressure port and a venting port. For control of the secondary pressure a valve operating device is present which is actuated by a control pressure present in a control chamber. A mechanical spring device urges the valve operating device against the direction of action of the control pressure in such a manner that when ambient pressure obtains in the control chamber, it automatically assumes a basic setting, in which the secondary pressure port is connected with the venting port for fluid flow. It is in this manner that there is an automatic venting of the secondary pressure port when the control chamber is free of pressure.
    Type: Grant
    Filed: February 8, 1996
    Date of Patent: November 4, 1997
    Assignee: Festo KG
    Inventors: Kurt Stoll, Volker Quendt
  • Patent number: 5590677
    Abstract: An electropneumatic positioner includes an electropneumatic converter, an pilot relay, an operating unit, and a sensor. The electropneumatic converter includes a yoke having central and side leg portions, a permanent magnet arranged on the central leg portion, a pair of coils for exciting the side leg portions to have opposite polarities, a nozzle embedded in one side leg portion to spray air having predetermined pressure, a stopper arranged on the other side leg portion, and a flapper arranged to be swingable on a fulcrum near the central leg portion and serving to change a nozzle back pressure by controlling the amount of air sprayed from the nozzle in accordance with a swing. The electropneumatic converter receives a duty signal, as a driving signal for the coils, which signal is obtained by converting a deviation between an input signal and a feedback signal into a duty. The flapper is set to be parallel to the yoke when the deviation between the input signal and the feedback signal is zero.
    Type: Grant
    Filed: June 20, 1995
    Date of Patent: January 7, 1997
    Assignee: Yamatake-Honeywell Co., Ltd.
    Inventor: Masato Kuroda
  • Patent number: 5586575
    Abstract: An electropneumatic converter controlled by solenoid valves, in which the solenoid valves are connected respectively to the feed pressure and to atmosphere, each via a pressure regulator controlled by a differential pressure measurement device connected across a respective solenoid valve, so as to maintain a constant pressure difference across the solenoid valves.
    Type: Grant
    Filed: June 15, 1994
    Date of Patent: December 24, 1996
    Assignee: Nuovopignone- Industrie Meccaniche e Fonderia S.p.A.
    Inventors: Giorgio Bergamini, Venanzio Mininni
  • Patent number: 5542337
    Abstract: A device capable of comparing the travel position of an output shaft of a diaphragm actuator or cylinder with the current level of an electronic input signal and further being capable of manipulating the pressure of a separate air signal piped to a diaphragm actuator or cylinder in order to correct any imbalance between such a shaft position and a given electronic signal level, including the ability of varying its dynamic response through built in adjustments.
    Type: Grant
    Filed: December 29, 1994
    Date of Patent: August 6, 1996
    Inventor: Hans D. Baumann
  • Patent number: 5538036
    Abstract: A control system for a pneumatic valve actuator comprising three operating blocks memorizing respectively the values of the spring pressure p.sub.m, the counter-thrust pressure p.sub.c and the friction pressure p.sub.a for the various valving member position values, said blocks being connected in parallel and, via a switch, to the valving member position transducer or to the set position generator and connected to the pressure computing block connected via a second switch to the pressure generator or, together with the value read by a transducer for the pressure existing in the actuator, to a differentiator connected to two multiplier units for K and for (1-K) respectively, which are connected to the transit memory of the p.sub.c operating block and to the p.sub.a operating block respectively, the switches being driven by a logic control unit which switches over when the valving member is at rest. Means are provided for sensing anomalies and the extent of wear.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: July 23, 1996
    Assignee: Nuovo Pignone S.p.A.
    Inventors: Giorgio Bergamini, Venanzio Mininni
  • Patent number: 5533544
    Abstract: An electro-pneumatic converter device with modular components and with supporting housing structure enabling the device to be readily convertible from a current to pressure positioner to a current to pressure transducer. A valve positioner with an enclosure having a housing, a modular base, and a separable field terminal box. A self contained cover mounted to the enclosure with no additional mounting components. A plastic pneumatic relay ultrasonically welded together to eliminate metal mounting parts and lower assembly time. Open channels in a housing surface cooperating with a gasket to provide fluid passageways between the housing and the modular base. Pressure gauges are removably mounted on a modular unit for location completely within the housing. A floating interconnect terminal board permits self-aligning of mating terminals as the modular unit is inserted into the housing.
    Type: Grant
    Filed: May 31, 1995
    Date of Patent: July 9, 1996
    Assignee: Fisher Controls International, Inc.
    Inventors: Stanley R. Good, Barry L. Gaarder