Plural Series Units Patents (Class 137/84)
  • Patent number: 9140195
    Abstract: Gas turbine, software and method for controlling an operating point of the gas turbine that includes a compressor, a combustor and at least a turbine is provided. The method includes determining a turbine exhaust pressure at an exhaust of the turbine; measuring a compressor pressure discharge at the compressor; determining a turbine pressure ratio based on the turbine exhaust pressure and the compressor pressure discharge; calculating an exhaust temperature at the exhaust of the turbine as a function of the turbine pressure ratio; identifying a reference exhaust temperature curve in a plane defined by the exhaust temperature and the turbine pressure ratio; and controlling the gas turbine to maintain the operating point on the reference exhaust temperature curve.
    Type: Grant
    Filed: November 19, 2010
    Date of Patent: September 22, 2015
    Assignee: Nuovo Pignone S.P.A.
    Inventor: Claudio Botarelli
  • 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
  • Patent number: 7618391
    Abstract: Microfluidic shunt valves are disclosed having a deflectable element capable of being held in a closed position to occlude the passage of fluid between an inlet and outlet and, when not held in the closed position, the deflectable element is adapted to oscillate in response to fluid pressure pulses and thereby facilitate fluid passage through the valve. Controls for activating the deflectable element to permit fluid passage are also included.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: November 17, 2009
    Assignees: Children's Medical Center Corporation, New Jersey Institute of Technology
    Inventors: Joseph R. Madsen, Dentcho Ivanov
  • Patent number: 7267137
    Abstract: A deadweight pressure standard provides improved measurement accuracy and repeatability. The standard includes a flow regulator having a first valve controlled by a first pair of non-hysteresis sylphons, and a supply regulator having a second valve controlled by a second pair of non-hysteresis sylphons. The first and second valves achieve an equilibrium state between the supply regulator and the flow regulator. The second valve regulates pressure generated by an applied pressure supply. A mass-to-pressure transducer transforms an applied gravitational force into a reference pressure regulated by the first valve. The center of pressure force on the first pair of non-hysteresis sylphons, and the center of pressure force on the first valve, are exerted along a first reference axis. The center of pressure force on the second pair of non-hysteresis sylphons, and the center of pressure force on the second valve, are exerted along a second reference axis.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: September 11, 2007
    Inventor: Lev Shildkret
  • Patent number: 6623248
    Abstract: A system tot the pulsation-free delivery of liquids, which system may be used for high-purity, liquid chemicals in the semiconductor industry.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: September 23, 2003
    Assignee: Merck Patent GmbH
    Inventors: Claus Dusemund, Klaus Freissler, Wilfried Jammer, Michael Poth, Alberto Dix, Eberhard Tempel
  • Patent number: 6415617
    Abstract: A strategy for controlling an air side economizer of an HVAC system uses a model of the airflow through the system to estimate the load in two modes when minimum and maximum amounts of outdoor air are being introduced into the building. Transitions between minimum outdoor air and maximum outdoor air usage occur based on those estimated loads, which in a preferred embodiment are cooling loads. The second embodiment of this economizer control strategy uses the model and a one-dimensional optimization routine to determine the fraction of outdoor air that minimizes the load on the HVAC system.
    Type: Grant
    Filed: January 10, 2001
    Date of Patent: July 9, 2002
    Assignee: Johnson Controls Technology Company
    Inventor: John E. Seem
  • Patent number: 6224356
    Abstract: A valve return passage for quickly returning a valve to a closed position, includes return passages for communicating discharge pressurized fluid to a rear surface of a floating valve. The use of the return passages ensures that pressurized gas is communicated quickly to close the valve at shut down. This reduces the noise of operation of the compressor.
    Type: Grant
    Filed: January 5, 2000
    Date of Patent: May 1, 2001
    Assignee: Scroll Technologies
    Inventors: Todd William Dewar, Tracy Milliff
  • 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: 5873946
    Abstract: An installation for lubricating, cleaning and/or disinfecting conveyor belts for containers, more particularly for foods, such as bottles, glasses, cans, bags and the like, comprising a central metering station connectable to a water pipe used to dilute a concentrated lubricant, cleaner or disinfectant, and several distributing pipes connected to the metering station lead to the points of use. At each point of use there is a mixing valve (13-19) connectable to distribution line (52) and the water pipe (23) and individually adjustable for each point of use and a pressure reducer (50, 51) fitted upstream of each mixing valve. Varying concentration can be provided for each point of use (31-37) with little technical complexity. In another embodiment, the invention is the process carried out by the installation.
    Type: Grant
    Filed: March 25, 1996
    Date of Patent: February 23, 1999
    Assignee: Henkel-Ecolab GmbH & Co. Ohg
    Inventor: Bernhard Hantmann
  • Patent number: 5439021
    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: August 31, 1993
    Date of Patent: August 8, 1995
    Assignee: Fisher Controls International, Inc.
    Inventors: Brian J. Burlage, Steven B. Pauller, Stanley R. Good, Barry L. Gaarder
  • Patent number: 5257639
    Abstract: A transducer having an explosion-proof housing with a divider forming two compartments, and the divider having formed therein a well. A magnet and flapper arm arrangement is suspended within the well. A coil winding is fixed in the other compartment around the well so that a magnetic field generated thereby influences the pivotal position of the magnet. Set screws adjustable in the bottom of the well are effective to preset a rest position of the magnet.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: November 2, 1993
    Assignee: Dresser Industries, Inc.
    Inventors: Robert C. Prescott, Donald C. Simpson, Philip H. Sanford, Howard W. Nudd
  • Patent number: 5159949
    Abstract: A transducer having an explosion-proof housing with a divider forming two compartments, and the divider having formed therein a well. A magnet and flapper arm arrangement is suspended within the well. A coil winding is fixed in the other compartment around the well so that a magnetic field generated thereby influences the pivotal position of the magnet. Set screws adjustable in the bottom of the well are effective to preset a rest position of the magnet.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: November 3, 1992
    Assignee: Dresser Industries, Inc.
    Inventors: Robert C. Prescott, Donald C. Simpson, Philip H. Sanford, Howard W. Nudd
  • Patent number: 4953578
    Abstract: This invention relates to a pneumatic control device having an operating mode selecting means for operating in either the manual or automatic modes. Pneumatic pressure is regulated in the manual mode by a hand operated leakport, and in the automatic mode by a voice coil or other pressure regulating device. The pneumatic input supply, manual pressure regulating means and voice coil all communicate at a common surface. The mode selecting means slides across this common surface to connect together the pneumatic input supply with one of the selected pressure regulating means.
    Type: Grant
    Filed: November 2, 1989
    Date of Patent: September 4, 1990
    Assignee: Johnson Service Company
    Inventor: Thomas O. Kautz
  • Patent number: 4821760
    Abstract: An electropneumatic converter is provided with a voice coil having a vane directly connected to the coil. The vane and coil assembly is attached to a spring and resiliently supported by the spring for movement relative a nozzle outlet in response to dc input signals applied to the coil.
    Type: Grant
    Filed: September 28, 1984
    Date of Patent: April 18, 1989
    Assignee: The Babcock & Wilcox Company
    Inventors: Christine B. Barnes, Thomas E. Martin, Frank E. Nardis
  • Patent number: 4804009
    Abstract: The incremental interface system of the present invention includes a pneumatic input means for providing a first pressure to be regulated. A pressure repeater means includes a volume relay having a first chamber coupled to the intermediate bus of the input means and a second chamber coupled to a pneumatic transducer to be controlled, the first chamber and the second chamber being in fluid flow isolation one from the other. The pressure repeater means provides a second pressure at its second chamber which has a predetermined relationship to the first pressure. A reservoir means is coupled to the intermediate bus between the input means and the repeater means for limiting the rate of change of the first pressure. The input means, repeater means and reservoir means cooperate to define a substantially constant volume of fluid.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: February 14, 1989
    Assignee: Johnson Service Company
    Inventor: Mark S. Bergmann
  • Patent number: 4770200
    Abstract: The interface apparatus of the present invention includes a pneumatic flow control means for controlling the number of moles of a gas confined within a substantially constant volume of gas at a first pressure. A volume relay has a first chamber coupled to the control means by a pneumatic bus and a second chamber for coupling to a pneumatic transducer to be positionably controlled, the first chamber and the second chamber being in fluid flow isolation one from the other. The volume relay provides a second pressure at its second chamber which has a predetermined relationship to the first pressure. A substantially constant, confined volume is coupled to the flow control means and to the relay and the flow control means includes means for adjusting the rate of flow of gas from the substantially constant volume to a region of ambient pressure.
    Type: Grant
    Filed: August 20, 1987
    Date of Patent: September 13, 1988
    Assignee: Johnson Service Company
    Inventors: Clay G. Nesler, Thomas O. Kautz, Mark S. Bergman
  • Patent number: 4760859
    Abstract: A modular transmitter has an outer housing with a wall forming an interior cavity in which a control module is inserted. The wall has one or more ports therein that are connected to pressure conduits. When the control module is fully seated, the ports align with internal passageways in the control module that lead to control components in the control module. The control module further has an electrical circuit supported on an end thereof that is toward the inner end of the cavity when the control module is inserted and the circuit has components that removably mate with further elements mounted on the end wall of the cavity. These connections may include electrical contacts, and also rotationally adjustable components that have set points and which are coupled to set point adjustment and control shafts that are accessible from the opposite side of the end wall from the cavity.
    Type: Grant
    Filed: May 18, 1987
    Date of Patent: August 2, 1988
    Assignee: Rosemount Inc.
    Inventor: Gregory C. Brown
  • Patent number: 4715397
    Abstract: A pressure regulator (75) of a flow control system includes a pair of orifices (140 and 145), the effective areas of which are controlled by a pair of flexible closures (150 and 155) unidirectionally stiffened against fluid flow thereagainst. The closures remain flexible in an opposite direction so that when one of the closures is fouled with contaminants, it does not impede the operation of the remaining closure.
    Type: Grant
    Filed: August 6, 1984
    Date of Patent: December 29, 1987
    Assignee: United Technologies Corporation
    Inventor: Charles F. Stearns
  • Patent number: 4679583
    Abstract: A pneumatic control system, control unit and method of making the same are provided, the system comprising a pneumatic source, a pneumatically operated device that produces an output, and a control unit for interconnecting the source to the device. The control unit has an input interconnected to the source and an output interconnected to the device, the control unit having a set point for selecting a desired output of the device. The control unit has a valve unit for controlling the interconnection between the input and the output thereof so as to regulate the pressure value in the output of the control unit. The control unit has a regulating unit for operating the valve unit to tend to produce an output of the device that corresponds to the selected output of the set point.
    Type: Grant
    Filed: December 23, 1985
    Date of Patent: July 14, 1987
    Assignee: Robertshaw Controls Company
    Inventors: William L. Lucas, Clarence M. Asbill, III, Gerald L. Frank, David M. Miller
  • Patent number: 4665938
    Abstract: A current-to-pressure (I/P) converter provides an output pressure as a function of the magnitude of a variable input DC current. The I/P converter includes a pressure sensor which produces a feedback signal representative of the output pressure. Based upon the feedback signal and the magnitude of the input DC current, an electrical control signal is produced which controls a device for varying the output pressure. The I/P converter also includes a circuit for generating a time-varying signal which is sent back over the current loop wires through which the input DC current flows. The time-varying signal provides an indication of whether the I/P converter is functioning properly. This permits diagnosis of possible causes of control system malfunctions without having to inspect the I/P converter itself.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: May 19, 1987
    Assignee: Rosemount Inc.
    Inventors: Gregory C. Brown, Gerald R. Cucci
  • Patent number: 4616670
    Abstract: An extremely accurate and reliable fluid pressure sensor for monitoring process pressure and sensing when predetermined pressure set points or limits have been reached. A Bourdon tube with a pivotally moving lever end responds to the process pressure. When the process pressure is within the desired pressure range, a fluid operated block and bleed relay is operated to provide a first pressure level at its outlet. As the preset pressure point is reached, the relay is operated to provide a change in the outlet pressure level for actuating suitable safety units. A pivoting beam responds to pivoting movement of the Bourdon tube lever arm about the pressure set points and effectively amplifiers or increases such movement to rapidly operate the relay. Snap-acting cap means with a self-aligning disc cap a nozzle port in the relay in response to pivoting beam movement.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: October 14, 1986
    Assignee: Fisher Controls International, Inc.
    Inventors: John W. Duffy, Robert A. Funke, David W. Shollenbarger
  • Patent number: 4611619
    Abstract: A pneumatic condition sensing system for reducing the consumption of air supplied by a pneumatic source, the system having a bleed type pneumatic device for bleeding air from a branch line to atmosphere to control the pressure within the branch line in response to a sensed condition, an elongated restriction for connecting the bleed type device to the pneumatic source, the elongated restriction having an air conserving flow versus pressure relationship, and a controller connected to the branch line and responsive to the pressure therein for providing a control function usable in controlling a condition.
    Type: Grant
    Filed: July 17, 1985
    Date of Patent: September 16, 1986
    Assignee: Honeywell Inc.
    Inventor: Peter P. Payne
  • Patent number: 4605033
    Abstract: A pneumatic positioner is provided with a O-shaped vane that is movably supported at the ends of each of its legs. The nozzle has an air outlet proximate to and aligned with the vane. A nozzle, connected to a source of air under pressure, is attached to a disc for rotation about a central stem that extends through the O-shaped recess. The nozzle has an air outlet proximate to and aligned with the vane. The disc is rotatable about the stem to reposition the nozzle relative to the vane so that air issuing from the outlet of the nozzle can impinge upon the vane at different locations along the length of the vane, intermediate the ends of the legs of the vane. One end of the vane is attached to an input and feedback signal mechanism and the opposite end of the vane is connected to a relay center structure.
    Type: Grant
    Filed: September 27, 1984
    Date of Patent: August 12, 1986
    Assignee: The Babcock & Wilcox Company
    Inventor: Lee A. Weber
  • Patent number: 4576194
    Abstract: A pneumatic control system, control unit and method of making the same are provided, the system comprising a pneumatic source, a pneumatically operated device that produces an output, and a control unit for interconnecting the source to the device. The control unit has an input interconnected to the source and an output interconnected to the device, the control unit having a set point for selecting a desired output of the device. The control unit has a valve unit for controlling the interconnection between the input and the output thereof so as to regulate the pressure value in the output of the control unit. The control unit has a regulating unit for operating the valve unit to tend to produce an output of the device that corresponds to the selected output of the set point.
    Type: Grant
    Filed: April 19, 1984
    Date of Patent: March 18, 1986
    Assignee: Robertshaw Controls Company
    Inventors: William L. Lucas, Clarence M. Asbill, III, Gerald L. Frank, David M. Miller
  • Patent number: 4554938
    Abstract: In a device for converting electric signals into pneumatic signals, a soft-iron core (3) and a coil (2) are arranged stationary. The soft-iron core has an air gap (7) between two pole shoes (5, 6). A permanent magnet (8) is movably arranged within this gap (7) or directly in front of it. The permanent magnet can be fastened, for instance, to one lever arm of a rocker (9). The other lever arm of the rocker (9) is then developed as baffle plate (11) adapted to throttle the stream of air emerging from a pneumatic nozzle (12) to a greater or lesser extent depending on the position of the rocker. The dynamic pressure of this stream of air is fed via a booster (15) to an outlet (20).
    Type: Grant
    Filed: January 27, 1983
    Date of Patent: November 26, 1985
    Assignee: VDO Adolf Schindling AG
    Inventor: Lorenz Twisselmann
  • Patent number: 4543975
    Abstract: A fluid pressure regulating valve includes a diaphragm piston reciprocally movable within a valve housing, whereby undesirable diaphragm piston flutter is effectively dampened by use of a dampening member. The diaphragm piston separates a control chamber from an outlet chamber which is in communication with a fluid pressure receiving device. A selectively controllable solenoid valve controls the fluid pressure level in the control chamber. Differences in fluid pressure levels across the diaphragm piston result in the reciprocal movement, thereby, such movement being preconditioned to occur as a function of the fluid pressure level in the control chamber. An inlet valve and an outlet valve each communicate with the outlet chamber and are operated according to the position of the diaphragm piston. Furthermore, the inlet and outlet valves are connected by a connecting rod such that their operation is mutually dependent.
    Type: Grant
    Filed: December 19, 1983
    Date of Patent: October 1, 1985
    Assignee: WABCO Westinghouse Steuerungstechnik GmbH
    Inventors: Wilhelm Bachmann, Axel Kemner
  • Patent number: 4534376
    Abstract: An electric signal to pneumatic signal transducer 10 comprises a nozzle 12 that accepts an input pneumatic supply and expels a gas stream 20. A receiver 16 that is spaced from the nozzle is positioned to recover at least a portion of the gas stream. The recovered portion constitutes a pneumatic output signal. The position of a deflector 14 relative to the gas stream is controlled by an electric input signal to aerodynamically deflect the gas stream expelled from the nozzle. The aerodynamic deflection affects the magnitude of the portion of the gas stream recovered by the receiver in a manner having a known relationship to the electric input signal, thereby generating a pneumatic output signal responsive to the electric input signal.
    Type: Grant
    Filed: September 1, 1983
    Date of Patent: August 13, 1985
    Assignee: Rosemount Inc.
    Inventor: Gregory C. Brown
  • Patent number: 4532951
    Abstract: An electrical-pneumatic transducer includes a pneumatic relay in which the pressure of the air at the outlet varies in accordance with the back pressure of the air at a bleed nozzle in the relay. This back pressure is changed by the armature of a solenoid with the armature opposing the nozzle outlet and being urged toward the latter with a force responsive to a signal in the form of current flowing through the solenoid coil. The magnitude of the current is correlated with the magnitude of a variable condition. The force on the armature, which is a permanent magnet, is selectively set to calibrate the transducer by means of a second permanent magnet which is axially aligned with the armature and is adjustably movable toward and away from the latter.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: August 6, 1985
    Assignee: Barber-Colman Company
    Inventor: Raymond J. Fermanich
  • Patent number: 4509403
    Abstract: A positioner-actuator control system includes a pair of relays and a pivotally mounted beam for operation thereof in response to a pneumatic control signal. A summing beam has forces applied to it from an input signal, a controlled device position lever, a zero adjustment and a damping mechanism comprising a pair of flat springs attached to the relay beam and to the summing beam. A clamp is movable along the flat springs to permit user adjustment of the damping force.
    Type: Grant
    Filed: April 23, 1982
    Date of Patent: April 9, 1985
    Assignee: Fisher Controls International, Inc.
    Inventors: George W. Gassman, Gerald F. Varnum
  • Patent number: 4428391
    Abstract: A circuit for pneumatic controllers, a proportional-action range of which is adjustable, with the circuit including at least one differential amplifier having input pressure chambers being exposed to pressures derived between two throttle resistors respectively inserted in the measured value X input line and the desired value W-input line. All of the resistors are constant and a connecting line is interposed between connecting sections of the resistors, with the connecting line being provided with an adjustable throttle resistor.
    Type: Grant
    Filed: May 21, 1981
    Date of Patent: January 31, 1984
    Assignee: Eckardt AG
    Inventor: Horst Bader
  • Patent number: 4421271
    Abstract: A pneumatic subbase for modifying the operation of a pneumatic thermostat is disclosed having a first nozzle to be connected to a source of main pressure, a second nozzle for supplying branch output pressure to the device being controlled, a third nozzle connected through the subbase to the first nozzle for supplying main pressure to a thermostat and a fourth nozzle connected to receive the output from the thermostat, the subbase having a dwell relay therein for providing a dwell in the branch output pressure of the second nozzle as a function of the pressure received from the thermostat at the fourth nozzle.
    Type: Grant
    Filed: March 15, 1979
    Date of Patent: December 20, 1983
    Assignee: Honeywell Inc.
    Inventor: Gideon Shavit
  • Patent number: 4336819
    Abstract: A pneumatic converter comprising a bellows having in its interior a coupling plate connecting the two ends of the bellows together at a position offset from the center axis of the bellows.
    Type: Grant
    Filed: December 6, 1979
    Date of Patent: June 29, 1982
    Assignee: Yokogawa Electric Works, Ltd.
    Inventor: Tadashi Nishihara
  • Patent number: 4332269
    Abstract: A pneumatic device is arranged for reducing positive feedback and includes a housing having a diaphragm defining a control chamber, the control chamber being connected to an input and having a pressure therein dependent upon an input pressure, the control chamber having a nozzle therein and operatively associated with the diaphragm so that the position of the diaphragm with respect to the nozzle controls the pressure within the control chamber, the nozzle being sloped for substantially reducing positive feedback resulting from bleeding of the pressure from the nozzle into the control chamber and an output connected to the control chamber for providing an output pressure.
    Type: Grant
    Filed: September 29, 1980
    Date of Patent: June 1, 1982
    Assignee: Honeywell Inc.
    Inventors: Ronald L. Martin, Mario M. V. Orrico
  • Patent number: 4314578
    Abstract: A fluid signal inverting unit includes a motion balance unit having a lever which operates a valve. The balance lever is supported at the opposite ends by a pilot signal chamber and a feedback signal chamber and an intermediate pivot support is coupled to position a back pressure leakport valve. Each chamber includes an outer matched linear metal diaphragm fixedly connected to the aligned end of the lever. Increases in pilot pressure result in the outward movement of the linear diaphragm and corresponding outward and pivotal movement of the lever. The lever tends to move away from and open the valve resulting in a decrease in the output pressure and an inverted output pressure signal which may be further amplified and transmitted to a flow booster relay, and as negative feedback signal to the feedback chamber. Decrease in pilot pressure results in an opposite action and an increase output pressure.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: February 9, 1982
    Assignee: Johnson Controls, Inc.
    Inventor: Warren A. Lederman
  • Patent number: 4312475
    Abstract: An adjustment mechanism for adjusting the maximum flow rate of conditioned air in an air distribution system controlled by a pneumatic control circuit. An air bladder controls the distribution of air, and the pressure is bled from the bladder under the control of a diaphragm against which pressure is fed back from the downstream side of the bladder. The control orifice through which the bladder pressure is exhausted is formed in the end of an exhaust tube that is axially adjustable. A cam and set screw arrangement serves to extend and retract the exhaust tube to move the control orifice toward and away from the diaphragm for adjustment of the maximum flow rate.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: January 26, 1982
    Assignee: Tempmaster Corporation
    Inventors: Douglas F. Edwards, Ronald S. Zimmer, Raymond H. Dean
  • Patent number: 4290441
    Abstract: A control device having a housing provided with a main lever pivotally mounted thereto by a pivot structure and being operatively associated with a flapper to move the same relative to a leakport in relation to pivotal movement of the main lever. The device has a feedback diaphragm operatively associated with a feedback lever that is pivotally mounted to the housing and is operatively associated with the main lever to cause pivoting thereof upon pivoting movement of the feedback lever by the feedback diaphragm. The device has means for selectively changing the device to be either direct acting or reverse acting.
    Type: Grant
    Filed: May 17, 1979
    Date of Patent: September 22, 1981
    Assignee: RobertShaw Controls Company
    Inventors: Douglas R. Scott, Larry V. Price
  • Patent number: 4285357
    Abstract: A pneumatic relay responsive to an air input signal whose pressure represents a variable, the relay producing an air output signal proportional thereto. The relay includes an input chamber to which the input signal is fed, this chamber being separated from an output chamber by a diaphragm of elastomeric material. Air from a constant high-pressure supply is fed into the output chamber through an adjustable supply port that is operatively coupled to the diaphragm to cause this port to open to an extent determined by the deflection of the diaphragm in response to the force produced by the pressure of air in the input chamber until a point is reached where the pressure developed in the output chamber attains equilibrium with that in the input chamber.
    Type: Grant
    Filed: January 16, 1980
    Date of Patent: August 25, 1981
    Assignee: Fischer & Porter Co.
    Inventor: Richard A. Jones
  • Patent number: 4263931
    Abstract: A mixed air conditioning controller is formed as a factory assembled and adjusted unit in a compact housing, with simple and direct input/output field connectors. Various temperature and humidity input devices are field connected to produce a sequenced control of the air dampers and mechanical cooling and heating devices, as well as auxiliary devices. The controller includes a primary input related to room demand, an outside air temperature input, with an interlocked control to the damper, a fan status input, a minimum air supply control and a by-pass switch having a low limit input. The logic network connecting the input/output includes pneumatic switching, pressure selecting and comparing devices of a diaphragm-controlled-orifice construction connected to function as fluidic repeaters, pressure regulating valves and pressure isolating and switching devices. The controller includes a conditioning channel and a damper channel.
    Type: Grant
    Filed: November 9, 1979
    Date of Patent: April 28, 1981
    Assignee: Johnson Controls, Inc.
    Inventors: Scott B. Bramow, Richard N. Laakaniemi, Paul E. Wichman
  • Patent number: 4209030
    Abstract: A self-contained control device for a system having a first source provided with a changeable fluid pressure value and a second source provided with a changeable vacuum value and having a pressure operated control unit that changes its operating condition in relation to the value of the pressure signal directed thereto, the control device having pneumatically operated control means adapted to be operatively interconnected to the sources and the control unit for increasing the pressure signal from the first source to the unit as the pressure value from the first source increases from a first value thereof to a second value thereof and for thereafter decreasing the pressure signal from the first source to the unit as the pressure value from the first source further increases from the second value thereof to a third value thereof. The control means are adapted to produce the signal in substantially the same manner but at different values for different levels of vacuum at the second source.
    Type: Grant
    Filed: September 13, 1978
    Date of Patent: June 24, 1980
    Assignee: Robertshaw Controls Company
    Inventor: Clifford E. Goff
  • Patent number: 4169485
    Abstract: A system having a vacuum source, a pressure source and a pressure operated control device. A pneumatically operated control unit is provided for increasing a pressure signal from the pressure source to the device as the value of the pressure of the pressure source increases from a first value to a second value and for thereafter decreasing the pressure signal from the pressure source to the device as the value of the pressure of the pressure source further increases from the second value thereof to a third value thereof, the control unit producing the signal in substantially the same manner but at different values for different levels of vacuum at the vacuum source thereof. The control unit can include a temperature responsive valve for substantially linearly changing the magnitude of the signal to the device in relation to a certain temperature range.
    Type: Grant
    Filed: April 12, 1978
    Date of Patent: October 2, 1979
    Assignee: Robertshaw Controls Company
    Inventor: Harold G. Brakebill
  • Patent number: 4153068
    Abstract: Discloses a pneumatic controller having a proportional band altering unit, a proportional plus integral operation unit, a comparator and a manual-automatic transfer means, wherein the proportional band altering unit is combined with the proportional plus integral operation unit to provide a proportional band altering mechanism which limits input to prevent output of the comparator from being saturated whereby to enable the pneumatic controller to perform the transfer between the manual and automatic modes in a balanceless and bumpless manner.
    Type: Grant
    Filed: November 8, 1977
    Date of Patent: May 8, 1979
    Assignee: Hokushin Electric Works, Ltd.
    Inventor: Takeshi Yoshida
  • Patent number: 4151856
    Abstract: A primary element is connected to a control element of a first fluid pressure relay to move the element to positions at which pressure fluid outputs of relatively small volumes will be generated to represent the element positions. The pressure fluid outputs of the first relay are directed to the input of a second relay which generates pressure values for pressure fluid which are proportional to the first relay outputs in, and at, relatively larger volumes of the pressure fluid.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: May 1, 1979
    Assignee: Combustion Engineering, Inc.
    Inventor: Billy S. Burrus
  • Patent number: 4151953
    Abstract: A thermopneumatic actuator of the invention is used to control an automobile heater and/or air conditioner to maintain a desired temperature in the automobile passenger compartment through a mechanical output member of the actuator. The output member is connected to and moved by a diaphragm which is positioned by vacuum introduced from the automobile intake manifold and works against a diaphragm spring. A valve is controlled by a bimetal spring exposed to air from the passenger compartment to modulate the vacuum applied to the diaphragm. A feedback spring connected between the diaphragm and the valve works against the bimetal spring. An aspirator comprising a venturi tube causes air flow from the passenger compartment around the bimetal spring.
    Type: Grant
    Filed: October 11, 1977
    Date of Patent: May 1, 1979
    Assignee: Diesel Kiki Company, Ltd.
    Inventor: Hiroyuki Sugiura
  • Patent number: 4099539
    Abstract: A system having a vacuum source, a pressure source and a pressure operated control device. A pneumatically operated control unit is provided for increasing a pressure signal from the pressure source to the device as the value of the pressure of the pressure source increases from a first value to a second value and for thereafter decreasing the pressure signal from the pressure source to the device as the value of the pressure of the pressure source further increases from the second value thereof to a third value thereof, the control unit producing the signal in substantially the same manner but at different values for different levels of vacuum at the vacuum source thereof. The control unit can include a temperature responsive valve for substantially linearly changing the magnitude of the signal to the device in relation to a certain temperature range.
    Type: Grant
    Filed: May 25, 1977
    Date of Patent: July 11, 1978
    Assignee: Robertshaw Controls Company
    Inventor: Harold G. Brakebill
  • Patent number: 4055197
    Abstract: The invention contemplates improved hydraulic-pressure control apparatus which will proportionally reflect input-signal changes governing a wide range of output pressures. Use of a separate preamplifier stage, between a signal-pressure stage and a power stage, enables the signal pressure to remain essentially unaffected by load reaction or other transients at the power stage. In the forms described, an input electrical signal determines a step-function program of signal-pressure levels, and the power stage includes a relief valve which so diverts system-line flow to a sump as to assure quick and accurate response of system-line pressure to the instantaneous input electrical-signal level, all without system-pressure overshoot.
    Type: Grant
    Filed: September 10, 1976
    Date of Patent: October 25, 1977
    Assignee: De Laval Turbine Inc.
    Inventor: Robert E. Raymond
  • Patent number: 4044651
    Abstract: A function generator is provided which establishes an output signal according to a functional relationship determined by the preformed contour of an easily precut cam member. The function generator includes a variable gain controller section coupled to a proximity sensing motion balance servomechanism which varies the gain of the controller according to the sensed proximity of the servomechanism to the edge of the cam member without physical contact therewith. The cam member's position is in turn determined by an input signal which may be related to the controller input signals or may be an independent signal from a remote source. The gain and consequently the output of the controller is varied according to the functional relationship determined by the precut contour of the cam member.
    Type: Grant
    Filed: September 7, 1976
    Date of Patent: August 30, 1977
    Assignee: Bailey Meter Company
    Inventor: James C. Warrick
  • Patent number: 3994311
    Abstract: A pneumatic amplifier is disclosed having a body, the body with two opposed heads, a sensor head, and a valve head. An air direction chamber is defined interiorly of the two heads and body, and is separated from the sensing chamber by means of a sealed piston. The piston is actuated at one side by means of back pressure on a jet orifice which is connected to a sensor supply, and the back pressure is translated into a movement of the flexible piston. In the valve chamber, a dart valve is actuated on one end by the piston, and its cone at the other end seats in a valve seat in pneumatic connection with the valve head. The valve head has a signal supply which, when not by-passed through the dart and its associated valve, passes out through a signal tube to actuate a signal device, whether ultimately pneumatic, electric, hydraulic, or other source of power. Optionally a diaphragm type piston is employed.
    Type: Grant
    Filed: June 2, 1975
    Date of Patent: November 30, 1976
    Assignee: Tangen Drives, Inc.
    Inventor: L. Irwin Walle
  • Patent number: 3978876
    Abstract: A high stability pneumatic pressure regulator is provided by the use of a movable vane and nozzle assembly to operate a valve plug and thereby change the regulator output pressure. Movement of the vane and nozzle assembly is initiated by an adjustable input member which changes the vane to nozzle spacing and subsequently causes the vane and nozzle assembly to move with the valve plug until the normal vane to nozzle spacing is restored. A feedback of the output pressure is used to balance the adjustable input member.
    Type: Grant
    Filed: May 23, 1975
    Date of Patent: September 7, 1976
    Assignee: Bailey Meter Company
    Inventors: Thomas E. Stevenson, Kenneth W. Cohen
  • Patent number: 3971396
    Abstract: A pneumatic apparatus or relay which, in one embodiment, maintains the output pressure at a fixed level until the signal pressure obtains a predetermined value at which time the output pressure varies according to the signal pressure and, in a second embodiment, maintains the output pressure at a first level, which may be essentially zero, until the signal pressure obtains a predetermined value at which time the output pressure assumes a second level until the signal pressure reaches a second predetermined value and then the output pressure varies according to the signal pressure.
    Type: Grant
    Filed: July 16, 1975
    Date of Patent: July 27, 1976
    Assignee: Honeywell Inc.
    Inventor: Louis J. Bentsen
  • Patent number: RE34202
    Abstract: This invention relates to a pneumatic control device having an operating mode selecting means for operating in either the manual or automatic modes. Pneumatic pressure is regulated in the manual mode by a hand operated leakport, and in the automatic mode by a voice coil or other pressure regulating device. The pneumatic input supply, manual pressure regulating means and voice coil all communicate at a common surface. The mode selecting means slides across this common surface to connect together the pneumatic input supply with one of the selected pressure regulating means.
    Type: Grant
    Filed: April 21, 1992
    Date of Patent: March 30, 1993
    Assignee: Johnson Service Company
    Inventor: Thomas O. Kautz