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7618391 |
Waveform sensing and regulating fluid flow valve
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...
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7267137 |
Deadweight pressure standards using non-hysteresis sylphons
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...
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6623248 |
System for conveying liquids without pulsing
A system tot the pulsation-free delivery of liquids, which system may be used for high-purity, liquid chemicals in the semiconductor industry.
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6415617 |
Model based economizer control of an air handling unit
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...
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6224356 |
Check valve stop and ports
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...
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6171066 |
Automatic pneumatic pressure control apparatus and method of controlling same
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...
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5873946 |
Installation and a process for lubricating, cleaning and/or disinfecting conveyor belts
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...
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5439021 |
Electro-pneumatic converter
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...
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5257639 |
Electropneumatic positioner
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...
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4953578 |
Dual mode pneumatic control system
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...
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4821760 |
Voice coil assembly for an electropneumatic converter
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...
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4804009 |
Pneumatic interface apparatus for control of process systems
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...
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4770200 |
Pneumatic interface apparatus
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...
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4760859 |
Modular pressure instrument
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...
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4715397 |
Pressure regulator
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)...
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4679583 |
Pneumatic control system, control means therefor and method of making the same
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...
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4665938 |
Frequency feedback on a current loop of a current-to-pressure converter
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...
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4616670 |
High-low pressure pilot
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...
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4611619 |
Air conserving restriction for use in pneumatic systems
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...
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4605033 |
Pneumatic converter having variable gain relay stack
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,...
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4554938 |
Device for converting electric signals into pneumatic signals
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)....
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4543975 |
Fluid pressure regulating valve mechanism
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...
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4534376 |
Electric signal to pressure signal transducer
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...
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4532951 |
Transducer utilizing electrical and pneumatic signals
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....
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4509403 |
Positioner having user-adjustable dynamic response
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...
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4428391 |
Circuit for pneumatic controllers
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...
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4421271 |
Zero energy band subbase for pneumatic thermostats
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...
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4336819 |
Pneumatic converter
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.
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4332269 |
Sloped nozzle pneumatic device
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...
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4314578 |
Fluid signal transmitting apparatus
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...
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4312475 |
Flow adjustment mechanism for air distributor systems
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...
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4285357 |
Pneumatic relay
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...
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4209030 |
Control device
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...
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4169485 |
Method of operating a control system
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...
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4153068 |
Pneumatic controller
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...
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4151856 |
Fluid pressure relay and output booster
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...
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4151953 |
Thermopneumatic actuator
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...
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4099539 |
Control system and control device therefor
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...
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4055197 |
Electro-proportional pressure control apparatus
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...
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4044651 |
Pneumatic function generator assembly
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...
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3994311 |
Pneumatic amplifier
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...
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3978876 |
Pneumatic pressure regulator
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...
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3935875 |
Pneumatically operated force balance transmitter and method of making the same
In a force balance transmitter having a base structure provided with passages therein and a secondary assembly attached thereto that includes a pneumatically operated relay module detachably...
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3929148 |
Differential and proportional pneumatic amplifiers
A differential and proportional pneumatic amplifier in which the input stage comprises a first chamber divided by a first membrane into a first compartment which is provided with a first pressure...
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3911939 |
Control valves
A pressure control valve for providing a fluid pressure which is a substantially fixed value higher than a control pressure comprises a valve member slidable in a cylinder, one end of the cylinder...
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3908685 |
Pneumatically operated control device and parts therefor or the like
A control device having a main lever pivotally mounted to a support that also carries a plurality of flexible diaphragms disposed in spaced aligned relation and parallel to the longitudinal axis of...
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3823726 |
PNEUMATIC CONTROL UNIT
A precision pneumatic proportional derivative or proportional integral derivative controller having a plurality of pistons each one of which forms a different portion of a balancing beam. Each...
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3823725 |
PNEUMATIC CONTROL APPARATUS
A pneumatic, proportional, integrating and differentiating control apparatus wherein a rate unit is interposed between the output of an automatic control unit and a negative feed-back circuit and...
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3812873 |
FLUID SIGNAL LIMITING DEVICE
A pneumatic signal limiter includes an integrated fluidic repeater and variable restrictor assembly having a pair of telescoping interconnected input and output body members with opposing and...
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3806027 |
MULTI PORT FLOW CONTROLLER
A controller for a volume regulator box in an air distribution system makes secondary use of control air. Secondary bleed nozzles are used in a way that eliminates the need for high pass and low...
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