Electrically actuated valve

A respirator used to replace or assist the respiratory function and automatically regulate the respiration gas flow and pressure during the inspiration phase and expiration phase comprising means for measuring the flow and pressure of respiration gas and providing electrical output signals, valve means...     

In a turbine powered generating system the rate of fuel flow for auxiliary firing of a steam turbine is automatically controlled to control the generation of steam for the turbine in accordance with turbine operating parameters and system power demands. Fuel flow rates are controlled within program selected...     

In a process for controlling a particle flow system which is to be operated at slightly above the velocity at which saltation occurs, a cross correlation technique is used to determine the spread of particle velocities in the system and this is compared with a signal representing the desired spread to...     

An electronically controlled, gravity-feed, intravenous infusion set in which a length of intravenous tubing is connected with a drip chamber to convey a fluid to be administered intravenously, the improvement comprising a normally closed internal valve in said set operable to prevent flow of fluid through...     

An electronically controlled intravenous infusion set of the gravity feed type having a flow path including a drip chamber and an internal valve for regulating flow through the set. Electromagnetic valve operating structure, positioned outside the IV set, controls the internal valve in response to an...     

A concentrating vortex shaker for the simultaneous shaking and concentration of a multiplicity of liquid samples comprises a heat-conductive block having a plurality of openings for receiving laboratory vessels containing sample liquids and removably mounted on a base provided with an adjustable eccentric...     

Pressure regulator system and apparatus for producing a controlled output pressure corresponding to a pre-programmed BCD set point command. Measured values of output fluid pressure emitted from the regulator is applied in BCD signal form to electronic logic in which the measured signal is compared with...     

A dual closed loop, precision pneumatic pressure selection, control and display system for use in testing pneumatic apparatus provides precision digital high response analog control of a precision pneumatic valve for establishing, maintaining, and displaying selected reference pressures and rates of...     

A high pressure fluid source is connected to a primary orifice and a valved orifice of a binarily activated pressure regulator. The primary orifice alone supplies the fluid at a pressure below the minimum desired, and both orifices together supply the fluid at a pressure greater than the maximum desired....     

A method and apparatus for parenteral administration of medical fluids has a normally closed clamp on the intraveneous feeding tube which is opened by means of an electromagnetic actuator at a preselected drop frequency rate and closed when a drop is detected by a conductive path established by the drop...     

In the disclosed system a motor axially displaces a screw-threaded movable valve member by rotating it within an interiorly threaded collar. A sensor detects the movable valve member's axial position. An electrical feed-back circuit compares the sensor output with a reference value and drives the motor...     

In order to obtain very close control of the flowrate of a fluid through a conduit against a predetermined desired flowrate, a pulse generator is employed to produce pulses at a frequency representing the desired flowrate, and a flowmeter issues similar pulses representing the actual flowrate. First...     

There is disclosed liquid flow control apparatus (particularly for use where the flow takes place in the form of drops over at least part of the flow path). A valve in the flow path is controlled by a servo system in dependence on the difference between desired and actual rate of flow signals. A linear...     

A gas flow control system has a variable metering device, a circuit for generating a first electrical signal which is a function of a desired gas flow through the metering device, a circuit for generating a second electrical signal which is a function of the gas pressure upstream of the metering device,...     

Improved magnetostrictive materials are combined in a novel arrangement to provide a transducer of the electromechanical type particularly suited for the precise control of fluid flow. An embodiment according to this invention comprises a valve assembly having a discharge ported, cylindrical housing...     

A valve of simplified construction, adapted to control fluid of high volume and pressure. The valve plunger is a hollow metal tube, that controls fluid flow by moving radial slots in its peripheral wall back and forth across a seal. The plunger is moved by an air or hydraulic cylinder which is connected...     

A digital valve has a valve body with an inlet passage and two outlet passages straddling the inlet passage. A plurality of slots are cut in the body connecting the inlet passage to each outlet passage. Bores in the valve body intersect each slot, and a plunger in each bore blocks or opens the slot....     

A safety device for sensing and monitoring pressure in oil or gas wellheads, flow lines, manifolds, pipelines, and the like, as well as other pressure vessels or apparatus requiring pressure sensing and monitoring, includes a pilot device having a transducer in operative communication with the source...     

Water supply line to the home has a water flow sensor therein and a valve therein. When water flow is sensed, the valve is turned off, as when a leak occurs. Such a leak may be caused by failure of a component in the system, such as a burst pipe or leaky hot water heater, or may be caused by a disaster...     

A diaphragm controlled pressure regulator has a control trim fluid pressure applied to the side of the diaphragm opposite to the side thereof in contact with the fluid, the pressure of which is to be regulated, whereby the normal regulator gain value of the regulator is substantially reduced so that...     

An upstream fluid chamber adapted for fluid flow in a given direction is interconnected to a downstream fluid chamber by a plurality of individually actuatable digital valve elements disposed in a plane substantially transverse to the given direction so that the pressure drop across each valve element...     

A control valve for a water sprinkler has a passage therethrough and a rotary member under the control of a stepping motor or equivalent rotatable to increase and decrease the area of the passage. A sensor detects the output pressure at the valve and at a predetermined pressure reverses the direction...     

A unit for inflating a vehicle tire is provided which functions to transmit air only if the tire contains at least a predetermined pressure. A signal is also provided which will function either to notify the user that air is being transmitted, or in the alternative, that air is not transmitted because...     

In a digital fluid flow control system having a source of fluid at a first pressure and a fluid receiver at a second pressure lower than the first pressure, individually actuatable, digital valve elements interconnect the source to the receiver. In the flow passage of each valve element, there is an...     

A sensing valve is provided in a water supply pipe upstream of a solenoid-closed valve. A sensing switch coupled to the sensing valve is controlled in position by such valve. A normally open timer switch is coupled to a timer and maintained open by the timer in accordance with the setting of the timer...     

A pressure regulator has at least one solenoid valve operated by electrical signals connected to a container the actual pressure of which is indicated by a pressure electric transducer. A comparator generates a regulation signal which is the difference between the actual pressure and a command pressure...     

In a feedback color control system for controlling the flows of two colorants used to color an article, a first error signal is generated as a function of deviations in the color saturation of the article from a desired saturation, and a second error signal is generated as a function of deviations in...     

A system for monitoring a low conductivity liquid carrying an electrostatic charge and flowing along a pipeline comprises two separately insulated conductive wall sections (M.sub.1, M.sub.3) of the pipeline one downstream of the other. Means are connected to each of these sections for providing a signal...     

A liquid drop rate controller for controlling flow of fluid from an infusion fluid reservoir to an intravenous infusion site which includes a cam means in the form of a wheel mounted eccentrically on a shaft which varies the compression on a flexible tube carrying the liquid; the controller senses the...     

A hydraulic system for precise positioning of a control device, such as a valve actuator. A double-acting, hydraulic cylinder, which operates the control device, is held in any set position by a hydraulic lock ensured by one-way check valves which prevent interflow between the chambers on opposite sides...     

The present invention relates to a current controlled pressure regulating apparatus for operating pneumatically operated elements such as valves in process control systems and the like. The apparatus is designed to provide for direct mechanical control of the pressure regulating apparatus in response...     

An electronic valve controller for controlling a meter valve system is disclosed. The electronic controller includes circuitry for enabling a multilevel shutdown of a meter valve system. The meter valve system includes a preset batch counter, positive displacement meter and diaphragm operated globe valve....     

A device for measuring the set pressure of a safety valve coupled to a pressure line, where the valve includes a springloaded closure element which is normally biased to close a port of the pressure line. The device includes a position transducer which generates a signal representative of the closure...     

In a digital fluid flow control system having a source of fluid at a first pressure and a fluid receiver at a second pressure lower than the first pressure, individually actuatable, digital valve elements interconnect the source to the receiver. In the flow passage of each valve element, there is an...     

An input valve having an input that can be coupled to a source of pressurized gas is open during first portions of successive cycles and closed during the remainder. A volume V is connected between the output of the valve and a load, and gas flows through the volume V to a load during the entire cycle....     

Method and apparatus for air conditioning control where multiple pressure conditions are added algebraically with independent modular diaphragm systems. The method provides automatic balance of pressure and velocity conditions by adjusting upstream dampers in response to the algebraic difference between...     

A hydraulic control system for use in machine tools, construction machines, hoists and the like, with a driven unit the hydraulic circuit of which is controlled by one or more electromagnetically positioned slide valves, and with an arrangement for automatically regulating the velocity of the hydraulic...     

The invention contemplates an electrically operated valve construction for control of fluid flow wherein an actuator module is adapted for detachable connection to a valve-body module which contains the valve member to be automatically positioned by a driver element of the actuator module. All electronic...     

A pilot actuated hydraulic control valve has a flow setting member in the form of a valve piston an end of which co-operates with radial outlet ports of the valve to form a variable metering orifice. A flow sensor provides a feedback differential pressure proportional to the flow through the valve and...     

An electronic controller is provided to control the energization of an electrical actuator to readjust a valve which controls the flow of a fluid in a controllable process. The controller is responsive to two signals, one of which is produced by a process sensor to represent the instantaneous magnitude...     

A regulating system for regulating the pressure in a fluid flow line particularly an L.P.G. supply line to the carburation system of an internal combustion engine comprises a regulating device connected in the flow line for varying the fluid flow rate along the line and an electro-fluid control loop...     

A flow controller having a volume, a pressure transducer coupled to said volume, a first valve coupled between a source of gas under pressure and said volume, a second valve coupled between said volume and a reference volume, a third valve coupled between said reference volume and a load wherein said...     

Where gas flows through distribution nozzles and then up through a liquid or a bed of particles contained in a processing vessel, the method and apparatus of this invention can be used to maintain a minimum average pressure drop across the nozzles, thus preventing the occurrence of inactive nozzles and...     

A hydraulic flow control valve is disclosed which is adapted for use as a pressure reducing valve, a flow control valve, or as a pressure relief valve. The valve includes a choke piston slidably mounted in a cylindrical bore for movement between a closed position closing communication between inlet and...     

An electrically controllable valve assembly for hydraulic adjustment of a piston includes a pilot valve controllable by an electronic controller. The pilot valve has a spool and a restrictor array comprising first and second variable restrictor means and a fixed restrictor means, through which flows...     

An apparatus capable of selecting and controlling the mass flow rate of a gas to be substantially constant over extended periods of time at very low flow rates and very low gas partial pressures is disclosed.

A pressure control valve arrangement includes a control slide valve body which is slidably accommodated in a central bore of a valve housing. The control slide valve body is acted upon at one of its axial sides by the controlled pressure, and at its other axial side by a tappet of a proportional electromagnet....     

A temperature compensation circuit is provided which can be used for span temperature compensation in an electropneumatic transducer system and which includes a constant current generator circuit coupled to a bridge of piezo resistances in a pressure transducer to supply a constant current through one...     

A process vessel which contains a control system for maintaining average pressure drop across gas discharge nozzles above a minimum valve to prevent the occurrence of inactive nozzles, said nozzles comprising part of a distributor which is used to distribute gas across the lower portion of the processing...     

A liquid filling machine has a plurality of discharge nozzles for simultaneously filling a plurality of containers. Each nozzle is connected to a manifold and has a restriction. A discreet pressure sensor is connected to each nozzle upstream from its restriction, and a solenoid valve is provided for...     

There is disclosed a system for automatically closing a gate valve of the type customarily installed in a sewer pipe system, the gate valve being positioned such as to divide the pipe into a forward exit section and a rear exit section, the system including fluid sensing means positioned in the forward...     

An air regulator system using air-piloted valves for controlling a plurality of different air flows in a powder spray system. A control regulator is used to set the flow rates of a plurality of flow regulators, each of which is associated with a particular air flow in the powder spray system.

A water supply system control (10) includes a microphonic circuit (34) which responds to audio signals and converts those signals into electrical signals which may be timed as chosen in order to control a solenoid-driven water valve assembly (14).

A mass flow controller is disclosed herein having a bridge with a pair of arms positioned in good heat transfer relation with a gas stream, the flow rate of which is to be controlled and energized by a constant current generator wherein a resistance difference due to differential cooling by the gas stream...     

An electrically-actuated fluid-flow control valve employed to establish and maintain prescribed flow conditions with the aid of a fast-response flowmeter is caused to operate swiftly, accurately and reliably by way of unique electrical circuitry which selectively enhances responses to low-level signals...     

A dual controller for an IV infusion system comprises a microprocessor to concurrently control the rate of infusion through two IV units. The control of the rate of infusion is provided by a stepper motor driven regulator which is selectively positionable for compressibly engaging the IV tubing. A flow...     

The present invention is directed to an apparatus and method for actuating a valve. The present invention is particularly useful with a valve for imparting pressure pulses in a pressure pulse telemetry system. The present invention relates to an apparatus and method for actuating a valve from a first...     

A fluid mass flow controller for maintaining the flow of a fluid at a predetermined rate despite fluctuations in inlet fluid pressure. The controller employs a sensor to measure the rate of flow of the fluid downstream from a control valve; negative feedback is generated from the sensor output and is...     

A valve body which is driven by a valve body-driving portion constructed from a piezoelectric stack to open and close a valve mouth. The piezoelectric stack consists of piezoelectric disc elements having a thickness of 0.1 to 0.5 mm and a diameter of 10 to 50 mm, whose upper surface and lower surface...     

The disclosed electrically controlled starter valve (10) regulates the flow of compressed gas to an air turbine starter (11) and precisely controls the way in which the flow is reduced after start of the aircraft engine. The electronic control system (30) is responsive to previously uncompensated for...     

The invention provides apparatus for detecting and then dealing with a leak in a plumbing system. Flow sensor means detect any unauthorized flow of water in the system and send a signal to a microprocessor control means. The control means then activates an alarm, isolates the leaking part of the system...     

A linear, closed-loop current-to-pressure transducer operating with a two-way solenoid valve. Outlet fluid pressure feedback is provided by an integral-circuit pressure sensor having a direct, sealed connection to a manifold to which the solenoid valve is also directly connected, the pressure sensor...     

A linear solenoid-type flow control valve with a valve element position feedback loop. An input consisting of an analog command signal is supplied in the form of a serial digital signal from a modulating transmitter through an optical fiber transmission line. An actuator operating driving circuit, a...     

To provide for uniform pressure, under predetermined conditions, of application of closure sealing jaws for a bag making machine, to close thermoplastic tubular foils, a hydraulic pressure element (7;26,28) applies the pressure of a pressure jaw (1) against another (2), with the foil interposed; the...     

This invention relates to a method and apparatus for a liquid mass flowmeter. The flowmeter apparatus gives correct flow regardless of changes in density, viscosity, or composition of the liquid and corrects flow in spite of errors common in currently used flowmeters, such as, calibration shifts, restricted...     

An apparatus and method control the pressure in a system by continuously measuring the pressure and comparing it to a desired set pressure. The apparatus and method record a history of the measured pressure as a function of time and calculate the rates at which the pressure changes. The rates at which...     

A pressure chamber through which the fuel in the fuel line passes, having a diaphragm moving to advanced position by the pressure in the chamber. A PE cell is arranged with light rays passing through the chamber and when the diaphragm is retracted it breaks the light rays and shuts off the circuit but...     

A fluid regulator including, in a housing, a nozzle flapper mechanism, a diaphragm displaceable by the nozzle back pressure of the nozzle flapper mechanism, a valve body for controlling fluid communication through a fluid passage in accordance with displacement of the diaphragm, and a sensor for picking...     

A two-way flow regulating valve with a hydraulic compensator (120) axially movable inside a cylindrical casing is intended to regulate the flow between an inlet opening an one or a plurality of discharge openings (10) radially arranged in the casing wall. A regulation valve (18) controls the position...     

A refrigerant recovery system which includes a compressor having an input coupled through an evaporator and through a solenoid valve to the refrigeration system from which refrigerant is to be withdrawn, and an output coupled through a condenser to a refrigerant storage container. The evaporator and...     

The invention is directed to a pressure reducer wherein the outlet pressure thereof is regulated by means of a comparison of the desired value with the actual value such that the adjusting range is expanded. This expansion of the adjusting range is obtained in that the adjustment of the biasing force...     

The invention is directed to a pressure reducer having an outlet pressure which is controllable via a desired value-actual value comparison. The desired value of the outlet pressure is selectable in a simple manner and can be maintained independently of changes of the through-flow or input pressure....     

A self-regulating pressure control valve, such as, for example, a self-regulated pressure reducing valve, including as the principal components, a pressure control valve, a pressure regulating unit, a driving unit for driving the pressure regulating unit, a control unit for controlling the operation...     

A mass flow controller includes a mass flow control unit connected to a mid portion of a conduit, the mass flow control unit having a by-pass and a mass flow sensor on the upstream side thereof and a flow regulating valve on the downstream side thereof. The mass flow sensor is communicated with the flow...     

A proportional electro-hydraulic pressure control valve incorporates a pressure sensor in its valve body and the hydraulic fluid pressure in a pressure detecting fluid path provided in the valve body is delivered as an electric signal output by the pressure sensor. The pressure detecting fluid path is...     

A system for controlling the operation of a plurality of dampers serving ventilation apertures in the structure of a building, which system comprises a plurality of actuators, one or more to be associated with each damper and to actuate the damper between an open and a closed position; the actuators...     

A flow control valve apparatus includes a housing including a main fluid passage having an inlet port and an outlet port; a main valve disposed between the inlet port and the outlet port for allowing or shutting off communication between the inlet port and the outlet port; a backpressure chamber formed...     

An open- or closed-loop control system is proposed, having at least one measuring transducer, an evaluation circuit connected with this transducer and at least one magnetic valve, which is incorporated in a hydraulic or pneumatic actuation system. The evaluation circuit and the electromagnet of the magnetic...     

A liquid dropping control device holds a bendable tube between a stationary klemmen and a movable klemmen, and adjusts a throttling amount of the tube by the movable klemmen, and comprises a means for detecting dropping of a liquid staying in a dropping tube, to be connected to said tube; a means for...     

An electrically controlled EGR valve comprising: a valve stem (64), eccentrically positioned from an axis of rotation and movable in a substantially axial manner relative to a valve seat (84); a poppet valve (70) carried by the valve stem for closing the valve seat (84); a first shaft (52) eccentrically...     

Shock absorber for vehicles, in which there is a damping element, which has a work cylinder holding a damping medium and divided into two work chambers by a piston, whereby at least partly to control the damping force, an electromagnetically activated and axially moving valve body of a valve pressurizes...     

An electropneumatic position regulator having a current/pressure transducer has, as electric input, at least one coil (11) fed with a current (setting signal), as well as a permanent magnet (16) whose relative position is variable as a function of the current for the adjustment of a nozzle/impact-plate...     

An automated gas measuring system comprises a constant pressure reactor system and a gas consumption monitoring system. A pressure drop in the reactor as a result of gas consumption is detected and the flow rate of gas to the reactor is adjusted to compensate for the pressure drop. Gas consumption is...     

A fluid flow stabilizer which includes two pluralities of stabilizer units adjacent one another. Each unit includes a plurality of parallel axially extending tubules. The units are movable into different relative positions so that certain of the tubules of a unit are aligned in fluid communication with...     

The invention provides a fluid pressure regulator with integrated sensor, including a single block (1), the fluid flow section combining the regulator and the sensor (12). In another block (2) integrally secured to the first, is provided a control system formed by a stepper motor (6) acting on the order...     

An electro-hydraulic servo-valve having a valve spool and comprising: an adjustment motor, and a control apparatus for adjusting said adjustment motor to depending on the input nominal value, wherein said adjustment motor transmits its movement directly to the valve spool of the hydraulic valve, and...     

A pressure control system for a storage tank, including a supply of working fluid under pressure. A conduit establishes fluid communication between the supply and the storage tank. A supply regulator is provided in the conduit for maintaining a substantially constant pressure to the storage tank. A tank...     

A fluid flow control apparatus including a fluid flow control valve, a fluid flow sensor, and a fluid flow control circuit receiving a signal from the fluid flow sensor and outputting a signal to the fluid flow control valve. The fluid flow control circuit including an actual control circuit which outputs...     

A fluid pressure regulator comprises a housing defining a cylindrical chamber, an inlet opening for introducing fluid under pressure into the chamber, an outlet opening for allowing fluid to leave the chamber at a regulated pressure, and a bleed orifice in communication with a space at constant pressure....     

An electropneumatic transducer for converting an electric signal to a pneumatic pressure has a nozzle flapper mechanism and a pilot valve engaging a diaphragm assembly. The nozzle flapper mechanism has a nozzle flapper composed of an electrostrictive element. The diaphragm assembly comprises two diaphragms...     

A current-to-pressure converter sets line pressure to a desired pressure indicated by the current. A circuit senses the line pressure and the current, receives compensation, and outputs a compensated difference between line and desired pressures. A first driver circuit provides actuator drive based on...     

Means are provided for monitoring water flow to a dwelling or the like and shutting off the flow if it exists for an abnormal period of time, the system being readily adjustable to adapt itself to different considerations of abnormality depending upon time of day, time of year, presence or absence of...     

A flow rate of gas is measured with a flow rate measurement means and a "consumption state" defined with a combination of maximum flow rate, the total amount and a consumption time of the gas is therefor detected. The consumption state is compared with a reference consumption condition which is represented...     

A compact and inexpensive apparatus for cooling and dispensing premixed beverages. The apparatus holds one or more conventional bottles of beverage, including carbonated as well as noncarbonated beverages, and chills these beverages for dispensing drinks from a tap. Pressure is maintained within the...     

A pipeline pressure control system for minimizing pressure surges within a pipeline includes a suction pressure controller connected to a suction pressure transmitter for sensing the pipeline pressure upstream of a valve and a discharge pressure controller connected to a discharge pressure transmitter...     

A pressure control assembly is disclosed. The assembly includes a pressure transducer for detecting upstream pressure. A diaphragm is used to regulate flow through the assembly, and is forced into a closed position by pressure from a fluid column. The pressure on the fluid column is controlled by a piston...     

A pressure relief valve is disclosed that includes a ball valve and an electrically powered valve operator for opening and closing the valve in response to electrical signals. A conduit connects a piezoelectric pressure gauge to upstream pressure. The gauge sends opening and closing electrical signals...     

A liquid or powder measurement apparatus, usable also for mixing a plurality of measured materials and for distributing the mixture to a plurality of dispensing containers. A flow control valve having a wide flow rate range and excellent linearity between the degree of valve opening and flow rate is...     

A mass flow controller including a valve assembly wherein a flow rate-controlling portion of the valve assembly is mirror finished and wherein the maximum flow rate through the flow rate-controlling portion during the time that the flow rate is not being controlled is set so as to be sufficiently large...     

A hydraulically actuated shut-off valve is controlled by a solenoid actuated control valve. A flow detection unit having a substantially vertical inlet and a substantially vertical flow passage has a substantially horizontal outlet connected to the horizontal inlet of the shut-off valve. A member movable...