117,448 research outputs found

    Combined pressure regulator and shutoff valve

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    A remotely operable pressure regulator and shutoff valve particularly suited for achieving high resolution and flow control, and positive shutoff is described. The valve is characterized by a spring-loaded ball coaxially aligned with a fluid port to be sealed, a spring-loaded pintle extended through the port into engagement with the ball, for controlling the position, a spring-loaded diaphragm for controlling the position of the pintle, and an axially displaceable spring supported by a movable stop which, in turn, is repositioned by a selectively operable stepper motor. Thus, the pressure-response characteristics for the valve can be varied through a selective repositioning of the stop

    Apparatus For Controlling Vehicles Moving Through A Conduit By Air

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    An apparatus for controlling vehicles which are moved through a conduit by air and includes a processing system positioned in the conduit for collecting, storage and dispatching the vehicles in which an air pump is positioned in parallel with the processing system having its suction connected to the conduit upstream of the system and its discharge connected to the conduit downstream of the system. Valve means are connected to the conduit for reducing the tendency of the vehicles in the processing system to move upstream towards the pump suction. The valve means alternates the pressure in a portion of the processing system between less than atmospheric and at least atmospheric. One form of the valve means may include an air blocking vehicle stop movable into and out of the conduit and a valve connected between the conduit and the atmosphere upstream of the vehicle stop which is open and closed in synchronism with the vehicle stop. In addition, a second valve may be connected between the conduit and the pump suction upstream of the air blocking vehicle stop for speeding up the vehicle processing. In another embodiment, first and second swingable flap valves may be positioned in the conduit in the upstream portion of the processing system with an air flow control connected to the pump suction and positioned for alternately withdrawing air from the conduit upstream of each of the first and second valves for allowing the vehicles to pass through the flap valves, but preventing the application of the pump suction to the conduit downstream of the second valve.Georgia Tech. Research Institut

    Gas-injection valve operates at high speed

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    Fast acting gas valve is used for injecting a short pulse of gas into a vacuum chamber during plasma acceleration experiments. It contains a lightweight closure disk that is forced away from the valve seat when an electromagnetic coil is momentarily energized and immediately rebounds from a stop back onto the seat

    Potable water dispenser

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    A dispenser particularly suited for use in dispensing potable water into food and beverage reconstitution bags is described. The dispenser is characterized by an expansible chamber, selectively adjustable stop means for varying the maximum dimensions, a rotary valve, and a linear valve coupled in a cooperating relation for delivering potable water to and from the chamber

    Analysis the effect of different type valve use at different pressure in piping system

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    This project was carried out as a study of flow rate using a single channel acoustic emission (AE) technique. The objective of this project is to study the effect of ball valve, brass gate valve and brass stop cock valve to flow rate using AE technique. A test rig consists of the circumferential galvanized steel pipe, ball valve, gate valve and stop cock valve to run the experiments. The fluid used was water throughout the experiments. The pressure of water was controlled by a valve. The source of AE signal was from the valve and it was captured using AE sensor with the help of Acoustic Emission Detector 2.1.3 software. For all valve conditions, the value of hits, count and RMS (average, maximum and minimum) were recorded and analyzed. All the value recorded were compared among the ball valve, gate valve and stop cock valve. The results were gained from 10 marked points each for all type of valve. The result showed that there was no AE activity on the pipe without valve, the AE activities are greater for high pressure or full close valve. In addition from the RMS against distance graft, RMS value increased when pressure is increased. From the flow rate against RMS graf show that flow rate will decrease when RMS is increased

    The Properties of Chromium Steel Overlaying Used as a Hardening Coating for Stop Valve Sealing Surface

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    AbstractOperational reliability of a pipeline valve depends on the durability of the weld sealing surfaces of the stop device, while the durability of the sealing surface is determined by the coating material properties. To enhance stop valve durability, a new composition for a flux-cored wire was developed, ensuring the generation of the surfacing metal with alloying system Cr-Ni-Mo-Mn-Si-Nb-Ti-B. Such wire provides overall hardening of the coating matrix with carboboride and intermetallic phases, providing an advanced operational reliability of stop valve nodes operating under friction conditions in aggressive environment

    Development of mathematical support of program algorithms for heating of stop valve on the main steam line of steam turbines development of software for a warm-up period, the main steam steam turbines

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    The reliable performance of the shut-off valve determines the operability of the entire power unit. The sequence of calculation and analysis of the thermally stressed state with allowance for ductility is given on the example of the stop valve of the steam turbine T-110 / 120-130 UTZ. The necessity of carrying out nonlinear calculations taking into account plasticity according to the bilinear deformation diagram for the stage of heating the stop valve during the start of the steam is proved. Two variants of calculations are fulfilled: constraints in the problem of the stress-strain state of the stop valve: in the first: restrictions are set on the movement of the internal surface of the channel for the valve stem and in the zone of welding of the drainage; In the second one, a hard seal on the cover of the stop valve is designed to simulate the deformation of the channel for moving the rod.Актуальное направление совершенствования технологии эксплуатации энергоблоков на ТЭС являются работы по полной или частичной автоматизации пуско – остановочных режимов теплотехнического оборудования. Для этого разрабатывается математическое обеспечение алгоритмов программ непрерывного управления параметрами пара и нагрузкой в переходных энергоблоков. Современные вычислительные устройства и комплексы средств компьютерного инженерного моделирования позволяют объединить локальные модели паропроводов с дренажами и байпасами, стопорных и регулирующих клапанов, корпусов цилиндра высокого давления в турбины в одной задаче термонапряженного состояния. При моделировании процесса на компьютере ограниченной мощности в реальном времени необходимы упрощения

    Peculiarities of simulation of thermo - stressed state of stop valve of steam turbine registration plasticity of material

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    The reliable performance of the shut-off valve determines the operability of the entire power unit. The sequence of calculation and analysis of the thermally stressed state with allowance for ductility is given on the example of the stop valve of the steam turbine T-110 / 120-130 UTZ. The necessity of carrying out nonlinear calculations taking into account plasticity according to the bilinear deformation diagram for the stage of heating the stop valve during the start of the steam is proved. Two variants of calculations are fulfilled: constraints in the problem of the stress-strain state of the stop valve: in the first: restrictions are set on the movement of the internal surface of the channel for the valve stem and in the zone of welding of the drainage; In the second one, a hard seal on the cover of the stop valve is designed to simulate the deformation of the channel for moving the rod.Надежная работоспособность стопорного клапана определяет работоспособность всего энергоблока. Приводится последовательность проведения расчетов и анализа термонапряженного состояния с учетом пластичности на примере стопорного клапана теплофикационной паровой турбины Т-110/120-130 УТЗ. Доказана необходимость проведения нелинейных расчетов с учетом пластичности по билинейно диаграмме деформирования для этапа прогрева стопорного клапана во время пуска паровой. Выполнено два варианта расчетов: ограничений в задаче напряженно-деформиванного состояния стопорного клапана: в первом: заданы ограничения по перемещению внутренней поверхности канала для штока клапана и в зоне приварки дренажа; во втором задана жесткая заделкой по крышке стопорного клапана для моделирования деформации канала для перемещения штока

    Intelligent Flow Control Valve

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    The present invention is an intelligent flow control valve which may be inserted into the flow coming out of a pipe and activated to provide a method to stop, measure, and meter flow coming from the open or possibly broken pipe. The intelligent flow control valve may be used to stop the flow while repairs are made. Once repairs have been made, the valve may be removed or used as a control valve to meter the amount of flow from inside the pipe. With the addition of instrumentation, the valve may also be used as a variable area flow meter and flow controller programmed based upon flowing conditions. With robotic additions, the valve may be configured to crawl into a desired pipe location, anchor itself, and activate flow control or metering remotely

    Fast acting check valve

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    A check valve which closes more rapidly to prevent wearing of the valve seat and of the valve member that seals thereagainst, including a solenoid or other actuator that aids the normal spring to quickly close the valve at approximately the time when downpath fluid flow would stop, the actuator then being deenergized. The control circuit that operates the actuator can include a pair of pressure sensors sensing pressure both upstream and downstream from the valve seat. Where the valve is utilized to control flow to or from a piston pump, energization of the actuator can be controlled by sensing when the pump piston reaches its extreme of travel
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