constant flow valve Articles

  • Comparative analysis of modern control and AI–based control for maintaining constant ambient temperature

    The objective of this paper is to study various control techniques in order to maintain constant ambient temperature by controlling the position of gas solenoid valve and expansion valve that control the volume of gas flow to the burner and volume of cool air flow into the room. In order to control the room temperature conventional P, PI, PID, model reference control (MRC), fuzzy logic control ...


    By Inderscience Publishers

  • Dealing with Cavitation in Control Valves

    Cavitation consists of rapid vaporization and condensation within a liquid. When local pressure falls to vapor pressure (approximately 0.25 psi / 0.018 bar absolute for cold water), vapor bubbles are formed and when these bubbles travel to an area of higher pressure, the bubbles collapse with phenomenal force and great localized stress. It is the violent collapse of these vapor bubbles near valve ...


    By IWA Publishing

  • Basic operation of a Cycle Stop Valve

    Automatic pump control methods are described as a pump system that automatically delivers water when a tap is opened, and automatically stops the pump after all taps are closed. A variety of pump control methods have been used in the past. The Cycle Stop Valve replaces: Variable Frequency Drives (VFD’s) or “Constant Pressure Pumps”. Large pressure ...


    By Cycle Stop Valves, Inc.

  • Modeling overland flows in InfoWorks CS

    A new tool within InfoWorks CS v7.5 enables the presentation of flood depths within the bounds of a polygon, otherwise known as a flood compartment. The flood level can be extended throughout the boundaries of the compartment, allowing it to be matched against a ground model to calculate flood depth. The new tool does not alter the way in which flood calculations are undertaken, it is instead a ...


    By Innovyze

  • Exergy of natural gas flow in Iran's natural gas fields

    Natural gas flow has a valuable pressure exergy which is currently destroyed in throttling valves at exit of the gas fields. In the current study, this pressure exergy has been calculated for an actual case. Exergy analysis was based on actual condition of the Shanol gas field, which is situated in Iran, in the summer. It is assumed to be a good representative of Iran's whole gas fields. Exergy ...


    By Inderscience Publishers

  • Top 10 Valve Considerations for Pressure Management Zones/DMA’s

    For basic pressure management or more advanced modulating pressure management, water suppliers create a network of District Metered Areas (DMA’s) or smaller, more manageable pressure management zones. The DMA or pressure zone gives the ability to measure flow and control pressure, when a Pressure Reducing Valve (PRV) ...


    By Singer Valve Inc.

  • Standard quality valves available forcompressed gas and welding industry

    Small, medium or large scale industries all can be befitted with unique, innovative and premium quality valves provided by Evergreen Midwest Co. Other products includeregulators,fittings, adapters, cryogenic valves, transfer hoses and accessories. There are various kinds of valves available like the ammonia, CNG, Gate, chlorine valve, check packed, cylinder valves, ...


  • Cycle Stop Valve replaces four Variable Speed Pool Pumps case study

    This pool has 4 water features, a slide, a waterfall, a spa cascade, and a wet wall. I required the ability to run each of these water features independently. This pool also has four cleaning modes, two sets of in floor cleaning nozzles, skimming, filtering, and vacuuming. In addition this pool also has a 50 foot zero entry lip. In order to accommodate all the above a typical configuration would ...


    By Cycle Stop Valves, Inc.

  • South Australia’s $403 million NSISP Uses a “Super” Valve to Perform in a Variety of Extreme Conditions

    NSISP is one of South Australian Water Corporation’s (SA Water) biggest infrastructure projects undertaken in Adelaide metropolitan to connect the north and south drinking water distribution systems and to increase access to their desalination plant. The project included the construction of 32 km of pipeline through metropolitan main roads and suburban inner streets. This is no small feat ...


    By Singer Valve Inc.

  • The influence of ejector component efficiencies on performance of Ejector Expander Refrigeration Cycle and exergy analysis

    In order to identify the amounts and locations of irreversibility within the components of the cycle, exergy analysis is employed. A two-phase constant area ejector flow model was used. As the ejector component efficiencies increase, coefficient of performance and exergy efficiency increase. As a result, when the efficiencies of motive nozzle and diffuser are 100%, the efficiency of ejector ...


    By Inderscience Publishers

  • Water Tower bypass when under repair

    Bypassing a Water Tower When the time comes for repair on your elevated tank or hydro tank, Cycle Stop Valves can keep a “constant pressure” on the city while the tank or tower is out of service.  Attaching a Cycle Stop Valve to the discharge of a pump or enough pumps to keep up with the peak demands will insure that the system will also work at 3 ...


    By Cycle Stop Valves, Inc.

  • LIT25 level indicating transmitter controls swimming pool level

    The Town of Okotoks, Alberta I never gave it much thought, but what happens to the displaced water when a hundred people jump into a large public swimming pool? It goes into a surge tank - of course. This Greyline LIT25 Level Indicating Transmitter with ultrasonic sensor is installed in the basement of the Okotoks Recreation Centre in Alberta, Canada. The LIT's 4-20mA output is connected to a ...


    By Greyline Instruments Inc.

  • The Generation of Pure Water

    As a world leading manufacturer of complex multi-port stainless steel diaphragm valves, GEMÜ has earned an excellent reputation in the biotech and pharmaceuticals’ markets. GEMÜ is now transferring the skills acquired in biotech and pharmaceutical applications, to water applications by designing and manufacturing plastic multi-port block valves. The space saving compact build, ...


    By Modern Pumping Today

  • Energy savings: VFD versus CSV case study

    The two most common ways to produce constant pressure are Variable Frequency Drives or VFD’s, and Cycle Stop Valves or CSV’s. The end result is the same in that the system sees a steady or constant pressure, as the flow rates required vary from small to large. However, these two systems control the pump in completely different ways. Variable Frequency Drives or ...


    By Cycle Stop Valves, Inc.

  • Water Tower Booster

    CSV makes Water Tower Seem Taller A booster pump using a Cycle Stop Valve can take the 25 PSI coming from your too short water tower and boost pressure to the 50 PSI or more if needed. Follow the scenario below.  Example with supply coming from a well field:  ...


    By Cycle Stop Valves, Inc.

  • Deal With The Pressure - Protect piping system components with Pulsation Dampeners

    Metering pumps with operating pressures of up to 150 psig (pounds per square inch gauge) can create unwanted pressure pulsations within a piping system – a real problem in applications such as filling, mixing and spraying that require a combination of a metering pump’s accuracy and a continuous flow. But the issue can often be addressed with Pulsation Dampeners.The Pulsation Dampeners, usually ...


    By Lutz-JESCO America Corp.

  • Effective Removal of Zebra Mussels with Amiad Screen Technology

    Introduction The zebra mussel, native to the Black and Caspian Seas, has spread in the past few decades to waterways throughout the world mostly via ballast water. Zebra mussels, when non-indigenous to the environment, pose a serious threat to intakes of facilities that rely on fresh and brackish surface water. The mussel colonies obstruct the flow of water through the pipelines eventually ...

  • VFD for pumping systems

    Pumping systems account for nearly 20% of the world's electrical energy usage. In some process plants, the VFD for pumps and fans together account for between 50% and 80% of the total electricity used. Very rarely have I come across pumps operating with fully open discharge valves. The same is the case for fans with dampers. ...


    By Variable Frequency Drives

  • Typical process weighing applications

    Process weighing relates to the weighing of a powder material as part of a production process. The technology includes continually monitoring a material in a silo, discharging material by weight or rate, or even weighing products on the move. This article gives an overview of most of the typical process weighing applications that are used in all sorts of industries: level or inventory measuring ...


    By Hardy Process Solutions

  • InfoWorks WS - the best Calculation Engine

    Untitled Document ...


    By Innovyze

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