Check Valves Articles

  • WaStop Access protects residents in Lewiston NY, USA - Case Study

    Location: Lewiston New York, USA Client: City of Lewiston Problem: The effect of combined sewers (combined wastewater and storm water) and an area prone to flooding from the Niagara River, a section of Upper Mountain Rd in Lewiston New York have experienced repeated flooded basements. On a visit with Jeffery Ritter of the City of Lewiston, Bob ...


    By Wapro AB

  • Treating wastewater as a resource

    A number of UK landfill operators are turning wastewater into a resource by utilising OTT monitoring and control systems to manage the irrigation of Willow crops (for renewable energy generation) with pre-treated effluent. Background Leachate from landfill sites represents a significant potential environmental liability, extending long into the future after a landfill site has ...

  • Hirschthal, Switzerland protected with WaStop DN1200 - Case Study

    Location: Hirschthal, Switzerland Problem: During times of high river levels, flooding occurred in the town of Hirschthal. This flooding occurred when the river level was higher than the stormwater outfall. This lead to river water pushing back up the outfall pipe, and spilling onto roads and residential areas. Solution: A DN1200 (NPS 48″) ...


    By Wapro AB

  • WaStop chosen to protect Forest View residents and property from flooding - Case Study

    Location: Forest View Customer: The Village of Forest View Problem: Originally Forest View had a combined sewer and stormwater system. As the area became popular development occurred which lead to more hard surface areas, which lead to higher runoff during rainy periods. This became such a problem that, in the 1960’s the sewer and ...


    By Wapro AB

  • Top 10 Reasons to Choose a Diaphragm Actuated Control Valve

    Every water system typically consists of piping networks that distribute water from a source or storage reservoir to the end users. This frequently requires miles of piping mains along with pumps systems and controls that all have to be monitored and controlled somehow. Whether this control is to regulate pressure, a level or a flow, this usually will require some form of a ...


    By Singer Valve Inc.

  • Top 8 things to check when maintaining a Pressure Reducing Valve

    Like every other piece of mechanical equipment we use, a control valve does require some maintenance. As budgets are stretched and time is tight, it can be tempting to ignore checking on valves that are often located in underground vaults and give years of operation without complaint, but eventually like everything else, they will fail. This article looks at 8 simple steps that if undertaken ...


    By Singer Valve Inc.

  • Aquantum Slides to Victory with Xylem

    When it comes to winter sports, some things are essential but nothing perhaps more so than snow and, in this instance, ice. As with many sports, conditions have to be right, with too many moisture and temperature fluctuations posing a real risk to the safety of athletes. For engineering company Aquantum, this was a primary concern for the bobsleigh track in Sochi, ...


    By LOWARA S.r.l.- a Xylem brand

  • Top 5 Causes for AODD Pump Failure

    1.       Air Valve Stalling, Clogging or Leaking: Stalling of the air valve often has to do with the design of the airways inside the valve. If the design in less than optimal it will stall under certain conditions. Same can be said about leakage of air where the air mostly blows through the valve instead of being redirected to push the diaphragm. Clogging on the other hand ...


  • Intensified ribbon blending of melamine compounds cuts cycle times 25% for furniture molder

    Melsur Corporation, the world's leading supplier of hard plastic melamine school furniture, molds components from a mixture of resin, wood flour and pigments. Each of the 32 color variations, 30 products and custom designs must be blended individually, a process that can take up to four hours, depending on product. Anything less than empirically defined cycle times alters the final color and ...

  • Valves - the Ideal and Cost effective Device for Efficient Fluid Control

    What are the Significances of Valves? A valve is a device responsible for handling the flow of fluid-like substances such as liquids, ...


  • Sound Refining, Inc. - a ROTAN® Pump Success Story

    Sound Refining, Inc. - a ROTAN® Pump Success Story Sound Refining Inc. of Tacoma, Washington provides bulk liquid storage and supplies fuels, lubricants, and other products and services to industry in the Pacific Northwest.  Plant Superintendent, Tom Beck is responsible for maintaining incoming and outgoing product schedules. Tom tells us, ...


    By DESMI A/S

  • How to maintain a VFD

    Many of the VFDs used by the water and wastewater industry are approaching 20 years old. With careful maintenance throughout this period, the drives will still be giving good service. But there comes a point in any drive's life cycle where the decision has to be taken: do you replace, upgrade or retrofit? But which is best and when is each relevant? This article explains the choices and the ...


    By VFD Manufacturers

  • Keeping Your Control Valves in Good Health

    Whether that brand new control valve in your system is the first one you have ever had to look after or if you are an old hand at valve maintenance with tens of valves in your system, there are a few simple guidelines and reminders for keeping it operating at optimal performance. It’s important to physically check valves at least every 12 weeks or so, assuming everything is running fine in ...


    By Singer Valve Inc.

  • Chemical metering pumps solve CP&L’s demineralization problem

    In order to solve a plugging problem in injection system of its coal-fired Lee plan in Goldsboro, NC, Carolina Power & Light Co. replaced the system with two chemical metering pumps. The two chemical metering pumps, made by Hydroflo Corp., have withstood continuous exposure to regenerating chemicals for almost ten years and have required minimal maintenance to the utility. Lee ...

  • Pumps’ chemical resistance, simple design help reduce downtime at trinity river water plant

    The Trinity River Authority’s Huntsville, Texas, Regional Water Supply System (HRWSS) provide six million gallons per day of portable water to 28,000 area residents. Each day, 330 gallons of alum are added to incoming river water to remove mud and suspended solids, along with 200 gallons of 50% caustic soda to raise the water’s pH level. In the past, the corrosive nature of the ...

  • Odour Control case study

    References from WaStop International´s own patented products. WaStop, WaBack and WaReg solves problems in a secure and efficient way. Odour on Carl Johann, Oslo - NORWAY Torg Street in Olso has had an ongoing and longstanding problem with sewage odors from the sewer drains. To stop this problem 52 WaStop DN 100 have been installed. These check valves now protect cable ...


    By WaStop International AB

  • Conversion of WaterMax models to InfoWorks WS

    Sydney Water contracted consultants GHD to convert its 149 existing Fire Flow WaterMax models to Wallingford Software’s InfoWorks WS solution, and upload the converted models onto Sydney Water Corporation’s Water Modeling System within a challenging three-month deadline. All water pipelines are sized for fire flow requirements, to ensure that sufficient pressures and flows can be achieved at any ...


    By Innovyze

  • Process Gass Venting

    Background:This Pfizer facility in Loughbeg manufactures proprietary active ingredients for strong prescription drugs which are then shipped to other facilities, predominantly Lipitor, for finishing. Remaining capacity is allocated to cancer drug manufacture. Most processes in the facility utilize a glass lined reactor vessel to produce large volumes of solvents such as ethyl chloride, acetone, ...


    By FAB-TECH Incorporated

  • Using GIS to Build Hydraulic Models Faster

    The use of hydraulic models, already widespread, continues to grow rapidly.  Modeling is used increasingly all around the world to address planning and operational issues in water supply networks, collection systems, and river management. Much of this growth results from the rapid advances in the capabilities of the best of the hydraulic modeling software solutions, which constantly improve ...


    By Innovyze

  • Whole Life Costs and pumping Technology – Peristaltics Increasingly Out on Top

    Untitled Document Whole life costs are playing an ever-more important role in pump selection by the water and wastewater industry. Interestingly, energy use is no longer the ...

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