Archive: Oct 2014

DFT Launches Intuitive, New Company Website

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DFT Inc. is proud to introduce you to our company’s new website! Though we have been a mainstay in the valve manufacturing industry for over seven decades, we always strive to provide more for our clients; with this redesigned website, you will experience DFT’s offerings in new, exciting ways.

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What You’ll Find on the Website

Our new website has abundant information for you to discover. The DFT site is now more fluent and responsive, with an attractive color scheme that quickly leads visitors to several helpful links, which include:

  • Check Valves – Our unique line of spring assisted check valves specialize in preventing common issues like water hammer and  reverse We offer threaded, flanged and wafer style valves in various custom sizes to suit your application.
  • Control Valves – The HI-100 offers a straight-thru design that promotes non-obstructed flow within a piping system. Our control valves come in different trim styles and sizes; these valves work well with liquids, slurries, and abrasive materials and can withstand high pressure drops.
  • Applications – If you’re unsure of which valve is right for your project, you can use this page to search by application and industry. For example: if you work in the gas compression industry and need a compressor discharge check, a PDC© flanged check valve will help. Keep in mind that our valves are quite versatile, so there’s more than one ideal valve for different applications.
  • Literature – Get the most in-depth info on our products, company certifications, data sheets, application guides, and much more. These resources have been crafted by our expert team to teach you more about our company and  its diverse products.
  • Blog – The DFT Blog has a wealth of articles on trending and relevant topics; our posts include topics such as common problems in check valve selection, the importance of accurate check valve sizing, how to solve air compressor problems, and more.
  • RFQ – Our Request for Quote page allows you to send any and all inquiries directly to our customer service representatives. We pride ourselves with the level of support we offer clients, and we respond quickly.

Visit DFT Valves Today

If you’re interested in learning more about how DFT Inc. can exceed your MRO and  project expectations, please visit our new site at www.dft-valves.com.

Using DFT Check Valve to Solve High Flow Lockout in Combustion Turbine

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There was a case study done at a power company regarding the installation of the check valve developed by DFT Inc. near the combustion turbine. The GLC Check Valve developed by DFT is connected on Low NOx Dual Fuel Turbines. The combustion turbines can run using diesel fuel or natural gas. When the turbine is fuelled by diesel, water is injected into the diesel in order to increase its power and lower the emission.

Detailed illustration of a gas turbine engine featuring components like compressor, combustion chamber, and burner.

A 3” 600# water injection line goes into the turbine. At the turbine, the line is further split into 20 – ¾” lines that are spread out equally around the turbine.

Natural Gas Dilemma

The turbines, as mentioned earlier, can also run using natural gas. However using natural gas requires that the power company must ask for permission from a local gas company in order to fuel the turbines. The problem when using natural gas is that the turbines consume so much that gas companies would need to run their compressor station at max capacity. Failure to do so might affect their downstream customers. When this scenario happens, the turbine combustion is forced to rely on diesel fuels.

A close-up of a pipe with a valve, allowing control of fluid flow

High Flow Lockout

Another problem that might occur is the High Flow Lockout. This happens when one of the 20 – ¾” check valves malfunctions, allowing air to go to the isolation valve, which in turn, causes the turbine to fail.

It is hard to pinpoint which of the 20 smaller valves have malfunctioned, requiring the operator to inspect each of the 20 valves individually.

The power company wants to remote start the turbine within 15 minutes of its cold start state. In this case, the only way for it to start quickly, is to utilize diesel fuel.

Solution with DFT Check Valves

The solution to all these problems is the installation of the DFT check valves. The 3” 600# 316SS GLC with soft, seat, sizing and a special spring, was installed on the water injection line near the turbine.

By doing so, the possibility of air backing up in the isolation valve is eliminated. The turbines can now work efficiently, whether using natural gas or diesel fuel.

The installation of the DFT check valves has been in the system for 6 years now, and no failure in the turbine has occurred. Word of the successful solution has spread to other plants resulting in the installation of DFT silent check valves.


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