QED Environmental Systems is the leading manufacturer of innovative environmental products.
For over 35 years their expertise has included Pumping Systems, Landfill Products, and Air Strippers.

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Is this Gate Valve Open or Closed?


There really is no correct answer to our quiz – by just looking at a gate valve you cannot tell if it’s open or closed. This often results in over-tightening, which strips the threads on the valve meaning it has to be replaced. But, unlike traditional gate valves, QED’s Precision Fine Tune™ Control Valve (U.S. Patent Number 8,800,597) has a highly visible metered scale that allows you to observe the valve setting, and quickly and accurately return to the exact flow setting after a shutdown. The rising stem valve exposes more of the metered scale as it is opened, allowing you to see and record numerically exactly how far the valve is open. This is a revolutionary breakthrough in landfill gas well field tuning, allowing you to easily and precisely adjust the gas flow from a well, rather than just turning the flow on or off. The Control Valve’s design gives you the ability to achieve linear flow adjustment across the entire range of valve movement. See the Control Valve Flow Curves.


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