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ITT Engineered Dia-Flo Weir Diaphragm Valve
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ITT Engineered Dia-Flo Weir Diaphragm Valve


Dia-Flo weir-type diaphragm valves are engineered to handle challenging applications in industries such as chemical processing, mining, power generation, pulp and paper, and water treatment. These valves are specifically designed to manage corrosive, erosive, or solid-containing media that can cause clogging issues in other valve types.

The weir-style design of Dia-Flo diaphragm valves makes them an effective choice for control valve applications or situations requiring manual fluid throttling. With sizes ranging from 1/2" to 12" (DN15-300), temperature ratings from -30°F to 350°F (-34°C to 177°C), and pressure ratings from vacuum to 200 psi (1380 kPa), these valves offer versatile performance across a wide range of operating conditions.


  • Bubble tight shut-off across the weir, independent of line pressure
  • Bonnet isolation separates valve working components from process fluids
  • Packing-less design eliminates the need for gland adjustments and prevents stem seal leaks of hazardous media
  • In-line maintenance allows bonnet assembly removal without taking the valve out of the line
  • Streamlined fluid passage minimizes pockets or cavities where media can accumulate or become trapped


  • Chemical processing
  • Mining
  • Power generation
  • Pulp and paper
  • Water treatment


  • Sizes: 1/2-12" (DN15-300)
  • Temperature Rating: -30 - 350˚F (-34 - 177˚C)
  • Pressure Rating: Vacuum – 200 psi (1380 kPa)


Dia-Flo diaphragm valves are engineered for tough applications in the chemical processing, mining, power generation, pulp and paper, and water treatment industries.  Dia-Flo weir-type diaphragm valves are utilized to handle media which is corrosive, erosive, or contains solids which tend to clog other types of valves.  The weir-style diaphragm valve is used effectively as a control valve or where manual throttling of a fluid is desired.


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