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Onyx Valve Series GSF
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Onyx Valve Series GSF


The Series GSF is a full round port, air-compressed tube valve designed for maximum economy and inherently fail-open operation. This compact and lightweight valve features a clog-resistant full round opening, resulting in low pressure drop and drop-tight closure. The simple operation relies on a rubber sleeve as the only moving part, making it easy to maintain and reliable.

Ideal for controlling abrasive, viscous, and corrosive fluids, the Series GSF excels in applications involving wastewater, mine slurries, chemicals, cement, pulp stock, powder, and pellets. The valve's robust construction and innovative design make it a top choice for industries seeking efficient and dependable flow control solutions.


  • Full round port design allows for maximum flow and low pressure drop
  • Inherently fail-open operation ensures safety and reliability
  • Compact and lightweight construction facilitates installation and maintenance
  • Clog-resistant full round opening handles challenging fluids with ease
  • No packing required, reducing maintenance and downtime
  • Drop-tight closure provides excellent sealing performance
  • Simple operation with rubber sleeve as the only moving part, enhancing durability


  • Wastewater treatment plants
  • Mining and slurry handling
  • Chemical processing facilities
  • Cement production and distribution
  • Pulp and paper mills
  • Powder and pellet conveying systems


  • Flanges: ANSI STD B-16, 125 lbs
  • Housing: Cast Iron ASTM A48, Class 35
  • Epoxy paint for enhanced corrosion resistance
  • Various sleeve elastomers to suit specific application requirements
  • Bolt-on NEMA 4 solenoid valve with weatherproof coil and manual override
  • PRV (with solenoid valve) for precise pressure control
  • I/P transducer for modulating service



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