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Onyx Valve Series DAO
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Onyx Valve Series DAO


The Series DAO Full Round Port Mechanically Pinched Dual Pinch Valve is an economical, lightweight solution for on/off or throttling service in low to moderate pressure applications. Featuring a dual pinch mechanism and open frame design, this valve offers drop-tight closure and minimal pressure drop. The Series DAO is available in full round or pre-pinched construction, with fail open or fail closed pneumatic actuators to suit specific process requirements.

Onyx Valve Company manufactures each component of the Series DAO valve to the highest standards, utilizing advanced machining technology for precise tolerances. The company's expert engineering team ensures optimal actuator sizing based on valve size, fail mode, and process pressure. With its robust construction and reliable performance, the Series DAO is an ideal choice for a wide range of industrial applications.


  • Most economical mechanical design with open frame construction
  • Dual pinch mechanism provides drop-tight closure
  • Full round port allows for low pressure drop
  • Lightweight design for easy installation and maintenance
  • Available in fail open or fail closed pneumatic actuators
  • On/off or throttling service capabilities
  • Actuator sizing performed by Onyx Engineers for optimal performance


  • Low to moderate pressure fluid handling
  • On/off or throttling service in various industries
  • Ideal for applications requiring lightweight, economical pinch valves
  • Suitable for processes with low to moderate pressure drop requirements


  • Flanges: ANSI STD 125/150 lbs
  • Stem & Guide rods: 303 stainless steel
  • Options: Epoxy paint, sleeve elastomer, valve length, 316 stainless steel stem, positioners, solenoid valves, limit switches



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