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By certification 
REOWO This series is fluid pressure balanced type cage guided high performance Control Valve of large Cv value, and of excellent dynamic stability. It is suitable for heavy duty services. Only a small operation force can achieve stability control due to the balanced fluid pressure structure on plug. For those severe fluid conditions that cannot be covered by this series, please select Specs Valve multi stage type Control Valves.
Size: 1 1/2"~24"（DN40~DN600）
Pressure Rating: ASME CLASS 150~600 (PN16~PN100)
Body material: Carbon steel, Stainless steel, Alloy steel, Duplex stainless steel
Temperature Range:-196℃~230℃
Seat Leakage：ANSI Ⅳ(0.01%) or Ⅵ(bubble-tight)
Actuator Type:Pneumatic,Electric,Manual
Bonnet Type：Standard, Long-Extension,Bellows,Steam Jacket
Connection Type:Flange,Welding
http://www.reowovalve.com/
