Standards:API,BS,MSS,ASME,ASTM,GB Manufacturing Standards -Design:ASME B16.34 -Pressure-Temp.Rating:ASME B16.34 -Face to Face dimension:ASME B16.10 -Flanged Ends:ASMEB16.5(upto24") -Buff Weld ends:ASME B16.25 -Pressure Test:API 598 Manufacturing Range -Ratings:From 150 Lbs.up to 900 Lbs -Sizes:2"upto24" -Applicable Temperature:-64~560℃ Characteristics Description: Bolted bonnet OS&Y,lifting stem T type Body Back seat design Used for high-wearing,granules conditions Sealing surface welded Stellite or Tungsten carbide END:Flange conection(RF、FF、RTJ) Or Welded(SW) operation -Manual(handwheel or gearbox) -Actuated(Electric,pneumatic or hydraulic)