A.     Specification: DN50-DN300 B.     Brief introduction to the product: BF serial resilient butterfly valve includes threaded connection and wafer type,and meets the strict requirements of HVAC equipment,irrigation,civil and industrial purposes.It is featured by that the valve plate is made of pin-less structure,which could effectively avoid the sticking of media at the center line of pipelines and the leakage at pin holes.The actuator could be handle,worm gear,electric and pneumatic. C. Pressure and temperature Working pressure:DN50-DN300                 150 -300PSI Temperature scope:NBR-26 ℃ -82 ℃                   EPDM-26 ℃ - 35 ℃ D. Materials    Valve body:Cast iron/ductile iron Valve disc:Ductile iron(nickel coated)/aluminum bronze/316 stainless steel Shaft:416/316 stainless steel Sealing seat:NBR/EPDM