PTFE Butterfly Valve PTFE Butterfly Valve Technical Parameter1)Nominal Diameter: DN40-DN1502)Design standard: GB/T ... need for flange gasket, the way of edge-boot seat with valve body makes field replacement simple and fast.Material of construction ... SteelSeat: NBR, EPDM, Heat Resistant EPDM, VITON,Pin: Stainless SteelBushing: PTFE, BronzeRing: NBR, EPDM, VITON DNSizeΦDΦD2ΦD1ΦdNHAF05406535.550843 ...