Nibco Butterfly Valve Wiring Diagram. The valve features an epdm encapsulated ductile iron disc. ¹⁄₂, 3, 4, 6, 8, 10 ** compliance with the. UL FM Approved Butterfly valves from ulfmvalve.com And approximately 75% of an equivalent size gate valve. By using this site, you agree to the use of these cookies. Ul listed and […]