The InterApp’s BIANCA Series butterfly valves are available with two standard trim options -316SS Disc and/or PFA coated 316SS Disc coupled with PTFE energised seats. These valves are used extensively in critical applications for acids transfer and tanker discharge isolation valves in the Chemical plants throughout Australia and in particular in Perth, Western Australia.
Additionally, there is an ULTRAFON option for extreme applications. Highly concentrated acids and aggressive gases diffuse through conventional PTFE liners and can attack or even destroy the back liners or the inside of the housing after only a short period of use. The rate of diffusion increases with rising temperature. The hardening of the back liner material can cause leaks around the shaft and result in a higher torque on the butterfly valve. Reduced operational safety is the result. Because of its more dense polymeric microstructure, the new ULTRAFLON® lining, which can be fitted optionally in the BIANCA butterfly valve, is effective in reducing the diffusion of concentrated acids and aggressive gases and guarantees the trouble-free functioning of the valve over a longer operating life.