BTV2000 Long Pattern Wafer Style Butterfly Valve
When piping is supplied lined with heavy wall liners for vacuum resistance the bore of the pipe can be reduced sufficiently that if a butterfly valve is fitted the leading edge of the disc can interfere when opening with the bore of the piping. This has been over come in the past by fitting larger bore spacer rings each side of the valve to allow the disc to clear. These are considered and an additional leak path and add cost to the valve installation. Flowserve have developed a long pattern butterfly valve to overcome this problem, the extended body ensures that the disc opens without interfereing with the pipe liner.
The valves has a ductile iron body with PTFE body liner, with the disc being ductile iron encapsulated in PFA. With all wetted parts PTFE / PFA the valve can be used in highly corrosive applications and is ideally suit to our lined piping systems. All parts except the body and liner are interchangeble with the standard BTV2000) valve.
The valve has 3 separate stem seals preventing any fugitive emissions.
The PTFE body liner is machined from a single PTFE billet to maintain total integrity. Behind the PTFE liner a viton energiser acts on the PTFE body live loading the body seal against the PFA disc to give positive bubble tight shut off. Available in size range from 2” to 24”