Sealed and lined butterfly valves, from Keystone, specially designed to combine smooth flow and controllability, are being used on corrosive chemicals service.
The valve benefits from a one-piece disk/stem design covered with 3mm thick isostatically moulded PTFE. This provides good flow characteristics, while the PTFE seat extends over the seat face to provide a reliable seat-to-flange. This gas tight seal is good for environment applications.
Keystone Valves, Tel: 0141 8103121; Fax: 8104724.