Fully lined butterfly valves are offered by Sure Seal in the range of 2” to 24” with state-of-the-art mechanical shaft sealing technology. A unique molecular blend of PTFE and PFA (Protef), creating less creep, cold flow and permeability is used for the lining of the valves.
The PFA/Protef disc/ liner combination is very resistant against corrosion. The one piece disc stem has a 3 mm thick precision moulded PFA locked-in-liner, encapsulating the wetted surface of the 316 stainless steel core. This eliminates permeation and delamination. Viton elastomer backup rings are fitted to give a bubble tight shutt-off at minimum operating torque.
Fully lined ball valves with full port design are available in the range of 1” to 6”. Unique is the live loaded stem sealing with inverted gland flange. This enables direct mounting of an actuator and still being able to adjust the gland packing. The separately lined ball and stem allows the ball to float, hence avoiding leakage under high pressure situation. Both valves have blow out proof stem, anti-static design, can be operated at temperatures from -40 to +230 °C and are available in ANSI and DIN Standards.
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