Lug Butterfly Valve — GGG40 with EPDM, NBR or FKM Seat up to DN600
The lug butterfly valve type AK201 is a lug type butterfly valve GGG40 with 150 µm epoxy coating and CF8M disc for industrial piping systems. The body is manufactured in ductile iron GGG40, while the disc consists of CF8M (1.4408). The shaft is AISI 420. The valve is available with EPDM, NBR or FPM/FKM (Viton) seat ring. Moreover, the lug butterfly valve DN600 covers nominal sizes DN50 to DN600 in pressure ratings PN10 and PN16 and mounts with threaded inserts between PN10/16 or ANSI Class 150 flanges. The lug design allows single-side pipe dismantling without affecting the opposite side. In addition, the face-to-face length follows EN 558 Series S20. The mounting flange conforms to ISO 5211 for lever, gearbox, pneumatic or electric actuator. Finally, the operating temperature range is −10 °C to +120 °C with EPDM, −10 °C to +80 °C with NBR and −15 °C to +160 °C with FPM/FKM. FERGO supplies the butterfly valve lug GGG40 DN600 ex stock.
Technical Data and Connection
The lug butterfly valve is available in nominal sizes DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300, DN350, DN400, DN450, DN500 and DN600. Pressure ratings cover PN10 and PN16. In addition, the lug body with threaded inserts mounts between mating flanges PN10, PN16 or ANSI Class 150. As a result, it allows single-side pipe dismantling. The face-to-face length to EN 558 Series S20 is the standardised short length for butterfly valves. Moreover, the butterfly valve EPDM PN16 lug comes with lever, gearbox, pneumatic actuator (single-acting or double-acting) or electric actuator. Finally, optional accessories include limit switch box, solenoid valve, positioner and stem extension.
Materials and Sealing
The body of the lug butterfly valve is manufactured in ductile iron GGG40 with 150 µm epoxy coating for high corrosion resistance. The disc in CF8M (1.4408) provides additional resistance against aggressive media. For the shaft, AISI 420 is used; this ensures high mechanical strength. The lug butterfly valve NBR with its NBR seat ring is suited for compressed air, oils and neutral media at temperatures from −10 °C to +80 °C. The EPDM seat ring version handles water, aqueous solutions and air from −10 °C to +120 °C. For chemically demanding applications and higher temperatures up to +160 °C, the FPM/FKM seat ring (Viton) is available. The concentric design with a centrally mounted disc ensures reliable tight shut-off. In addition, the ISO 5211 mounting flange allows direct attachment of different actuator types without adaptation.
Applications and Ordering
The lug butterfly valve protects pipelines in building services, HVAC systems, water supply networks and industrial process plants. For gases, liquids and solid-laden media, the lug type butterfly valve GGG40 is suitable. The lug design with threaded inserts allows single-side pipe dismantling and simplifies maintenance in existing pipelines. The choice of seat ring depends on medium and temperature — EPDM for water and air, NBR for oils and compressed air, FPM/FKM for chemicals and higher temperatures. For custom solutions, project quantities or technical advice, the FERGO team is available.
