Gerog Fischer Lugged Butterfly Valve 578 EPDM Seals
Keep fluid systems running reliably, even when the media flowing through them would destroy a standard metal valve. The Georg Fischer Lugged Butterfly Valve 578 combines a corrosion-resistant Polypropylene (PP) disc with a glass filled polypropylene (PP-GF30) housing, built to withstand chemically aggressive and high-purity processes without rusting or breaking down. That's why it's trusted across municipal water treatment plants, reverse osmosis systems, and seawater desalination facilities, where it safely regulates acids, alkalis, and other moderately aggressive chemicals compatible with PP and EPDM. Its EPDM rubber seals hold up well against water, steam, and mild chemicals (just keep petroleum-based oils away), while the glass fiber reinforced shell adds mechanical strength and resists UV damage and outdoor wear. The lugged body design is a real advantage for maintenance teams: it lets you install the valve at the very end of a pipeline and disconnect one side for servicing or expansion while the other stays pressurized, no need to shut down the whole system. This makes it just as valuable for large swimming pool construction, water parks, and aquatic life-support systems, where salt and chlorine chew through metal fittings in no time, as it is for cooling loops, surface engineering fluid lines, and demineralized water distribution. Rated PN10, this valve is engineered to deliver dependable flow control wherever traditional metal components fall short.

Summary: 

• Used for blocking, conveying, or regulating fluid flow within industrial and commercial piping networks
• Features a highly corrosion-resistant Polypropylene (PP) disc paired with a glass-filled polypropylene (PP-GF30) outer housing and EPDM rubber seals
• Engineered specifically to manage demanding, chemically aggressive, or high-purity fluid processes where traditional metal valves would rust or degrade
• Used extensively in municipal water treatment, reverse osmosis systems, seawater desalination plants, and industrial wastewater processing
• Safely regulates the flow of acids, alkalis, and moderately aggressive chemicals compatible with Polypropylene and EPDM
• Handles cooling loops, surface engineering fluid lines, and dematerialised water distribution
• Features threaded "lugs"
• Safely disconnect one side of the piping system for maintenance or expansion while the other side remains pressurised
• The outer shell is reinforced with glass fibre, giving it exceptional mechanical strength, UV stability, and external environmental resistance
• The internal seal is made of Ethylene Propylene Diene Monomer rubber, providing excellent resilience against water, steam, and mild chemicals, though it should be avoided with petroleum-based oils
• Rated PN10