Concentric Butterfly Valves sourcingAbout Concentric Butterfly Valves
Resilient-seated concentric butterfly valves in wafer, lug and flanged patterns, DN40 to DN1200, with EPDM, NBR or PTFE liners on cast and ductile iron bodies.
A concentric butterfly valve carries its disc on a shaft running through the centre of the pipe bore, closing against a resilient rubber liner that lines the full body. It is the standard isolation valve for water supply, HVAC, fire protection, sewage, seawater and general utility lines up to about PN 16 or PN 25, valued for its short face-to-face length, low weight and low cost per bore diameter. Indian manufacturers commonly supply wafer, lug and double-flanged bodies in cast iron and ductile iron with replaceable EPDM, NBR, Viton or food-grade liners, and discs in nylon-coated ductile iron, aluminium bronze, CF8M stainless or duplex for seawater duty. Industrial patterns follow API 609 Category A and EN 593; waterworks valves follow AWWA C504 or IS 13095, with seat testing to API 598. Lever operation is usual to about DN200 and gear operators above that, with ISO 5211 pads for actuation. An enquiry should state size, body pattern, flange standard and rating, liner and disc material, service medium and temperature, dead-end requirement, operator, quantity and inspection needs.
