Double & Triple Eccentric Butterfly Valves

Double Eccentric (Double Offset) and Triple Eccentric (Triple Offset) Butterfly Valves are high-performance valves engineered for critical applications where conventional rubber-seated valves cannot withstand high pressures, extreme temperatures, or abrasive media. By offsetting the shaft center from the valve center and the sealing cone axis, eccentric valves eliminate friction between disc and seat during 90-degree travel until the final point of shutoff.

Zeron Fastners manufactures API 609 Category B certified Double and Triple Offset Butterfly Valves featuring laminated metal/graphite seats or solid metal Stellite hardfacing. Engineered for bi-directional bubble-tight shutoff in saturated and superheated steam, oil refining, cryogenic LNG service, offshore production, and petrochemical processing. Available in Carbon Steel, SS 316, Duplex, and Inconel up to Class 600#.

Double & Triple Eccentric Butterfly Valves Suppliers Manufacturer India

Technical Specifications

Specification Feature Details & Standard Compliance
Design Standards API 609 Category B, ASME B16.34, BS EN 593, ISO 10631
Size Range 2" to 48" (DN50 - DN1200)
Pressure Ratings Class 150#, Class 300#, Class 600# (PN20 to PN100)
Offset Geometry Double Offset (High Performance) & Triple Offset (Frictionless Cone Geometry)
Seat Technologies Laminated SS 316 + Flexible Graphite, Solid Stellite Gr. 6, PTFE/RPTFE Soft Seat
Body Materials ASTM A216 WCB, A352 LCC, A351 CF8M, Duplex 2205, Inconel 625, Hastelloy C276
Body Styles Double Flanged, Lug Type, Wafer Pattern
Fire-Safe Certification API 607 / API 6FA Certified (Secondary Metal-to-Metal Seal)
Temperature Range -196°C (Cryogenic LNG) to +650°C (High-Temperature Steam)
Testing Standard API 598, ISO 5208 (Zero Leakage Rate A)

Offset Geometry & Benefits

Type & Model Key Features & Operating Applications
Double Offset (High Performance) Shaft offset from seat plane and pipe centerline; minimizes seat wear; ideal for hydrocarbons and steam.
Triple Offset (Zero Friction) Third offset cone angle eliminates camming friction entirely; delivers true metal-to-metal bubble-tight sealing.
Cryogenic Triple Offset Valves Extended bonnet column isolating gland packing from cryogenic LNG and liquid oxygen media.
Steam Isolation High Performance Replaces bulky gate valves on steam headers; lighter weight and lower maintenance.

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