Coliter ® Stainless Steel Hard Sealed Flange Butterfly Valve – PN0.6~4.0, -40~600°C, Triple Eccentric Metal Seal for High-Temp & Corrosive Media

D343W Stainless Steel Hard Sealed Flange Butterfly Valve – Triple Offset Design with Full Stainless Steel Construction for Zero Leakage in Demanding Applications

The Coliter® D343W Stainless Steel Hard Sealed Flange Butterfly Valve is a high-integrity industrial butterfly valve engineered for severe service in power plants, petrochemical, metallurgy, steam systems, and pipelines handling aggressive media such as acids, alkalis, salts, oil, gas, and high-temperature steam. Built entirely from corrosion-resistant materials—CF8/CF8M (304/316) stainless steel for the body and disc, 2Cr13 or 1Cr13 stainless steel for the stem, and a multi-layer stainless steel + high-temperature resistant asbestos composite seat ring—it ensures long-term durability under extreme conditions. The valve features a precision triple eccentric (three-offset) design: the shaft is offset vertically, horizontally, and angularly from the sealing plane, enabling the disc to disengage completely from the seat during rotation—eliminating friction, reducing wear, and allowing metal-to-metal sealing at temperatures up to 600℃. Rated for pressures from PN0.6 to PN4.0 (0.6–4.0 MPa), it undergoes rigorous testing per GB/T 13927-92, achieving a leakage rate of ＜0.1×DN mm³/s (Class VI equivalent). Available in sizes from DN50 to DN2000, it includes standard flanged end connections compliant with GB/T 9113, HG/T 20592, or ANSI B16.1. Drive options include manual, worm gear, pneumatic, hydraulic, electric, or electro-hydraulic actuators. Ideal for fire-safe, zero-leakage applications where soft seals would degrade, the D343W delivers maintenance-free, high-cycle performance in the most demanding fluid control environments.