Standards Design and Manufacture: API 609, MSS SP-67, MSS SP-68 AInspection and Test: API 598 End flange dimension: ASME B16.5(NPS≤ 24), ASME B16.47 B BW end dimension: ASME B16.25 Face to face and end to end: API 609 Pressure-temperature ratings: ASME B16.34 Trait and purpose Hard Seal Butterfly Valve triple offset series are our company's leading products, Which are used in such fields as metallurgy, light industry, electric power, petrochemistry, Coal gas channel etc. The Seal principle of hard Seal Butterfly Valve triple offset The Triple Offset Butterfly Valve Provides a bi-directional bubbletight shut-off. This geometry ensures that the disc seal contacts the body seat only at the final shut-off Position without rubbing or galling, providing atorque generated resilient seal with sufficient "wedging" to ensure auniform seal contact. Size Range: 1/2 Inch-24 Inch/DN15~DN3500 Class Range: 150LB-900LB/PN1.0~PN6.4 Construction: Body And Bonnet Available In Carbon Steel, In Alloy And Stainless Steel And Other Materials Available To Order End Connection: Flanged, Screwed, Socket Weld Or Butt Weld Offered Products: We can produce gate, globe, check, ball and butterfly valves with the materials of ductile iron, carbon steel, alloy steel, stainless steel, ultra-low carbon stainless steel, Monel and other materials available to order. Our products are designed and manufactured in accordance with the standards of GB, ASME, ANSI, API, BS, DIN, JIS etc. We can offer special standard valves to our clients on your request. Certificates: We have held the certificates of ISO, ISO 9001, SAI Global Watermark, ABS (Design Assessment Certificates), API 6D, CE/PED for many years and view the ISO 9001 as the minimum standard to maintain. Quality: A larger number of advanced mechanical facilities and inspecttion equipments have been employed in Shanghai Huatong Valve Co., Ltd. Based on the first-class management and advanced production facilities, we are confident to delivery the high quality valve products available to our customers.