150/300/600/900lb API Triple eccentric Butterfly Valve
API triple eccentric butterfly valve features an advanced triple-offset design with metal-to-metal seating, delivering bubble-tight bi-directional sealing and zero leakage performance across 150LB to 900LB pressure classes. Manufactured to API 609 standards with fire-safe certification per API 607, this valve offers exceptional durability, low operating torque, and extended service life in demanding process environments.
Overview
Application : Widely used in oil & gas, petrochemical refineries, power plants and chemical processing where high temperatures, high pressures and corrosive media require reliable zero-leakage isolation. Also ideal for steam systems, thermal oil circuits, LNG facilities and pipeline transmission projects demanding fire-safe performance and bi-directional sealing capability. This valve is the preferred choice for critical shut-off applications in harsh industrial operating conditions.
Product features:
- Elastic property of composite metal sealing ring performs zero leakage.
- The torque seal ensures constant zero leakage characteristics of the valve.
- The design of right-angled rotation with zero friction is implemented by the distinctive triple eccentric principle; It eliminates the friction between the seat and sealing ring in 0° rotation.
- STL one-piece hard-surface seat may adapt to many working conditions, which is featured with long service life and easy maintenance.
- One-piece cast (three welded) body, face to face dimensions conforming to ISO 5752, ASME 16.10 and API 609, replacement of high performance butterfly valves and other types of valves, easy and flexible installation, intrinsically fireproof property thanks to all metal structure and tight performance.
- Anti-blowout stem design for high dependability, completely conformed to API 607.
- The valve position indicator on the stem and the flange mounted at the top are in favor of the indication of disc position.
- The stem of American standard triple eccentric butterfly valve is a shaft structure, stem and disc are connected by pin or pin-key combination.
Performance Standard:
Design standard | API 609-2016 | ||||
Flange size | ASME B 16.5-2013 ASME B 16.47-2011 | ||||
Test and inspection | API 598-2016 | ||||
Pressure-Temperature Rate | ASME B 16.34-2013 | ||||
Face to face dimension | API609-2016, ISO5752-1982 | ||||
Fire safe | API 607-2010 | ||||
Pressure rating | 150LB | 300LB | 600LB | 900LB | |
Test pressure at room temperature(Mpa) | Shell test | 2.93 | 7.58 | 16.0 | 20.9 |
High pressure seal test | 2.07 | 5.52 | 11.03 | 15.3 | |
Low pressure seal test | 0.6 | 0.6 | 0.6 | 0.6 | |
Applicable medium | Water, oil, gas and other causticity media (different media use different materials) | ||||
Applicable temperature | -100°C~800°C(Different raw material for different work temperature) | ||||
Drawing:

