1.Applications Designed for media with high viscidity such as crude oil and asphaltum 2.Structure Features Rotary metal bellows Good self balance performance Fork type torque driving In accordance with technical specification of API682 B 3.Operating Parameters Temperature: -75°C to +260°C (-100°F to +500°F) Pressure: Single: to 25bar Double-ply: to 40bar Speed: to 25m/s