1. Sample structure, small volume and light weight. 2. Easy to install and maintain. 3. Professional design, low flow resistance. 4. Apply to different flange standards installation. 5. A lubricating points, easy to maintain. 6. Valve core can be coated with anti_corrosion coating to meet the medium requirements. 7. Adapt to manual, mechanic operating, pneumatic, electric operating style. 8. Suitable for small size butterfly valve application from DN50_DN300 9. Ensure the O_rings, bushing, vulnerable parts to change regularly. 10. Extension rod or wrench to realize under shaft working.