Double Flange Butterfly Valve 

1) Size: 2" - 40"
2) Class: 125lbs 150lbs

Technical standards:
1) Design and manufacture: API 6D
2) Face-to-face: DIN3202 F4(SHORT/MIDDLE/LONG BODY)SERIES 13
3) Flange end: PN10 PN16 ANSI B16.5

Main materials:
1) Body and disc: Brass, carbon steel, stainless steel, Hascrome
2) Stem: Stainless steel
3) Torsion spring: Stainless steel
4) Seal surface: Buna-n rubber, stainless steel, gathered four fluorine
Ethylene, and nylon plastics