... and chemical resistance b.High temperature resistance c. Excellent weather and water resistance Double Flange Butterfly Valve: SizeDN40 - DN1400Design ... StandardAPI 609End flangeEN1092 ,ANSI 125/150# ,DIN2501Face to faceEN 558-1, BS5155 , ISO ... ASME, ANSI, API, BS, DIN, JIS etc. various high quality Double Flange Butterfly valve