rubber seal butterfly valve 1.Mechanic Sealing low friction moment 2.No scratching scars 3. ... StandardAPI 609End flangeEN1092 ,ANSI 125/150# ,DIN2501Face to faceEN 558-1, BS5155 , ISO 5752Top flangeISO 5211 BodyDuctile iron,Stainless steel,WCBDiscDuctile ... of GB, ASME, ANSI, API, BS, DIN, JIS etc. warious high quality DN 25 rubber seal butterfly valve