Vescoat lined wafer check valve is generally Crafted from cast materials ductile iron or wcb body with lining ptfe / pfa / fep. Disc ss304 with pfa lined / fep lined other features bubble tight full flow, Shut off efficient, Are replaceable maintenance free, Ptfe seat, Glandless design. Low torque manual lever operated A maximum of 100 mm / worm gear operated in 150 millimeters up to 300 mm for easy operation. The lining is securely locked into the deep machined groove slot into the PFA-coated swing check valve body as well disc also. This prevents liner to collapse or blow out under full vacuum/high pressure applications & high temperature. Technical specifications of ptfe lined wafer check valve 1 design standard bs en iso 17292 2004 bs 5351 2 testing standard bs en 12266, 1&2 2003 3 size range 50 mm to 200 mm 4 drilling asa #150 / din 2632/2633 / bs 10 table d, E or f / customer specified. 5 face to face ansi b 16. 10 / din 3202 / bs en 558, 1/2 6 lining thickness 3 to 5 mm 7 body / disc m. O. C. Ductile iron ggg40. 3 / astm a395, Cast steel astm a216 gr. Wcb, Astm a351 gr. Cf8 s. S. 304, Astm a351 gr. Cf8m s. S. 316 8 lining material options ptfe fep, Ptfe pfa, Pvdf, Polypropylene or pp, Hdpe. 9 dimensions as per bs en 558, 2 table, 6, Series 3. 10 test and inspection hydraulic test body shell 20 kg/cm, Hydraulic test seat 11 kg/cm2, Pneumatic test seat 6 kg/cm2 11 spark test 15 k. V. D. C. 12 operation gear box, Pneumatic actuator, Electro, Pneumatic valve positioner, Pneumatic