tender for supplying of various diameter air valves and butterfly valves for routine maintenance at 160 mld salauli water treatment plant.- 1 supplying at store or site of work including railway freight, carting, loading, unloading, stacking etc. generally conforming to bs en 593, cone sphere eccentric design, double flanged butterfly valve having body, disc and end cover in graded cast iron to is:210 gr. fg 260, synthetic rubber face ring secured on disc by a ss retaining ring with stainless steel screws, the rubber ring seating on a corresponding integral model 60 / ss316 seat in body, stub shaft of aisi 431 riding in teflon bearings, flanges drilled to is:1538 table 4 & 6. type p.n. 1.6 (class a)dia in mmc) 150 2 supplying at store or site of work including railway freight, carting, loading, unloading, stacking etc. cast iron air valve kinetic double orifice type as per fig dk without isolating valve generally, confirming to is1 4845/2000 (with latest amendments).low pressure large orifice chamber with vulcanite coated timber ball resting on moulded rubber seating and chamber having c.i. cowl protection high pressure chamber shall have rubber coated timber ball as float, having float guides; and ltb or ss orifice nipple. all nuts /bolts shall be of carbon steel of ss. the flange shall be drilled and faced, as per is1538(part 4 and 6). type p.n. 1.6 (class a)d) 150 3 supplying at store or site of work including railway freight, carting, loading, unloading, stacking etc. cast iron air valve kinetic double orifice type as per fig dk without isolating valve generally, confirming to is1 4845/2000 (with latest amendments).low pressure large orifice chamber with vulcanite coated timber ball resting on moulded rubber seating and chamber having c.i. cowl protection high pressure chamber shall have rubber coated timber ball as float, having float guides; and ltb or ss orifice nipple. all nuts /bolts shall be of carbon steel of ss. the flange shall be drilled and faced, as per is1538(part 4 and 6). type p.n. 1.6 (class a)e)200 please enable macros to view boq information