procurement of spares of air release valves ( size 200 nb ) installed on cw pumps discharge pipe line of 2x600mw , sstpp , mppgcl , dongalia , spares for cw pipe line air release valve of size: 200 nb , ball for h . p . chamber ( float ) part no . 21 moc: timber core with soft rubber coating , ball for l . p . chamber ( float ) part no . 20 moc: timber core with soft rubber coating , l . p . seat ring part no . 19 moc: dexine ( nitrile rubber ) , gasket part no . 24 moc: rubber , is:638 type-b , h . p orifice plug part no . 18 moc: stainless steel , aisi 304 , h . p orifice part no . 17 moc: stainless steel , aisi 304 , cowl part no . 12 moc: cast iron is 210-1991 , gr-fg260 , high pressure cover part no . 10 moc: cast iron is 210-1991 , gr-fg260 , low pressure cover part no . 09 moc: cast iron is 210-1991 , gr-fg260