supply of spares for erv, safety valves and wall blowers for unit iv and v boiler , spares for super heater safety valve model no. 1740 md , disc , spares for erv model no: 1538 vx , disc , erv pilot valve disc with stem , erv pilot valve seat bushing , ‘c’ seal ring for erv main tag no. s 33 set pressure 162.5 , spares for drum safety valve model no: 1750 wb tag no. b1, b2, b11, design set pressure 181.1 kg / cm2 size 76.2 x 152.4 mm , disc 7005 , spares for wall blower model: wb - ie , gland packing for soot blower valve head , spiral wound (flange gasket) , spares for main steam stop valve , seat ring gasket (self sealing ring) 380 od x 330 id x 50 mm thick, soft iron, material 90 bhn hardness annealed