supply of spares safety valves and soot blower in unit i, ii and iii boiler , supply of spares safety valves and soot blower in unit i,ii & iii boiler spares for erv model no: 1538vx- 10w , erv main seat bushing , spares for erv pilot valve model no:1538vx-10w , erv pilot valve disc with stem , pilot valve gasket , erv pilot disc guide - 7501 , c seal ring 7501 , spares for 1759 wb safety valve (b1) , disc holder - 7005 , upper adjustable ring - 7005 , spares for 1749 wb safety valve (b2 & b3) , spindle - 7001 , lower adjusting ring pin (7001) , lower adjustable ring (7001) , upper adjustable ring -(7001 , spares for superheater safety valve (1739 wd) , disc (7000) , disc holder (7000) , lower adjusting ring pin (7000) , upper adjusting ring pin (7000) , spares for water wall soot blower , gland packing for sbv head , spur gear for wall blower