overhauling job of hp and lp valves of unit 6 under t and a dept . stps , wbpdc overhauling job of hp and lp valves of unit 6 under t and a dept . stps , wbpdcl , overhauling job of hp & lp valves of unit #6 under t&a dept . stps , wbpdcl . , servicing of high pressure nrv ( non return valve ) , size 250nb . , servicing of bfp r / c valve , pneumatic actuating . , servicing of hp motorized valves , size: upto 25nb . , servicing of hp motorized valves , size: above 25 nb & upto 50 nb , servicing of hp motorized valves , size: above 50 nb & upto 100nb , servicing of hp motorized valves , size:above 200 nb & upto 300nb , servicing of manual gate valve , size:150nb , servicing of manual gate valve , size:200nb , servicing of manual gate valve , size: from 250nb upto 400nb , servicing of safety valve , size : from 150mm to 200mm , servicing of condenser inlet & outlet line butterfly valve with replacement of rubber seal ring , size:1800nb . , servicing of pneumatic control valve , size:150 nb to 200 nb , servicing actuators of different motorized valve