supply and delivery of 150 mm dia c type ci alfa alfa valve top cover plate with threaded spindle for different rli schemes against raiganj a.m sub division sl no-1 supply and delivery of 150 mm dia c type ci alfa alfa valve top cover plate with threaded spindle for different rli schemes against raiganj a.m sub division. , ci item , cover plate with threaded spindle both in combined form for 150 mm dia c-type ci alfa alfa valve of i) cover plate of 273.1 mm dia, 10 mm thickness and p.c.d. 257 mm with hub (internal dia 20 mm and outer dia 45 mm), eight (08) nos. of hole ( 6 mm nominal bore for m6 nut & bolt) on top of the valve (each 45 degree apart) circumferentially spresd as per is 210/2009 with latest ammendments fitted for the 150 mm nominal bore c-type alfa alfa valve with another part of (ii) acme threaded spindle (angle between each tooth 29 degree) of spindle m20 of ms matchng with the other part of thread of the c-type 150 nominal bore alfa alfa valve as per drawing and as directed by eic.