Specifications Part 1 - Water Supply, Sewerage and Tube Well Works

Table No.6.6Material for different component parts of reflux valves IS 5312 (Part-2)S.No. Component Basic Material Alternative Materialsi). Body with hinge anddiaphragmGrey cast iron a) S.G. ironb) Cast steelii). Hinge pin High tensile brass Stainless steeliii). Bolts Carbon steel ---------------iv). Nuts, nuts for hinge pins Carbon steel ---------------v). Bearing bushes Leaded tin bronze a) Austenitic ironb) PTFE/Rein- forcedPTFEvi). Face and seat rings Leaded tin bronze a) Austeniticstainless steelb) Stainless steelvii) Flange jointing material Rubber b)6.5.7 The dimensions of the valve shall be as under: table 6.7Table No.6.7 IS 5312 (Part-2)Size Length overFlange (A)Overall Height(B)Height of Centrefrom Duck Foot (C)500 815 1150 600600 914 1333 685700 1000 1446 750750 1045 1446 750800 1118 1634 850900 1250 1570 8151000 1250 1730 9156.5.8 Tolerances- The tolerance on the face-to-face dimensions shall be as follows:Table No.6.8Face-to-Face DimensionsTolerances400 mm ±2 mmAbove 400 mm up to and±3 mmincluding 600 mmAbove 600 mm up to and± 4 mmincluding 800 mmAbove 800 mm up to and± 5 mmincluding 1000 mm6.5.9 Mass of valve The minimum finished mass of the valves shall be as under: IS5312 (Part-2)Urban Administration & Development Department Page 72