A TYPE – DIAPHRAGM DIMENSIONS Diaphragm Identification Back Face Size
Grade identification Wetted Face
Week Year
Principal Diaphragm Dimensions
Size (DN)
A
B
8 10 15 20 25 32 40 50 65 80 100 125 150 200 250 300 350
35 43 33 40 46 60 65 78 95 114 -
28 35 37 44 54 67 70 83 102 127 194 222 273 381 438 508 527
D C (thickness) 9.5 3.2 10 4 13 5 13 5.4 5.5 7.2 1/4" BSW 6 6.2 7.9 5/16" BSW 7 8 3/8" BSW 11.1 11.9 10 14 7/8" BSW 15.2 15.9
Angles from the holes
E
d5
17.5 19 22 25.4 28.6 32 38 44.5 50 63.5 76
5 6 6 7 10 10 11 13 14 17 14 17 17 19 22
89
25
Number of Holes 2 2 4 4 4 4 4 4 4 4 4 8 8 10 14 14 14
α
β
γ
δ
40° 43°20' 35° 22°30' 22°30'
42° 43°20' 35° 22°30' 22°30'
56° 50° 40° 27° 22°30'
36° 45°
24°
24°
24°
36°
BSW=British Standard Whitworth thread Note: Dimensions in mm unless otherwise stated.
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