Metal Bellows Correctedn 7/11/00 6:40 PM Page 72
TORSIONAL STIFFNESS VALUES 30" TO 144" SIZE
VALUES ARE BASED ON:
1. Standard Convolution Height and Pitch
2. T-304 S/S Bellows Material
3. 800˚F Maximum Operating Condition
4. Data is Based Upon Single Bellows With Stated Convolution
Counts Only
SPRING RATES BELOW RESIST BELLOWS
MOVEMENT FOR TORSIONALLY APPLIED
MOMENT M
** Torsional Spring Rate (In. - Lb/Deg) X 10
6
for catalog parts
† Maximum Allowable Torsion Angle in Degrees
Nom.
50 PSIG 150 PSIG 300 PSIG
Nom.
50 PSIG
Nom.
25 PSIG
Nom.
25 PSIG
Dia. Dia. Dia.
# of Cons
Dia.
# of Cons
(In.)
# of Cons **
†
**
†
**
†
(In.)
# of Cons **
† (In.)
**
†
(In.) **
†
30 4 8.29 .019 14.5 .022 30.0 .021 44 4 25.6 .014 60 2 125 .008 108 2 726 .005
8 4.15 .039 7.25 .044 15.0 .043 8 12.8 .027 4 62.3 .017 4 363 .009
12 2.76 .058 4.84 .067 10.0 .064 12 8.55 .041 6 41.5 .025 6 242 .014
16 2.07 .078 3.63 .089 7.51 .086 16 6.41 .054 8 31.1 .033 8 182 .018
32 4 10.1 .018 17.3 .021 35.8 .020 46 4 29.3 .013 10 24.9 .041 10 145 .023
8 5.03 .036 8.65 .042 17.9 .041 8 14.7 .026 12 20.8 .050 12 121 .028
12 3.36 .055 5.77 .064 11.9 .061 12 9.77 .039 66 2 166 .008 120 2 996 .004
16 2.52 .073 4.32 .085 8.95 .082 16 7.33 .052 4 82.9 .015 4 498 .008
34 4 11.8 .017 20.7 .020 42.2 .020 48 4 33.3 .012 6 55.3 .023 6 332 .012
8 5.92 .035 10.4 .040 21.1 .039 8 16.6 .025 8 41.4 .030 8 249 .017
12 3.94 .052 6.92 .060 14.1 .059 12 11.1 .037 10 33.2 .038 10 199 .021
16 2.96 .070 5.19 .080 10.5 .079 16 8.32 .050 12 27.6 .045 12 166 .025
36 4 14.0 .017 24.6 .019 50.1 .019 50 2 72.1 .010 72 2 215 .007 132 2 1326 .004
8 7.02 .033 12.31 .038 25.0 .037 4 36.0 .020 4 108 .014 4 663 .008
12 4.68 .050 8.21 .057 16.7 .056 6 24.0 .030 6 71.7 .021 6 442 .011
16 3.51 .066 6.16 .075 12.5 .074 8 18.0 .040 8 53.8 .028 8 332 .015
38 4 16.5 .016 29.0 .018 58.9 .018 10 14.4 .050 10 43.0 .035 10 265 .019
8 8.26 .031 14.5 .036 29.4 .035 12 12.0 .060 12 35.9 .041 12 221 .023
12 5.51 .047 9.66 .054 19.6 .053 52 2 81.1 .010 84 2 342 .006 144 2 1722 .003
16 4.13 .063 7.24 .071 14.7 .070 4 40.5 .019 4 171 .012 4 861 .007
40 4 19.3 .015 33.8 .017 68.7 .017 6 27.0 .029 6 114 .018 6 574 .010
8 9.63 .030 16.9 .034 34.3 .033 8 20.3 .038 8 85.4 .024 8 430 .014
12 6.42 .045 11.3 .051 22.9 .050 10 16.2 .048 10 68.4 .030 10 344 .017
16 4.82 .059 8.45 .068 17.2 .067 12 13.5 .057 12 57.0 .035 12 287 .021
42 4 22.3 .014 39.1 .016 79.5 .016 54 2 90.8 .009 96 2 510 .005
8 11.15 .028 19.6 .032 39.8 .032 4 45.4 .018 4 255 .010
12 7.44 .042 13.0 .048 26.5 .048 6 30.3 .028 6 170 .016
16 5.58 .057 9.78 .065 19.9 .064 8 22.7 .037 8 128 .021
10 18.2 .046 10 102 .026
12 15.1 .055 12 85.0 .031
72
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