Data Sheet

ENVIRO-SEAL Bellows Seal
D101641X012
Product Bulletin
59.1:070
December 2012
3
Cycle Life
Bellows seal service life is affected by several factors,
including pressure, temperature, and travel. T he cycle
life values listed in tables 1, 2, 3, and 4 are determined
from experimental data and reflect a 99% confidence
factor. These cycle life estimates do not include effects
from vibration in the piping system.
ENVIRO-SEAL bellows are normally sold with the travel
limited for optimum cycle life performance. Bellows
may be operated at full valve travel at reduced cycle
life.
Table 1. Estimated Cycle Life for N06625 Bellows
(1)
at 10.3 Bar (150 Psig) and 38_C (100_F)
VALVE SIZE, NPS BELLOWS SEAL TRAVEL
1/2, 3/4,
1, &
1-1/2
mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
3.6 0.14 4.6 0.19 6.4 0.28 9.7 0.38 14.2 0.56 19.1 0.75
1Ply 8,000,000 4,000,000 1,400,000 550,000 150,000 50,000
2Ply 10,000,000 10,000,000 2,300,000 800,000 160,000 50,000
2
mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
5.3 0.21 7.1 0.28 10.7 0.42 14.2 0.56 22.2 0.88 28.6 1.12
1Ply 8,000,000 4,000,000 1,400,000 550,000 150,000 50,000
2Ply 10,000,000 10,000,000 2,300,000 800,000 160,000 50,000
3
mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
6.4 0.28 9.5 0.38 26.0 0.56 19.1 0.75 28.6 1.12 38.1 1.50
1Ply 1,000,000 1,000,000 700,000 450,000 300,000 100,000
2Ply 10,000,000 10,000,000 5,000,000 2,500,000 1,000,000 350,000
4
mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
9.5 0.38 12.7 0.5 19.1 0.75 28.6 1.12 38.1 1.50 50.8 2.00
1Ply 1,000,000 700,000 450,000 300,000 100,000 50,000
2Ply 10,000,000 5,000,000 2,500,000 1,000,000 350,000 150,000
1. See the Cycle Life section in this bulletin for more information on bellows travel.
Table 2. Estimated Cycle Life for N06625 Bellows
(1)
at Maximum Pressure and 316_C(600_F)
VALVE SIZE, NPS BELLOWS SEAL TRAVEL
1/2, 3/4,
1, &
1-1/2
mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
3.6 0.14 4.6 0.19 6.4 0.28 9.7 0.38 14.2 0.56 19.1 0.75
1Ply 100,000 80,000 50,000 30,000 12,000 7,000
2Ply 100,000 90,000 50,000 30,000 12,000 7,000
2
mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
5.3 0.21 7.1 0.28 10.7 0.42 14.2 0.56 22.2 0.88 28.6 1.12
1Ply 100,000 80,000 50,000 30,000 12,000 7,000
2Ply 100,000 90,000 50,000 30,000 12,000 7,000
3
mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
6.4 0.28 9.5 0.38 26.0 0.56 19.1 0.75 28.6 1.12 38.1 1.50
1Ply 45,000 45,000 34,000 24,000 18,000 12,000
2Ply 50,000 50,000 41,000 34,000 24,000 12,000
4
mm Inch mm Inch mm Inch mm Inch mm Inch mm Inch
9.5 0.38 12.7 0.5 19.1 0.75 28.6 1.12 38.1 1.50 50.8 2.00
1Ply 45,000 34,000 24,000 18,000 12,000 7,000
2Ply 50,000 41,000 34,000 24,000 12,000 7,000
1. See the Cycle Life section in this bulletin for more information on bellows travel.