Data Sheet

GX Control Valve and Actuator
D103171X012
Product Bulletin
51.1:GX
March 2012
19
Cycle Life
Bellows service life is affected by several factors, including process pressure, temperature, and plug travel. Tables 16,
17, 18, and 19 provide estimates of cycle life for several cases.
Table16.EstimatedBellowsCycleLifeat10.3bar(150psig)and20_C(68_F)
VALVE SIZE STEM SIZE BELLOWS MATERIAL PLYS BELLOWS PRESSURE
PROCESS
TEMPERATURE
ESTIMATED CYCLE LIFE
(50% Stroke [25-75% travel])
_C _F
DN15-50
(NPS 1/2 to 2)
10mm
1.4571 (316Ti) 2
10.3 bar
(150 psig)
20 68 1,040,000
N10276 3
10.3 bar
(150 psig)
20 68 910,000
DN80-100
(NPS 3 to 4)
14mm
1.4571 (316Ti) 2
10.3 bar
(150 psig)
20 68 1,020,000
N10276 2
10.3 bar
(150 psig)
20 68 980,000
Table 17. Estimated Bellows Cycle Life at Bellows Maximum Allowable Pressure and 20_C(68_F)
VALVE SIZE STEM SIZE BELLOWS MATERIAL PLYS
MAXIMUM
ALLOWABLE
BELLOWS
PRESSURE
(1)
PROCESS
TEMPERATURE
ESTIMATED CYCLE LIFE
(50% Stroke [25-75% travel])
_C _F
DN15-50
(NPS 1/2 to 2)
10mm
1.4571 (316Ti) 2
40 bar
(580 psig)
20 68 830,000
N10276 3
51.7 bar
(750 psig)
20 68 800,000
DN80-100
(NPS 3 to 4)
14mm
1.4571 (316Ti) 2
45 bar
(650 psig)
20 68 800,000
N10276 2
51.7 bar
(750 psig)
20 68 810,000
1. Valve maximum allowable pressure drop may be limited by size and material. See GX bulletin 51.1:GX(S1) for additional information.
Table 18. Estimated Bellows Cycle Life at Bellows Maximum Allowable Pressure and 232_C(450_F)
VALVE SIZE STEM SIZE BELLOWS MATERIAL PLYS
MAXIMUM
ALLOWABLE
BELLOWS
PRESSURE
(1)
PROCESS
TEMPERATURE
ESTIMATED CYCLE LIFE
(50% Stroke [25-75% travel])
_C _F
DN15-50
(NPS 1/2 to 2)
10mm
1.4571 (316Ti) 2
29.8 bar
(430 psig)
232 450 410,000
N10276 3
47.2 bar
(685 psig)
232 450 560,000
DN80-100
(NPS 3 to 4)
14mm
1.4571 (316Ti) 2
33.5 bar
(485 psig)
232 450 390,000
N10276 2
47.2 bar
(685 psig)
232 450 550,000
1. Valve maximum allowable pressure drop may be limited by size and material. See GX bulletin 51.1:GX(S1) for additional information.
Table 19. Estimated Bellows Cycle Life at Bellows Maximum Allowable Pressure and 371_C(700_F)
VALVE SIZE STEM SIZE BELLOWS MATERIAL PLYS
MAXIMUM
ALLOWABLE
BELLOWS PRESSURE
PROCESS
TEMPERATURE
ESTIMATED CYCLE LIFE
(50% Stroke [25-75% travel])
_C _F
DN15-50
(NPS 1/2 to 2)
10mm
1.4571 (316Ti) 2
26.1 bar
(380 psig)
371 700 250,000
N10276 3
39.3 bar
(570 psig)
371 700 430,000
DN80-100
(NPS 3 to 4)
14mm
1.4571 (316Ti) 2
29.3 bar
(425 psig)
371 700 240,000
N10276 2
39.3 bar
(570 psig)
371 700 430,000