Page 39 - Apollo - Top Entry Ball Valves

OPERATING TORQUE

There are several elements involved TORQUE CONSTANTS FOR TOP ENTRY BALL VALVES
in developing an appropriate Valve Size Valve Size Differential Pressures (psig) (In.-Lbs.)
“in-service” valve operating torque. Seats Std. Port Full Port Grafoil®
Selection of the basic valve (Inches) (Inches) 100 285 500 740 1480 LSST* Adder
torque constant, shown on this 5 1/2 thru 1 1/2 thru 3/4 85 110 140 180 290 170 68
page establishes the nominal 6** 1-1/2 1 205 260 330 415 660 410 96
C
430
735
550
700
valve torque based on the valve D 2 3 1-1/2 350 1,250 1,650 2,000 1,200 1,900 127
2
245
950
3,200
size, specified valve seat and the G 4 3 2,000 2,500 3,300 4,100 6,500 4,000 399
approximate working pressure. J L 6 †† 4 †† 5,300 6,700 8,200 11,400 18,000 10,600 661
M 8 †† 6 †† 11,000 14,000 18,500 25,000 36,000 22,000 900
Armed with the nominal valve U** 10 †† 8 †† 18,500 22,000 30,000 40,000 62,000 37,000 1,326
operating torque, adjustments are 1/2 thru 1 1/2 thru 3/4 115 160 210 260 450 230 68
now made to account for individual 4 1-1/2 1 270 370 480 590 1,000 540 96
service conditions. These factors 8 2 1-1/2 475 650 860 1,050 1,750 950 127
are selected from the table at the 9 3 2 1,250 1,850 2,400 2,950 4,900 2,500 245
lower right. They are additive, or B 4 †† †† 3 †† †† 2,700 3,700 4,900 5,900 10,000 5,400 399
7,410
combined in series and used to H N 6 8 †† 4 6 †† 15,000 10,100 13,400 16,400 25,300 14,800 661
20,000
30,000
900
56,000
26,000
34,500
arrive at the “in-service” torque. 10 †† 8 †† 25,000 32,000 45,000 60,000 96,000 50,000 1,326
*LSST - Long Stand Still Torque
EXAMPLE **Rated torque for #6 and U seat add 30%
†
Selected Valve: †† Rated torque for #9 ceramic seat is to be increased by 10%
Gear operator or actuation recommended
3” 150 w/”M” seat
(Model: CS-BM0-01)
Torque Constant: BALL VALVE TORQUE ADJUSTMENT FACTORS
1250 in-lbs
PROVISION CONDITION FACTOR
Service Factors: On/Off Service 0
ON/OFF Service 0.0 Type of Operation Modulating Service 0.25
Clean Dry Air 0.3 Liquid, Clean Particle Free 0
Weekly Operation 0.2 Liquid, Dirty, Slurry, Raw Water 0.3 to 0.8
Net Service Factor 0.5 Liquid, Black Liquor, Lime Slurry 0.8
0
Liquid, Oil, Lubricating
“In Service” Valve Torque: Process Media Liquid, Viscous, Molasses 0.3
0
1250 x (1 + 0.5) = 1875 in-lbs Gas, Clean & Wet 0.3 to 0.5
Gas, Dry
(This is the valve torque used to Gas, Dirty, Air Slurry, Natural Gas 0.5 to 1
select an actuator.)
Oxygen, Chlorine 0.5
Superheated Steam, Saturated Steam Refer to Process Temp.
Once Per Day or More 0
Once Per Week 0.2
Frequency of Operation**
Once Per Month 0.5
Less Than Once Per Month (LSST) 1
Applications Above 225 Deg F (107°C) 0.50
Process Temperature
Applications Below -20 Deg F (-29°C) 0.25
Option “-49” Assembled Dry 0.3
Option “-57” Oxygen Cleaned 0.3
Option “-67” Cleaned for Industrial Gas 0.3
Option “-90” Double Packed Extended Bonnet 0.2
Customer Specified Prescribed Safety Factor 0.2 to 2
** If accounting for LSST disregard frequency of operation.

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