 |
Torque Constants for Apollo® Top Entry Ball Valves**** |
| Seat Options |
Valve Size |
Differential Pressures (psig) |
| 100 |
285 |
500 |
740 |
1480 |
*1
2
3
5
6
*7
A
C
D
Z |
1/2 thru 1"
12.7 - 25.4mm |
85 |
110 |
140 |
180 |
290 |
1 - 1/2"
38.1mm |
205 |
260 |
330 |
415 |
660 |
2"
50.8mm |
350 |
430 |
550 |
735 |
1,200 |
3"
76.2mm |
950 |
1250 |
1,650 |
2,000 |
3,200 |
4"
101.6mm |
2,000 |
2,500 |
3,300 |
4,100 |
6,500 |
6"**
152.4mm** |
5,300 |
6,700 |
8,200 |
11,400 |
18,000 |
8"**
203.2mm** |
11,000 |
14,000 |
18,500 |
25,000 |
36,000 |
10"**
254.0mm** |
18,500 |
22,000 |
30,000 |
40,000 |
62,000 |
| Seat Options |
Valve Size |
Differential Pressures (psig) |
| 100 |
285 |
500 |
740 |
1480 |
4
8
***9
B |
1/2 thru 1"
12.7 - 25.4mm |
115 |
160 |
210 |
260 |
450 |
1 - 1/2"
38.1mm |
270 |
370 |
480 |
590 |
1,000 |
2"
50.8mm |
475 |
650 |
860 |
1,050 |
1,750 |
3"
76.2mm |
1,250 |
1,850 |
2,400 |
2,950 |
4,900 |
4"**
101.6mm |
2,700 |
3,700 |
4,900 |
5,900 |
10,000 |
6"**
152.4mm** |
7,410 |
10,100 |
13,400 |
16,400 |
25,300 |
8"**
203.2mm** |
15,000 |
20,000 |
26,000 |
34,500 |
56,000 |
10"**
254.0mm** |
25,000 |
32,000 |
45,000 |
60,000 |
96,000 |
* Reduce torque by 30% for PTFE seats
** Gear operator or actuation recommended
*** Increase torque by 10% for Ceramic seats
****For Full Port Figures, use one valve size larger
Torque Adjustment Factors |
| |
|
|
Provision |
Condition |
Additional Factor |
| |
|
|
Type of Operation |
ON/OFF Service |
0 |
|
Modulating |
0.25 |
|
|
|
Process Media |
Liquid, Clean Particle Free |
0 |
|
Liquid, Dirty, Slurry, Raw Water |
0.3 to 0.8 |
|
Liquid, Black Liquor, Lime Slurry |
0.8 |
|
Liquid, Oil, Lubricating |
-0.3 |
|
Liquid, Viscous, Molasses |
0.3 |
|
Gas, Clean & Wet, Saturated Steam |
0 |
|
Gas, Dry, Superheated Steam |
0.3 to 0.5 |
|
Gas, Dirty, Air Slurry, Natural Gas |
0.5 to 1 |
|
Oxygen, Chlorine |
0.5 |
|
|
|
Frequency of Operation |
Once per Day or More |
0 |
|
Once per Day to Once per Week |
0.2 |
|
Once per Week to Once per Month |
0.5 |
|
Once per Month or Less |
1 |
| |
|
|
| |
Example:
Selected Valve: 3" 150 w/#6 seat (Model: CS-C60-BO1)
|
Torque Constant: |
1250 in-lbs |
Service Factors: |
|
| ON/OFF Service |
0.0 |
| Clean Dry Air |
0.3 |
| Weekly Operation |
0.2 |
| Net Service Factor |
0.5 |
|
"In Service" Valve Torque: 1250 x (1 + 0.5) = 1875 in-lbs
This is the valve torque used to select an actuator.
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There are several elements involved in developing an appropriate "in-service" valve operating torque. Selection of the basic valve torque constant, shown at the left establishes the nominal valve torque based on the valve size, specified valve seat and the approximate working pressure.
Armed with the nominal valve operating torque, adjustments are now made to account for individual service conditions. These factors are selected from the table at the lower left. They are additive, or combined in series and used to arrive at the "in-service" torque.
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