Krombach® Metal Seated Ball Valves

 

Operating Torques


Krombach Metal Seated Ball Valves
Floating Ball Design
Trunnion Mounted Ball Design

Floating Ball Design


Differential Pressure

Floating Ball Design Max Oper torq


Expecting break away torque depends on differential pressure, medium and cycle frequency. It can be determined as follows:

Differential pressure x safety factor x cycle frequency factor.

Safety factor
Media Safety factor
Pure Oil 1,0
Thermal Oil 1,3
Other HC-fluids 1,5
Water 1,5
Suspension, Slurry 2,6
Steam, Vapour 2,6
Gas 2,6
Solid particles 3,0

Cycle frequency factor
If a valve will be stroked once per Cycle frequency factor
Day or more 1, 5
Week or more 1, 8
Month or more 1,30
Every four month 1,41
Every eight month 1,45

Maximum Operating Torque vs. Operating Torque of Stem: A453 Gr. 660 (eg. 1.4980)
Valve port size, full bore up to 70 deg. F up to 220 deg. F up to 400 deg. F upto 580 deg. F up to 750 deg. F
mm inch Nm ft Ib(f) Nm ft Ib(f) Nm ft Ib(f) Nm ft Ib(f) Nm ft Ib(f)
15 1/2 81 60 69 51 63 46 57 42 54 40
20 3/4 81 60 69 51 63 46 57 42 54 40
25 1 140 103 117 86 105 77 93 69 86 63
32 1 1/4 450 332 378 279 340 250 300 221 83 209
40 1 1/2 450 332 378 279 340 250 300 221 83 209
50 2 450 332 378 279 340 250 300 221 83 209
65 2 1/2 1420 1074 1375 1014 1235 911 1085 800 1025 756
80 3 1420 1074 1375 1014 1235 911 1085 800 1025 756
100 4 2260 1667 1870 1379 1680 1239 1490 1099 1375 1014
150 6 5900 4352 5650 4167 5075 3743 4500 3319 4215 3109
200 8 12200 8998 10120 7464 9000 6638 8000 5900 7570 5510
250 10 14000 10320 11500 8480 10800 7960 9300 6850 8500 6270
300 12 40000 29500 32500 23970 30000 22120 26000 19170 24000 17700
350 14 40000 29500 32500 23970 30000 22120 26000 19170 24000 17700
400 16 40000 29500 32500 23970 30000 22120 26000 19170 24000 17700
Selection Guide for Floating Versus Trunnion Ball Design


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Trunnion Mounted Ball Design


Differential Pressure

Trunnion Mounted Ball Design Oper Torq


Break-away torque is determined by differential pressure, medium, and stroke frequency. It can be determined as follows:

Differential pressure x safety factor x cycle frequency factor

Medium Factor
Media Safety factor
Pure Oil 1,0
Thermal Oil 1,3
Other HC-fluids 1,5
Water 1,5
Suspension, Slurry 2,6
Steam, Vapours 2,6
Gas 2,6
Solid particles 3,0

Stroke frequency factor
If a valve will be stroked once per Cycle frequency factor
Day or more 1, 25
Week or more 1, 28
Month or more 1,30
Four months 1,41
Eight months 1,45

Maximum Operating Torque vs. Operating Torque of Stem: A182 Gr. 316Ti
Size full bore Class
150 300 600 900 1500 2500 *Temp.
Nm ftlb Nm ftlb Nm ftlb Nm ftlb Nm ftlb Nm ftlb °C/°F
100
On request 3510 2589 3510 2589 6060 4469 6060 4469 20/68
2950 2176 2950 2176 5100 3761 5100 3761 100/212
2660 1962 2660 1962 4600 3393 4600 3393 200/392
2310 1704 2310 1704 4000 2950 4000 2950 300/572
150
6060 4469 6060 4469 11850 8739 14370 10598 20/68
5100 3761 5100 3761 9960 7346 12080 8909 100/212
4600 3393 4600 3393 8990 6630 10910 8046 200/392
4000 2950 4000 2950 7810 5760 9470 6984 300/572
200
6060 4469 6060 4469 9630 7102 9630 7102 37370 27560 48520 35784 20/68
5100 3761 5100 3761 8100 5974 8100 5974 31430 23180 40800 30090 100/212
4600 3393 4600 3393 7310 5391 7310 5391 28370 20923 36830 27162 200/392
4000 2950 4000 2950 6350 4683 6350 4683 24630 18165 31980 23585 300/572
250
10î
14370 10598 14370 10598 14370 10598 14370 10598 48520 35784 94770 69893 20/68
12080 8909 12080 8909 10280 8909 12080 8909 40800 30090 79690 58771 100/212
10910 8046 10910 8046 10910 8046 10910 8046 36830 27162 71930 53048 200/392
9470 6984 9470 6984 9470 6984 9470 6984 31980 23585 62460 46064 300/572
300
12î
28100 20724 28100 20724 28100 20724 28100 20724 48520 35784 163750 120766 20/68
23600 17405 23600 17405 23600 17405 23600 17405 40800 30090 137700 101554 100/212
21300 15709 21300 15709 21300 15709 21300 15709 36830 27162 124300 91671 200/392
18500 13644 18500 13644 18500 13644 18500 13644 31980 23585 107930 79598 300/572
350
14î
28100 20724 28100 20724 28100 20724 48520 35784 61690 45496 On request 20/68
23600 17405 23600 17405 23600 17405 40800 30090 51870 38254 100/212
21300 15709 21300 15709 21300 15709 36830 27162 46830 34537 200/392
18500 13644 18500 13644 18500 13644 31980 23585 40660 29987 300/572
400
16î
28100 20724 28100 20724 28100 20724 48520 35784 94770 69893 20/68
23600 17405 23600 17405 32600 17405 40800 30090 79690 58771 100/212
21300 15709 21300 15709 21300 15709 36830 27162 71930 53048 200/292
18500 13644 18500 13644 18500 13644 31980 23585 62460 46064 300/572


* Atmospheric Temperature


Stem material conversion factor
ASTM DIN 20°C 68 deg. F 100°C 212 deg. F 200°C 392 deg. F 300°C 572 deg. F
A18 Gr.316Ti 1.4571 1 1 1 1
A18 Gr.F51 1.446 2 2 2 2
A 86 Gr.660 1.498 2,7 3,1 3,3 3,7

Operating torques of stem made of A453 Gr. 660 (eg. 1.4980)
Valve port size, full bore up to 70 deg. F up to 220 deg. F up to 400 deg. F up to 580 deg. F up to 750 deg. F
mm inch Nm ftIb(f) Nm ftIb(f) Nm ftIb(f) Nm ftIb(f) Nm ftIb(f)
15 1/2 81 60 69 51 63 46 57 42 54 40
20 3/4 81 60 69 51 63 46 57 42 54 40
25 1 140 103 117 86 105 77 93 42 86 63
32 1 1/4 450 332 378 279 340 250 300 221 283 209
40 1 1/2 450 332 378 279 340 250 300 221 283 209
50 2 450 332 378 279 340 250 300 221 283 209
65 2 1/2 1420 1074 1375 1014 1235 911 1085 800 1025 756
80 3 1420 1074 1375 1014 1235 911 1085 800 1025 756
100 4 2260 1667 1870 1379 1680 1239 1490 1099 1375 1014
150 6 5900 4352 5650 4167 5075 3743 4500 3319 4215 3109
200 8 12200 8998 10120 7464 9000 6638 8000 5900 7570 5510
250 10 14000 10320 11500 8480 10800 7960 9300 6850 8500 6270
300 12 40000 29500 32500 23970 30000 22120 26000 19170 24000 17700
350 14 40000 29500 32500 23970 30000 22120 26000 19170 24000 17700
400 16 40000 29500 32500 23970 30000 22120 26000 19170 24000 17700


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