Ball Valve Torque Chart

The ball valve torque chart contains basic information on determining the actued ball valve torques to be used for actuator selection. The torque values listed in the following tables are breakaway torques from the closed position.

Relia offers a valve actuation package fors, ball valves with pneumatic, electric and gas over oil operation.

Floating Ball Valve Torque Chart

Size	Torque value (N.m)
(inch)	Class 150	Class 300	Class 600	Class 900	Class 1500
1/2	12	17	30	38	51
3/4	14	23	38	56	130
1	27	48	66	98	238
1-1/2	55	89	120	189	350
2	75	100	160	240	550
2-1/2	125	141	233	390	980
3	162	216	308	610	...
4	234	476	635	...	...
5	546	910	...	...	...
6	804	1338	1944	...	...

Note:

All ball valves are in normal temperature with PTFE seat for Class 150 and Class 300 ball valves and Nylon seat for Class 600 ball valve, PEEK seat for Class 900 and Class 1500 ball valves.
Torque shown in this table is to be used as a guid for actuator selection, A safety factor of 1.5 times is recommended for sizing actuator.
Torque may be changed according to different medium and trim material.

Trunnion Ball Valve Torque Chart

Size	Torque value (N.m)
(inch)	Class 150	Class 300	Class 600	Class 900	Class 1500	Class 2500
1-1/2	40	50	80	130	240	290
2	50	70	120	180	250	380
3	60	100	240	400	530	780
4	100	210	500	670	900	1300
6	420	600	900	1820	2040	4850
8	700	1100	1500	2560	4790	6900
10	1100	1800	2750	4510	8230	13600
12	1600	2500	3600	6824	10340	23100
14	1950	3200	4700	8250	12123
16	2500	3500	5470	9940	14920
18	3400	5510	9000	14630	27230
20	4600	7500	11000	20000	32830
22	5200	9000	14630	25400	39420
24	6774	11150	17950	29900	46320
26	8000	13360	21640	34950	55430
28	8600	14200	24340	38780	70650
30	9223	16660	32510	46610	75000
32	11810	19500	37600	58230
34	13330	21380	41800	63750
36	14214	29375	47570	72600

Note:

The trunnion ball valve torque value is calculated based on normal temperature.
Torque shown in this table is to be used as a guide for actuator selection. A safety factor of 1.3~1.5 is recommended for actuator sizing.
Torque may be changed depending on fluids and trim materials.

Breakaway torques are determined by measured after the valve has been in the closed position under pressure for a set time period, and are the highest torques expected. The running torque is approximately 50%, or one-half, of the breakaway torque. The re-seat torque is approximately 75%, or three-quarters, of the breakaway torque.

BTO - Break To Open
RTO - Run To Open
ETO - End To Open
BTC - Break To Close
RTC - Run To Close
ETC - End To Close

pneumatic actuated ball valve

Relia Pneumatic Ball Valves

Factors Affecting The Torque Value

Seat Materials:

The ball seat materials used in a valve will significantly influence the operating torque. Softer, lower-friction seats (such as TFE or TFMTM) will have a lower torque than the harder, higher-friction materials such as Delrin or PEEK. Different tables have been provided where seat materials significantly affect operating torque.

Line Media:

What is flowing through the valve can have the most significant effect on valve operating torques. Fine solids, slurries, or very viscous fluids can have a great effect, not only on torque but also on valve service life. Media factors are also provided in the tables at the end of this bulletin.

Operation Frequency:

How the valve will be operated and how frequently it will be operated also affect actuator selection and torque. Infrequent operation will require higher torque values than for valves in modulating services, for example. Service factors are provided in the tables at the end of this bulletin.

More information for ball valve selection guide.