Technical Data
Torque Tables
Operating Torque Values for 300 Series thru 500 Series Valves
Item 1. The table below is a list of the Maximum torques which may be encountered.
Item 2. Most generally the actual operating torques are 10 to 20% less than these
figures depending upon the fluid flowing through the valve, the stem lubrication
and the condition of the seat.
Item 3. For operating pressures less than 6000 PSId the torque valuse are less.
It is recommended however the listed values be used for operating pressures between
3000 and 6000 PSI. For pressures of 3000 PSI and less, two thirds of the listed
value may be used. Torque values are maximum and under actual conditions they
may be less.
Torque Values are in Inch Pounds
| VALVE SIZE |
Running Torque |
Seat & Unseat Torque |
| 1/8" -0 |
15 |
30 |
| 1/4" -1 |
25 |
50 |
| 3/8" -2 |
35 |
70 |
| 1/2" -3 |
50 |
100 |
| 3/4" -4 |
80 |
160 |
| 1" -5 |
150 |
300 |
| 1-1/4" -6 |
250 |
500 |
| 1-1/2" -7 |
400 |
800 |
| 2" -8 |
400 |
950 |
Straight Thread Torque Values
1. The following torque values should be used for tightening straight thread
O-Ring sealed threaded connections.
2. The torque values shown apply to steel and/or stainless steel components.
3. It is recommended not to exceed ten percent (10%) of the values shown.
| Tube |
|
Thread |
Torque |
| Size |
Dash No. |
Size |
Ft. Lbs. |
| 1/4 |
-4 |
7/16-20 |
13 |
| 3/8 |
-6 |
9/16-18 |
2 |
| 1/2 |
-8 |
3/4-16 |
37 |
| 5/8 |
-10 |
7/8-14 |
44 |
| 3/4 |
-12 |
1 1/16-12 |
70 |
| 1 |
-16 |
1 5/16-12 |
111 |
| 1-1/4 |
-20 |
1 5/8-12 |
148 |
| 1-1/2 |
-24 |
1 7/8-12 |
155 |
| 2 |
-32 |
2 1/2-12 |
221 |
Union Nut Torque Values
1 The following torque values should be used for tightening O-Seal Union Nuts
when making up a joint.
2. The values apply to joints when used under pressure only. They do not apply
for stock assembly or, for shipping assembly. In the latter case hand tight is
acceptable.
3. The minimum values establish the lower limit for permanently made upjoints.
Lower values than this may be used for temporary service. Torque values larger
than the maximum are not recommended without consulting the engineering department.
| |
|
Ft. Lbs |
Ft. Lbs |
| Cat. No. |
Size |
Min. |
Max. |
| 50N-0 |
1/8 |
10 |
25 |
| 50N-1 |
1/4 |
10 |
25 |
| 50N-2 |
3/8 |
12 |
30 |
| 50N-3 |
1/2 |
15 |
40 |
| 50N-4 |
3/4 |
20 |
50 |
| 50N-5 |
1 |
25 |
60 |
| 50N-6 |
1-1/4 |
30 |
75 |
| 50N-7 |
1-1/2 |
35 |
90 |
| 50N-8 |
2 |
45 |
120 |
| 50N-9 |
2-1/2 |
60 |
150 |
Torque Values for Bonnets, Gland Nuts and Stem Retainers
of 300 Series Thru 500 Series Valves.
1. The following torque values are to be used for assemblying the valves given
2. The values shown are for dry assembly. If lubrication is used on the threads,
it is recommended that torques close to the minimum be used.
3. The minimum values establish the lower limit for permanent assembly. Lower
values should not be used. Torque values larger than the maximum are not recommended
without prior approval.
Torque Values in Ft. Lbs
| Valve |
Bonnet |
Gland Nut |
Stem Retainer |
| Size |
Min. Max. |
Min. Max. |
Min. Max. |
| 1/8 |
30 38 |
25 32 |
N/A |
| 1/4 |
40 50 |
25 32 |
N/A |
| 3/8 |
70 90 |
30 38 |
20 25 |
| 1/2 |
80 100 |
40 50 |
25 32 |
| 3/4 |
90 115 |
40 50 |
25 32 |
| 1 |
110 140 |
55 70 |
55 70 |
| 1-1/4 |
130 170 |
55 70 |
55 70 |
| 1-1/2 |
150 190 |
110 140 |
80 100 |
| 2 |
240 300 |
110 140 |
80 100 |
|
