North American 1146 and 1156 Wafer Valves Torque Requirements
Sheet 1146-2
Maximum Torque Requirements Inch-Pounds
1146,1156 Valve Size
Upstream Pressure, osi
4
8
12
16
24
32
40
-6 -7 -8
3" 4" 6"
70 70 70 70 80 80 90 90
70 70 70 80 90
70 70 80
70 70 80
70 70 90
70 80
70 80
100
100
-9
8"
90
90
110 130 160 200 240 290 340 405 486
120 150 200 240 300 360 434 530 637
130 170 230 280 350 430 536 656 788
-10 -12 -14 -16 -18 -20 -22 -24 -30 -36 -42
10" 12" 14" 16" 18" 20" 22" 24" 30" 36" 42"
100 110 140 150 180 200 230 260
110 130 150 180 210 250 290 335
100
110 120 140 160 180 200 362 924
100
110 130 140 221 597 806
DISCONTINUED
502 1252 1717
642 1579 2173
923 2235 3083
1204 2890 3994
1484 3545 4905
1262
DRIVE MOTOR SELECTION PROCEDURE Select wafer valve size based on required flow and allowable pressure drop in system. Read maximum torque required to drive valve at air pressure to be used. Select drive motor having at least this much torque. NOTES Table lists maximum torque required, which is a minimum for drive motor selection. Maximum torque occurs during opening, but may occur at different degrees of opening with different pressures and valve sizes. Torque table is based on tests conducted with North American "code flow" burners (40-50 fps cold air velocity). Code assumes about one-sixth of the total pressure available is spent in pipe loss, another sixth in control valve drop, and the remainder in metering and burner orifices. Table can be used for valves supplying single or multiple burners if pipe is properly sized. North American cannot supply torque data for higher velocities. WARNING: Situations dangerous to personnel and property may exist with the operation and maintenance of any combustion equipment. The presence of fuels, oxidants, hot and cold combustion products, hot surfaces, electrical power in control and ignition circuits, etc., are inherent with any combustion application. Components in combustion systems may exceed 160°F (71°C) surface temperatures and present hot surface contact hazard. Fives North American Combustion, Inc. suggests the use of combustion systems that are in compliance with all Safety Codes, Standards, Regulations and Directives; and care in operation.
CONTACT fna.sales@fivesgroup.com T +1 800 626 3477 - F +1 216 373 4237
Fives North American Combustion, Inc. 4455 East 71st Street - Cleveland, OH 44105 - USA www.fivesgroup.com
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