INSTALLATION, OPERATION & MAINTENANCE INSTRUCTIONS
FIGURE 310AM, 310AMSW & 311AM 3-PIECE BALL VALVE
DOC: IOM_FNW310(1)AM_ ver_4-2011
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BODY BOLT TORQUES for ASTM A193-B8
Valve
Size
Bolt Size
In-Lbs NM
1/4" 1/4-20UNC 70 7.9
3/8" 1/4-20UNC 70 7.9
1/2" 1/4-20UNC 70 7.9
3/4" 5/16-18UNC 100 11.3
1" 5/16-18UNC 100
11.3
1-1/4" 3/8-16UNC 160 18.1
1-1/2" 3/8-16UNC 160 18.1
2" 3/8-16UNC 160
18.1
2-1/2" 9/16-12UNC 580 65.6
3" 9/16-12UNC 580
65.6
4” 5/8-11UNC 800
90.5
Table 1
OPERATION
1. Ensure that the valve materials are compatible with the service and that the operating characteristics are
below the valve maximums.
2. Fluids containing particles or coagulating agents are not acceptable as they can reduce the life of the seats
and cause the torque to increase dramatically.
3. Care must be taken if throttling the valve (operation in partially open position). Critical pressure drops and
high flow rates can decrease the life of, or damage, the seats. For optimum operation, open/close
applications are recommended.
4. The valve comes standard with a locking device. Slide the locking plate up the lever before operating. Open
and close the valve by turning the handle one-quarter turn (90°).
5. The valve is in the open position when the handle is parallel to the pipe, and in the closed position when
perpendicular to the pipe.
