Iron valve bolt torque, Bolt tightening sequence – NIBCO Fire Protection Gate Valves User Manual

Page 10

Text mode
Original mode

NIBCO Technical Services • Phone: 1.888.446.4224 • Fax: 1.888.336.4224

7/8” bolts

24” wrench

1” bolts

36” wrench

IRON VALVE BOLT TORQUE

Before tightening, make sure all surfaces that the fastener will contact are clean and dry.

The torque tightening table listed below applies to clean, undamaged, non-lubricated threaded
fasteners (lubricated threaded fasteners may require less torque – consult the fastener
manufacturer for more detailed instructions).

When tightening, use the sequence chart below. Tighten in two steps.

1. Tighten fastener using about 1/2 the final torque figure.
2. Final tightening using the full torque figure. ASTM A307 steel only.

Fastener Size

7/16

1/2

9/16

5/8

3/4

7/8

1-1/8

1-1/4

1-3/8

1-1/2

Torque in Ft. Lbs.

150

202

300

474

659

884

1057

BOLT TIGHTENING SEQUENCE

For any technical enquiries please call NIBCO Technical Services.