Nibco Fire Protection Gate Valves User Manual download pdf (Page 10)

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 1-1/8 1-1/4 1-3/8 1-1/2

Torque in Ft. Lbs.

30 45 66 93 150 202 300 474 659 884 1057

BOLT TIGHTENING SEQUENCE

For any technical enquiries please call NIBCO Technical Services.

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Nibco Fire Protection Gate Valves User Manual Page 10