CHECK VALVES - SWING, TILTING DISC & PISTON - API594/API6D/BS1868/B16.34
Australian Pipeline Valve - Installation, Operation and Maintenance Manual
15
A P P E N D I X A - C O N T.
BOLT TIGHTENING SEQUENCE EXAMPLE
FIGURE 2
TABLE B
When torque wrenches are not available or suitable, the use
of standard wrenches and guidelines will apply to avoid over
torque or damage to the valve. (Never use impact wrench)
UNC BOLT SIZE
LENGTH OF WRENCH
3/8”
125mm (5”)
1/2”
150mm (6”)
9/16”
225mm (9”)
5/8”
300mm (12”)
3/4”
450mm (18”)
7/8”
600mm (24”)
1”
750mm (30”)
1 1/8”
900mm (36”)
1 1/4”
1050mm (42”)
