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USER MANUAL
hydraulic bolt tensioning equipment will specify number of exposed threads outside the
nut.
•
Do not use damaged or worn stud bolts or nuts.
•
Do not use nuts or stud bolts that do not fit together correctly.
•
Do not use nuts or stud bolts without grade or type identification.
•
Do not mix nuts or stud bolts of different coatings. Different nut and stud bolt coatings
require different torques to achieve the same bolt tension.
•
Do not assemble nuts with the identification hard stamp against the back face of the
flange
Stud bolt and nut storage
Remove each nut and bolt as a pair. Thread the matching nut back onto the bolt. Stack
them in a fashion that will not cause thread damage.
Reuse of stud bolts and nuts
The reuse of threaded fasteners is permitted on Daniel control valves under the following
conditions:
•
Fasteners are clean, free of corrosion, paint, thread damage, cracks, teeth marks
(caused by wrenches) or other signs of damage.
•
Fasteners are not tightened to or beyond their yield strength.
•
Fasteners have not lost their coating.
Compare the threads of a used stud bolt with the thread of a new stud bolt. Finger-tighten
the nut over the entire thread length of the bolt.
Installation procedure
User manual
August 2019
DAN-20064957
40
707 Spring Loaded Back Pressure Valve
