172-65634MAJ-03 (A-DR20) 6 Oct 2021
14
Reassembly
Assemble the unit using the same procedure as used for disassembling it; but in
reverse order. Observe the following precautions:
1. The PTFE gaskets may be re-used if free from fault, crushing or deformation.
2. Apply anti-seize to the steel ball and threaded portions of screws, bolts and the
adjustment handle. Apply a small amount of anti-seize agent to the threads of
the valve seat carefully to ensure it does not come into contact with other parts.
3. Fasten the bolts one at a time in a diagonal pattern alternately to provide
uniform seating.
4. After assembly, make sure that the valve stem operates smoothly without binding.
As shown in the figures above, when the main valve is tightened it may become
off-centered on the valve seat. If this occurs, move the main valve back to center.
5. Standard torque for fastening the respective screws and the width across flats of
the tools to be used are as follows:
Part
Torque
Distance Across Flats
N
m
(lbf
ft)
mm
(in)
Cover Bolt
25
(19)
13
(
1
/
2
)
Valve Seat
120
(88)
27
(1
1
/
16
)
(1 N
m
10 kg
cm)
NOTE: -If drawings or other special documentation were supplied for the product, any
torque given there takes precedence over values shown here.
Valve Seating Surface
