(3) Assembling the valve plug and bonnet
Step Procedure
1 Apply an agent for preventing galling* to a new gasket and set the gasket on the valve
in place.
2 Insert the valve plug into the bonnet, then place the bonnet on the valve. Be sure to
align the matching marks, which were placed before disassembly, in order to set the
bonnet in the right position.
3 Apply an agent for preventing galling* to the threads of the stud bolts. Mount the
bonnet on the valve and tighten the nuts using a wrench. Be sure to tighten the nuts
evenly in a diagonal pattern to prevent uneven compression of the bonnet and to keep
the valve stem centered.
4
When done, all the nuts should be tightened to the torque specified in
Table 5-2.
WARNING
Because damaged or corroded bolts and nuts may damage the
valve and cause injury, replace them with new ones.
CAUTION
When reassembling the valve body, always use new packing
and gaskets. The reuse of old parts will cause fluid leakage.
Observe the tightening torques indicated in the user's manual
when tightening bolts and nuts.
Tighten the nuts for connecting the bonnet to the valve evenly
in a diagonal pattern.
* For a model of standard specifications, use Never-Seez made by the American company Bostik or
the equivalent.
For a degreased model, use GPL 207 made by Krytox or the equivalent.
5-10
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