Instruction Manual
D103211X012
NotchFlo DST Valve
March 2011
11
9. Cover the opening in the valve body to protect the gasket surface and to prevent foreign material from getting into
the valve body cavity.
10. Remove the packing flange nuts (key 21), packing flange (key 19), upper wiper (key 27), and packing follower (key
28). Carefully push out all the remaining packing parts from the valve side of the bonnet using a rounded rod or
other tool that will not scratch the packing box wall.
11. Clean the packing box and the following metal packing parts: packing follower, packing box ring (key 26), spring
or lantern ring (key 24), and, for single arrangements of PTFE V‐ring packing only, special washer (key 25).
12. Inspect the valve stem threads for any sharp edges that might cut the packing. A whetstone or emery cloth may
be used to smooth the threads if necessary.
13. Remove the protective covering from the valve body cavity, and install the seat ring and cage using new seat ring
gasket(s) (key 12), bonnet gasket (key 11), and cage gaskets (if applicable) (key 65). Install the plug, then slide the
bonnet over the stem and onto the studs (key 13).
Figure 6. Installing Graphite Ribbon/Filament Packing Rings One at a Time
VALVE STEM
PACKING
FOLLOWER
BONNET
TOP OF PACKING
RING EVEN WITH
BOTTOM OF
ENTRANCE
CHAMFER
INSTALLING
SECOND PACKING RING
A2207‐2
INSTALLING
FIRST PACKING RING
Note
The prelubricated hex nuts (key 14) referred to in step 14 can be identified by a black film coating on the nut threads.
The proper bolting procedures in step 14 include‐‐but are not limited to‐‐ensuring that the bonnet stud threads are clean, and that
the hex nuts are evenly tightened to the specified torque values.
CAUTION
Failure to comply with good bonnet‐to‐body bolting practices and the torque values shown in tables 5, 6, and 7 may result
in damage to the valve. Cheater bars or slug wrenches should not be used for this procedure.
Hot torquing is not recommended on CL900, CL1500, and CL2500 valves. When operating temperature has been reached,
perform this torquing procedure once again on CL600 valves.
14. Lubricate the stud threads and the faces of the hex nuts (key 14) with anti‐seize lubricant (not necessary if new
factory prelubricated hex nuts are used). Install the hex nuts and tighten them finger‐tight. Stroke the valve several
times to center the trim. Torque the nuts in a crisscross pattern to no more than 1/4 of the nominal torque value
specified in tables 5, 6, and 7.