Fisher HPA Instruction Manual page 22

HP and HPA Valves
July 2017
2. Mark the top of the inner plug and outer plug with alignment marks in the assembled position.
3. Disassemble the outer plug from the inner plug and install the seal over the inner plug, so that the seal rests below
the threaded area.
4. Thread the outer plug onto the inner plug and tighten with a strap wrench or similar tool until the alignment marks
line up. This will ensure that the plug parts are metal to metal and the seal is compressed properly. Do not damage
the outer plug guide surfaces.
5. Install set screws centering the inner plug in the outer plug and torque to 11 NSm (8 lbfSft).
6. Assemble the piston ring, anti‐extrusion rings, backup ring, and retainer.
All Constructions
1. Install the bonnet gasket (key 11) on the cage.
2. Install the bonnet over the valve stem and onto the valve body.
Note
The prelubricated hex nuts (key 14) referred to in step 3 can be identified by a black film coating on the nut threads.
The proper bolting procedures in step 3 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.
Figure 11. HPD with C‐seal Trim
37B1399‐A
CAUTION
Failure to comply with good bonnet‐to‐body bolting practices and the torque values shown in table 8 may result in damage
to the valve. Cheater bars or slug wrenches should not be used for this procedure.
Hot torquing is not recommended.
Note
Stud(s) and nut(s) should be installed such that the manufacturer's trademark and material grade marking is visible, allowing easy
comparison to the materials selected and documented in the Emerson/Fisher serial card provided with this product.
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Instruction Manual
D101634X012