Fisher HPA Instruction Manual page 21

Instruction Manual
D101634X012
the valve plug stem end of the valve plug for flow‐up applications (view B of figure 20). Slide the backup ring (key 9)
onto the valve plug. Secure with the retaining ring (key 10).
For an HPAS Micro-Flat valve, ensure the Micro-Flat valve plug and stem assembly is oriented as shown in figure 10
when replacing the bonnet on the valve body. Then slide the bonnet over the stem and onto the stud bolts.
CAUTION
Micro-flat plugs must be installed as shown in figures 10 and18. This proper plug orientation increases the guide support
area for the plug and stem.
Figure 10. Micro-Flat Valve Plug Orientation
FLOW INLET
FLOW INLET
A5602
2. Install the valve plug into the cage.
TSO Trim
TSO trim: 0.8125 Inch Port Diameter (figure 7)
1. Thread the outer plug onto the inner plug until the parts seat metal to metal, using a strap wrench or similar tool
that will not damage the outer plug guide surfaces.
2. Mark 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. Drill through the inner plug with the proper size drill bit (same size as stem pinning) and install the pin.
TSO trim: 1.6875 Inch Port Diameter (figure 8)
1. Thread the outer plug onto the inner plug until the parts seat metal to metal, using a strap wrench or similar tool
that will not damage the outer plug guide surfaces.
2. Mark the top of the outer plug and stem 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 stem in the outer plug and torque to 11 NSm (8 lbfSft).
6. Assemble the piston ring, anti‐extrusion rings, backup ring, and retainer.
TSO trim: 2.6875 Inch and Larger Port Diameters (figure 9)
1. Thread the outer plug onto the inner plug until the parts seat metal to metal, using a strap wrench or similar tool
that will not damage the outer plug guide surfaces.
TWO-FLAT PLUG
ONE-FLAT PLUG
HP and HPA Valves
July 2017
21