Flowserve 50165 Nordstrom Figure User Manual
Page 37
Nordstrom Figure 50165 and 50169 Dynamic Balance Iron Plug Valve FCD NVENIM2006-00 – 09/05
flowserve.com
Technical Data: Procedure
for Tightening Cap Screws
note: This procedure is intended only as a guide. It is impossible for Flowserve Sulphur Springs Opera-
tions to know actual field-site conditions, so your judgement and experience must be exercised.
1. Inspect applicable parts to be sure that:
a) Tapped holes are clean, dry, and free of foreign matter.
b) Threads are free of nicks, grit, and burrs.
2. Apply a quality thread lubricant on the threads of the Cap Screws/Nuts, or the tapped holes, and the
contact face of the Cap Screws/Nuts.
3. Install all Cap Screws/Nuts by hand. Engage the threads at least 1/2 of the diameter before using a
wrench.
4. Hand-tighten the first four Cap Screws/Nuts in the sequence shown in Diagram 1. This is to avoid
cocking the parts.
5. Tighten the Cap Screws in a crisscross pattern. Tighten them first to the 10% torque value, then in a
crisscross pattern to the 75% torque value.
6. Repeat Step 5, tightening the Cap Screws to the full torque value as shown in the table below.
7. Recheck the torque on all Cap Screws. If the torque is less than the minimum shown, tighten them
to the full torque.
Valve Size
intermediate
Final
10%
75%
Min.
Max.
4
14
104
127
150
6
22
167
205
240
8
34
257
315
370
10
22
167
205
340
12
34
257
315
370
14
34
257
315
370
16
54
407
500
585
18
70
521
640
750
20
70
521
640
750