Valve-Setting Adjustment Procedure - Midland A-1075 Installation, Operation & Maintenance Manual

4.5 Valve-Setting Adjustment Procedure

If your company has an approved test procedure, follow it. If it does not, these procedures provide essential guidelines
regarding pressure testing.
4.5.1 Remove the wire seal (item 16) from the spring adjustment nut, if required.
4.5.2 Loosen locknut (item 13) from the spring adjustment nut (item 12).
TIP: Use a 15/16" wrench to loosen the adjustment nut (item 12).
4.5.3 Using a press, invert the valve to compress the spring and relieve pressure
from the spring-adjusting nut. Use a tubular yoke that is partially cut-away to
press down on the spring follower further compressing (or decompressing) the
spring.
CAUTION: Stem-Thread Damage. Since all nickel-bearing stainless
steels have a likelihood of galling, wrenching the adjusting nut without
relieving the spring's load will frequently result in damaged stem
threads. Inspect threads for any sign of excessive wear, corrosion,
pitting or other defects. If any are found, the part is rejectable and
CAUTION
should be replaced.
Manual content is subject to change.
Visit midlandmfg.com for latest manual revision and revision history.
Figure 4-43 Remove Wire Seal
13
Figure 4-44 Loosen Locknut
Figure 4-45 Compress the Spring
16
12
A-1000, Rev. 3.2
Page 33 of 42