5-5.2. Unit Operation Valve Replacement.
Tag or mark all hoses to allow correct reconnection and disconnect all hoses leading to or away from valve (refer
to paragraph 4-13).
Loosen two setscrews (8) located in sides of valve handle (9) and remove handle.
Mark valve top in some manner.
Remove four cap screws (10) securing valve (11) to control panel. As last screw is removed, hold valve to prevent
falling. Discard nuts.
Note the location of all hardware items in relation to valve top for reinstallation.
Hold removed valve securely and remove all elbows (12). Discard nuts.
Check replacement valve visually for defects. Do not use if defective.
Valve should come with handle pointing to OFF position. Mark valve body before removing
handle so valve will be installed with mark at top.
Loosen the setscrews (8) located in sides of valve handle (9) and remove handle. Discard nuts.
Wrap male threads with one layer of antiseize tape (item 3, Section II, Appendix F) and install elbows (12)
removed in d., above on valve (1 1), in same relative position as removed. Use mark indicating valve top as
From rear side of control panel, pass valve (11) control shaft through opening for unit operation valve. Make
certain mark is at top.
Align one panel valve mounting cap screw hole with a matching relative position hole in valve body. Keep mark at
Install one cap screw (10) through control panel into valve (11) body. Do not tighten.
Install three remaining cap screws (10) and tighten all four.
In accordance with tagging or marking scheme used at disconnect, reconnect all hoses leading to or away from
Install valve handle (9) with pointer indicating OFF and tighten two setscrews (8).