REPLACEMENT OF TUBING MARKERS.
a. Using knife, carefully cut away tubing marker being replaced (1, Figure 4-11).
Check to determine if the new marker will slide over the tubing nut on the line. It may
be necessary to cut the tubing just behind the nut as indicated in by (2) to slide new
marker onto tube.
When using heat gun be careful when applying heat. Too much heat will damage
b. Slide new tubing marker (3) onto tube and use heat gun to shrink to proper fit.
If tubing nut has been removed, place tubing nut (4) then new compression fitting (5)
onto tube. Insert into fitting and tighten.
Figure 4-11. Tubing Markers
CLEANING OF CHECK VALVES.
a. Disconnect tubing or piping from check valve (see detailed procedures for specific removal steps). Remove
assembled check valve.
b. Unscrew valve cap (1, Figure 4-12) from valve body (2) to remove spring (3) and seat (4).
c. Clean any debris from check valve body (2), spring (3) and valve seat (4). Flush components with soap and water
solution, rinse thoroughly and dry.
d. Install seat (4) and spring (3) into body (2). Thread hex collars (1) onto body (2) and connect tubing or piping.
Figure 4-12. Cleaning of Check Valves