Algas SDI Direct Fired F6-ASME, Operation & Maintenance Manual, Page: 32 / 52

Maintenance
Algas-SDI Operation and Maintenance Manual – P/N – 54000 21
Liquid inlet valve maintenance procedure
Use Repair Kit P/n: 3-0016 (see repair kit section for kit details)
NOTE: Vaporizer must be purged and empty of all liquid and vapor prior to performing maintenance on the liquid
inlet valve.
1. Loosen the four bolts to remove liquid inlet valve cover on the outside of the
vaporizer cabinet.
2. Using a 7/16” end wrench or tubing wrench, loosen and remove the capacity
control valve sensing line fitting on the top of the inlet valve.
3. With a 1-1/2” box end wrench (suggest using 6 point), loosen the large nut on
the top of the inlet valve (inlet valve cap)
4. Loosen the 6 inlet valve flange bolts and remove the inlet valve from the
vaporizer through the hole in the cabinet.
5. Once the valve is removed from the vaporizer, remove the inlet valve cap
(large nut on top) and remove the spring from the valve.
6. Remove the valve seat and stem from the valve body and orifice.
7. After the seat and stem have been removed, using a socket, remove the inlet
valve orifice and wipe the top of the inlet valve orifice with a rag/cloth (one
that does not leave lint on surface) or lightly with a scotch-brite type material
to remove any debris and/or oils from the orifice surface.
8. Replace the O-ring under the orifice (use smallest O-ring from kit). Lightly
grease new O-ring before replacing it.
9. Once the inlet valve orifice O-ring has been replaced, return the orifice to the
valve and tighten accordingly.
10. Compare the length of the new stem from the repair kit to the old one that
was removed from the vaporizer to make sure they are the same. It is
important to make sure the new valve stem isn’t longer than the original stem
because it might prevent the valve from sealing properly. If needed, use a
metal file to shorten the stem to match the original stem length. New
vaporizers are fitted correctly and tested at the factory to make sure the seat
and stem assemblies have the proper length. If the seat and stem
assemblies have been changed in the field without checking the length
against the original stem or the valve was not tested in the shop to ensure it
is sealing (see “Water test” procedure below) there is a chance the stem
could be too long and not allow the inlet valve to close properly. If you are
uncertain about the prior replacement history of the valve stem you should
ensure the valve is tested in water to make sure the new stem and seat
assembly close fully before returning the inlet valve to the vaporizer.
11. Insert the new valve seat and stem assembly into the valve body lining up
the stem with the hole in the inlet orifice.
12. Replace the spring making sure it is centered on the top of the inlet valve
seat.
13. Lightly grease and replace the O-ring around the inlet valve cap (large flange
nut).