15
Table 2.12 Dealing with Purge Valve Leaks
Type of Leak
What to Do
Leak from the drain pipe
when the purge valve is
closed
Firmly tighten the purge valve knob
If the leak persists, replace the purge valve needle
(See Section 5.6.1)
Leak from the base of the
purge valve knob when the
valve is open
Check for drain tube clogging
If the drain tube is not clogged, remove the purge
valve knob, leaving the needle in place, and
tighten the purge valve guide (See Fig. 2.5)
Note: Tightening the purge valve guide without
the needle inserted may cause the
packing to be overly compressed, making
reinsertion of the needle impossible.
If the leak persists, replace the purge valve
packing
(See Section 5.6.2)
Guide
Needle
Drain tube
Knob
Figure 2.5 Tightening the Purge Valve
2.4.4 Outlet port (line filter) leaks
To stop leaks from the outlet port (See Section 5.2.2), tighten the filter holder. If the
leak persists after the filter holder has been tightened, the line filter (sintered
stainless steel) or outside packing (PEEK) may be damaged or scratched. Refer to
Section 5.2 for instructions on line filter replacement.