30
Lib
er
at
ors
Repair Procedures
XII
RP13 – Relief Valve Test (Figure 15)
a. Remove shroud (See RP2).
b. Assemble pressure gauge (Item A) and adapter (Item B) (use
PTFE tape).
c. Connect gauge assembly to humidifier adapter (Item 26) on FCV
outlet. Open FCV (Item 24) to 6 LPM setting.
d. Assemble oxygen regulator and pneumatic hose (Item C) with
DISS fittings and male pneumatic test adapter (Item D). Connect
assembly to oxygen gas source.
e. Connect male pneumatic test adapter (Item D) to Liberator
QDV (Item 15).
f. Slowly begin increasing pressure to between 1,5-1,7 bar/21.8-24.2
psig. PRV (Item 62) should begin venting (audible noise will be
heard or bubbling will be seen if leak testing).
g. Slowly begin decreasing the pressure until the PRV (Item 62)
closes, meaning the audible noise is no longer heard or the bub-
bling is no longer seen if leak testing. The pressure at which the
PRV closes should be greater than 1,4 bar/20.5 psig.
h. Hold PRV (Item 62) closed and increase pressure to 1,9-2,3 bar
(27-33 psig). SRV (Item 28) should open (audible venting and/
or bubbling of leak test solution).
i. Decrease pressure to 1,3 bar (19 psig). Test relief valve with leak
test solution. A minimal amount of leakage (bubbling) is accept-
able. If leakage is questionable, run pressure retention test before
changing relief valve (RP15).
RP14 –Relief Valve RR
Primary (Figure 16)
a. Remove shroud (See RP2).
b. Unscrew PRV (Item 62) from the economizer regulator (Item
35).
c. To replace PRV (Item 62), reverse above procedure. Tighten the
PRV approximately 10–20 degrees clockwise after the PRV body
contacts the economizer regulator (minimum of 230-350 N-cm
[20-30 in-lbs]).
Secondary (Figure 17)
a. Remove shroud (See RP2).
b. Unscrew SRV (Item 28) from FCV (Item 24).
c. To replace SRV (Item 28), apply Teflon® tape to the threads, stay-
ing back one thread from the end of the RV.
d. Tighten SRV to be leak free, approximately one turn from finger
tight.
D
C
15
A
26
28
24
B
62
35
FIGURE 15:
Relief Valve Test Set-up
FIGURE 16:
Primary Relief Valve
FIGURE 17:
Secondary Relief Valve
WARNING:
Liberator must be empty and vented before starting
procedure.
NOTE: Liberator should be empty and warm before testing.
Liberators Technical Service Manual • PN 13350704 Rev
K
