S 432-008
(4)
Install the four mounting bolts on the pressure relief valve.
S 412-009
(5)
Install the surge tank access door 543AB or 643AB
(AMM 28-11-03/401).
TASK 28-13-04-202-011
4. Pressure Relief Valve - Inspection/Check (Fig. 201)________________________________________
A. Equipment
(1)
Check Fixture, Surge Tank Pressure Relief Valve
-G28005-18 (Recommended)
-G28005-14 (Optional)
(2)
Pressure Source, range 0 to +1.50 psig.
Commercially available.
(3)
Vacuum Source, range 0 to -3.00 psig.
Commercially available.
B.
Access
(1)
Location Zones 543 Surge Tank - Rib No. 21 to No. 23 (Left) 643 Surge Tank - Rib No. 21 to No. 23 (Right)
(2)
Access Panels
543AB Surge Tank Access Door (Left)
643AB Surge Tank Access Door (Right)
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757 MAINTENANCE MANUAL
C. Procedure
S 222-010
(1)
Do a check on the pressure relief settings of the pressure relief valve.
(a)
Remove the four bolts on the left or right surge tank access door, 543AB or 643AB.
(b)
Put and hold the check fixture of the pressure relief valve on the exit of the pressure relief valve.
(c)
Install the check fixture bolts.
(d)
Connect the pressure source to the check fixture.
(e)
Slowly and continuously supply a positive pressure of more than
1.00 psig.
(f)
Make sure the pressure relief valve opens between 1.00 and 1.25 psig.
(g)
Put the pressure to 0 psig.
(h)
Remove the pressure source.
(i)
Hold the check fixture and remove the check fixture bolts.
(j)
Remove the check fixture.
(k)
Pull the T-handle down until the pressure relief valve sets again.
(l)
Put and hold the check fixture of the pressure relief valve on the exit of the pressure relief valve.
(m)
Install the check fixture bolts.
(n)
Install the vacuum source on the check fixture.
(o)
Slowly and continuously supply a vacuum pressure of more than -2.50 psig.
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