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Chapter 6 - Purge Valve Replacement
6.4 PURGE VALVE REPLACEMENT
The purge valve is located in the rear service door. The fitting is a Schrader valve that provides a nitrogen purge
conduit to the turret's internal space, and it is used to remove humidity and dry the inside air of moisture. Failure
symptoms of the purge valve can be:
•
stem physically broken
•
visible damage to the exterior threads or internal poppet valve
•
turret's humidity indicator remains high despite purging for 2 hours
•
when purging, leak check applied to the valve bubbles
Table 6-5 Purge Valve Replacement — Parts
Item
Nomenclature
(1)
Schrader valve
(2)
Valve cap
(3)
Chuck for valve insert
October 2007
106
1
#170
Figure 6-3 Removing the Purge Valve from Rear Turret Door
TA322-2198
TA322-1999
5265
P/N
Qty
1
1
1
TM00358 Rev. A
Notes
• Drawing part #170.
• Commonly referred to as
the purging valve.
• Torque to 30 in.lbs
(3.4 Nm)
• Order new part if missing.
L-3 WESCAM
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