Chapter 6 - Purge Valve Replacement
TM00358 Rev. A
October 2007
L-3 WESCAM
106
All Rights Reserved
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
Figure 6-3 Removing the Purge Valve from Rear Turret Door
Table 6-5 Purge Valve Replacement — Parts
Item
Nomenclature
P/N
Qty
Notes
(1)
Schrader valve
TA322-2198
1
• Drawing part #170.
• Commonly referred to as
the purging valve.
• Torque to 30 in.lbs
(3.4 Nm)
(2)
Valve cap
TA322-1999
1
• Order new part if missing.
(3)
Chuck for valve insert
5265
1
#170
1
