TM 5-4310-393-14
4-14.6. VALVE HEAD ASSEMBLY, THIRD STAGE
This task covers' A Remove B Inspect C Install
Tools:
Materials/Parts:
Valve Head Wrench (PIN 004555)
O-ring (P/N N02789)
Torque Wrench (P/N 6006NMA)
Halo Carbon Grease, NSN 9150-00-754-2760
Gasket (P/N N03625
Equipment Conditions:
Compressor Secured and Cold
All Air Pressure Purged From System
A Remove.
1.
Removing the 3rd Stage Discharge Valve Remove the 3rd stage discharge valve for inspection as follows:
NOTE
The discharge valve (Figure 4-11, Item 8) is inserted into the valve head (10) It is
sealed by an O-ring (7) and fixed to the valve head with a set screw (4)
a.
Remove the plain cap nut (Figure 4-11, Item 2) and the gasket (3). Unscrew the socket set screw (4)
three or four turns If the gasket is damaged, replace it with a new gasket
b. Remove the socket head cap screws (5) that secure the valve head (10), then remove the valve head
cover (6).
c. Place two screwdrivers into the groove of the discharge valve body and lift out the discharge valve (8)
together with the O-ring (7). If necessary, loosen the valve first, using a 13 mm open-end wrench on the flat surfaces
2. Removing the Inlet Valve.
a. Remove the tube connections to the valve head (10).
b. Unscrew and remove the socket head cap screws (5).
c.
Remove the valve head cover (6).
d. Extract the inlet valve (13) using the valve tool provided with the unit.
B Inspect
1.
Inspecting the Discharge Valve.
a. Check the O-ring. It should be undamaged and not torn. Replace it if necessary.
b. If the discharge valve does not close tightly, It should be replaced. The bore diameter of the valve
seat should be 4 0 mm
4-25
