11
External-Style Pressure Relief Valve A-1402C Series
2.2.7
Inspect the tongue of a reconditioned or retested valve by running
your fingernail around its inner and outer edges to check for damage.
The tongue dimensions have diameter tolerances of ±0.003", thus
any excess material on these diameters will make it difficult to fit the
tongue into the groove. If the tongue is peened over, remove excess
material to meet AAR tongue tolerances.
2.2.8
Remove the rubber plug (which was inserted in step
1) from the cover plate.
2.2.9
Install filler gasket (Item 32) over the mounting studs.
2.2.10
Hold the valve by the flue assembly (Figure 2-2) and lower it gently into
the mounting. Align the body holes over the studs and lower the valve
while positioning the valve tongue in the cover plate groove.
2.2.11
Install the nuts and tighten them in 1/3-torque increments in a
diagonally alternating sequence to a torque specified by the gasket
specified, as shown in Figure 2-3.
Figure 2-3 Mounting-Nut
Tightening Sequence
CAUTION:
To prevent
Tongue Damage
, do not install a valve
having damaged sealing surfaces.
CAUTION: Tongue Not in Coverplate Groove.
Verify that the
valve tongue has fit into the coverplate groove. It must be so
engaged before continuing with the next step or valve damage
may result.
CAUTION: Uneven Gasket Compression.
Do not over-tighten
the nuts on one side of the valve as this may tilt the valve and
result in uneven gasket compression.
CAUTION
CAUTION
CAUTION
Figure 2-2 Valve with Flue Assembly
and Filler Gaskets