Figure 1-11.
Overtemperature Switch Schematic.
Failure Mode.
If the switch contacts stick closed on
contact B, the light remains lit, and if the contacts stick
closed on contact C, the light stays off (will not light if
an overtemperature condition occurs).
4.
Pressure Regulating Valve (fig. 1-12).
The pressure regulating valve mounts to the outlet of the bleed air
section of the precooler using a V-band type clamp. This valve also
has an arrow on the case indicating the direction of airflow from the
precooler. A large actuator protrudes from a linkage box mounted on
the valve case (fig. 1-13).
This valve functions to shut off air
flow and regulate downstream pressure at 35 +3 psi.
Operation (fig. 1-14). The pressure regulating valve is a
pneumatically actuated, solenoid controlled, and spring-
loaded closed pressure regulator and shut-off valve.
For
this valve to stay closed when applying pressure, the
system must have the solenoid energized.
To open this
valve, the air goes through the self-cleaning filter and to
the reference pressure regulator. The preference regulator
maintains a constant pressure and allows the pressure to
pass through the de-energized solenoid.
13
OD1705
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