11.
Anti-Ice Valve (fig. 1-31).
The anti-ice valve is located in the bleed air system between the
water extractor outlet duct and the turbine section of the ACM. This
valve is spring-loaded closed, electrically controlled, pneumatically
actuated, and has a one-inch diameter. The anti-ice valve serves as
both a shut-off and a modulating valve. The inlet port of the valve
connects to a tube connected to the water extractor housing and the
outlet port connects to the duct using a slide coupling and an "O"
ring type seal.
The valve has a torque motor and an electrical
connector (fig. 1-32).
Figure 1-31.
Anti-Ice Valve.
Operation (fig. 1-33). The anti-ice valve allows warm air
from the water extractor to bypass the turbine section of
the ACM and enter the turbine discharge air.
The valve
uses air from the tapoff prior to the venturi for valve
actuation.
The anti-ice valve air can be controlled two
ways:
(1)
electrically
by
the
torque
motor
(2)
pneumatically by the anti-ice servo valve (describe later
in the lesson).
When the temperature controller sends an electrical signal
to the torque motor, the current in the anti-ice torque
motor increases.
The torque motor moves the flapper from
the supply nozzle toward the vent nozzle.
27
OD1705
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