Vent Suit Temperature Sensor
connection of the anti-exposure suit when worn by the
pilot and/or crewmembers. The system provides a
The temperature sensor is located in a manifold
measure of personal comfort, offsetting the discomfort
downstream of the vent suit temperature valve (fig.
caused by the wearing of the anti-exposure suit or
5-16, item B). The sensor sends signals to the ACS
heat created by cockpit equipment and resulting
high-temperature ambient air.
The vent-air system for the F-18 aircraft supplies
Vent Suit Over-Temperature Sensor
temperature controlled and pressure regulated air to the
pilot's vent suit from the air cycle air-conditioning
The over-temperature sensor is a pneumatic
bleed-off sensor, located in a manifold downstream of
the vent suit temperature valve (fig. 5-16, item C). If
manifold temperature reaches 120°±15°F, the sensor
vents muscle pressure from the vent suit temperature
The vent-air system components include a vent suit
valve, causing the valve to close.
temperature valve and sensors, a regulating and a relief
valve, and a vent suit air hose assembly.
Vent Suit Pressure Regulating Valve
Vent Suit Temperature Valve
The valve is located downstream of the sensor
manifold and limits flow rate of 14 cubic feet per
The vent suit temperature valve is normally closed,
minute (cfm) at a pressure of 3 psi above cabin
pneumatically actuated, torque motor controlled, dual
pressure. The flow rate can be manually reduced below
poppet valve, which mixes warm and cold air. The
maximum by use of the manual flow control on the vent
location of the valve is shown in figure 5-16, item A.
suit air hose assembly.
The vent suit temperature valve torque motor regulates
muscle pressure to control hot and cold airflow. The
Vent Suit Pressure Relief Valve
ACS temperature/flow controller controls the torque
motor. The torque motor control in this valve can be
The pressure relief valve is a tube assembly
overridden by a vent suit over temperature sensor,
containing an integral spring-loaded poppet valve,
which vents muscle pressure to close the valve if an
which prevents rupture of the vent suit air hose
over temperature condition exists.
assembly by a failed vent suit pressure regulator. The
Figure 5-16.--Vent suit system component locator.