Engine: Motor Plants and Auxiliary Boilers

1. A The device is a relief valve with feedback to prevent excessive pressure from damaging system components.
2. B The regulator, or pressure reducer, drops the supply pressure to the desired operating level.
3. C The regulator reduces the pressure of the supply air to provide ancillary main engine services.
4. D Constant pressure is maintained at device "B" while device "C" is used only to modify the output signal.

Tip: press A-D to answer