In accordance with an exemplary embodiment, a method for manufacturing a bypass valve of a turbine engine control system is described. The bypass valve includes a proportional valve and an integrator valve and the integrator valve includes an integrator sp...

A heat exchange system includes a first flow passage (404) and a second flow passage (406). The heat exchange system is configured to transfer heat between a first fluid flowing through the first flow passage (404) and a second fluid flowing through the se...