Aviation bypass valve including a shape memory alloy material

A heat exchanger apparatus for use in an oil cooling system of an aircraft engine comprising:

• an air-cooled oil cooler disposed in a bypass fan duct of the aircraft engine;
• and
• a bypass valve, in fluid communication with the air-cooled oil cooler, the bypass valve comprising:
• a valve body;
• a piston disposed in the valve body, and moveable therein;
• and
• an actuation component, wherein the actuation component includes a shape memory alloy (SMA), the actuation component responsive to a change in at least one of a thermal condition and a pressure exerted thereon so as to move the piston, thereby opening and closing the bypass valve.

An engine comprising:

• a core engine;
• and
• a heat exchanger apparatus comprising:
• an air-cooled oil cooler disposed in a bypass fan duct of an aircraft engine;
• and
• a bypass valve, in fluid communication with the air-cooled oil cooler, the bypass valve comprising:
• a valve body;
• a piston disposed in the valve body, and moveable therein;
• and
• an actuation component, wherein the actuation component includes a shape memory alloy (SMA), the actuation component responsive to a change in at least one of a thermal condition and a pressure exerted thereon so as to move the piston, thereby opening and closing the bypass valve.