Air cycle machine module air gate seal for environmental control systems

A tandem air cycle machine module comprising:

• a first air cycle machine having a first compressor and a first turbine;
• a second air cycle machine having a second compressor and a second turbine;
• an isolation valve comprising:
• a housing operably connected to both the first air cycle machine through a first inlet in the housing and the second air cycle machine through a second inlet in the housing, the housing having an internal surface;
• an air gate having an outward face opposite the internal surface, the air gate being located within the housing and configured to move to at least one of a first position blocking flow to the first outlet, a neutral position blocking flow to neither the first outlet nor the second outlet, and a second position blocking flow to the second outlet;
• a seal groove located on the outward face of the air gate;
• a seal located within the seal groove, the seal being configured to form a sealed connection with the internal surface around at least one of the first outlet when in the first position and the second outlet when in the second position;
• and
• a retainer configured to secure the seal within the seal groove using a fastening mechanism.