Ground-based power generator with ball-roller bearing butterfly valve

A hot gas valving system for a ground-based power generation system, the hot gas valving system comprising:

• a gas flow conduit having a wall and defining a path for fluid flow;
• and
• a butterfly valve located in the wall of the gas flow conduit and transversely across the path for fluid flow, the butterfly valve comprising,
• a first raceway defined by an inner ring and a cooperatively associated outer ring,
• a second raceway defined by an inner ring and a cooperatively associated outer ring,
• a combination of ball bearings and roller bearings retained in the first raceway and the second raceway,
• an axle rotatably mounted in the inner rings of the first raceway and the second raceway and cooperably rotatable therewith, and
• a baffle mounted longitudinally along a length of the axle and extending from the axle into the path of fluid flow;
• wherein upon rotation of the axle, the baffle restricts or permits fluid flow;
• and
• wherein the combination of ball bearings and roller bearings accommodates both an axial load on the axle and a radial load on the axle.