I was wondering if anyone could help please.

I have a quick college question.

Heat Pump -

HEATING MODE - Discharge to indoor coil, indoor coil to compressor suction.

COOLING MODE - Discharge to outside coil, indoor coil to compressor suction.

When these cycles are switched how is the refrigerant metered by the TEV's ? or are the refrigerant flows bypassed and only sent through only one TEV on each cycle ? - I assume one way valves on each side and a bi-flow filter etc..

Any imput ?