i see what you are saying And understand it. And we have so many of these valves our there running fine... To answer you ? with all the racks we operate the hot gas in this situation is injected at the suction line just above the epr on the rack it self so we dump hot gas in the suction and it back feeds the suction line in reverse flow and exits the coil at just before the txv. After that we go pass a check valve that is set to block flow during refrigeration(so we don't dump in metered gas in the Evap coil) and the hot gas bypasses the cases had valve and it returns to the liquid header for that cases, from there we go back to the rack, were it enters a defrost hot gas dump line to be sent to the roof and be condensed. After we end the defrost the hot gas sol. Valve closes, the suction epr is opened after the drop time expires and we return to refrigeration. Hope this show more light. Martin