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- The incoming helium to the fridge is controlled by the fridge valves, namely the run valve and the bypass valve. Operational procedures are explained in on this page [Fridge Valve Control System at NM4].
- The outgoing helium from the fridge is controlled by the gate valve and the gate-valve bypass. Operational procedures are explained in on this page [How to control the Fridge Return flow (GV and GV Bypass)].