When a refrigeration valve is back-seated, the gauge port opening is ______.

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Multiple Choice

When a refrigeration valve is back-seated, the gauge port opening is ______.

Explanation:
Back-seating a refrigeration service valve creates a seal against the back seating surface inside the valve, which stops flow through the valve. Because that secondary seal blocks the internal path, the gauge port is no longer connected to the refrigerant flow. So the gauge port opening is closed. This positioning is used to isolate the system during service, preventing leaks when connecting or disconnecting hoses.

Back-seating a refrigeration service valve creates a seal against the back seating surface inside the valve, which stops flow through the valve. Because that secondary seal blocks the internal path, the gauge port is no longer connected to the refrigerant flow. So the gauge port opening is closed. This positioning is used to isolate the system during service, preventing leaks when connecting or disconnecting hoses.

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