When work on a refrigeration system is complete, the service valves should be in this position:

When work on a refrigeration system is complete, the service valves should be back seated. This position ensures that the valve stem is pushed back, allowing for maximum flow of refrigerant through the system and preventing any refrigerant from leaking out. By back seating the valve, it effectively restricts the flow to the service port, minimizing the risk of unintended refrigerant release during non-service periods.

The other positions are less ideal for different reasons. If the valves are front seated, they are in a position to block flow, which could lead to issues if the system needs to be serviced again in the future. A cracked position refers to a slight opening that could allow refrigerant to escape, which is not safe or efficient. The midpoint position leaves some uncertainty about whether the system is sealed or open, which isn’t ideal for system integrity. Therefore, back seating the service valves is standard practice for ensuring safety and the longevity of the refrigeration system after service is completed.