What is the normal operating position for two-way service valves in refrigeration systems?

The normal operating position for two-way service valves in refrigeration systems is back seated. In this position, the valve is fully open to allow free flow of refrigerant through the system, which optimizes efficiency during regular operation. When the valve is back seated, the stem is pushed back away from the seat, reducing pressure on the sealing surface and preventing leakage.

Choosing this position ensures that the refrigeration system can operate effectively without impediments to the flow of refrigerant. This is essential for the system to maintain the desired temperature and pressure levels. The other positions may either restrict the flow or create unwanted pressure differentials, which could lead to system inefficiencies or potential damage. Therefore, understanding the function and appropriate positioning of service valves is crucial for ensuring optimal performance and longevity of refrigeration systems.