What is the result of back seating a two-way service valve?

Back seating a two-way service valve involves turning the valve stem in a certain direction that allows the valve to be opened in such a way that the service port remains closed while enabling normal flow through the valve. This is an essential operation in HVAC and refrigeration systems, as it allows for routine maintenance and service without interrupting the overall system flow.

In this scenario, the normal system flow continues, but the service port is closed. This is particularly important because it allows technicians to perform tasks such as pressure testing, evacuation, or refrigerant charging without affecting the flow of the refrigerant through the main system. By maintaining normal flow while keeping the service port closed, the system's integrity and efficiency can be preserved while enabling necessary service actions.