What happens to the automatic expansion valve (AXV) when the evaporator pressure rises after the compressor stops?

When the evaporator pressure rises after the compressor stops, the automatic expansion valve (AXV) responds to changes in pressure to help regulate the flow of refrigerant into the evaporator. The primary function of the AXV is to maintain the pressure and ensure that the evaporator operates efficiently.

When the compressor stops, the pressure in the evaporator can start to rise, leading to an increase in the pressure sensed by the AXV. In this case, the valve is designed to close as a response to the increased pressure. This closing action restricts the flow of refrigerant into the evaporator, preventing an oversupply of refrigerant that could lead to flooding or inefficient operation. By closing, the AXV effectively helps maintain a proper balance within the system until the compressor starts again and the pressures stabilize.

The other choices involve actions that are not aligned with the functioning of an AXV during the specific scenario of rising evaporator pressure after the compressor has stopped. Thus, the correct choice reflects the valve’s crucial role in regulating refrigerant flow in response to changes in pressure.