If the ball float of a low side float metering device sinks, what will happen to the suction pressure?

When the ball float of a low side float metering device sinks, it indicates that the float is no longer being supported by the liquid level, which typically means that there is a low liquid level in the system. In such cases, as the liquid level drops, the suction pressure will actually increase due to the design and mechanics of this type of system.

In a refrigerating or similar system where a low side float is used, the float controls the flow of refrigerant or fluid into the evaporator. When the float sinks, it may mean that less liquid is being introduced into the system, which can lead to the pressure on the suction side rising. This is primarily due to the reduction in the refrigerant flowing into the evaporator, causing changes in the pressure dynamics and potentially leading to an increase in suction pressure.

Thus, the correct outcome in this scenario is that the suction pressure will rise.