What is another name for a vented loop that prevents back siphoning by breaking suction yet allowing normal flow when pressurized?

A vented loop, often referred to as a siphon break, plays a crucial role in preventing back siphoning in plumbing systems. This device works by introducing an air gap that interrupts the suction created in the plumbing when water is draining. This interruption stops the potential of backflow, which can lead to contamination or unwanted drainage into a source supply.

When the system is under normal pressure, the water can flow freely, allowing for proper functioning. However, should a drop in pressure occur, the siphon break ensures that air can enter the system instead of water being drawn back into it.

In contrast, a pressure relief valve is designed to release excess pressure in systems to maintain safety levels; a backflow preventer is specifically intended to stop any reverse flow of water but doesn't include the feature of breaking suction. The Venturi system operates on a different principle, utilizing a decrease in pressure to increase fluid velocity and doesn’t serve the primary function of preventing back siphoning.

Thus, the term 'siphon break' accurately captures the essential function of the vented loop in managing flow and preventing siphoning issues.