What does a vacuum breaker do in a sloan valve?

A vacuum breaker in a Sloan valve prevents the backflow of water into the potable water supply by ensuring that the pressure in the system does not drop below atmospheric levels. This device allows air to enter the Plumbing system when a vacuum is created, thus breaking the suction and preventing contamination. It is a critical component for maintaining water safety and compliance with plumbing codes. By preventing siphoning, the vacuum breaker helps ensure that water remains clean and uncontaminated.