Learn why a pressure vacuum breaker is essential, where to find it, and how to maintain it. In this article, we’ll take a closer look at the basics of pressure vacuum breakers , including what they are, how they work, and why they’re important. It stops non-potable irrigation system water from flowing back to your homes drinking water supply. Vacuum breakers provide a simple, dependable way to relieve unwanted vacuum which may develop in a closed vessel or pipeline. This is an instructional video on how a pressure vacuum breaker works to protects the potable water system. more. Erich bernhardt, sales and applications engineer at kadant johnson, provides insight into the basics of vacuum breaker use. · a pressure vacuum breaker (pvb) is a safety component of irrigation systems. One essential piece of equipment that helps to ensure the safety of your home’s water supply is the pressure vacuum breaker (pvb). It works by using a spring-loaded check valve and an air inlet valve that open and close based on pressure changes in your system. The pressure vacuum breaker is installed close to the water source in the water flow before it goes into the sprinkler valves. A pressure vacuum breaker consists of a check device or valve and an air inlet, a chamber vented to the atmosphere. · a pressure vacuum breaker is a plumbing device designed to prevent backflow in a water supply system. A pressure vacuum breaker, or pvb, is a backflow prevention device designed to keep contaminated water from entering your clean water supply. It operates by allowing air to enter the system if a negative pressure occurs, which can happen during pipeline breaks or sudden water withdrawal.