What does the abbreviation BV stand for in plumbing terminology?

The abbreviation BV stands for "Branch Vent" in plumbing terminology. A Branch Vent is an essential component of plumbing systems that allows gases and pressure to be equalized in the drainage system. It connects to a drainage line and extends upward, providing ventilation to the system. This is crucial as it helps prevent the siphoning of water from traps in plumbing fixtures, maintaining proper water seals and preventing odors from entering the living space. By efficiently allowing air to enter the drainage system, branch vents play a vital role in ensuring the overall functionality and hygiene of plumbing installations.