...prevent flow of liquid from returning to the source of supply. Also called vacuum breaker. *** 203.5 BACK-SIPHONAGE - the flowing back of used, contaminated or polluted water from a plumbing fixture or vessel into a water supply pipe due to a negative pressure in such pipe. See backflow. 203.6 BACKWATER...

...control valve. Figure 15 shows the typical installation of this vacuum breaker. 3. Backflow preventer — Reduced pressure zone type. An assembly of differential valves and check valves, including an automatic opening port to the atmosphere to prevent backflow due to higher pressures on the discharge...

...than the intended source. Back siphonage is one type of backflow. Back Siphonage - Back siphonage is the flowing back of used, contaminated, or polluted water from a plumbing fixture or vessel into a potable water supply due to a negative pressure in such a pipe. Branch - A branch is...

...distributing pipes of a potable supply of water from any source or sources other than its intended source. Backsiphonage - The flowing back of used, contaminated, or polluted water from a plumbing fixture or vessel or other source into a potable water supply pipe due to negative pressure in such pipes. Blower...

...Backflow Preventer A device or means to prevent backfiow. Backflow Preventer, Reduced Pressure Principle Type An assembly of differential valves and check...opened spillage port to the atmosphere. Backsiphonage Backflow resulting from negative pressures in the distributing pipes of a potable water supply. Cross-Connection...