Backflow information

Backflow is a term in plumbing for an unwanted flow of water in the reverse direction. It can be a serious health risk for the contamination of potable...

A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow. In water distribution systems,...

The term Eurasian backflow, or Eurasian back-migrations, has been used to describe several pre-Neolithic and Neolithic migration events of humans from...

A reduced pressure zone device (RPZD, RPZ, or RPZ valve) is a type of backflow prevention device used to protect water supplies from contamination. RPZDs...

to allow blood flow and which then close together to seal and prevent backflow. The mitral valve has two cusps, whereas the others have three. There are...

of the valve function thereby opening up the ureter to backflow. The main risk of such a backflow is the spreading of urinary tract infections up into the...

a clapper valve (if not designed into the hydrant already) to prevent backflow into the hydrant. Additionally, residents who wish to use the hydrant to...

A pressure vacuum breaker (PVB) is a type of backflow prevention device, used to keep non-potable (or contaminated) water from entering the water supply...

commonly used in medical applications to prevent contamination due to backflow. One end of the valve is stretched over the outlet of a supply line, conforming...

veins into the coronary sinus and from this one into the right atrium. Backflow of blood through its opening during atrial systole is prevented by the...

atrium to the right ventricle during diastole, and to close to prevent backflow (regurgitation) from the right ventricle into the right atrium during right...

non-potable fluid, the water supply shall be protected against backflow by a backflow preventer. Where a hose bibb is installed outside a building, inside...

Spinal anaesthesia Backflow of cerebrospinal fluid through a 25 gauge spinal needle after puncture of the arachnoid mater during initiation of spinal anaesthesia...

many causes. GERD is the most common cause of esophagitis because of the backflow of acid from the stomach, which can irritate the lining of the esophagus...

vinegar, fruit juice, or wine or for a fitting or tubing installed between a backflow prevention device and a carbonator." The FDA's Model Food Code specifically...

Na+ and water reabsorption in a hyperaldosterone state actually causes "backflow" of Na+ and water into the tubules. Normally Na+ and water are reabsorbed...

regardless of flow direction or pressure. In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior), it can...

ensures blood flows in the correct direction through the heart (preventing backflow). After gas exchange in the pulmonary capillaries (blood vessels in the...

A backwater valve is a backflow prevention device used to prevent outbound water through a dwelling's drain pipes from re-entering -- "back flowing"—into...

potable (drinking) water supply, a backflow prevention device is required for most fertigation systems. Backflow requirements may vary greatly. Therefore...

An Atmospheric Vacuum Breaker (AVB) is a backflow prevention device used in plumbing to prevent backflow of non-potable liquids into the drinking water...

Backflow of cerebrospinal fluid through a spinal needle after puncture of the arachnoid mater during spinal anesthesia...

A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It is different...

practice, is an arrangement of pipes formed into a vertical loop to prevent backflow of water within the plumbing potable water system. Since a siphon has a...

v t e Plumbing Fundamental concepts Air gap (plumbing) Backflow Compatibility (chemical) Corrosion Drain (plumbing) Drinking water Fuel gas Friction loss...