Back flow preventers are described by many different names include backflow valves, backwater valves and backflow preventers.  No matter what they are called, their primary job is to prevent contaminated water from flowing back into the potable water supply. They work by automatically sensing a reversal in water flow in the pipe and they automatically

It order to understand the use of back flow valves, it is first necessary to understand why they are needed, and to do that we need to understand the phenomenon known as backflow. Under normal conditions in a normal water supply system, potable water flows from the city’s water supply to the individual homes and

A backflow valve is a prime example of a backflow preventer, the purpose of which is to prevent contaminated water from flowing back into a clean water supply.  The backflow assembly is generally installed at exit points in a basement or a sewer pipe.  The valve closes immediately when sewage flows or when the pressure