Both backflow preventors and check valves serve key functions in the controlled movement of liquids, ensuring that a flow direction is maintained and that a system’s operation remains unimpeded. We’ll examine some of the key distinctions below.
Backflow is defined as the reversal of a fluid’s flow within a system due to instances of back pressure or back siphoning taking place. Back pressure is when the demand pressure exceeds the supply pressure, while back siphoning is when the supply-side pressure experiences a significant drop.
In either case, problems can quickly mount when backflow occurs, as contaminated water can begin mixing with clean water, harming the final output. Backflow incidents can also be quite costly and time consuming, with the average incident necessitating corrections totaling as much as $15,000.
Backflow preventers are devices that inhibit contaminated water from reversing flow and spoiling water that is headed for a potable, or drinkable, water source. These components are typically found at cross-connection points where municipal drinking water enters a commercial or residential building to then be distributed by internal piping.
Backflow can occur when water pressure fluctuates or suddenly surges, such as during periods of high demands in a system or when a break happens in a main water line. When this takes place, a reversal of water can bring with it sewage, chemicals, and other harmful substances, illustrating the importance of reliable backflow preventers.
Check valves, meanwhile, serve similar purposes as backflow preventers but have some key distinctions. These flow-sensitive components allow liquid to flow unimpeded in one direction, but should the flow reverse, the valve will respond to the change in direction and flow velocity and will close.
These units are not designed to handle the major water systems with higher pressures found in municipalities, but they are more than capable of working in a range of commercial and industrial applications. One aspect to note is that the minimum upstream pressure needed for check valve operation is between 1 and 5 pounds of force per square inch, known as the cracking pressure.
No, a check valve cannot be regarded as a safe substitute for a backflow preventer, especially when protecting drinking water, because it lacks the multiple fail-safe features required for high-risk contamination scenarios.
A backflow preventer is specifically designed to prevent sewage from flowing back into a building, whereas a check valve is a general device that stops media from flowing in reverse in various non-sewage and high-risk applications.
Contaminants that can be introduced into the public drinking water supply include fertilizers, pesticides, human waste, and harmful chemicals from building systems for sprinklers or irrigation.
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