Backflow preventers are mechanical devices that protect against backflow, which is when contaminated water flows back into a drinkable water supply. Backflow occurs due to a sudden change in pressure or a break in the water main. Put simply, a backflow preventer ensures water inside fire sprinklers, irrigation systems, and other water-based systems flow in the desired direction: from the water main into the system.

WattsBackflowpreventer

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A pressure reducing valve is exactly what it sounds like, a valve that reduces the water pressure in your home.

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Fully Equipped 3-Stage Filtration System, Water Softener, (3) Stainless Steel Quick Connect Hoses and Filters Installed

Don't take clean drinking water for granted; do your part to help protect your facility, employees, and community by partnering with a qualified fire protection company for backflow preventer services.

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While NFPA 25 used to require testing, the 2011 edition removed this requirement. NFPA explains its decision as follows:

The best practice is a flow velocity of 3 ft./sec. or less. Flow rates up to 5 ft./sec. are possible for power generation. Flow rates over 5 ft./sec. are problematic and not a wise design criteria. The chart is for cast iron and thicker grades of pipe. Thinner or lower classes of pipe will be slower.

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Types of irrigationbackflow preventers

Single access cover and modular check construction for easy maintenance. Large body passages provide low pressure drop. Compact, space-saving design.

Regulations for backflow testing are now set forth by local plumbing codes and enforced by municipalities and local water purveyors. Most jurisdictions require annual backflow testing; however, it may be required more frequently in some cases. Failure to comply could result in fines or the disconnection of water service.

Anti-siphon valves are used to help prevent the accidental siphoning of a product from a tank in the event of a leak downstream below the liquid level.

A certified backflow tester will conduct annual testing to ensure each component is in good condition, moves freely, operates correctly, and adheres to requirements from the local water purveyor or city.

Backflow preventers are required by law in many states and must be tested annually to ensure they are working correctly. Understanding backflow preventers and annual testing requirements will help you prevent avoidable accidents and meet code requirements in your area.

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Backflow preventers on fire protection, irrigation, and other water-based systems must be tested annually to ensure they are working properly and that no potential risks or contaminants enter the drinking water supply.

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What are the four types ofbackflow preventers

State regulations and local municipalities typically require backflow preventer installations in commercial and industrial properties that contain chemicals, fertilizers, and other hazardous substances.

Volume of system without Expansion Tank(Vs, m3). Atmospheric ... Linear coefficient of thermal expansion(α, m/m.k). Result. Expansion Tank Volume(Vt, m3).

Learn more about the Detailed Specifications General Brand WATTS Type Type Other Additional Information Date First Available May 29, 2020.

Property owners should check with their local water purveyor to better understand the specific requirements for backflow preventers in their area.

While having a backflow preventer installed is important, it is just as important to have it tested to ensure regulatory compliance and device functionality. Backflow tests also help ensure the drinking water supplied to your commercial property remains safe.

“While backflow remains a legitimate health concern, preventing it is now considered outside the scope of NFPA 25. The standard presumes that local or state requirements will continue to ensure that the devices are properly tested by qualified personnel."