Sewage Backflow Preventers, Residential Backflow Preventers, Double Check Backflow Preventer
Backflow is the undesirable reversal in the flow of water from a real or potential source of contamination back to the potable (or clean) water supply. Consider having a garden hose in a bucket of soapy water at your home, and having backflow event occur causing that soapy water to "backflow" into the drinking water portion of your home. Various types of backflow preventers exist for different applications and health hazard conditions, check state and other local administrative codes or other regulation on the correct backflow to use. The most common are reduced pressure backflow preventer and double check backflow preventer valves. Backflow preventers are primarily used in sewer, wastewater, residential backflow preventer, sprinkler and irrigation backflow applications.
Residential Backflow Preventer and Sewage Backflow Preventer
The term "Cross-Connection Control" is essentially is referring to backflow prevention. The definition of a Cross Connection is "A cross connection is the actual or potential connection between a non-potable substance or source." Local authorities will dictate what types of backflow preventers may not be used depending on the backflow risk and health hazard. Sewer, irrigation, wastewater and residential are the main areas. There are two types of backflow, the first is back pressure where the pressure in the downstream piping is greater than the supply pressure, this is caused by a pump or elevation of water in a high rise building, the other type of backflow is back siphonage which is caused by sub-atmospheric pressure in the water system piping.
See below for more Backflow Preventer Valve variations
Backflow Prevention Devices | Wastewater | Residential
Various types of backflow preventers exist for different applications and health hazard conditions, check state and other local administrative codes or other regulation on the correct backflow to use. The following backflow preventer types are available in all sizes:
Dual Check Valve - Model GF8080, GF8080E - The Dual Check Valve or double backflow prevention valve is basically a stripped down Double Check Valve without shut off valves and test cocks. They are non-testable and are typically used by water companies and installed after a water meter to prevent the meter from running backwards and low protection against backflow. This piece of equipment is the center of controversy with many backflow authorities and should never be confused with Double Check Valves. Check with local authorities for required installation, as most do not recognize these as backflow prevention devices.
Atmospheric Vacuum Breaker - Model GFAVB - The atmospheric vacuum breaker is one of the least expensive backflow prevention assembly. The GFAVB is a non-testable unit and are good for back siphonage only for non-health hazard or health hazard conditions. They must be installed downstream from any shut off valves and cannot be under pressure for more than 12 hours. If an GFAVB is used backflow prevention on a irrigation system you must install one GFAVB after every valve for each zone in the system. It must also be installed at least 6 inches (150 mm) higher than the highest outlet in the system (some GFAVB manufacturers, and some local officials, require that they be installed 12 inches (300 mm) higher than the highest outlet). Some municipalities do not allow the use of GFAVB’s. These units will NOT prevent backflow pressure and can only protect against back siphonage.
Atmosperic Vacuum Breaker
Size(s): 1/2 to 2 in. (15 to 50 mm)
Dual Check Valve
Size(s): 3/4 - 1-1/4 in (20 - 32 mm)
Hose Connection Vacuum Breakers
Size(s): 3/4 in. (20 mm)
Dual Check Valve
Size(s): 1/2 to 1 in. (15 to 25 mm)
Dual Check Valve with Atmospheric Vent
Size(s): 1/2 to 3/4 in. (15 to 20 mm)
- Test KitThis backflow prevention assembly test kit is designed for field testing of all brands of reduced pressure principle, double check and pressure vacuum breakers. • Test kit with five control valves • Accuracy: +/- .2 P.S.I.D. (descending) • Dial size: 4 1/2" round, 0 - 15 P.S.I.D. (descending) • Maximum working pressure: 200PSIManufactured by: Flomatic CorporationModel:Product ID: TK 1
- Atmosperic Vacuum BreakerPressure Max: 125 PSI Pressure Max: 125 PSI ASSE Listed 1001 Designed to prevent back-siphonage. Size(s): 1/2 to 2 in. (15 to 50 mm)Manufactured by: Flomatic CorporationModel:Product ID: GFAVB
- Dual Stainless Steel Check ValvePressure Max: 175 PSI Temp Max: 180° F (80° C) ASSE 1024 & UPC Listed (1-1/4" is not approved) For use on vending machine water supply lines to prevent reverse flow of potentially contaminated water or carbonated water. Consists of high quality stainless steel and two independently operating check valves with an integral atmospheric vent located between the checks. Size(s): 3/4 - 1-1/4 in (20 - 32 mm)Manufactured by: Flomatic CorporationModel:Product ID: GF8080S6
- Hose Connection Vacuum BreakerPressure Max: 125 PSI Temp Max: 180° F (80° C) ASSE Listed 1011 Designed to prevent back-siphonage or backflow of water, with vandal resistant features. Size(s): 3/4 in. (20 mm)Manufactured by: Flomatic CorporationModel:Product ID: GFHB8
- Dual Check ValvePressure Max: 150 PSI Temperature Max 180°F (82° C) ASSE Listed 1024 CSA Brass body with single union. Size(s): 1/2 to 1 in. (15 to 25 mm)Manufactured by: Flomatic CorporationModel:Product ID: GF8080E
- Dual Check Valve With Atmospheric VentPressure Max: 175 PSI Temp Max: 210° F (98° C) ASSE Listed 1012 Continuous pressure backflow preventer with an intermediate atmospheric vent, with double union ends. Size(s): 1/2 to 3/4 in. (15 to 20 mm)Manufactured by: Flomatic CorporationModel:Product ID: GF8200