Backflow preventers are essential components of your plumbing system, protecting your drinking water from contamination. But with several different types available, knowing which one safeguards your home is crucial for proper maintenance and ensuring continued protection.
This blog will guide you through identifying the type of backflow prevention device you have.Before we dive into the types, it's important to understand that identifying your backflow preventer often requires a visual inspection of the device itself.
This usually involves locating the device (see previous blog post on locating your backflow preventer), and carefully examining its markings and physical characteristics. Safety first! Turn off the water supply to the device before attempting any close inspection.The most common types of backflow preventers are:
Double Check Valve (DCV): This is the most basic type and typically the least expensive. It consists of two independently operating check valves, each preventing backflow in one direction. DCVs are commonly used for low-hazard applications, such as irrigation systems or secondary water supplies. They are usually smaller and simpler in design than other types. Look for two clearly visible check valves on the device.
Reduced Pressure Zone Backflow Preventer (RPZ): These are more complex and offer a higher level of protection. An RPZ uses two check valves and a pressure differential relief valve to create a reduced pressure zone between the two check valves. This prevents backflow even under significant pressure differences. RPZs are required for higher-hazard applications, such as those involving potentially contaminated water sources. They are typically larger and more intricate than DCVs, with additional valves and pressure relief features.
Pressure Vacuum Breaker (PVB): PVBs are simpler than DCVs or RPZs and are often used for low-hazard applications like individual hose bibbs. A PVB uses a spring-loaded check valve and a vent to prevent backflow. They are usually smaller and less complex than other backflow preventers.
Double Check Valve with Atmospheric Vacuum Breaker (DCV-AVB): This combines the features of a double check valve and an atmospheric vacuum breaker, offering additional protection against vacuum conditions that could potentially cause backflow. It will have the features of a DCV with an additional vent or atmospheric relief.
Identifying Your Device
Once you've located your backflow preventer, look for markings on the device itself. Manufacturers usually stamp the type and model number on the device's body. This information will help you identify the exact type of backflow preventer you have. If the markings are unclear or illegible, you can take a picture and contact a plumbing professional for assistance.
They can identify the device based on its physical characteristics. Consider taking pictures of the entire device, including any labels or markings.Knowing the type of backflow preventer you have is crucial for several reasons:
Maintenance: Different types require different maintenance schedules and procedures.
Testing: Regular testing is essential to ensure the device is functioning correctly. The testing methods vary depending on the type of backflow preventer.
Compliance: Local water authorities often have specific regulations regarding the type of backflow preventer required for different applications.
In conclusion, identifying your backflow preventer's type is a vital step in ensuring the safety and protection of your drinking water. By carefully inspecting the device and looking for markings, or consulting a plumbing professional, you can gain valuable information to facilitate proper maintenance and ensure compliance with local regulations. Don't hesitate to seek professional assistance if you are unsure about the type of backflow preventer you have.
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