A dual check valve is used to protect against which hazards?

The dual check valve is specifically designed to protect against both low hazard backpressure and backsiphonage situations. This type of valve is commonly utilized in applications where the risk of contamination from non-toxic substances exists.

In low hazard scenarios, the dual check valve helps prevent backpressure—when a source of pressure in the system pushes water back toward the potable water source. It ensures that even slight reversals of flow, which could occur due to changes in pressure, do not result in contaminants entering the safe water supply.

Additionally, backsiphonage refers to a condition where a drop in pressure in the distribution system causes a reverse flow of water back into the potable water supply, potentially bringing with it contaminants from the connected systems. The dual check valve is effective in preventing this reverse flow, thereby protecting public health.

Understanding the capabilities of the dual check valve is important in ensuring proper cross-connection control and safeguarding against lesser hazards found in everyday plumbing systems.