What type of valve is used to prevent over-pumping or unwanted siphonage of a chemical into a potable water supply?

The back pressure valve is specifically designed to prevent over-pumping and unwanted siphonage, which is crucial when dealing with chemicals in a potable water supply. This valve works by maintaining a certain pressure level within the system, thereby preventing backflow. When the pressure in the main line rises, the back pressure valve closes to prevent any chemicals from being siphoned into the clean water supply.

This function ensures that the potable water remains uncontaminated, which is vital for public health and safety. With various sources of potential contamination present, back pressure valves serve as a necessary safeguarding mechanism to uphold the integrity of drinking water supplies.

Other types of valves, like pressure relief valves, are designed to release excess pressure but do not specifically control backflow; thus, they wouldn't be suitable for preventing siphonage in this context. Regular valves typically function as on/off valves without the necessary backflow prevention features, while float valves are used for controlling levels of liquid in tanks rather than preventing siphonage or contamination. The unique characteristics of back pressure valves make them the appropriate choice for this application.