Which device is specifically designed to prevent back siphonage under continuous pressure?

The device specifically designed to prevent back siphonage under continuous pressure is the anti-siphon vacuum breaker, particularly the pressure type. This device works by allowing air to enter the system when it detects negative pressure, effectively breaking the siphon that could allow contaminants to flow back into the potable water supply.

An anti-siphon vacuum breaker is needed in applications where there is a risk of back siphonage due to hydraulic pressure changes in the plumbing system. Unlike other devices, it is specifically engineered to accommodate continuous pressure and prevent any potential backflow that could occur due to a drop in pressure.

Other devices do have roles in controlling flow or preventing backflow but do not serve the same function as the anti-siphon vacuum breaker for this particular scenario. For instance, a check valve prevents backflow but typically relies on a difference in pressure rather than actively managing continuous pressure situations. A pressure relief valve is designed to release excess pressure from the system, not to combat back siphonage. Similarly, a backwater valve is installed to prevent sewage from flowing back into the plumbing system, but it does not specifically address the issue of back siphonage. This highlights the specialized function of the anti-siphon vacuum breaker in maintaining safe