Back siphonage prevention is achieved by using what device?

Back siphonage prevention is achieved by using what device?

• A. Venturi valve
• B. Check valves
• C. Pressure regulator
• D. Capsule filter

Answer: (B)

Back siphonage happens when pressure in the supply line drops or reverses, pulling contaminated water back into the clean water supply. A check valve is the device that stops this by allowing flow in only one direction and automatically closing if downstream pressure rises or reverses. This one-way flow prevents any contaminated water from being drawn back into the source, which is exactly what’s needed to prevent back siphonage in pesticide application setups. The other options don’t serve this purpose: a venturi valve is mainly used to create suction for mixing or injecting additives, not to block reverse flow; a pressure regulator lowers downstream pressure but doesn’t stop backflow if the supply pressure drops; a capsule filter removes particulates but offers no protection against reverse flow.

Back siphonage happens when pressure in the supply line drops or reverses, pulling contaminated water back into the clean water supply. A check valve is the device that stops this by allowing flow in only one direction and automatically closing if downstream pressure rises or reverses. This one-way flow prevents any contaminated water from being drawn back into the source, which is exactly what’s needed to prevent back siphonage in pesticide application setups.

The other options don’t serve this purpose: a venturi valve is mainly used to create suction for mixing or injecting additives, not to block reverse flow; a pressure regulator lowers downstream pressure but doesn’t stop backflow if the supply pressure drops; a capsule filter removes particulates but offers no protection against reverse flow.