Which device in a hose or pipe prevents liquid from flowing backward?

Which device in a hose or pipe prevents liquid from flowing backward?

• A. Carrier
• B. Check valve
• C. Cone-Spray nozzle
• D. Containment system

Answer: (B)

A one-way flow device in a hose or pipe prevents liquid from flowing backward. This role is filled by a check valve, which allows fluid to move in the intended direction but blocks reverse flow. Inside, a movable element such as a ball, disc, or flap is pushed open by forward pressure and seats to stop flow if the pressure reverses. This stops siphoning and protects the supply and downstream equipment. Other devices don’t perform this function: a carrier is just the liquid medium being transported, a cone-spray nozzle shapes the spray pattern, and a containment system is for catching spills.

A one-way flow device in a hose or pipe prevents liquid from flowing backward. This role is filled by a check valve, which allows fluid to move in the intended direction but blocks reverse flow. Inside, a movable element such as a ball, disc, or flap is pushed open by forward pressure and seats to stop flow if the pressure reverses. This stops siphoning and protects the supply and downstream equipment.

Other devices don’t perform this function: a carrier is just the liquid medium being transported, a cone-spray nozzle shapes the spray pattern, and a containment system is for catching spills.