Plumbers and pipe fitters use which type of valve to direct fluid in a pipe in one direction?

Plumbers and pipe fitters use which type of valve to direct fluid in a pipe in one direction?

• A. Check Valve
• B. Globe Valve
• C. Gate Valve
• D. Ball Valve

Answer: (A)

Check valves are designed to let fluid flow in only one direction while preventing backflow. They use a movable element—such as a disc, ball, or flap—that opens with forward pressure and seals when flow would reverse, stopping any backward movement. This makes them ideal for protecting pumps and supply lines from reverse flow and for preventing back-siphonage. Other valves like globe, gate, and ball valves primarily regulate or shut off flow and don’t automatically block reverse flow, so they aren’t inherently one-way devices.

Check valves are designed to let fluid flow in only one direction while preventing backflow. They use a movable element—such as a disc, ball, or flap—that opens with forward pressure and seals when flow would reverse, stopping any backward movement. This makes them ideal for protecting pumps and supply lines from reverse flow and for preventing back-siphonage. Other valves like globe, gate, and ball valves primarily regulate or shut off flow and don’t automatically block reverse flow, so they aren’t inherently one-way devices.