Which configurations are listed under the types of check valves?

• A. Stop, swing, and lift
• B. Ball, globe, and needle
• C. Stop, swivel, and lift
• D. Swing, lift, and relief

Answer: (A)

Check valves are described by how their internal disc or poppet moves to block reverse flow. The common configurations you’ll see are swing, lift, and stop-check. A swing check uses a disc that pivots on a hinge and swings open with forward flow, then swings back to seal when flow reverses. A lift check has a disc that is pushed up by forward flow and seats to stop backflow when the flow direction reverses. A stop-check adds a fixed stop mechanism to encourage quick closure, which can help prevent water hammer in some systems.

The other options mix in valve families or functions that aren’t standard check-valve configurations. Ball, globe, and needle refer to whole valve types rather than the way a check valve’s disc behaves; swivel and relief describe mechanisms or purposes not used to classify check-valve configurations.