Which statement best describes the function of a bleeder valve?

Which statement best describes the function of a bleeder valve?

• A. It relieves pressure after the discharge valve has been closed
• B. It increases pressure during startup
• C. It directly controls discharge volume
• D. It seals the discharge line

Answer: (A)

Bleeder valves are used to vent residual pressure in a piping or hydraulic system after the discharge valve has closed. When the main valve shuts, the fluid in the downstream line can still be pressurized because of fluid inertia and compressibility, and any trapped gas or steam needs a path to escape. Opening the bleeder provides a controlled vent, reducing pressure spikes, allowing safe shutdown, and helping purge air before the system restarts. It isn’t intended to increase pressure, control the main discharge volume, or seal the line.

Bleeder valves are used to vent residual pressure in a piping or hydraulic system after the discharge valve has closed. When the main valve shuts, the fluid in the downstream line can still be pressurized because of fluid inertia and compressibility, and any trapped gas or steam needs a path to escape. Opening the bleeder provides a controlled vent, reducing pressure spikes, allowing safe shutdown, and helping purge air before the system restarts. It isn’t intended to increase pressure, control the main discharge volume, or seal the line.