The device that protects a vacuum pump from creating too low a vacuum is

The device that protects a vacuum pump from creating too low a vacuum is

• A. Vacuum breaker
• B. Pressure relief valve
• C. Check valve
• D. Damper

Answer: (A)

Preventing damage from excessive negative pressure in a vacuum system is the key idea. When a vacuum pump pulls air out of a system, the pressure can drop very low. If the vacuum becomes too strong, seals, gaskets, and pump internals can be damaged or fail. A vacuum breaker opens to the atmosphere at a preset vacuum level, letting air into the system and raising the pressure back toward ambient. This limits how deep the vacuum can get and protects the pump and piping. The other devices don’t provide this protection: a pressure relief valve vents when pressure is too high, not when it’s too low; a check valve blocks reverse flow but doesn’t regulate vacuum levels; a damper adjusts flow resistance without addressing excessive vacuum.

Preventing damage from excessive negative pressure in a vacuum system is the key idea. When a vacuum pump pulls air out of a system, the pressure can drop very low. If the vacuum becomes too strong, seals, gaskets, and pump internals can be damaged or fail. A vacuum breaker opens to the atmosphere at a preset vacuum level, letting air into the system and raising the pressure back toward ambient. This limits how deep the vacuum can get and protects the pump and piping.

The other devices don’t provide this protection: a pressure relief valve vents when pressure is too high, not when it’s too low; a check valve blocks reverse flow but doesn’t regulate vacuum levels; a damper adjusts flow resistance without addressing excessive vacuum.