Hydraulic reservoirs have _____ to prevent fluid surging and foaming?

• A. Check valves
• B. Baffles
• C. Fill level indicators
• D. Filters

Answer: (B)

When hydraulic fluid surges and foams, it’s usually caused by pulsating flow from the pump and turbulence inside the reservoir. Internal baffles act as partitions that slow down and redirect the liquid, breaking up rapid velocity changes and creating zones where air can separate from the liquid. This dampens pressure fluctuations and reduces surface agitation, which helps prevent foaming and keeps the fluid supply to the pump stable. The other options don’t address surge and foam: check valves control backflow, fill level indicators show how much fluid is in the reservoir, and filters remove contaminants but don’t dampen surge or foaming.