Which component reduces hydraulic pressure to relieve tension during takeoff and maintains approximately 300-310 PSI?

Which component reduces hydraulic pressure to relieve tension during takeoff and maintains approximately 300-310 PSI?

• A. Low presser (LP)
• B. Pressure cap
• C. Expansion tank
• D. Y strainer

Answer: (A)

During takeoff, the hydraulic system can experience pressure spikes as demand increases. To keep the system safe and moving smoothly, a device that actively limits pressure by venting excess fluid is used. This is the low-pressure relief valve. It is set to open around 300–310 psi, allowing fluid to flow back to the reservoir or low-pressure side when the pressure rises too high. This relieves tension in the hydraulic lines and maintain a steady operating pressure, preventing overpressure that could stress components or cause stiff or erratic actuator movement. The other parts have different roles: a pressure cap mainly seals the reservoir and may vent if needed but does not regulate to a target pressure; an expansion tank provides space for thermal volume changes and doesn’t regulate pressure; a Y strainer is a filter that removes debris and does not regulate pressure.

During takeoff, the hydraulic system can experience pressure spikes as demand increases. To keep the system safe and moving smoothly, a device that actively limits pressure by venting excess fluid is used. This is the low-pressure relief valve. It is set to open around 300–310 psi, allowing fluid to flow back to the reservoir or low-pressure side when the pressure rises too high. This relieves tension in the hydraulic lines and maintain a steady operating pressure, preventing overpressure that could stress components or cause stiff or erratic actuator movement.

The other parts have different roles: a pressure cap mainly seals the reservoir and may vent if needed but does not regulate to a target pressure; an expansion tank provides space for thermal volume changes and doesn’t regulate pressure; a Y strainer is a filter that removes debris and does not regulate pressure.