When checking or adjusting a relief valve, which guideline is correct?

• A. Adjust without testing any gauge readings.
• B. Follow the manufacturer's guidance, test pressures with a gauge, and adjust only with proper tools and procedures.
• C. Make adjustments by feel alone.
• D. Remove valve and replace.

Answer: (B)

When checking or adjusting a relief valve, you must follow the device’s documented procedure and verify the setting with actual pressure readings. Using the manufacturer’s guidance ensures you respect the specific valve design, spring range, and tightening or calibration steps required for safe operation. Testing pressures with a gauge provides a real, objective measurement of when the valve will open and reseat, preventing over- or under-relief. Adjustments should be done only with the proper tools and procedures to maintain thread integrity, correct torque, and proper sequencing, ensuring the valve remains reliable and within its rated limits. Relying on feel alone is unreliable because spring tension and wear can vary, and it won’t give you a verifiable set pressure. Replacing the valve is not the standard action for a routine check or adjustment unless there’s an actual fault.