How are relief valves typically set?

Relief valves are typically set by the adjusting screw or nuts. This method allows for precise adjustments to be made to the pressure at which the relief valve will lift and relieve excess pressure from a system. The adjusting screw or nuts enable the operator to increase or decrease the tension on the spring mechanism inside the relief valve, which directly affects the set pressure.

Using the adjusting mechanism ensures that the valve will open at the desired pressure to protect the system from overpressure conditions. This manual setting process is vital for ensuring the operational safety and reliability of equipment that operates under pressure.

Other methods such as manual operation, automatic calibration, or digital calibration are not standard for the setting of relief valves in most systems, as they don't provide the same level of precise control and reliability that the adjusting screw or nuts do.