Which component of the safety valve should not be adjusted during a hydrostatic test?

During a hydrostatic test, the component of the safety valve that should not be adjusted is the compression screw. The compression screw is responsible for adjusting the spring tension, which directly affects the pressure at which the safety valve will open to release excess pressure.

Adjusting the compression screw during a hydrostatic test could lead to an inaccurate assessment of the valve’s performance and could compromise the safety mechanism the valve is designed to provide. Ensuring the safety valve opens at its designated set pressure is crucial, as it plays a vital role in the safety of a boiler system.

On the other hand, adjustments to the spring tension, seat alignment, and valve body should generally be considered before or after the hydrostatic testing process to maintain the integrity and functionality of the valve, but not during the actual testing phase. This ensures that the safety features are reliably in place and can perform as expected under operational conditions.