What additional feature should pressure relief valves be fitted with?

Pressure relief valves are crucial components in systems handling compressed natural gas as they help prevent dangerous situations by releasing excess pressure. Fitting these valves with rain caps serves an essential purpose: they protect the valve from environmental elements, particularly rain or debris, which can interfere with the valve's function. By shielding the valve, rain caps ensure that moisture doesn’t enter, which could lead to corrosion, mechanical failure, or obstruct the valve from opening correctly under pressure conditions.

In contrast, heating elements are not a common feature for pressure relief valves since they don’t necessarily contribute to the valve's primary function. Electronic monitors, while useful for various systems, are not seen as a needed addition to pressure relief valves specifically, which rely on simple mechanical principles. Assuming that no additional features are necessary overlooks the practical benefits that specific protective measures, such as rain caps, provide for the reliability and safety of pressure relief mechanisms in CNG delivery systems.