What type of regulator automatically takes control of pressure downstream in case of an emergency?

The type of regulator that automatically takes control of pressure downstream in case of an emergency is the monitoring regulator. Monitoring regulators are designed to maintain the pressure within a specified range and can respond to changes in downstream pressure, such as those that might occur during an emergency scenario. This ability to monitor and adapt makes them crucial for safety and efficiency in gas systems.

In emergency situations, if the downstream pressure exceeds safe levels, the monitoring regulator can adjust its operation to relieve excess pressure, thereby safeguarding equipment and preventing potential hazards from overpressure. This includes functions that might redirect or limit gas flow to ensure safe pressure management.

In contrast, adjustable regulators are typically set to a predetermined pressure and do not automatically respond to fluctuations without manual adjustments. Relief regulators focus on excess pressure scenarios by releasing pressure, but they are not by default controlling the downstream pressure in a consistent manner. Primary regulators are crucial for providing a steady outlet pressure yet do not possess the same automatic emergency response capabilities as a monitoring regulator.