What is required downstream of each regulator or immediately downstream of the isolating valves for the regulators?

A pressure indicator is critical downstream of each regulator because it provides real-time information about the pressure levels in the medical gas system. This enables healthcare personnel to monitor the pressure at which the medical gases are delivered, ensuring that they are within the specified range for safe operation. Proper pressure levels are essential for patient safety and the effective function of medical devices that utilize these gases.

If the pressure indicator shows that the pressure is too high or too low, it can prompt immediate corrective actions to maintain safety standards. This monitoring is invaluable, particularly in medical situations where precise gas pressures are necessary for patient treatment and respiratory support.

While other components, such as flow meters, safety valves, and shut-off valves, play important roles in medical gas systems, they do not fulfill the specific requirement of indicating pressure levels directly associated with the downstream safety and operational conditions of the gas delivery system.