What is the main difference between low pressure and high pressure safety relief valves?

The primary distinction between low pressure and high pressure safety relief valves lies in how they discharge the fluid they are designed to release under specific conditions. Low pressure safety relief valves typically relieve pressure directly to a drain, allowing for the safe disposal of the fluid without releasing it into the atmosphere. This is particularly important in systems where the fluid can be hazardous or when the pressure levels are not significant enough to warrant venting to the atmosphere.

On the other hand, high pressure safety relief valves are designed to vent the released fluid to the atmosphere. This is crucial because when pressure builds up in high pressure systems, it can pose significant safety risks. Venting to the atmosphere ensures that the excess pressure is released safely and effectively, helping to maintain system integrity and prevent potential accidents or equipment failure.

Thus, recognizing these operational fundamentals underscores the importance of each type of safety relief valve, particularly regarding their designated methods of discharge and the safety protocols associated with different pressure levels in boiler systems.