Why is the flow installed under the disc of the main valve body on the 50AF-2 pressure relief valve?

The flow being installed under the disc of the main valve body on the 50AF-2 pressure relief valve is designed to ensure that the valve remains functional in the event of a diaphragm rupture. When the diaphragm ruptures, the typical sealing function of the valve is compromised, which could lead to unsafe pressure levels within the system. By directing flow under the disc, the valve is engineered to open automatically, allowing pressure to escape and thereby preventing overpressure situations that could lead to system failure or damage.

This design aspect is crucial for safety, as it ensures that even if a critical component fails, the pressure relief valve can still perform its function to maintain system integrity. In contrast, while proper operation of the diaphragm and smoother flow may be important for valve performance, they do not address the primary safety feature associated with flow under the disc.