A conventional safety relief valve holds a disc against the seat using a calibrated spring, set to compress and lift the disc the instant system pressure exceeds the spring’s rated force. Once open, the valve typically pops fully open rather than modulating, releasing pressure quickly before reseating as pressure drops back below the set point. Because the spring sits exposed to the vessel’s backpressure, changes in downstream pressure can affect the set point, which is why this design suits applications with a stable, predictable backpressure rather than the variable conditions better handled by a pilot operated valve.

Common Applications

• Vessel and pipeline overpressure protection with stable backpressure
• General process safety relief service
• Applications where full pop action provides faster pressure release
• Standard relief duty across refineries and process plants