English to Italian Tech/Engineering Energy / Power Generation pipelines

In un testo tecnicissimo trovo:

"Principles of Operation
When the inlet pipeline pressure (upstream of the Surge Reliever) plus the added pressure required to over come the Tube material’s natural resistance to expand (the Tube’s Minimum Differential pressure or DF Minimum) exceeds the Jacket Pressure Set Point of the XXXXX Surge Reliever, the
Flexflo will start to open and start to relieve the line pressure upstream of the XXXX *Surge Reliever*.

Non sto trovando molto on line, sembrerebbe che si tratti di
*valvola di sicurezza per sovrappressione* (se si passa da https://www.proz.com/kudoz/english-to-spanish/engineering-in... a questo glossario inglese-spagnolo (ma io non conosco lo spagnolo)...

se qualcuno potesse confermare o smentire gli/le sarei grata, grazie!