The A44Y-64/100C type fully open safety relief valve with wrench spring is suitable for equipment and pipelines with working temperature ≤ 300 ℃ in media such as air, steam, and petroleum.

A44Y-64/100P/R type wrench spring fully open closed safety relief valve is suitable for equipment with corrosive media working temperature ≤ 200 ℃ as an overpressure protection device.