The Spence figure 760/765 series stainless steel body prevents leakage of corrosive or expensive gases. The RXSO-S 760/765 series is equipped with a special Teflon seat, making bubble-tight seats possible to over 90% of set pressure per spec API 527 but is not applicable to steam. This valves provides overpressure relief of tanks, pipelines, vessels, and pumps. Figure 760/765 is also capable of working in stationary cryogenic storage tanks, dual safety relief systems and air and gas compressors.