Spence Engineering Company Inc., Walden, New York, has announced the introduction of the new RXSO-S stainless steel safety relief valve. The RXSO-S is ideal for cryogenic service and where corrosive, noxious and/or expensive liquids or gases demand a premium seal. It features a Teflon® seat for API 527 spec bubble-tight seals at over 90% of set pressure. The RXSO-S meets ASME Code Section VIII and is TÜV certified. All RXSO-S Safety Valves are O2 cleaned for oxygen service in compliance with CGA specification G-4.1. The RXSO-S is available in sizes 1/2″ to 2″ and features all 316 stainless steel components and a 17-7PH spring. It is suitable for pressures to 400 psig and temperatures from cryogenic to 400°F.