Spence Engineering Co. Inc., Walden, NY, USA, has introduced thenew RXSO Safety Relief Valve. The RXSO is ideal for cryogenic service and where noxious or expensive liquids emand a premium seal. It features a Teflon® seat for API 527 spec bubble tight seals at over 80% pressure. The RXSO meets ASME Code Section VIII and is TÜV certified. All RXSO Safety Valves are O2 cleaned for oxygen service in compliance with CGA specification G-4.1. The RXSO is suitable for pressures to 400psig and temperatures from cryogenic to 400ºF.