Nether Seal, a manufacturer of non-contact rising stem ball valves and dual expanding double block and bleed plug valves, has announced that it has obtained ISO 9001:2008 and PED 97/23/EC certification for another period of three years. After a quality surveillance audit by Lloyd’s Register Quality Assurance in June 2009, Nether Seal was found to be in compliance with ISO and PED standards and received renewal of the certification. The Quality Management System is approved in July 2009 and certificates are valid until 31st August 2012.