3-way butterfly valve/directional valve Certificataion:ISO,CE,API,ABS,WATERMAR History:17 years (Since1994) 3-way butterfly ... on your request.Certificates: We have held the certificates of ISO, ISO 9001, SAI Global Watermark, ABS (Design Assessment Certificates), API 6D ... , CE/PED for many years and view the ISO 9001 as the minimum standard to maintain ...