METSO NELES HIGH-PERFORMANCE VALVE, METAL SEATED SERIES BW Neles BW series metal seated high-performance butterfly valve with one-piece body design, for both control and tight shut-off applications. Multiple body options make it particularly well suited for the refining, power, petrochemical, and chemical industries. The BW provides extended operational life in control, tight shut-off and critical applications such as high cycle, high temperature, cryogenic, oxygen, and abrasive applications, etc. Rating from ASME 900 to 2500 makes the BW a sound control or shut-off valve in severe service applications.