An ASME B16.34 control valve is a valve manufactured according to the ASME B16.34 standard, which is limited to flanges and flange fittings made from cast or forged materials, as well as blind flanges and certain eccentric flanges made from cast, forged, or plate materials.
As a control component in fluid transport systems, the ASME B16.34 control valve functions to direct flow, shut off flow, regulate flow, throttle, prevent backflow, divert, or relieve pressure.