MULTI-PURPOSE VALVE

摘要

A multi-purpose valve comprises a valve body with inlet and outlet fluid openings and an elongated cylindrical fluid passageway therebetween and in fluid communication therewith. A butterfly type valve member is pivotally supported at its midpoint in the passageway and is swingable between open and closed positions respectively in alignment with and perpendicular to the longitudinal centerline of the passageway. A butterfly type check valve has a portion thereof an overlapping relationship with the first butterfly type valve member to minimize drag as well as the dimension of the two valves in the longitudinal direction. Alternatively, a "barn door" type check valve is provided for swinging movement of its vanes about a common pivot axis adjacent a downstream edge of the first butterfly valve member. Again drag loss is minimized and a highly compact valve assembly is provided. The first butterfly valve member is manually operated and has an associated indicator in the form of a movable pointer on an operating handle and an adjacent fixed scale. Upstream and downstream pressure taps are also provided.