Butterfly valve (butterfly valve plus American Standard pole), working principle, characteristics, p

Description: Butterfly ( English: butterfly valve) is closed parts (disc or disc) to disk, around the valve axis to achieve the opening and closing a valve in the pipe and cut off from the main throttle use. Valve opening and closing is a disc-shaped pieces of the disc, the valve body around its own axis of rotation, or adjustments to achieve the purpose of opening and closing. Valve fully open to fully closed is usually less than 90