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What is the instrument ball valve? Instrument ball vlave is a kind of valve which the opening and closing parts(ball) are driven by the valve stem , and around the ball valve axis for rotating movement of the valve .Max pressure of this instrumentation ball valves could be up to 6000 PSI , the ball valve could be used for CNG station, LPG station , instrumentation and so on . The connection type has: female thread, double ferrules . It includes 2 way ball valve and 3 way ball valve.