Name Diaphragm Operated Control Valve Body WCB、WC6、WC9、304、316、304L、316L Trim,Seat,Shaft 304、304L、316、316L Standard Deviation(%) ±2.5% Return Difference(%) Without Positioner≤3 With Positioner≤1 Blind Spot(%) Without Positioner≤3 With Positioner≤0.5 Flow Characteristics Line、Equal Percent、Quick-Open Color Brown/Red/Blue/Black…