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The value of Kv can be calculated according to the values given, such as: flow, Pressure drop and data of the operating conditions of the installation. Le Kvs of the valve: To characterize the standard valves, one gives a Kvs coefficient, which corresponds at the coefficient Kv for a nominal displacement of H of the valve. For each type of standard valve, one gives a nominal displacement of H for which the valve can be regarded as completion open. For a new valve, this leakage rate must be lower than 0.