Method for regulating a valve

摘要

The method involves arranging a steam bypass valve (46) in a steam line (44) that comprises an injection device (48) for injecting water. A water amount, a target water amount and a maximum water amount deficiency are determined, and a quotient between water amount deficiency and the difference of target water amount and the water amount is formed, and the valve is closed when the quotient is less than a clock frequency. The water amount deficiency is formed by multiplication between maximum injection water amount and maximum time.