For many years people in the choice of when to consider the control valve has been a number of traditional factors such as pressure on the ratings, the pressure drop, mobile media, temperature and costs. However, the situation in the past 10 years great changes have taken place, the valve has made considerable progress in the design, production processes and characteristics of the cost-effectiveness has been very different than before, so many choices in the past, when the valve must be considered the traditional The importance of factors has been greatly weakened.
While some traditional factors are still very important, but they only valve emphasis on the "static" performance. In fact they are the "table" on the valve to measure the results obtained, but such a result it is difficult to valves in the actual operation conditions will show what kind of performance. The traditional theory is that static factors carefully regulating valve will (and thus the entire loop) was a good performance. However, now we realize that this is not always the case.
Researchers and manufacturers to check the thousands of brass ball valve properties that, up to 50 percent of the valves used in (many of which are considered by the traditional factors of choice) to optimize the control loop performance failed to produce such a great effect. Follow-up study shows that valve to the dynamic nature of the process to reduce volatility played an important role. In many of the key processes in different valves to reduce the rate of flow volatility even if the difference one percent can significantly increase productivity and reduce waste, which can be achieved over 1 million U.S. dollars in economic benefits. It is clear that the economic benefits of this so that we can negate the traditional approach, that is only based on the initial purchase price valve to decide whether to buy.
Secondly, the traditional view is always that the process is always to improve optimization of control from the control room instrumentation upgrade. However, the test data show that in using the same control instrument conditions, the valve to the dynamic nature of the circuit have a significant impact. If the control valve can only reach five percent accuracy, then spend a lot of money to a configuration of its control accuracy can be brass ball valve achieved 0.5% of the senior control instrumentation systems and can not play much role.