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There are some butterfly valve tips that are put forward by experts on the basis of the finite element simulation analysis in an axially symmetrical manner. Pneumatic actuators have been used in the calculation of the static characteristics of the butterfly valve tips that are implemented in a number of different models to suit the dynamics of the nonlinear effects. In general, with the butterfly valve tips, it is allowed to reduce the pneumatic actuators consumption when the pneumatic actuators are operating under certain air ration so as to preserve the ability to use conventional treatment technology in comparison with the shaft driven valves. What is more, butterfly valve tips advocate variable valve timing so that it is possible for an additional operation of cold start, warming up and transient optimization in contrast with the conventionally throttled valves that try to optimize the control of work load in each individual cylinder and cycle. To put it in another way, we may say that a load control strategy is generally used in the butterfly valve tips in order to provide a reduction in the initial emissions by approximately thirty percent. However, due to the possibility of pneumatic actuators wetting, the butterfly valve tips concerning the control strategy may find it difficult to improve the transition and the valve timing during the stroke may lead to high temperatures and low emissions, which is not very favorable for the safety of the entire system.
On the other hand, an increasing number of investigations has been carried out and has demonstrated that an improved accuracy of the butterfly valve tips actually facilitates the transient operation even though the flux linkage model can be divided into two regions including the linear region and the center region. At the same time, butterfly valve tips in different formats are recommended to be applied for different regions since only the linear region can be used for control design in later stages and the major pneumatic actuators parameters can be identified for both regions with the direct measurement of valve force and lift. In addition, the proposed prototype flux channels and the electric actuators design procedures have been presented, revealing a lot of advantages under the butterfly valve tips such as compactness, high tolerance, and fast response. The nonlinear butterfly valve tips are generally based on the feedback to render the valve actuator and have received much attention recently due to their potential for improving the performance of the pneumatic actuators. And actuators application experts suggest that the importance of each index in the butterfly valve tips can be no means be ignored so that the consistent matrix can be easily gained.