Pneumatic control valve selection of dynamic characteristics

Traditional theory holds that carefully adjusting static factors will make the valve ( Thus the whole loop) For good performance. Now, however, we recognize that this is not always the case. Researchers and producers to tens of thousands of times of performance examination, up to 50% of the pneumatic control valve, Many of them by considering the traditional factors and selection) For optimization control loop performance failed to have much effect. Subsequent research has shown that the dynamic characteristics of to reduce process variability plays a very important role. In many of the key process, the range of the different valve to reduce process variability even a difference of 1% can greatly improve production efficiency and reduce waste, and great economic benefit can be obtained. Second, the conventional wisdom always think, the improvement of process optimization always upgrade from the control room control instrument. However, the test data show that under the condition of using the same control instrument, dynamic characteristics of valve can significant impact on the circuit performance. If the control valve accuracy can reach 5%, then, spend a lot of money to configure a set of its control precision can reach 0. 5% of the advanced control instrument system does not have much effect. In the search for a match the use situation of the valve, should first consider four basic types of the throttle valve, namely, cage ball valve, eccentric rotating ball valves, valve and butterfly valve. Cage ball valve adjustment form has a very wide range of species, thus can satisfy the requirements of most applications, making it become the preferred in the all kinds of valve. Cage ball valve adjustment piece has a lot of kinds, including balance adjustment, non equilibrium slice, adjustment of the elastic base seat, a constrained adjustment and full size pieces, etc. In many cases, a body of various configurations of TAB can be interchanged.