Adjust the pneumatic valve dynamic characteristic importance for selection

regulating pneumatic valve factory inspection, mainly for static characteristic test, including basic error, rated travel deviation, return difference, starting point and end point deviation, dead zone, repeatability error, sealing, leakage, etc. , all these were made in the case of no-load test, actually they are on the workbench to measuring results gained by the pneumatic valve, but the result is difficult to explain the regulating pneumatic valve under the condition of actual operation will show what kind of performance. Traditional theory holds that carefully adjusting static factors will make the pneumatic 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, as much as % of adjusting pneumatic 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 behavior of pneumatic valve to reduce process variability plays a very important role. In many of the key process, the extent of different pneumatic valve to reduce process variability even % difference can greatly improve production efficiency and reduce waste, and great economic benefit can be obtained. Obviously, the economic benefits of such that we can completely negate the traditional approach, namely only according to the original purchase price the pneumatic valve to decide whether to buy. 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, the dynamic behavior of pneumatic valve can significant impact on the circuit performance. If the control precision of the pneumatic valve can only achieve %, so spend a lot of money to configure a set of its control precision can be achieved. % of the advanced control instrument system does not have much effect. In the search for a match the use situation of pneumatic valves, should first investigate the two basic types of pneumatic valve throttle control, namely the cage pneumatic ball valve, pneumatic valve, eccentric rotary float pneumatic valve and butterfly valve. Cage type pneumatic 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 all kinds of pneumatic valve. Cage pneumatic 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 pneumatic valve adjustment of configuration are interchangeable. Cage pneumatic ball valve has a number of shortcomings. One is the size of the pneumatic valve limited ( Usually in inches) ; Second, with the same specifications of the line of sight of pneumatic valve ( Such as float pneumatic valve or butterfly valve) Compared to its capacity is low; Three is the selling price is higher, especially large-diameter cage pneumatic ball valve. However, in terms of reduced flow variability, cage pneumatic ball valve has excellent performance, often enough to make up for the defects. Rotary float pneumatic valve flow is greater than equal diameter cage pneumatic ball valve. Although rotary float pneumatic valve control is greater than the cage pneumatic ball valve, but it is still better than most other types of pneumatic valve. Rotary float pneumatic valve allowed pressure drop and the allowed temperature range is smaller than cage pneumatic ball valve. Often it is allowed to pressure drop. XKG/m, suitable for use at temperatures below ℃ occasions. Float pneumatic valve does not apply to easy cavitation of liquid, and used in the gas of high pressure drop, often for a larger noise. Eccentric pneumatic valve less friction than float pneumatic valve, the price is lower. Special structure design makes it for process variability control more accurate. This can be seen from the Fisher, the company's new products BV. In addition, the advantages and disadvantages of eccentric pneumatic valve and float pneumatic valve. According to the performance of the pneumatic valve, pneumatic valve butterfly belongs to low-grade pneumatic valve. Butterfly pneumatic valve flow is big, the cheapest price, and there are a number of different diameter. However, butterfly pneumatic valve characteristic curve is only a proportion of characteristic curve, this greatly limits the butterfly the performance of the pneumatic valve to reduce process variability. For this reason, butterfly pneumatic valve can only be used for fixed load situations. Although there are a number of different diameter butterfly pneumatic valve, and can be made from most of the cast alloy, but butterfly pneumatic valve does not conform to the requirements of ANSI about face-to-face dimensions, also does not apply to easy cavitation flow or large noise, etc. To sum up, adjust the dynamic characteristics of pneumatic valve and static characteristics are equally important, even more important than static characteristic, because it can determine whether the regulating pneumatic valve to meet the requirements of site condition, for we choose the more suitable for the pneumatic valve to the regulation of working conditions on site, the manufacturers and users need to close communication to achieve.
YAZE( Pneumatic company's main products: pneumatic pneumatic valve pneumatic ball valve pneumatic butterfly valve pneumatic actuator