In recent years, people have been considering some traditional factors when choosing control valves, such as pressure rating, pressure drop, flow medium, temperature, and cost. However, in the past 10 years, the situation has undergone significant changes, with great progress made in the design of Lianggong valves. The cost-effectiveness characteristics of the production process are greatly different from before, greatly weakening the importance of many traditional factors that must be considered when selecting valves.

虽然一些传统因素仍然很重要，但它们只关注良工阀门“静态"性能。事实上，他们在这里。“工作台"阀门测量的结果很难说明阀门在实际运行条件下会表现出什么样的性能。传统理论认为，仔细调整静态因素会使阀门（从而使整个电路）获得良好的性能。然而，现在我们意识到情况并不总是如此。

Although some traditional factors are still important, they only focus on the "static" performance of high-quality valves. In fact, they are here. The results of "workbench" valve measurements are difficult to explain what kind of performance the valve will exhibit under actual operating conditions. Traditional theory suggests that carefully adjusting static factors can achieve good performance of the valve (and thus the entire circuit). However, now we realize that this is not always the case.

研究人员和制造商进行的成千上万次性能检查证明，多达50%的阀门（其中许多是通过考虑传统因素选择的）对优化控制电路的性能没有太大影响。后续研究表明，阀门的动态特性在降低工艺变性方面发挥着重要作用。在许多关键过程中，即使不同良工阀门降低工艺变性的幅度相差1%，也能大大提高生产效率，减少废物，从而达到100多万美元的经济效益。显然，这种经济效益使我们能够完全否认传统的做法，即只根据阀门的初始购买来决定是否购买。

Thousands of performance checks conducted by researchers and manufacturers have shown that up to 50% of valves, many of which were selected by considering traditional factors, have little impact on the performance of optimized control circuits. Subsequent studies have shown that the dynamic characteristics of valves play an important role in reducing process variability. In many key processes, even if the reduction of process variability varies by 1% among different skilled valves, it can greatly improve production efficiency, reduce waste, and achieve economic benefits of over $1 million. Obviously, this economic benefit enables us to completely deny the traditional practice of deciding whether to purchase based solely on the initial purchase price of the valve.

其次，传统观点总是认为，过程优化的改进总是来自于控制室控制仪器的升级。然而，测试数据表明，在使用相同控制仪器的情况下，阀门的动态特性对电路性能有显著影响。

Secondly, the traditional view always holds that the improvement of process optimization always comes from the upgrading of control instruments in the control room. However, test data shows that the dynamic characteristics of the valve have a significant impact on circuit performance when using the same control instrument.

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