为什么直行程调节阀阀杆较细？
有效行程区是调节阀流量调节特性所研究的区域。
The effective movement region is the research region of the flow adjusting characteristics of regulator.
如果按行程特点，调节阀可分为直行程和角行程；
If press trip characteristics, the regulator can be divided into straight travel and quarter-turn;
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