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          Factors to consider when choosing pneumatic control valves
          The author: Time:2020/12/22

          氣動調節閥的選擇,主要是從下面四個方面考慮的:
          1、閥的結構:
            根據工藝要求和安全生產來決定。
          2、閥的允許壓差:
            為了避免不平衡力超出允許范圍,在選用調節閥時必須限制其工作壓差在允許壓差(△P)范圍之內,以保證執行機構的輸出力足以克服不平衡力,實現輸入佼號與閥芯位移的準確定位關系。
          3、閥的流另特性:
            流另特性是表征閥的相對開度與流過的相對流號之間的關系。典型理想流另特性,有直線、對數(等百分比),拋物線及快開四種。
          4、流通能力:
            流通能力是指調節前后壓差為1 kg/cm2及流男重度為1.0g/cm;的條件下,通過閥門的流體流另值。選擇閥時,應保證閥的流通能力大于計標值20- 30% 。

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          国产激情一区二区三区

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