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　德國Rotork Fluid Systems是閥門執行器專家。該公司首次將菲尼克斯電氣PLC logic邏輯繼電器用作新的石油管道系統的控制器，靈活的操作性和緊湊的尺寸使得該繼電器模塊成為傳統開關裝置的理想替代方案。此次Rotork公司與菲尼克斯電氣的合作非常成功，Rotork計劃在未來將小型控制模塊作為一個標準的解決方案。
要將采油/氣現場的石油和天然氣安全送達用戶，閥門及其配套的驅動裝置至關重要。作為此類設備的全球最知名制造商，Rotork提供全套的執行器、控制器和關聯設備。該公司的Rotork Fluid Systems部門專門從事液壓控制系統的生產和支持工作。
　　除了位于瑞典、意大利和美國的用于批量生產的生產基地之外，德國的下薩克森梅勒還是制造非串聯式閥門執行器的重要基地。該公司不僅生產和銷售石油和天然氣管道的控制閥，同時還生產和銷售水處理廠、污水處理廠、船舶和油輪的控制閥。
　　采用PLC logic邏輯繼電器
　　Rotork公司最近生產了六個用于阿拉伯地區的石油管道的執行器。這些執行器首次配備了基于PLC logic邏輯繼電器。液壓驅動裝置通過將蓋板轉動四分之一圈來打開和關閉閥門，閥門通過現場按鈕或控制室中的無電位觸點接收開關操作的命令。
　　PLC logic繼電器可執行開關閥門的命令、監控泵的壓力和運行時間，并進行結束位置控制。“因此，整個系統是基于PLC logic控制系統的。”德國梅勒的Rotork Fluid Systems的應用工程師Friedrich Wsteho說。
　Rotork閥門執行器是最高的安全性和可靠性的代名詞。例如，可提供足夠壓力以安全關閉閥門的儲油箱。Rotork設備的獨特之處還在于其產品系列中包含適于低溫(-60 °C)等特殊氣候條件的驅動裝置。其產品組合包括：Contactron混合型馬達起動器、PSR安全繼電器、MACX Analog Ex-Namur和PLC logic邏輯繼電器系統，保證了Rotork設備的可靠運行，并且這些裝置均來自菲尼克斯電氣。整個電氣設備被安裝在防爆控制柜(通過Ex d認證)中，并使用大量螺栓進行固定。
　　緊湊靈活
　　Wsteho對PLC logic邏輯繼電器系統的緊湊型設計感到滿意。“我們曾經打算用傳統繼電器設備實現這些功能，但是傳統設備需要占用更多現場連接器空間。其靈活性也相對欠缺，”Wsteho解釋說，“使用PLC logic繼電器，現在可以為各個PLC Interface模塊精確分配其所需的輸入和輸出，系統還可以根據需要擴展附加的模塊。”
　PLC logic邏輯繼電器系統所能做的不僅僅是實現繼電器功能。“通過使用PLC logic繼電器，我們可以監控設備運行時間，甚至能為部件定時。而傳統控制器占用更多的空間，并且工程方面也更為復雜。以菜單為導向的、直觀可用的編程界面讓初學者輕松入門，并完成初始簡單項目的實施。任何了解傳統繼電器開關并熟悉電路圖的電工都可以學習該系統，進而通過培訓快速掌握。”Wsteho說。

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