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　德国Rotork Fluid Systems是阀门执行器专家。该公司首次将菲尼克斯电气PLC logic逻辑继电器用作新的石油管道系统的控制器，灵活的操作性和紧凑的尺寸使得该继电器模块成为传统开关装置的理想替代方案。此次Rotork公司与菲尼克斯电气的合作非常成功，Rotork计划在未来将小型控制模块作为一个标准的解决方案。
要将采油/气现场的石油和天然气安全送达用户，阀门及其配套的驱动装置至关重要。作为此类设备的全球最知名制造商，Rotork提供全套的执行器、控制器和关联设备。该公司的Rotork Fluid Systems部门专门从事液压控制系统的生产和支持工作。
　　除了位于瑞典、意大利和美国的用于批量生产的生产基地之外，德国的下萨克森梅勒还是制造非串联式阀门执行器的重要基地。该公司不仅生产和销售石油和天然气管道的控制阀，同时还生产和销售水处理厂、污水处理厂、船舶和油轮的控制阀。
　　采用PLC logic逻辑继电器
　　Rotork公司最近生产了六个用于阿拉伯地区的石油管道的执行器。这些执行器首次配备了基于PLC logic逻辑继电器。液压驱动装置通过将盖板转动四分之一圈来打开和关闭阀门，阀门通过现场按钮或控制室中的无电位触点接收开关操作的命令。
　　PLC logic继电器可执行开关阀门的命令、监控泵的压力和运行时间，并进行结束位置控制。“因此，整个系统是基于PLC logic控制系统的。”德国梅勒的Rotork Fluid Systems的应用工程师Friedrich Wsteho说。
　Rotork阀门执行器是最高的安全性和可靠性的代名词。例如，可提供足够压力以安全关闭阀门的储油箱。Rotork设备的独特之处还在于其产品系列中包含适于低温(-60 °C)等特殊气候条件的驱动装置。其产品组合包括：Contactron混合型马达起动器、PSR安全继电器、MACX Analog Ex-Namur和PLC logic逻辑继电器系统，保证了Rotork设备的可靠运行，并且这些装置均来自菲尼克斯电气。整个电气设备被安装在防爆控制柜(通过Ex d认证)中，并使用大量螺栓进行固定。
　　紧凑灵活
　　Wsteho对PLC logic逻辑继电器系统的紧凑型设计感到满意。“我们曾经打算用传统继电器设备实现这些功能，但是传统设备需要占用更多现场连接器空间。其灵活性也相对欠缺，”Wsteho解释说，“使用PLC logic继电器，现在可以为各个PLC Interface模块精确分配其所需的输入和输出，系统还可以根据需要扩展附加的模块。”
　PLC logic逻辑继电器系统所能做的不仅仅是实现继电器功能。“通过使用PLC logic继电器，我们可以监控设备运行时间，甚至能为部件定时。而传统控制器占用更多的空间，并且工程方面也更为复杂。以菜单为导向的、直观可用的编程界面让初学者轻松入门，并完成初始简单项目的实施。任何了解传统继电器开关并熟悉电路图的电工都可以学习该系统，进而通过培训快速掌握。”Wsteho说。

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