连续控制
无论行业或应用如何，都会选择流程控制执行器，以精确和准确。他们操作控制阀，以提供只有自动化才能提供的一致性和可靠性。
Control valves are at the heart of process control: when operated by an actuator, they vary the flow of a liquid or gas in response to a variable such as flow rate, pressure or temperature. Modulating control valves are commonly used in process control systems and variable flow systems which require flow to be adjusted according to the process system’s set point requirement.
过程控制执行器提供精确的位置控制和连续调制，因此在各种应用中使用，包括化学生产，食品和饮料，采矿，电站和水位。在石油和天然气应用中，它们可以在井口，页岩气安装上的cho阀和测量泵上的中风调节器中找到。过程控制执行器提供的高度精度可以显着降低过程的变异性，从而对生产质量以及工厂所能达到的生产能力产生积极影响。
消除过程可变性
Within process control applications that use a closed loop system, process variability is an extremely undesirable behaviour. It is a large contributor to poor control loop performance and is destabilising. The greater the precision, the greater degree of control that can be exerted over the process. This creates consistency. Process control actuators adjust frequently in closed loop control applications; they must remain consistent to ensure the final target output is always achieved. An example of the importance of process consistency, as provided by actuators, is industrial combustion (for example, within glassmaking). Here, the key requirements are operational efficiency and the elimination of process variability. A standard combustion process is monitored by sensors sending signals within the control loop to ensure the process is performing as expected. An important feature of process control actuators is precise positioning performance capability. Rotork’s CVA precision modulating actuators, for example, can respond to a change in position that is almost instantaneous. Position control (using a 4 to 20 mA signal) provides up to 0.1% accuracy. For combustion, when the correct injection of fuel and air is controlled by the actuator, complete and efficient combustion is ensured. This complete combustion, producing an optimum level of heat without leaving any unburned and wasted fuel, is key to reducing emissions, saving money and meeting regulatory standards. With actuators that eliminate process variability (designed and built to be on control loop applications), process applications such as industrial combustion are truly reliable and stable. For example, CVA actuators were installed on globe valves at an Asian fibreglass manufacturerto provide accurate control of the ratio of natural gas and oxygen to melt raw glass in the furnace. The precision of the appropriate process control actuators allowed complete combustion, saving gas and oxygen.
In continual use
有许多行业和应用需要过程控制执行器，这主要是因为需要持续使用。适当的流量控制解决方案应提供连续的调节控制，该控制能够承受长时间内运行的高需求，而无需牺牲准确性和精度。调节控制不是一个简单的开/关机制，而是精确控制流速。在食品和饮料生产中，可重复的位置控制可确保可重复性和没有可变性的产品。日复一日地创建一致的最终产品是行业中的基本要求。Rotork的CVA控制阀执行器在英国韦克菲尔德的可口可乐企业网站上提供调节和故障安全职责。他们被选为从现有的气动执行器升级的一部分，以降低提供和维持空气供应的成本。执行器用于生产和清洁操作。
氢产生
在新兴能源系统中发现过程控制。全球能源提供必须从化石燃料中移开，以实现减少排放的国际目标。诸如氢之类的替代能源生产继续增长。绿色氢（由于可再生能量被喂养，仅在燃烧时释放水）（由于它被释放出来，因此被认为是完全不发射的），可以通过电解产生，这需要过程控制执行器才能精确控制。当前生产氢的成本相对较高意味着必须平稳，有效地运行生产。工艺控制执行器允许在电解过程中自动化水，氢和任何相关的碳氢化合物；这个精度是必不可少的。此类应用程序中的过程控制执行器具有爆炸性认证（例如ATEX，CSA，IECEX），以确保安全。专用过程控制解决方案对于需要连续/调节作用的应用至关重要，包括化学生产，水，食物和饮料，动力，采矿以及各种石油和天然气系统。过程控制执行器提供可重复的可靠绩效，以降低或消除过程可变性并确保一致和可靠的结果。
经过国际流程工程师杂志的允许再现。