一、英维思福克斯波罗 Invensys Foxboro I/A Series系统：FBM（现场输入/输出模块）顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等
二、英维思ESD系统 Invensys Triconex: 冗余容错控制系统、基于三重模件冗余（TMR）结构的*现代化的容错控制器。
三、ABB：Bailey INFI 90，工业机器人备件DSQC系列等。
四、西屋Westinghouse： OVATION系统、WDPF系统、WEStation系统备件。
五、霍尼韦尔Honeywell：DCS系统备件模件、HONEYWELL TDC系列， QCS,S9000等备件。
六、安川Yaskawa：伺服控制器、伺服马达、伺服驱动器。
七、罗克韦尔Allen Bradley Rockwell: 1/ 1785、Reliance瑞恩 等产品。
八、XYCOM：XVME-103、XVME-690、VME线等备件
九、伍德沃德Woodward：SPC阀位控制器、PEAK150数字控制器。
十、施耐德：140系列、Quantum处理器、Quantum内存卡、Quantum电源模块等。
十一、摩托罗拉Motorola：MVME 162、MVME 167、MVME1772、MVME177、VME系列。
十二、发那科FANUC：模块、卡件、驱动器等各类备件。
十三、西门子Siemens：Siemens MOORE， Siemens Simatic C1，Siemens数控系统等。
十四、博士力士乐Bosch Rexroth：Indramat，I/O模块,PLC控制器,驱动模块等。
十五、HP:工作站、服务器、HP 9000 工作站、HP 75000 系列备件、HP VXI 测试设备等。
十六、尼康NOKI：输入输出卡件、模块备件。惠普
十七、MELEC: 驱动器、驱动板、伺服驱动器、伺服控制器、马达驱动卡等。
十八、网域Network Appliance：数据储存模块。
For many years, the author has used, and promoted the use of, control valve installed flow and gain graphs as part of the control valve selection process (references 1–3). For all those years, the author has had the benefit of being associated with a valve manufacturer with a publicly available control valve-sizing application that included installed flow and gain graphing capability. Users who preferred other brands of control valves, and thus those manufacturers’ control valve-sizing applications, were hesitant to learn to use a new application to take advantage of the graphing capability.Recently, the author published an article that included detailed instructions for constructing a Microsoft Excel worksheet that generates installed flow and gain graphs in conjunction with valve-sizing calculations made with any valve-sizing application. This makes it practical for anyone to incorporate graphing installed flow and gain into their valve selection process (reference 4). This article explains how to use control valve installed gain calculations. Figure 1 is an example of a properly sized valve compared to an oversized valve. One valve manufacturer suggests the following gain criteria for installed gain within the specified flow range:
Gain > 0.5Gain <3.0As constant as possibleAs close to 1.0 as possibleGain (max) / Gain (min) <2.0.Extremely low gains are undesirable, because a low gain means when the valve moves, the flow does not change by much. It might not be as obvious why high gains are undesirable. An audio amplifier with a high gain may be desirable. But control valves are mechanical devices, and parts that move while in contact with each other tend to stick when not moving. If a valve, because it tends to stick when not moving, can only be positioned within 2% of the desired position and has a gain of 4, the flow can only be adjusted within 8% steps, which may not be desirable. The reason for limiting the gain change within the required flow range to 2:1 is so it will be easier to tune the controller for stable and fast response throughout the required flow range.
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