电气阀门定位器调试方法

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原文：
　　　电气阀门定位器是气动控制阀最重要的附件之一,实现着接收控制信号准确定位阀门行程位置的作用,气动控制阀出厂时,定位器与控制阀都做过标定,但是阀门装到管线上后往往需要再进行一次标定,常规的标定方法是:标定5点即4mA,8mA,12mA,16mA,20mA,在12mA时定位器反馈杆处于水平位置,其它几组信号时阀门位置应分别在0,25%,75%,100%的行程处,且反馈杆的转动角度小于正负45度.对于零点和满度的偏差可单独调整相应螺钉进行修正,正常情况下如果阀门行程和给定信号一一对应则表示标定完成. 阀门关闭时产生的一个主要问题是如何达到使阀门严密关闭的阀座全负荷。通常的方法是对阀门进行标定，从而使闭合部件（如阀塞、隔膜、阀板等）恰好定位在阀座上，而不是确认闭合部件是否完全靠在阀座上。为了保持设计泄漏量，避免密封表面受到腐蚀，必须设计适当的密封负荷。单作用气动执行器通常都采用薄膜式设计。采用这种设计方式，使用的弹簧可以减少阀座负荷，也可以承受全部闭合压力。典型的双作用气动执行器采用活塞设计。采用这种设计方式，与薄膜式设计型不同，供应压力不需要进行限制，为了达到较高的闭合压力，可以应用全负荷供应压力。对于活塞设计型，压力越高，阀门的稳定性与控制灵敏度就越好。

“ Electropneumatic positioner debugging”是由中国气动阀门网提供的阀门行业新闻，译文仅供参考。另外，中国气动阀门网还提供相关产品搜索：气动球阀、气动蝶阀、气动闸阀、气动截止阀、气动隔膜阀等。

译文：
Electropneumatic positioner debugging Electropneumatic positioner is a pneumatic control valve is one of the most important accessories, receive control signals to achieve exact positioning of the valve stroke position of the role of the factory pneumatic control valve, control valve positioners and calibration are done, but the valve installed after the pipeline is often a need to conduct a calibration, the calibration routine is: 5-point calibration is 4mA, 8mA, 12mA, 16mA, 20mA, 12mA when the positioner feedback lever is in horizontal position, the other groups when the valve position signal should be at 0.25%, 75%, 100% of the travel office, and the rotation angle of the feedback pole is less than plus or minus 45 degrees for zero and span deviations screw can be adjusted accordingly to amend, under normal circumstances if the valve door travel and reference signals correspond to said calibration completed. Generated when the valve is closed a major problem is how to close off the valve seat full load. The usual method is to calibrate the valve, so that the closed components (eg, plug, diaphragm, valve plate, etc.) is just located in the seat, not sure parts are completely closed against the seat. In order to maintain the design leakage to avoid corrosion by sealing the surface, the load must be designed properly sealed. Single-acting pneumatic actuators are usually thin-film design. With this design approach, the use of seat can reduce the load of the spring can also be closed under all the pressure. A typical double-acting pneumatic actuator piston design. With this design approach, design and type of different film, not to restrict the supply pressure, in order to achieve higher closure pressure, supply pressure can be applied to full load. For the piston-type design, the higher the pressure, the stability and control valve sensitivity, the better.

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原文来源：http://www.1qidongfamen.com/

2011-12-27 08:41