F5-MEC-420 Flowserve 门定位器反馈单元

F5-MEC-420 Flowserve 门定位器反馈单元

F5-MEC-420 Flowserve 门定位器反馈单元

技术分析

阀门控制器由模拟电路构成．包括主汽门(MSV)、高压调门(GV)、中压调门(Ⅳ)控制器。阀门控制器根据主控制器给出的阀门开度指令调节阀开度.使阀门开度完全对应于开度指阀门处于较小位置;其输出的毫安电流信号通过电液转换器转换成油压信号后再去动作阀门。阀位的反馈信号通过位置变送器(LVDT)送回阀门控制器与输入阀位指令信号进行偏差比较。

阀位控制器系执行器的附属仪表，与各类气动调节阀配套使用，用以显示调节阀上限，下限两个工作位置。如与调节系统或事故保护系统配合应用，可实现调节系统中阀门与其他装置的相互联锁，事故状态下可显示现场调节阀的上限或下限位置。防爆等级dⅡBT4，广泛应用于自控系统中比较重要的调节回路中，是石油、化工、治金、电站、轻纺等工业部门中一种配套仪表。

阀位控制器可以与各类调节阀配套使用，用来显示调节阀行程的上限和下限。如果和控制系统或事故保护系统配套使用，可以实现控制系统中阀门的相互联锁;在事故状态时，可以显示调节阀的行程位置。因此，阀位控制器是以调节阀的行程变化来驱动控制器的微动开关并以电信号输出的一种阀位发信装置。

F5-MEC-420 Flowserve 门定位器反馈单元

Technical analysis

The valve controller is composed of analog circuit. Including main valve (MSV), high pressure regulator (GV), medium pressure regulator (Ⅳ) controller. The valve controller adjusts the valve opening according to the valve opening instruction given by the main controller. The opening of the valve corresponds exactly to the opening of the valve in a small position; The output milliampere current signal is converted into oil pressure signal by electro-hydraulic converter and then the valve is operated. The feedback signal of the valve position is sent back to the valve controller via the position transmitter (LVDT) for comparison with the input valve position instruction signal.

The valve position controller is an accessory instrument of the actuator, which is used with various pneumatic regulating valves to display the upper limit and lower limit of the regulating valve. If it is applied with the regulating system or the accident protection system, the valve in the regulating system can be interlocked with other devices, and the upper or lower limit position of the regulating valve can be displayed in the accident state. The explosion-proof grade dⅡBT4 is widely used in the more important regulation circuit in the automatic control system, and it is a supporting instrument in the industrial sectors such as petroleum, chemical industry, metallurgy, power station and textile.

The valve position controller can be used with all kinds of regulating valves to display the upper and lower limits of the regulating valve stroke. If it is used together with the control system or the accident protection system, the interlock of the valves in the control system can be realized; In the event of an accident, the travel position of the regulating valve can be displayed. Therefore, the valve position controller is a valve position signaling device that drives the microswitch of the controller with the change of the stroke of the regulating valve and outputs it with an electrical signal.