阀门定位器作用和用途

Function and Application of Valve Positioner

　　作用：

Function:

　　改善阀的静态特性：通过喷嘴-挡板系统及放大器的作用，阀门定位器可以克服阀杆的摩擦和消除调节阀不平衡力的影响，保证阀门位置按调节器发出的信号正确定位。

Improving the static characteristics of the valve: Through the nozzle baffle system and amplifier, the valve locator can overcome the friction of the valve stem and eliminate the impact of unbalanced force on the regulating valve, ensuring that the valve position is correctly positioned according to the signal emitted by the regulator.

　　改善阀的动态特性：减小时间常数，使阀的一阶滞后特性得到改善，提高响应速度。

Improve the dynamic characteristics of the valve: reduce the time constant, improve the first-order hysteresis characteristic of the valve, and increase the response speed.

　　改变阀的流量特性：通过改变反馈凸轮的形状，可以改变阀的线性、快开等百分比流量特性。

Changing the flow characteristics of the valve: By changing the shape of the feedback cam, the linear and fast opening percentage flow characteristics of the valve can be changed.

　　用于分程控制：在分程控制系统中，每个控制阀只能在控制器输出信号的某一区段范围内作全行程的动作，从而控制多阀功能。

Used for split range control: In a split range control system, each control valve can only perform a full stroke action within a certain range of the controller's output signal, thereby controlling the multi valve function.

　　用途：

Usage:

　　重要调节系统：提高调节阀的定位精确及可靠性。

Important regulating system: Improve the positioning accuracy and reliability of the regulating valve.

　　大压差场合：通过提高气源压力增大执行机构的输出力，克服液体对阀芯产生的不平衡力，减小行程误差。

In situations with large pressure differences: By increasing the air source pressure and increasing the output force of the actuator, the unbalanced force generated by the liquid on the valve core is overcome, and the stroke error is reduced.

　　高温、高压、低温、有毒、易燃、易爆介质：防止对外泄漏，克服阀杆与填料间的摩擦力。

High temperature, high pressure, low temperature, toxic, flammable, and explosive media: To prevent external leakage and overcome the friction between the valve stem and packing.

　　粘性流体或含固体悬浮物介质：克服介质对阀杆移动的阻力。

Viscous fluid or medium containing solid suspension: Overcoming the resistance of the medium to the movement of the valve stem.

　　大口径调节阀：增大执行机构的输出推力。

Large caliber regulating valve: Increase the output thrust of the actuator.

　　长距离控制信号传递：克服控制信号的传递滞后，改善阀门的动作反应速度。

Long distance control signal transmission: Overcoming the transmission delay of control signals and improving the action response speed of valves.

　　简介： 阀门定位器是调节阀的主要附件，通常与气动调节阀配套使用。它接受调节器的输出信号，然后以输出信号去控制气动调节阀。阀杆的位移通过机械装置反馈到阀门定位器，阀位状况通过电信号传给上位系统。

Introduction: Valve locator is the main accessory of regulating valve, usually used in conjunction with pneumatic regulating valve. It receives the output signal from the regulator and then controls the pneumatic regulating valve with the output signal. The displacement of the valve stem is fed back to the valve locator through a mechanical device, and the valve position status is transmitted to the upper system through an electrical signal.

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