Valve Positioner Benefits: Improved Accuracy and Speed

9 Reasons to Use a Control Valve Positioner

使用调节阀定位器的9个理由

A valve positioner is a control device that ensures a control valve reaches and maintains the exact position required by the control signal.

阀门定位器是一种控制装置,它能确保调节阀达到并保持控制信号所要求的精确位置.

It compares the input signal (pneumatic or electrical via I/P) with the actual valve position and supplies the necessary air to the actuator to eliminate any deviation.

它将输入信号(气动或通过电气转换器产生的电信号)与实际阀门位置进行比较,并向执行机构提供所需的气源,以消除任何偏差.

While not every application requires a positioner, many control loops benefit significantly from one—especially where accuracy, speed, and stability matter.

虽然不是每个应用都需要定位器,但许多控制回路能从中显著受益——尤其是在精度,速度和稳定性至关重要的场合.

Key advantages:

主要优势:

1️⃣ Improved accuracy

1️⃣ 提高精度

Positioners provide precise valve positioning, especially at low valve openings where control errors are common.

定位器提供精确的阀门定位,特别是在控制误差常见的低开度情况下.

2️⃣ Faster response

2️⃣ 响应更快

Higher air flow and pressure improve valve stroking speed, reducing time above or below the setpoint.

更高的气流和压力提高了阀门行程速度,减少了超出或低于设定点的时间.

3️⃣ Signal amplification

3️⃣ 信号放大

Acts as a pneumatic power amplifier, enabling the actuator to克服更高的工艺过程力.

起到气动功率放大器的作用,使执行机构能够克服更高的工艺过程力.

4️⃣ Reduced friction effects

4️⃣ 减少摩擦影响

Minimizes deadband and hysteresis caused by packing friction—critical in high-temperature services (e.g., graphite packing).

最大限度地减少由填料摩擦引起的死区和迟滞——这在高温工况(例如,石墨填料)中至关重要.

5️⃣ 4–20 mA compatibility

5️⃣ 兼容4–20 mA信号

Works with I/P converters, allowing direct integration with modern control systems.

可与电气转换器配合使用,从而直接集成到现代控制系统中.

6️⃣ Better seating control

6️⃣ 更好的阀座控制

Overcomes seating friction below ~10% stroke, enabling stable throttling near the closed position.

克服约10%行程以下的阀座摩擦力,从而能在接近关闭位置时实现稳定节流.

7️⃣ Greater flexibility

7️⃣ 灵活性更强

Supports diaphragm or piston actuators, direct/reverse action, split-range control, and modified flow characteristics.

支持隔膜式或活塞式执行机构,正/反作用,分程控制以及修正的流量特性.

8️⃣ Wider control range

8️⃣ 控制范围更宽

Essential for applications with large turndown ratios or fluids containing solids or sludge.

对于调节比要求高或介质含固体颗粒或污泥的应用至关重要.

9️⃣ Split-ranging capability

9️⃣ 分程控制能力

Allows two valves to be controlled by one signal (e.g., 4–12 mA and 12–20 mA).