阀门放大器工作原理

气动放大器再现具有更高调节流量输出压力的低流量控制信号。它使用未调节的输入压力在流动和非流动条件下保持调节的输出压力。

A pneumatic air volume booster reproduce a low flow control signal with a higher regulated flow output pressure. It uses an unregulated input pressure to maintain a regulated output pressure under flowing and non-flowing conditions.

放大器连接到供应线和输出管道。然而，它接收来自另一个设备的气动控制信号，例如传感器、阀门定位器或其他控制装置。

The volume booster is connected to the supply line and the output plumbing. It receives a pneumatic control signal, however, from another device, such as a transducer, valve positioner or other control means.

该气动信号控制进出增压器的压力，同时允许增压器流过供应管线的最大体积。增压器也可以称为先导式调节器，因为您的控制或先导信号保持压力控制。

This pneumatic signal controls the pressure into and out of the booster, while allowing the booster to flow the maximum volume of the supply line. Boosters may also be referred to as pilot-operated regulators, as your control or pilot signal maintains the pressure control.

气动风量增压器的调节输出可以是以下任何一种：

气动控制信号的直接再现

气动控制信号的倍数

一小部分气动控制信号

The regulated output of a pneumatic air volume booster can be any of the following:

A direct reproduction of the pneumatic control signal

A multiple of the pneumatic control signal

A fraction of the pneumatic control signal

体积增压比是信号压力到输出压力的倍增器或分压器。例如，2:1 的比率意味着输出压力是信号压力的 1/2。同样，2:1 的比例将提供两倍于信号压力的输出压力。但是请注意，输出压力永远不能超过增压器的供应压力。

The volume booster ratio is the multiplier or divider of signal pressure to output pressure. For example, a 2:1 ratio means output pressure is 1/2 the signal pressure. Similarly, a 2:1 ratio would provide output pressure twice the signal pressure. Note, however, the output pressure can never exceed the supply pressure to the booster.

信号压力通常低于供气压力，因为控制装置（阀门定位器、I/P 等）只能处理较低的供气压力。

Often the signal pressure is lower than the supply pressure because a control device (valve positioner, I/P, etc.) will only handle a lower supply pressure.

放大器用于提高冲程速度。如果需要精确的阀门控制，建议使用定位器。如果要使用体积增压机进行开/关控制，则必须关闭增压器上的整体旁路限制。

The volume booster is used to improve stroking speed. If precision valve control is required, the use of a positioner is recommended. If the volume booster is to be used for on/off control, the integral bypass restriction on the booster must be closed.

放大器用于气动控制系统，将低流量信号传递为具有更大流量的信号。常见的配置是在输入和输出压力之间提供 1:1 的比例，保持输入和输出信号的压力相同。提供不同比例的产品。

A volume booster is used in a pneumatic control system to relay a low flow signal as one with greater flow volume. The common configuration is to provide a 1:1 ratio between the input and output pressure, keeping the input and output signals the same pressure. Products are available that deliver different ratios.

容积增压器的一般用途是在低流量系统和高流量要求系统之间提供继电器。

The general purpose of a volume booster is to provide a relay between a system with low flow volume and one with higher volume requirements.

一个典型的例子是气动执行器。通过气动信号线可用的流量可能不足以提供气动致动器所需的响应速度。

A typical example is a pneumatic actuator. The flow available through the pneumatic signal line may be insufficient to deliver the response rate desired from the pneumatic actuator.

容积增压器可控制独立的空气供应，通过在与控制信号相同的压力下增加流量来解决这一难题。

A volume booster, with control over an independent air supply, solves this challenge with increased flow volume at the same pressure as the control signal.

放大器操作简单。输入信号向隔膜的一侧施加力，向另一侧施加输出压力。

Volume boosters are simple in operation. The input signal applies force to one side of a diaphragm, the output pressure to the other.

两个施加压力之间的不平衡将导致隔膜移动，改变阀门的位置和出口压力，直到两个力再次平衡。

An imbalance between the two applied pressures will cause the diaphragm to move, changing the position of the valve and the outlet pressure until the two forces are again in balance.

当设备安装正确且供应空气质量良好时，几乎不需要维护。

Little maintenance is required when the units are properly installed and supply air is of good quality.

图1. Volume Booster 的剖面图

Figure 1. Sectional View of Volume Booster

图2. 机械安装

Figure 2. Typical Installstions

请参阅图 1 和图 2，由于旁路限制，大输入信号在增压器输入膜片上的寄存器变化比在执行器中更快。

Refer to figures 1 and 2. Because of the bypass restriction, large input signal changes register on the booster input diaphragm sooner than in the actuator.

输入信号的大而突然的变化导致输入信号和增压器的输出之间存在压力差。

A large, sudden change in input signal causes a pressure differential to exist between the input signal and the output of the booster.

当发生这种情况时，隔膜移动以打开供气口或排气口，无论需要采取哪种行动来减小差值。

When this occurs, the diaphragms move to open either the supply port or the exhaust port, whichever action is required to reduce the differential.

该端口保持打开状态，直到增压器输入和输出压力之间的差值回到增压器的死区限制内。

The port remains open until the difference between the booster input and output pressures returns to within the deadband limit of the booster.

为稳定运行调整旁路限制后，幅度和速率变化较小的信号通过旁路限制进入执行器，而无需启动增压器操作。

With the bypass restriction adjusted for stable operation, a signal with small magnitude and rate changes passes through the bypass restriction and into the actuator without initiating booster operation.

供气口和排气口都保持关闭，防止不必要的空气消耗和定位器继电器可能的饱和。

Both supply and exhaust ports remain closed, preventing unnecessary air consumption and possible saturation of positioner relays.

好处 ：

快速响应，提高执行器行程速度

在高行程速度下保持正确的执行器定位

可调节旁通阀提供良好的操作灵敏度

高稳定性，允许正常的慢速执行器响应慢速信号变化

能够使用高压工厂供气

提供不同的放大器尺寸，以适应各种执行器尺寸

主内部供气阀，带软阀座插件，用于紧密关闭

Advantages :

Quick response with increeased actuator stroking speeds

Maintains correct actuator postioning at high stroking speeds

Adjustable by pass valve provides good operational sensitivity

High stability which allow normal slow actuator response to slow signal changes

Capable of using high pressure plant air supply

Different Booster sizes available to suit wide range of actuator sizes

Main internal air supply valve with Soft seat insert for tight shut off