閥門(mén)放大器工作原理
氣動(dòng)放大器再現(xiàn)具有更高調(diào)節(jié)流量輸出壓力的低流量控制信號(hào)。它使用未調(diào)節(jié)的輸入壓力在流動(dòng)和非流動(dòng)條件下保持調(diào)節(jié)的輸出壓力。
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.
放大器連接到供應(yīng)線(xiàn)和輸出管道。然而，它接收來(lái)自另一個(gè)設(shè)備的氣動(dòng)控制信號(hào)，例如傳感器、閥門(mén)定位器或其他控制裝置。
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.
該氣動(dòng)信號(hào)控制進(jìn)出增壓器的壓力，同時(shí)允許增壓器流過(guò)供應(yīng)管線(xiàn)的最大體積。增壓器也可以稱(chēng)為先導(dǎo)式調(diào)節(jié)器，因?yàn)槟目刂苹蛳葘?dǎo)信號(hào)保持壓力控制。
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.
氣動(dòng)風(fēng)量增壓器的調(diào)節(jié)輸出可以是以下任何一種：
氣動(dòng)控制信號(hào)的直接再現(xiàn)
氣動(dòng)控制信號(hào)的倍數(shù)
一小部分氣動(dòng)控制信號(hào)
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
體積增壓比是信號(hào)壓力到輸出壓力的倍增器或分壓器。例如，2:1 的比率意味著輸出壓力是信號(hào)壓力的 1/2。同樣，2:1 的比例將提供兩倍于信號(hào)壓力的輸出壓力。但是請(qǐng)注意，輸出壓力永遠(yuǎn)不能超過(guò)增壓器的供應(yīng)壓力。
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.
信號(hào)壓力通常低于供氣壓力，因?yàn)榭刂蒲b置（閥門(mén)定位器、I/P 等）只能處理較低的供氣壓力。
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.
放大器用于提高沖程速度。如果需要精確的閥門(mén)控制，建議使用定位器。如果要使用體積增壓機(jī)進(jìn)行開(kāi)/關(guān)控制，則必須關(guān)閉增壓器上的整體旁路限制。
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.
閥門(mén)放大器 Volume Booster
放大器用于氣動(dòng)控制系統(tǒng)，將低流量信號(hào)傳遞為具有更大流量的信號(hào)。常見(jiàn)的配置是在輸入和輸出壓力之間提供 1:1 的比例，保持輸入和輸出信號(hào)的壓力相同。提供不同比例的產(chǎn)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.
容積增壓器的一般用途是在低流量系統(tǒng)和高流量要求系統(tǒng)之間提供繼電器。
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.
一個(gè)典型的例子是氣動(dòng)執(zhí)行器。通過(guò)氣動(dòng)信號(hào)線(xiàn)可用的流量可能不足以提供氣動(dòng)致動(dòng)器所需的響應(yīng)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.
容積增壓器可控制獨(dú)立的空氣供應(yīng)，通過(guò)在與控制信號(hào)相同的壓力下增加流量來(lái)解決這一難題。
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.
放大器操作簡(jiǎn)單。輸入信號(hào)向隔膜的一側(cè)施加力，向另一側(cè)施加輸出壓力。
Volume boosters are simple in operation. The input signal applies force to one side of a diaphragm, the output pressure to the other.
兩個(gè)施加壓力之間的不平衡將導(dǎo)致隔膜移動(dòng)，改變閥門(mén)的位置和出口壓力，直到兩個(gè)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.
當(dāng)設(shè)備安裝正確且供應(yīng)空氣質(zhì)量良好時(shí)，幾乎不需要維護(hù)。
Little maintenance is required when the units are properly installed and supply air is of good quality.
操作原理 Principle of Operation
圖1. Volume Booster 的剖面圖
Figure 1. Sectional View of Volume Booster
圖2. 機(jī)械安裝
Figure 2. Typical Installstions
請(qǐng)參閱圖 1 和圖 2，由于旁路限制，大輸入信號(hào)在增壓器輸入膜片上的寄存器變化比在執(zhí)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.
輸入信號(hào)的大而突然的變化導(dǎo)致輸入信號(hào)和增壓器的輸出之間存在壓力差。
A large, sudden change in input signal causes a pressure differential to exist between the input signal and the output of the booster.
當(dāng)發(fā)生這種情況時(shí)，隔膜移動(dòng)以打開(kāi)供氣口或排氣口，無(wú)論需要采取哪種行動(dòng)來(lái)減小差值。
When this occurs, the diaphragms move to open either the supply port or the exhaust port, whichever action is required to reduce the differential.
該端口保持打開(kāi)狀態(tài)，直到增壓器輸入和輸出壓力之間的差值回到增壓器的死區(qū)限制內(nèi)。
The port remains open until the difference between the booster input and output pressures returns to within the deadband limit of the booster.
為穩(wěn)定運(yùn)行調(diào)整旁路限制后，幅度和速率變化較小的信號(hào)通過(guò)旁路限制進(jìn)入執(zhí)行器，而無(wú)需啟動(dòng)增壓器操作。
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.
供氣口和排氣口都保持關(guān)閉，防止不必要的空氣消耗和定位器繼電器可能的飽和。
Both supply and exhaust ports remain closed, preventing unnecessary air consumption and possible saturation of positioner relays.
好處 ：
快速響應(yīng)，提高執(zhí)行器行程速度
在高行程速度下保持正確的執(zhí)行器定位
可調(diào)節(jié)旁通閥提供良好的操作靈敏度
高穩(wěn)定性，允許正常的慢速執(zhí)行器響應(yīng)慢速信號(hào)變化
能夠使用高壓工廠供氣
提供不同的放大器尺寸，以適應(yīng)各種執(zhí)行器尺寸
主內(nèi)部供氣閥，帶軟閥座插件，用于緊密關(guān)閉
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
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