控制閥選擇的重要性
Importance of control valve selection
調節(jié)閥是自動控制系統中的執(zhí)行器其應用質量直接反映了系統的調整質量
The regulating valve is the actuator in the automatic control system, and its application quality directly reflects the adjustment quality of the system
作為過程控制中的終端組件人們比過去更了解其重要性
As a terminal component in process control, people understand its importance more than in the past
調節(jié)閥的應用非常重要除了產品本身的質量外無論用戶是否正確安裝使用和維護正確計算和選擇都非常重要
The application of the regulating valve is very important. In addition to the quality of the product itself, it is very important whether the user is correctly installed, used, maintained, correctly calculated and selected
由于計算和選擇錯誤系統打開和停止有些甚至無法使用因此用戶和系統設計人員應認識到閥門在現場的重要性并且必須充分注意調節(jié)閥的選擇
Due to incorrect calculation and selection, the system can not be opened and stopped, and some even cannot be used. Therefore, users and system designers should recognize the importance of valves on site and pay full attention to the selection of control valves
控制閥選擇的原理
Principle of control valve selection
1根據工藝條件選擇合適的結構形式和材料
1 Select appropriate structure and materials according to process conditions
根據過程對象的特點選擇控制閥的流量特性
Select the flow characteristics of the control valve according to the characteristics of the process object
根據工藝操作參數選擇合適的控制閥直徑尺寸
Select appropriate diameter size of control valve according to process operation parameters
根據過程要求選擇所需的輔助設備
Select the required auxiliary equipment according to the process requirements
合理選擇執(zhí)行機構
Reasonable selection of actuator
執(zhí)行器的響應速度應該能夠滿足過程
The response speed of the actuator should meet the process
控制行程時間的要求：所選的控制閥執(zhí)行器應該能夠滿足閥門行程和泄漏水平的工藝要求
Requirements for control travel time: the selected control valve actuator shall meet the process requirements for valve travel and leakage level
在某些情況下例如選擇壓力控制閥（包括排氣閥）應考慮適當的可能壓差以進行適當的放大這需要執(zhí)行器提供大的力
In some cases, such as selecting the pressure control valve (including the exhaust valve), the appropriate possible differential pressure should be considered for proper amplification, which requires the actuator to provide a large force
否則當過程中出現異常時控制閥前后控制閥之間的實際壓差可能很大并且存在不能關閉或打開的危險
Otherwise, the actual pressure difference between the front and rear control valves of the control valve may be large and there is a risk that the valve cannot be closed or opened in case of abnormality in the process
二控制閥配件
II Control valve accessories
在生產過程中控制系統對閥門提出了各種特殊要求因此控制閥必須配備各種附件裝置（稱為附件）以滿足生產過程的需要
During the production process, the control system puts forward various special requirements for the valve, so the control valve must be equipped with various accessories (called accessories) to meet the needs of the production process
控制閥配件包括：
Control valve accessories include:
閥門定位器用于改善控制閥調節(jié)性能的工作特性實現正確的定位
The valve positioner is used to improve the working characteristics of the regulating performance of the control valve to achieve correct positioning
閥門位置開關顯示閥門上下行程的工作位置
The valve position switch shows the working position of the valve up and down travel
氣動保持閥當控制閥的氣源發(fā)生故障時在氣源發(fā)生故障之前將閥門保持在打開位置
Pneumatic holding valve When the air source of the control valve fails, keep the valve in the open position before the air source fails
電磁閥實現了氣路的電磁切換確保閥門在電源故障時閥門處于所需的安全開啟位置
The solenoid valve realizes the electromagnetic switching of the gas circuit to ensure that the valve is in the required safe opening position in case of power failure
手輪機構當控制系統的控制器發(fā)生故障時可以切換到手動模式操作閥
The handwheel mechanism can switch to manual mode to operate the valve when the controller of the control system fails
氣動繼電器可加速執(zhí)行器的動作并縮短傳動時間
The pneumatic relay can accelerate the action of the actuator and shorten the transmission time
空氣過濾器減壓器用于凈化空氣源并調節(jié)空氣壓力
The air filter pressure reducer is used to purify the air source and regulate the air pressure
儲氣罐確保當氣源發(fā)生故障時無彈簧氣缸操作器活塞致動器可將控制閥移動到故障安全位置
The air reservoir ensures that the spring-free cylinder operator piston actuator can move the control valve to the fail-safe position in case of air supply failure
它的大小取決于氣缸的大小閥門的工作時間要求和閥門的工作條件
Its size depends on the size of the cylinder, the working time requirements of the valve and the working conditions of the valve
簡而言之附件的功能是使控制閥的功能更完整更合理更完整
In short, the function of the accessory is to make the function of the control valve more complete, more reasonable and complete
三控制閥的維護
III. Maintenance of control valve
控制閥具有結構簡單運行可靠的特點但對其直接影響由于直接接觸過程介質而導致的性能
The control valve has the characteristics of simple structure and reliable operation, but it directly affects the performance caused by direct contact with the process medium
系統質量和環(huán)境污染控制閥必須經常維護和定期維修特別是在使用條件重要且重要的場合應更加注重維護工作
The system quality and environmental pollution control valve must be maintained regularly and regularly, especially when the service conditions are important and important
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