控制阀选择的重要性
Importance of control valve selection
调节阀是自动控制系统中的执行器其应用质量直接反映了系统的调整质量
The regulating valve is the actuator in the automatic control system, and its application quality directly reflects the adjustment quality of the system
作为过程控制中的终端组件人们比过去更了解其重要性
As a terminal component in process control, people understand its importance more than in the past
调节阀的应用非常重要除了产品本身的质量外无论用户是否正确安装使用和维护正确计算和选择都非常重要
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
由于计算和选择错误系统打开和停止有些甚无法使用因此用户和系统设计人员应认识到阀门在现场的重要性并且必须充分注意调节阀的选择
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
控制阀选择的原理
Principle of control valve selection
1根据工艺条件选择合适的结构形式和材料
1 Select appropriate structure and materials according to process conditions
根据过程对象的特点选择控制阀的流量特性
Select the flow characteristics of the control valve according to the characteristics of the process object
根据工艺操作参数选择合适的控制阀直径尺寸
Select appropriate diameter size of control valve according to process operation parameters
根据过程要求选择所需的辅助设备
Select the required auxiliary equipment according to the process requirements
合理选择执行机构
Reasonable selection of actuator
执行器的响应速度应该能够满足过程
The response speed of the actuator should meet the process
控制行程时间的要求：所选的控制阀执行器应该能够满足阀门行程和泄漏水平的工艺要求
Requirements for control travel time: the selected control valve actuator shall meet the process requirements for valve travel and leakage level
在某些情况下例如选择压力控制阀（包括排气阀）应考虑适当的可能压差以进行适当的放大这需要执行器提供大的力
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
否则当过程中出现异常时控制阀前后控制阀之间的实际压差可能很大并且存在不能关闭或打开的危险
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
二控制阀配件
II Control valve accessories
在生产过程中控制系统对阀门提出了各种特殊要求因此控制阀必须配备各种附件装置（称为附件）以满足生产过程的需要
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
控制阀配件包括：
Control valve accessories include:
阀门定位器用于改善控制阀调节性能的工作特性实现正确的定位
The valve positioner is used to improve the working characteristics of the regulating performance of the control valve to achieve correct positioning
阀门位置开关显示阀门上下行程的工作位置
The valve position switch shows the working position of the valve up and down travel
气动保持阀当控制阀的气源发生故障时在气源发生故障之前将阀门保持在打开位置
Pneumatic holding valve When the air source of the control valve fails, keep the valve in the open position before the air source fails
电磁阀实现了气路的电磁切换确保阀门在电源故障时阀门处于所需的开启位置
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
手轮机构当控制系统的控制器发生故障时可以切换到手动模式操作阀
The handwheel mechanism can switch to manual mode to operate the valve when the controller of the control system fails
气动继电器可加速执行器的动作并缩短传动时间
The pneumatic relay can accelerate the action of the actuator and shorten the transmission time
空气过滤器减压器用于净化空气源并调节空气压力
The air filter pressure reducer is used to purify the air source and regulate the air pressure
储气罐确保当气源发生故障时无弹簧气缸操作器活塞致动器可将控制阀移动到故障位置
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
它的大小取决于气缸的大小阀门的工作时间要求和阀门的工作条件
Its size depends on the size of the cylinder, the working time requirements of the valve and the working conditions of the valve
简而言之附件的功能是使控制阀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
三控制阀的维护
III. Maintenance of control valve
控制阀具有结构简单运行可靠的特点但对其直接影响由于直接接触过程介质而导致的性能
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
系统质量和环境污染控制阀必须经常维护和定期维修特别是在使用条件重要且重要的场合应更加注重维护工作
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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