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阀门定位器的作用

(Summary description)(1)改善阀的稳态特性采用阀门定位器后,只要控制器输出信号稍有变化,经过喷嘴一挡板系统及放大器的作用,就可使通往控制阀膜头的气压大有变动,以克服阀杆的摩擦和消除控制阀不平衡力的影响,从而保证阀门位置按控制器发出的信号正确定位。改善稳态特性后,能使控制阀适用于下列情况:①要求阀位作精确调整的场合;②大口径、高压差等不平衡力较大的场合;③为防止泄漏而需要将填料函压得很紧,例如高压、高温或低温等场合;④

阀门定位器的作用

(Summary description)(1)改善阀的稳态特性采用阀门定位器后,只要控制器输出信号稍有变化,经过喷嘴一挡板系统及放大器的作用,就可使通往控制阀膜头的气压大有变动,以克服阀杆的摩擦和消除控制阀不平衡力的影响,从而保证阀门位置按控制器发出的信号正确定位。改善稳态特性后,能使控制阀适用于下列情况:①要求阀位作精确调整的场合;②大口径、高压差等不平衡力较大的场合;③为防止泄漏而需要将填料函压得很紧,例如高压、高温或低温等场合;④

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  (1)改善阀的稳态特性采用阀门定位器后,只要控制器输出信号稍有变化,经过喷嘴一挡板系统及放大器的作用,就可使通往控制阀膜头的气压大有变动,以克服阀杆的摩擦和消除控制阀不平衡力的影响,从而保证阀门位置按控制器发出的信号正确定位。改善稳态特性后,能使控制阀适用于下列情况:①要求阀位作精确调整的场合;②大口径、高压差等不平衡力较大的场合;③为防止泄漏而需要将填料函压得很紧,例如高压、高温或低温等场合;④工艺介质中有固体颗粒被卡住,或是高黏滞的情况。
  (2)改善阀的动态特性定位器改变了原来阀的一阶滞后特性,减小时间常数,使之成为比例特性。一般说来,如气压传送管线超过60m时,应采用阀门定位器。
  (3)改变阀的流量特性通过改变定位器反馈凸轮的形状,可使控制阀的线性、对数、快开流量特性互换。
  (4)用于分程控制用一个控制器控制两个以上的控制阀,使它们分别在信号的某一个区段内完成全行程移动。例如,使两个控制阀分别在4——12mA直流电流及12——20mA直流电流的信号范围内完成全行程移动。
  (5)用于阀门的反向动作阀门定位器有正、反作用之分。正作用时,输入信号增大,输出气压也增大;反作用时,输入信号增大,输出气压减小。采用反作用式定位器可使气开阀变为气关阀,气关阀变为气开阀。

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The

The working principle of valve positioner

Under the advancement of technology, we have developed a valve positioner to control the equipment in order to work more accurately. The valve positioner can be used in conjunction with various equipment. Using the valve positioner, we can understand a signal of the adjustment output in the equipment, so as to realize the control of the equipment. Although the use of valve positioners is very common in our lives, many people do not know much about the structure and working principle of valve positioners. Let's take a look at the working principle of the valve positioner together.
2020-01-19
Leaders

Leaders and technical experts from China National Offshore Oil Corporation visited Wuhan Tuoyou Intelligent Co., Ltd

On October 10th, leaders and technical experts from China National Offshore Oil Corporation (hereinafter referred to as CNOOC) visited Wuhan Tuoyou Intelligent Co., Ltd. to conduct research and technical exchanges on the application of TORLEO intelligent valve positioner in offshore operation platform.
2023-10-27

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