气动薄膜调节阀方案

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原文：
气动薄膜调节阀方案（调节阀配用电－气阀门定位器）本方案主要由气动调节阀、电－气阀门定位器、失电（信号）比较器、单电控电磁换向阀、气动保位阀、阀位信号返回器等组成。其工作原理如下： 1、断气源：当控制系统气源故障（失气）时，气动保位阀自动关闭将定位器的输出信号压力锁定在气动控制阀的膜室内，输出信号压力与控制阀弹簧产生的反力相平衡，气动控制阀的阀位保持在故障位置。该保位阀应设定在略低于气源的最小值时启动。 2、断电源：当控制系统电源故障（失电）时，失电（信号）比较器控制单电控电磁换向阀的输出电压消失，单电控电磁换向阀失电，单电控电磁换向阀内的滑阀在复位弹簧的作用下滑动，电磁阀换向，将气动保位阀的膜室压力排空，气动保位阀关闭，将定位器的输出信号压力锁定在气动控制阀的膜室内，输出信号压力与控制阀弹簧产生的反力相平衡，气动控制阀的阀位保持在故障位置。 3、断信号：当控制系统信号故障（失信号）时，失电（信号）比较器检测到后，断掉单电控电磁换向阀的电压信号，单电控电磁换向阀失电，单电控电磁换向阀内的滑阀在复位弹簧的作用下滑动，电磁阀换向，将气动保位阀的膜室压力排空，气动保位阀关闭，将定位器的输出信号压力锁定在气动控制阀的膜室内，输出信号压力与控制阀弹簧产生的反力相平衡，气动控制阀的阀位保持在故障位置。位置反馈信号由阀位信号返回器给出。本方案的优点：“三断”保护启动时，系统反应较快，动作迅速。整体造价比较便宜。本方案的缺点：电磁阀长期带电，影响使用寿命。配用附件较多，安装、调试复杂一些，阀位反馈需另配阀位信号返回器，在配用手轮的情况下，比较复杂。　

“ Pneumatic control valve membrane solution"是由中国调节阀网提供的国际阀门新闻，译文仅供参考。另外，中国调节阀网还提供相关产品搜索： CV3000调节阀、电动调节阀、执行器和附件、更多调节阀产品、调节阀价格等。

译文：
Pneumatic control valve membrane solution (control valve with electric - gas valve positioner) The program mainly by the pneumatic control valve, electric - gas valve positioner, loss of power (signal) comparator, a single electronic control solenoid valve, pneumatic protect a valve, the valve position signal to return and other components. It works as follows: 1, cut off the gas source: When the air control system failure (loss of gas), the pneumatic valve automatically shut down to protect digital output signal locator lock pneumatic pressure control valve membrane interior, the output signal pressure control valve spring reaction force generated by balance, pneumatic control valve position to maintain the fault location. The valve should be set to secure his position slightly lower than the minimum air start. 2, off the power: When the control system power failure (power failure), the loss of power (signal) compared to control single solenoid valve solenoid output voltage disappears, electronically controlled solenoid valve single loss of power, a single electronic control electromagnetic valve within the spool valve return spring under the action of the slide, reversing valve, the valve membrane to secure his position pneumatic pressure chamber emptying, pneumatic valve closure to secure his position, the positioning of the output signal pressure in the pneumatic control valve lock membrane interior, the output signal pressure control valve spring reaction force generated by balanced, pneumatic control valve position to maintain the fault location. 3, off the signal: when the control signal failure (loss of signal), the loss of power (signal) detected by the comparator, the broken single electronic control solenoid valve voltage signal, a single electronic control solenoid valve de-energized, single solenoid valve solenoid valve inside the slide under the action of the reset spring slide, reversing valve, the valve membrane to secure his position pneumatic pressure chamber emptying, pneumatic valve closure to secure his position, the positioning of the output signal pressure lock In the pneumatic control valve membrane interior, the output signal pressure control valve spring reaction force generated by balanced, pneumatic control valve position to maintain the fault location. Position feedback signal from the control valve position signal to return is given. The advantage of this program: "Three off" protection starts, faster system response and prompt action. Overall cost is cheaper. The disadvantage of this program: long-term electric solenoid valve, affecting life. Equipped with more accessories, installation, commissioning more complex, valve position feedback signals need to reprovision return valve device, with a hand wheel in the case more complicated.

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原文来源：http://www.1tiaojiefa.com/

2011-12-29 07:33