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锻造调节阀TL967Y 

锻造调节阀TL967Y 

锻造调节阀TL967Y
结构
自力式压力调节阀因为不需要其它外来能源如电源、气源，仅靠介质自身的能量来驱动，既节能又环保，使用方便，安装完毕后设定好压力值即可投入自动运行，所以在对控制精度要求不高，又缺乏电源、气源的场合，得到了越来越广泛的使用。但在使用过程中，一定要注意选型的特殊性，否则容易引起事故。在使用过程中，要注意使用的选型和安装环境，因此，详细了解自力式压力调节阀的工作原理和结构是非常重要的。
特点
所谓小流量调节阀，顾名思义，就是流通能力很小的调节阀。
阀门的流通能力是在统一条件下的阀门容量指标。我国用C 值表示 。其定义为：阀门全开时，当阀前后压差为1公斤/厘米 2 ，介质重度为1克/ 厘米 3 时 ，每小时流过阀门的介质量(米 3 /时)。对于不可压缩流体，在充分湍流的状态下阀门的流通能力仅仅取决于阀本身的结构。在计算所需的阀门流通能力时，应注意介质不同或流动条件不同时， 阀内流动 状态会有很大的差异。
在小流量情况下，尤其是粘性流体和低压下工作时，流体的主约束往往是层流或层流和湍流的混合态。层流时，经过阀门的介质流量和阀前后压差呈线性关系。而在层流和湍流混合态下，随着雷诺数的增加，即使压差不变，流经阀门的介质量也会增加。在完全湍流时，流量才不随雷诺数变化而变化。尽管如此，选择小流量调节阀，仍然用传统的方法和计算公式进行。但是其计算值和实际值偏离很大，据资料介绍在 Cv=0.01以下时，它只是作为一个容量指标，具有参考意义而已。实际流通能力应根据经验确定。
随着流通能力减小，阀门的可调比将下降。但少也能保证10:l到15:1之间，如果可调比再小，就难以进行流量的调节。
阀门在串联使用时，随着开度变化，,阀前后压差也有变化，因此使阀门的工作特性曲线偏离理想特性。如果管路阻力大，直线性会变成快开特性，而丧失调节能力。等百分比特性将变成直线特性。小流量情况下，由于很少有管路阻力，上述特性畸变就不大了，对等百分比特性，实际上也就没有必要。从制造的角度来说， Cv =0.05以下时，也不可能再产生等百分比的侧面形状。因此，对小流量阀主要的问题是如何将流量控制在所需要的范围之内。

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