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恒流量调节阀是以补偿方式时行变阻力的动作，它有俩个阀瓣，一个是调节阀瓣，用于补偿节流孔前后的差压，因此可成为“补偿式变阻力调节阀”其原理是：利用节流孔前后的差压，作为补偿动作的驱动力，补偿并保持节流孔前后差压的稳定，从而保持流量的恒定，调节节流孔的大小就可获得不同的流量。因此，它既可以调节流量。也可以在系统水利工况变化时保持流量恒定，在系统中它既可恒定各个支路的流量，实现流量的均衡输配，也可以随时改变和调节各支路的流量，实现动态平衡。如果每年在初寒到严寒和严寒到末寒是进行俩次流量调节，即可实现“分阶段改变流量的质调节”的节能运行方式。恒流量调节阀的调节简单方便，但对于较大的系统来说，每年进行俩次调节仍然是个负担，而且恒流量调节阀的价格高，虽然当年可以收回，但对用户仍有较大的心理压力。

 

流量阀是由一个手动调节阀组和一个自动平衡阀组组成。调节阀组作用是设定流量，自动平衡阀组作用是维持流量恒定。系统流体的工作压力为P1，手动调节阀的前后压力分别为P2、P3。当手动调节阀调到某一位置时，即人为确定了“设定流量”Kv即手动调节阀的流量系数，流量G=Kv（P2-P3），Kv为，Kv设定后，只要P2－P3不变，则流量G不变。当系统流量增大时，(P2—P3)的实际值超过了允许的给定值，此时通过感压膜和弹簧作用使自动调节阀组自动关小，直至流量重新维持到设定流量，反之亦然。
流量阀自动调节流量的有效范围取决于工作弹簧的性能。一般流量阀前后压差在20—300kPa的范围内能按设定值有效控制流量。当压小于20kPa时，控制流量达不到设定值；压差超过300kPa时，可能产生噪音。
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力士乐平衡阀FD32KA21/B06V

按用途分为五种：
(1)节流阀：在调定节流口面积后，能使载荷压力变化不大和运动均匀性要求不高的执行元件的运动速度基本上保持稳定。节流阀是通过改变节流截面或节流长度以控制流体流量的阀门。将节流阀和单向阀并联则可组合成单向节流阀。节流阀和单向节流阀是简易的流量控制阀，在定量泵液压系统中，节流阀和溢流阀配合，可组成三种节流调速系统，即进油路节流调速系统、回油路节流调速系统和旁路节流调速系统。节流阀没有流量负反馈功能，不能补偿由负载变化所造成的速度不稳定，一般仅用于负载变化不大或对速度稳定性要求不高的场合。 
　　(2)调速阀：调速阀是进行了压力补偿的节流阀。它由定差减压阀和节流阀串联而成。节流阀前、后的压力分别引到减压阀阀芯右、左两端，当负载压力增大，于是作用在减压阀芯左端的液压力增大，阀芯右移，减压口加大，压降减小，使也增大，从而使节流阀的压差保持不变；反之亦然。这样就使调速阀的流量恒定不变。在载荷压力变化时能保持节流阀的进出口压差为定值。这样，在节流口面积调定以后，不论载荷压力如何变化，调速阀都能保持通过节流阀的流量不变，从而使执行元件的运动速度稳定。
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力士乐平衡阀FD32KA21/B06V