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插装阀和其阀孔的设计 通用性的重要性在于大批量生产。就某一种规格的插装阀为例，为了 批量生产，其阀口的尺寸是统一的。此外，不同功能的阀可采用同一规格阀腔，例如：单向阀、锥阀、流量调节阀、节流阀、两位电磁阀等等。如果同一规格、不同功能的阀无法采用不同阀体，那么阀块的加工成本势必增加，插装阀的优势就不复存在。
溢流阀的特性曲线溢流阀的开启压力o当阀入口压力小于PK1时,阀处于关闭状态,其过流量为零；当阀入口压力大于k1时,阀开启、溢流,直动式溢流阀便处于工作状态(溢流的同时定压)。图中pb是先导式溢流阀的导阀开启压力,曲线上的拐点m所对应的压力pm是其主阀的开启压力。当压力小于民时，导阀关闭,阀的流量为零；当压力大于pb(小于此2)时,导阀开启,此时通过阀的流量只是先导阀的泄漏量,故很小,曲线上pbm段即为导阀的工作段；当阀入口压力大于此2时,主阀打开,开始溢流,先导式溢流阀便进入工作状态。在工作状态下,元论是直动式还是先导式溢流阀,其溢流量都是随人口压力增加而增加,当压力增加到丸z时,阀芯上升到***位置,阀口***,通过溢流阀的流量也***一为其额定流量毡,这时入口的压力pn叫做溢流阀的调定压力或全流压力。
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