高阀的开启压力，保证阀工作稳定，不过，D值过大，将使阀的结构尺寸和阀芯质量加大，主阀上腔容积增加，导致动态过程时间延长，
太小又保证不了静态特性要求，一般应保证：
4、主阀芯半锥角α1
5、主阀芯阻尼孔d0及长度l0
主阀芯上阻尼孔d0
越小，其长度l0越长，
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