DBETE-5X/100G24Z31M
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DBETE-5X/100G24Z31M
按公式(1)估算出的孔道直径应园整至标准的通径值。
7.当主级孔道与多个插件贯通时，为减小贯通处的局部流阻损失，宜采用与插件孔偏贯通的方法(使主级孔道的中心线与插件孔的中心线偏移)。一般使主级孔道中心线与插件孔孔壁相切。也可以加大孔道通径，加大的通径应不超过GB2877的规定。
8.为改善深孔工艺性，设计时可考虑增大孔径或采用两端钻孔对接的方法。
9.设计时应尽量避免在阀块体内设置复杂连接的控制孔道和三维斜孔，应充分利用控制盖板内的控制孔道，或采用先导控制块等专用的控制孔道连接体。先导孔道的直径应与GB2877的规定一致。若因工艺需要而减小先导孔道的直径时，应作验算，确认不至影响对主级阀的控制要求。
10. 应避免采用倾斜孔道。必须倾斜时，孔道的倾斜角度应不超过35°，并须保证孔口的密封良好。对主级斜孔，应在有关视图上标注出因斜孔加工而造成的椭园孔口的长轴尺寸。
11. 当较小孔道孔径不大于25mm时，两相邻孔道孔壁之间的距离应不小于5mm;较小孔道孔径大于25mm时，两相邻孔道孔壁之间的距离应不小于10mm。
12. 为避免污染物的沉积，对于相通的孔道，孔深一般应到与之相通的孔道的中心线为止。
13.主级孔道的外接油口一般采用法兰连接。对于通径为25mm以下的较小油口，也可采用螺纹连接。先导孔道的外接油口宜采用螺纹连接。
14. 工艺孔道应采用螺塞、法兰等可拆方式封堵，以便孔道的清理、清洗和检查。螺塞的螺纹应符合GB2878的规定。在位置不允许时，对直径不大于12mm的孔道，允许采用球涨式堵头封堵。
DBETE-5X/100G24Z31M
