The screw fixing hole and the screw adjusting holes are tapered counter bores.
螺钉固定孔、螺钉调节孔为锥形沉孔。
A throttling valve core is axially provided with a small throttling hole and an adjusting hole for throttling.
节流阀芯轴向设有节流小孔和调整孔，用于节流。
Mount restrictor bar into the restrictor bar groove of upper die, mount adjusting bolt for restrictor bar into the bolt hole in the restrictor bar, then mount lower press block, upper press block.
在上模节流棒槽内装入节流棒，将节流棒调节螺栓装配进节流棒的螺丝孔中，再装配上压块。
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