The bottom of the body designed no concave nest. So have lower flowing resistance and prevent valves leakage or damage from trash pipe up.
阀体底部设计无凹槽，球阀因此具有流阻小，阀体防止污物堆积造成阀门渗漏或损坏等特点。
The utility model discloses a combined hard alloy tappet which includes a tappet body whose one end surface is provided with a concave platform inside which is connected with a hard alloy slice.
本实用新型公开了一种组合式硬质合金挺柱，包括挺柱本体，在所 述的挺柱本体的一端面设有凹台，在所述的凹台内连接有硬质合金片。
An adhesive dike slot (31) is formed around the joint concave bottom, thus preventing the main body and the neck back side from dirtiness caused by excessive adhesive overflow.
粘合剂堤槽(31)形成在接合凹底部的周边，以防止用粘合剂连接时过量粘合剂溢出弄脏主体及琴颈的背面。
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