Acme Screw Threads 梯形螺纹
Manual actuator stems are single lead stub acme threads with one piece heavy duty clip welded on.
手动执行器轴是单导短梯形螺纹，带一件重型焊接夹子。
The laying length of the body and the heavy-duty modified-acme threads in the union connections to the body have not changed in the 30-year history of the valve.
这种阀门问世30多年来，其阀体长度和管套接连接件上的强力改进顶点螺纹始终没有改变。
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