The hole in the working gate in the export of tunnel usually decorate, working gate often moving water requirements of opening and closing, often in static water maintenance gate opening and closing.
有压洞的工作闸门通常布置在隧洞的出口，工作闸门要求常在动水中启闭，检修闸门常在静水中启闭。
2
The durable design of our hole punch Cylinder enables you to punch millions of maintenance-free holes.
我们的孔冲气缸耐用的设计使您能够以百万计的维修打孔无漏洞。
3
The utility model has the advantages of stable working condition, high drill hole precision, convenient maintenance, easy manufacture and wide application range.