Normally, the cumulated water in top cover is drained to cumulated water well by gravity drainage, in emergency situation, the water would be drained by the self-priming pump installed in gallery.
顶盖内积水正常情况下通过自流排水排至积水井，紧急状态下通过装在廊道内的自吸泵排水。
The gravity of this water column continuously produces the vacuum and so a vacuum pump is not needed.
水柱的重力不断地引起真空，所以真空管是不需要的。
High head gravity flow and lead pump can be selected for conveying lead liquid, high head gravity flow can largely reduce lead residue.
铅液输出有高位自流输铅液和铅泵输铅液两种方式选择，高位自流输铅液大大降低了铅渣生成量。
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