This includes removing any mineral deposits around the seat beneath the valve. Also check that the pull chain attached to the valve is not too short and holding the valve slightly open.
首先，确定让水位上升的砖头或者马桶清洁装置没有挡到阀门，让它不能正确关闭；然后清除挡水阀座周围的矿质沉淀物，检查连在挡水阀的拉管是不是太短，有没有把挡水阀拉得有轻微缝隙。
Clean, adjust relief valve -, check for worn and dirty valve.
清洁，调节安全阀，检查是否有磨损和肮脏的阀门。
At present, we develop and produce the main products including butterfly valve, ball valve, check valve, gate valve and so on.
目前，开发生产的主要产品有蝶阀、球阀、止回阀、闸阀等。
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