凸面阀座。阀座周围的槽将颗粒收集起来，并排挤到闸刀旁边，以避免出现堵塞。当阀门开启时，流体介质压力就会清洗槽内的颗粒。
Raised-face seat. A groove around the seat collects particles pushed aside by the knife and prevents clogging. When the valve opens, media pressure cleans the groove.
在传输大文件或者网络很堵塞的情况下，有时候不可避免地会出现FTP失败，文件只传输了一部分。
When transferring large files or transferring files over networks that suffer from outages, it is inevitable that at some point you will get a failed FTP, with the file partially transferred.
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