左右两侧的两个大孔，分别表示进气阀孔和排气阀孔。
The large holes on the left and right represent the inlet and exhausting valve ports respectively.
全套管道孔板、阀门、法兰及反法兰、紧固件及其它所有附件，所有放水、放气阀门及安全阀。
Full set of pipe orifice, valves, flanges and counter flanges, fasteners and all other attachments, all water release valves, gas release valves and safety valves.
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