Seat Face: Negates need for flange gaskets.
阀座：需使阀兰垫圈。
Flange gaskets are not interchangeable with other mechanical pipe couplings or flange gaskets.
法兰垫圈与其它机械管道连接器或法兰垫圈互换。
Tightness test both the shell and tube sides of the exchanger to check that the flange gaskets are holding tight.
紧力测试对热交换器的管程与壳程，检查法兰垫圈是否紧密。
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