If the valve seat diameter is not known, the port diameter can be assumed to be the seat diameter for estimating purposes.
阀门阀座直径。如果不知道阀门阀座的直径，则可以将端口直径作为阀座直径进行估算。
If the valve seat diameter is not known, the port diameter can be assumed to be the seat diameter for estimating purposes.
阀门阀座直径。如果不知道阀门阀座的直径，则可以将端口直径作为阀座直径进行估算。
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