排气阀FV-4M1只能采用直立安装方式，因为其工作原理是以浮子垂直上下运动为基础的（参阅图3）。

The FV-4M1 should be mounted only in a vertical position as its operation is based on the vertical movement of the float (see Fig. 3).

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排气阀FV-4M1只能采用直立安装方式，因为其工作原理是以浮子垂直上下运动为基础的（参阅图3）。

The FV-4M1 should be mounted only in a vertical position as its operation is based on the vertical movement of the float (see Fig. 3).

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