| 摘要 |
A safety air valve of a receiving bag includes an upper valve body, a valve seat and a valve gate. The upper valve body is installed inside the receiving bag. A first thread is formed at the protrusion stayed closely to the interior of the receiving bag. The first thread penetrates out the receiving bag; and a first main air channel is formed in the bottom of the first thread penetrating into the receiving bag so as to form a stepped valve opening on the top of the first main air channel. A second thread is formed at the valve seat corresponding to the first thread of the upper valve body. The second thread is screwed into the first thread and is positioned at the outer side of the receiving bag. The second thread has a press body corresponding to a first main air channel of the upper valve body.
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