| 摘要 |
<p>The automatic valve comprises a valve seat (52) with first gas flow passages (58) extending there through, and a valve guard (54) having second gas flow passages (66) extending there through. Sealing rings (60) are arranged between the valve guard and the valve seat. A removable seat plate (68) is removably connected to the valve seat (52) and is provided with apertures (70) matching with the first gas flow passages (58) of the valve seat. The sealing rings are resiliently biased by resilient members (62) against the removable seat plate (68) to close the valve. The seat plate and the rings are made of non-metallic material.</p> |
