| 摘要 |
<p>PURPOSE:To prevent the generation of stress concentration in the vicinity of the discharge port of an under plate by forming the under plate in a condition of floating up from a valve plate. CONSTITUTION:When the load of a discharge valve 7 is applied to a discharge port 6, the portion between the discharge port 6 and vent holes 9 of an under plate 8 which is hitherto in a floated up condition from the surface of a valve plate 3 is pressed against the valve plate 3 due to the load of the discharge valve 7. At this time, the whole of the under plate 8 between the discharge port 6 and the vent holes 9 is uniformly brought into pressure contact with the valve plate 3. Hence, when the load of the discharge valve 7 is applied, the rubber layer 8b of the under plate 8 around the discharge port 6 bears the load of the discharge valve 8 by the whole face thereof.</p> |
