ValveBreakage. Any condition that causes the valve to overheat or to be subjected to heavy pounding (as from excessive tappet clearance or from detonation ) may cause valves to Break.
气门过热或遭受重载（气门杆间隙过大或爆裂）均可造成气门破裂。
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The effects of micro-hole valve of homogenizer on bacteria's surface structure showed cell wall friction damage and cell membrane breakage.