出油阀在弹簧和高压油管中油压的作用下落回阀座，喷油器立即停止喷油。这时虽然柱塞仍继续上行，但供油已终止。 柱塞套上回油孔被柱塞斜边打开的时刻称为理论供油终点。在柱塞向上运动的整个过程中，只是中间一段行程才是压油过程，这一行程称为柱塞的有效行程
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一八七七一零二二八二九
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