丹佛斯双联柱塞泵 工作原理：丹佛斯双联柱塞泵将两个相同形状的圆柱塞入两个相同形状的泵腔内，并在泵腔内通过不同位置对柱塞产生力矩，而使泵出口具有一定的压力并能提供更大限度的动力，这就是泵的工作原理当柱塞不能按设计规定的压力运行时（可根据实际情况）可以按以下几种原因停机：泵不出油：柱塞密封圈老化和堵塞引起回位或损坏；压力低；油量不足；泵内有异物；润滑不良；密封圈损坏或严重漏油；泵壳、齿轮磨损严重。
停机时将泵放入油箱内；待压力升高后开始泵工作；此时压力降增大；泵内压力保持不变，当压力降到一定程度时真空泵突然启动泵内压力突然升高或下降；发动机停机时排出柱塞泵内压力持续下降直到不能继续下降；柱塞突然停止动作甚至无法动作；无法继续泵注；突然停机；压力升至正常值；压力恢复正常后；发动机起动困难或突然停止泵时；由于泵腔内充满气体或油液，而不能排出时（此时发动机空载运转）可能造成轴承严重损坏以及机械零部件损坏。
在工作过程中，当油缸间隙过大时容易造成液压缸回路堵塞，液压缸阻力增大，液压缸行程变短，液压系统工作压力降低液压缸间隙过大时，造成液压缸活塞杆弯曲、磨损、轴向窜动和油路漏油，使液压缸受到污染而产生泄漏，导致缸间隙过大或超过要求密封间隙。
若液压缸间隙过大，不能达到规定的密封要求时，应拆下密封垫片更换；若液压缸间隙过大，缸内压降增大，使缸体受力变大，引起活塞杆弯曲、轴向窜动和油路漏油，使液压缸受到污染并产生泄漏，导致液压系统发生泄漏；若液压缸间隙过大，但活塞杆仍能保持在规定位置上或不会向外窜动，则说明有缸孔堵塞或弹簧折断；若压力不足时，在工作过程中可突然切断动力而使其停止工作；若高压液压缸间隙过大，不引起油压下降和压力升高而造成油缸压伤或拉伤；若压力下降幅度大且稳定不变时，可说明高压缸严重损坏。
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