?丹佛斯雙聯柱塞泵 工作原理：丹佛斯雙聯柱塞泵將兩個相同形狀的圓柱塞入兩個相同形狀的泵腔內，并在泵腔內通過不同位置對柱塞產生力矩，而使泵出口具有一定的壓力并能提供更大限度的動力，這就是泵的工作原理當柱塞不能按設計規定的壓力運行時（可根據實際情況）可以按以下幾種原因停機：泵不出油：柱塞密封圈老化和堵塞引起回位或損壞；壓力低；油量不足；泵內有異物；潤滑不良；密封圈損壞或嚴重漏油；泵殼、齒輪磨損嚴重。
停機時將泵放入油箱內；待壓力升高后開始泵工作；此時壓力降增大；泵內壓力保持不變，當壓力降到一定程度時真空泵突然啟動泵內壓力突然升高或下降；發動機停機時排出柱塞泵內壓力持續下降直到不能繼續下降；柱塞突然停止動作甚至無法動作；無法繼續泵注；突然停機；壓力升至正常值；壓力恢復正常后；發動機起動困難或突然停止泵時；由于泵腔內充滿氣體或油液，而不能排出時（此時發動機空載運轉）可能造成軸承嚴重損壞以及機械零部件損壞。
在工作過程中，當油缸間隙過大時容易造成液壓缸回路堵塞，液壓缸阻力增大，液壓缸行程變短，液壓系統工作壓力降低液壓缸間隙過大時，造成液壓缸活塞桿彎曲、磨損、軸向竄動和油路漏油，使液壓缸受到污染而產生泄漏，導致缸間隙過大或超過要求密封間隙。
若液壓缸間隙過大，不能達到規定的密封要求時，應拆下密封墊片更換；若液壓缸間隙過大，缸內壓降增大，使缸體受力變大，引起活塞桿彎曲、軸向竄動和油路漏油，使液壓缸受到污染并產生泄漏，導致液壓系統發生泄漏；若液壓缸間隙過大，但活塞桿仍能保持在規定位置上或不會向外竄動，則說明有缸孔堵塞或彈簧折斷；若壓力不足時，在工作過程中可突然切斷動力而使其停止工作；若高壓液壓缸間隙過大，不引起油壓下降和壓力升高而造成油缸壓傷或拉傷；若壓力下降幅度大且穩定不變時，可說明高壓缸嚴重損壞。
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