Marzocchi馬祖奇齒輪泵*
ALP1-D-2 ALP1-D-3 ALP1-D-4 ALP1-D-5 ALP1-D-6
ALP1-D-7 ALP1-D-9 ALP1-D-11 ALP1-D-13 ALP1-D-16
ALP1-D-20 ALP1A-D-2 ALP1A-D-3 ALP1A-D-4 ALP1A-D-5
ALP1A-D-6 ALP1A-D-7

Marzocchi馬祖奇齒輪泵*

卸荷溢流閥由溢流閥和單向閥組成。當系統壓力達到溢流閥的開啟壓力時，溢流閥開啟，泵卸荷；當系統壓力降至溢流閥的關閉壓力時，溢流閥關閉，泵向系統加載。使泵卸荷時的壓力稱為卸荷壓力，使泵處于加載狀態的壓力稱為加載壓力。它依靠壓縮彈簧把液壓系統中的過剩壓力能轉化為彈簧勢能存儲起來，需要時釋放出去。其結構簡單，成本較低。但是因為彈簧伸縮量有限，而且彈簧的伸縮對壓力變化不敏感，消振功能差，所以只適合小容量、低壓系統（P≦1.0～1.2MPa），或者用作緩沖裝置。

它通過提升加載在密封活塞上的質量塊把液壓系統中的壓力能轉化為重力勢能積蓄起來。其結構簡單、壓力穩定。缺點是安裝局限性大，只能垂直安裝；不易密封；質量塊慣性大，不靈敏。這類蓄能器僅供暫存能量用。

卸荷溢流閥的主要功能是自動控制泵的卸荷或加載。鑒于卸荷溢流閥的功用，要求卸荷壓力與加載壓力之間存在一定差別。差值過小，則泵的卸荷與加載動作過于頻繁；差值過大，則系統壓力變化太大。

Marzocchi馬祖奇齒輪泵*

ALP1-D-2  ALP1-D-3  ALP1-D-4  ALP1-D-5  ALP1-D-6
ALP1-D-7  ALP1-D-9  ALP1-D-11 ALP1-D-13 ALP1-D-16

ALP1-D-20 ALP1A-D-2 ALP1A-D-3 ALP1A-D-4 ALP1A-D-5
ALP1A-D-6 ALP1A-D-7 ALP1A-D-9

ALP1A-D-11 ALP1A-D-13 ALP1A-D-16 ALP1A-D-20 ALP1AQ-D-2
ALP1AQ-D-4 ALP1AQ-D-5 ALP1AQ-D-6 ALP1AQ-D-7 ALP1AQ-D-9

ALP1AQ -D-3 ALP1AQ-D-11 ALP1AQ-D-13 ALP1AQ-D-16
ALP1AQ-D-20 ALP1AQN-D-2 ALP1AQN-D-3 ALP1AQN-D-4

ALP1AQN-D-5  ALP1AQN-D-6  ALP1AQN-D-7  ALP1AQN-D-9
ALP1AQN-D-11 ALP1AQN-D-13 ALP1AQN-D-16 ALP1AQN-D-20

ALP2-D-10 ALP2-D-12 ALP2-D-13  ALP2-D-16  ALP1AF-S-4
ALP2-D-20 ALP2-D-22 ALP2-D-25  ALP2-D-30  ALP1AF-S-5

ALP2-D-34 ALP2-D-37 ALP2-D-40  ALP2-D-50  ALP1AF-S-9
ALP2A-D-6 ALP2A-D-9 ALP1AF-S-7 ALP1AF-S-6 ALP2-D-9

ALP2A-D-10 ALP2A-D-12 ALP2A-D-13 ALP2A-D-16 ALP2-D-6
ALP2A-D-20 ALP2A-D-22 ALP2A-D-25 ALP2A-D-30 ALP2A-D-34