威格士VICKERS柱塞泵 电磁阀2520V21A12-1AA22R 2520V21A12-1BB22R

变量柱塞泵的压力油经泵体、泵壳变量壳体中的通油孔通过单向阀进入变量壳体的下腔，当拉杆向下运动时，推动伺服活塞向下移动，伺服阀的上阀口打开，变量壳体下腔的压力油经变量活塞中的通油孔进入变量壳体上腔，

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