Double Acting Hydraulic Jack

The so-called single-acting hydraulic jack and double-acting hydraulic jack are actually distinguished by retraction type. Intuitively, single-acting jacks are equipped with one coupler, and double-acting hydraulic jacks are equipped with two couplers. The single-acting hydraulic jack uses gravity to retract, and the double-acting hydraulic jack uses hydraulic force to retract.
Gravity retracts means that after jacking, a continuous load needs to be loaded. Under the tension of the high-strength spring inside the cylinder, the pressure is slowly reduced, and finally, the jack is retracted. This retraction method takes a long time, but because only a high-strength spring is required for traction in the internal structure, , the cost is relatively cheap. The hydraulic retraction method is to use hydraulic energy to suck the ejected piston rod into the cylinder again. Generally speaking, the pressure required when the cylinder is retracted is half of the pressure when it is lifted. This kind of retraction speed is fast, it is the best choice for projects that require a short time to complete the task, however, due to the complex structure, the cost is relatively expensive