The below pictures are our YDC2500 prestressed hydraulic tension jacks are applied in Mexico. The tonnage is 250 ton, the tensile strength is 2500KN, 200mm stroke. From the pictures we can see. The hydraulic jack is working for hydropower station, and the hydraulic tension jack is stressing prestressed anchor and PC strands. When the prestressed jack is working, it also need to equip with an electric oil pump, somebody would like to call it hydraulic power pack, the last picture is our ZB2x2/50A electric oil pump.