Separation type double effect of large tonnage hydraulic jack with large output force, light weight, strong bearing capacity, in any position characteristics of remote operation, with the company electric ultra high pressure pump, top, push, pull, squeeze, pressure and other forms of operation, widely used in transportation, railways, bridges, shipbuilding, construction, industrial and mining enterprises such as equipment lifting installation, commissioning and maintenance, underground pipe jacking operation Characteristic Part of the piston piston rod in welding copper, surface hard chromium plating, never cylinder, abrasion resistance The cylinder is worn on the inside of the cylinder, and the piston rod is plated with hard chromium, which prevents the scratch and corrosion.