What a hydraulic jack works? Large cylinder and piston composed of large hydraulic lifting cylinder, lever handle, small tanks, small piston, single composition manual hydraulic pump. As lift the handle of the small piston moves upward, the lower end of the small piston oil chamber volume increases 320 jack, a partial vacuum, then the one-way valve opens, the suction through the suction pipe from the tank; firmly pressing down on the handle, the small piston down, small lower chamber pressure piston rises, the check valve is closed, the check valve is opened, the oil through the pipeline input cavity under the lift cylinder, forcing large living upward movement dragged four jacks, top lifting objects. Lifting the handle once again sucking electric hydraulic jacks, one-way valve closes automatically so that the oil can not turn the clock back jacks, thus ensuring the weight will not fall on their own. Constantly reciprocating lever handle, we can continue to put oil into the hydraulic lifting cylinder lower chamber, so that the weight is gradually rising. If you open the valve, the lower chamber of the lifting cylinder oil by pipeline, shut-off valve back into the tank, the weight to move down, which is the working principle of hydraulic jacks. QF type separator double-acting hydraulic jack, hydraulic return, the use of advanced manufacturing technology, high-strength thick cylinder, with high safety factor, long life and other characteristics, is the product of years of experience I plant developed mature quality products, extensive used in highways, railways, bridges, subways, construction, shipbuilding, mining machinery, foundation settling tests, static piling, pile testing and other industries. QF type separate hydraulic jacks can be equipped with hydraulic lock (optional), as required in the model plus -S jack | hollow jack | Lu Hydraulic (certified merchants) are provided by the Texas Lu of the hydraulic machinery plant. Texas Lu force hydraulic machinery plant (www.luliyeya.com) strong, credible, in Dezhou hydraulic machinery and components industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Lu Hydraulic and you hand into the brilliant, for a better future!