The most distinctive feature of claw jacks, apart from their attachments, is the spring structure on both sides of the body. Many people are not very familiar with the function of these two springs. Why do most hydraulic jacks not have such a design, but instead install two springs on claw jacks?

As is well known, hydraulic jacks usually return by themselves under the pressure of heavy objects. Even if they are not affected by pressure, hydraulic jacks can return by gravity. As long as the oil discharge valve is opened, the hydraulic oil will naturally flow to the storage tank on its own. However, the force situation of claw jacks during use is sometimes special. If a support is used for lifting, the force on the claw jack is not vertically downward as a whole, which will affect the return efficiency to a certain extent. What should be done?

At this point, the functions of the two springs come into play. The springs are constantly stretched during the lifting process of the claw jack, and this process is also a continuous process of accumulating force. When it is necessary to return, we only need to turn the pressure relief valve, and the claw jack will return to its initial state under the strong retraction of the springs, which is much more efficient than its free return. This is the significance of installing double springs on claw jacks.