Mechanical Jacks are designed to lift and support heavy loads by a ratchet mechanism or screw mechanism with small manual effort. Compared with hydraulic jacks, the all-steel constructed mechanical jacks are more reliable and durable without the worry of oil leaking and pump failure.
There are many kinds of lifting jack, and different types of jacks have good performance in their fields. The most common types are hydraulic jacks and mechanical jacks, and the the two different jacks are often compared by end users. Let's take a look at the advantages of hydraulic jacks and mechanical jacks.
Although the two types of jacks are light and small compared with other lifting equipments, their working process are very different, and these differences will enhance its advantages in different purposes.
Hydraulic jacks works principle are according to the pressure applied by the small piston on the closed liquid, which can be transferred from the liquid to the large piston without change in size. Which means it works according to Pascal's law. The advantage of hydraulic jacks is that it is more labor-saving, and it’s unique internal valve switch can make it return quickly.
The working efficiency of the mechanical jack is not high, but it has a stronger load capacity and pressure holding capacity, it can be in a state of high load for a long time with few adverse changes in the interior, so the mechanical jack is often used in bridge maintenance and construction. It's the return stroke is relatively slow.
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