The merits of the cylinder include fast action(faster than the standard cylinder for 50-100%), low-cost of after-sale maintenance and use(the existing hydraulic oil is consumed that do not replenished, but ie automatic supplied by the special supplementary cup). For the shortcomings, the installation and the longitudinal length are difficult to control, so the cylinder is only installed upright(that is, from top to down), the up-side down or casual angle installation are not allowed. And it is little long in the longitudinal length, so it only applies to the work situation without restrictions in longitudinal length. As a result of the above