(1) Piston hydraulic cylinder is a single acting cylinders, by fluid pressure can only achieve a direction of movement, plunger return depends on other external force or plunger self-respect. (2) The plunger cylinder liner bearing alone and do not contact with the cylinder liner, cylinder liner so extremely easy processing, so it is suitable for do long-stroke hydraulic cylinder. (3) The plunger total pressure at work, so it must have enough stiffness; When piston weight often larger, horizontal easily droop due to gravity, cause the seals and leads to uneven wear, so its vertical use more advantageous.Plunger Hydraulic Cylinder factory website:http://www.wxglit.com/hydraulic-cylinder/plunger-hydraulic-cylinder/