Details of Hydraulic cylinder Type
Differences in design and manufacturing of hydraulic cylinders depend on primarily what the industry and application is. Each type uses a different methodology on how the end caps are attached to the cylinder barrel as well as internal nuances. Barrel and end cap wall thickness also varies depending on materials used, cylinder construction and operating pressures. The three most popular types of construction are tie-rod, welded rod and telescopic. All these types can be either single or double acting.
A tie-rod hydraulic cylinder uses threaded steel rods to hold two end caps to the ends of the cylinder barrel.
In a welded rod hydraulic cylinder, the barrel is welded directly to the end caps. The head cap can use a variety of retention methods such as threading or bolting.
Telescopic cylinders typically used when a stroke length is required which is considerably longer than the retracted length. They are designed with a series of steel tubes, called stages, each progressively smaller in diameter and nested within each other.

hydraulic cylinders

hydraulic cylinders

Double-acting cylinders use hydraulic or pneumatic pressure to both extend and retract the rod or sleeve. Double acting cylinders are more common than single acting cylinders.
Single-acting cylinders use hydraulic or pneumatic pressure to either extend or retract a single piston rod or sleeve from a cylinder.