No, hydraulic cylinders come in many different types and designs.
Some of the major differences include:
1、Single-acting vs double-acting – Single-acting cylinders provide power in one direction (usually extension).Double-acting cylinders provide power in both extension and retraction. Double-acting cylinders are more complex but allow faster actuation.
2、Tie-rod vs welded – Tie-rod cylinders use tie rods to secure the end caps to the barrel. They can be disassembled for servicing. Welded cylinders have the end caps permanently welded to the barrel. They cannot be disassembled but can withstand higher pressures.
3、Telescoping vs non-telescoping – Telescoping cylinders have stages that extend out from each other. They provide a long stroke length relative to their retracted length. Non-telescoping cylinders have a fixed barrel and stroke length.
4、Flange mount vs trunnion mount – Flange mount cylinders attach with bolts through mounting flanges at each end. Trunnion mount cylinders have trunnion pins that attach to mounting brackets. Trunnion mounts allow more flexibility and range of motion.
5、Sensor-ready vs non-sensor-ready – Sensor-ready cylinders have built-in provisions for sensors like linear position sensors. Non-sensor-ready cylinders require separate sensor mounting brackets and installation. Sensor-ready is more convenient but costs more.
6、Specialty vs standard – Specialty cylinders include clamping cylinders, mill cylinders, air cylinders, stainless steel cylinders, etc. for special applications. Standard cylinders are general purpose, more common and lower cost.
7、Bore size and stroke length – Cylinders have different diameters (bore sizes) and stroke lengths depending on force and distance requirements. Bore size determines the force a cylinder can produce. Stroke length determines its range of motion.
8、Cushioned vs non-cushioned – Cushioned cylinders have mechanisms to slow down and soften the end of a stroke. Cushioning reduces shock forces. Non-cushioned cylinders stop abruptly at the end of stroke. So in summary, hydraulic cylinders vary in many construction, mounting, sealing and design details for different applications, forces and operating environments. However, they all work on the same basic principle of multiplying force using incompressible hydraulic fluid.