What Is a Hydraulic Cylinder? A Simple Guide to Its Working Principle and Common Uses A hydraulic cylinder is a mechanical actuator that is used to provide a unidirectional force through a unidirectional stroke. It has many applications, especially in engineering vehicles. The working principle of a hydraulic cylinder is based on Pascal's Law. When pressure is applied to the hydraulic fluid in a confined space, the force is transmitted equally in all directions. In a hydraulic cylinder, the piston divides the cylinder into two chambers. When hydraulic fluid is pumped into one chamber, it creates pressure, causing the piston to move and generating linear motion. Hydraulic cylinders are widely used in various industries. For example, in oil & gas exploitation and petrochemical processing, they are used to control valves and move heavy equipment. In shipbuilding, they help with tasks like lifting and positioning large components. In wind farm construction, highway & cross - sea bridge projects, and heavy - duty engineering works, hydraulic cylinders play a crucial role in providing the necessary force for construction machinery. WREN, established in 1992, is a professional manufacturer of a complete range of hydraulic equipment from 70Mpa to 300Mpa operating pressures. With years of mature manufacturing know - how, WREN not only offers self - branded products but also provides reliable OEM and ODM customization solutions to clients worldwide. Our hydraulic torque wrenches, an important part of hydraulic equipment, have been widely adopted in the above - mentioned core industrial fields, bringing the latest innovations and technology to the global hydraulic equipment market.