Hydraulic Linear Actuators

Hydraulic linear actuators use a cylinder and hydraulic fluid for motive force. Like other hydraulic systems, the force applied at one point is transmitted to another point using an incompressible fluid. A hydraulic linear actuator requires relatively little maintenance and can operate for prolonged periods of time under adverse environmental conditions. Consequently, hydraulic linear actuators are often used in hydraulic table lifts and hydraulic cab lifts. A hydraulic table lift is designed to raise and position heavy workpieces for material handling and loading applications. A hydraulic cab lift is used in fire engines, tow trucks, and industrial equipment to raise or lower cabs or beds. Hydraulic linear actuators are an integral part of both hydraulic systems.

Hydraulic cab lifts and hydraulic table lifts consist of an electric hydraulic pump, dual lift cylinders, and a series of hoses and valves. Hydraulic cab lift cylinders are equipped with a velocity fuse that prevents the cab from accidentally descending when the control is moved to the tilt position. Hydraulic table lifts are fitted with similar safety mechanisms. Hydraulic linear actuators use motor control and hydraulic valves to provide variable acceleration and deceleration, as well as smooth load-raising and load-lowering characteristics. The force capability of some hydraulic linear actuators reaches 7,800 pounds of force. This amount exceeds the capabilities of similarly-sized screw actuators and electro-mechanical actuators.

Hydraulic linear actuators are used in applications and industries where high force-density, precision control, and long operating life are required. Some hydraulic linear actuators are used in steam turbines or process control valves. Others are used with dampers and motion control systems. Products with certifications and approvals are commonly available. The Hydraulic Institute (HI) is a non-profit industry association dedicated to excellence in the engineering, manufacture, and application of hydraulic equipment. HI uses methodology from the American National Standards Institute (ANSI) before issuing standards for hydraulic systems.

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