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Double Acting Hydraulic Cylinders

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Like all hydraulic cylinders, these mechanisms are designed to generate linear force and motion. Read More…

Double Acting Hydraulic Cylinders Double Acting Hydraulic Cylinders

Double acting hydraulic cylinders are bidirectional linear actuation devices that convert the hydraulic energy of pressurized fluids into useful mechanical energy.

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Leading Manufacturers

Strongsville, OH  |  440-238-7343

Our company name is not a misnomer-we have been manufacturing cylinders and valves since 1958. We manufacture air and hydraulic cylinders plus their associated valves and replacement parts.

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Cylinders & Valves, Inc. $$$

Buffalo, NY  |  716-893-6510

For over 60 years, our company has offered hydraulic solutions to complex high pressure problems. We distribute products such as hydraulic cylinders, hydraulic presses, hydraulic pumps, hydraulic valves (both direction and solenoid), control valves, flow valves and more.

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Buffalo Hydraulic $$$

Newark, NJ  |  800-633-8234

We take pride in saying that we are a family owned business. Our company has over 70 years of manufacturing experience. We will provide all of your needs and you can count on us to get the job done correctly.

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Metro Hydraulic Jack Co. $$$

Little Rock, AR  |  501-375-1141

Phelps Industries specializes in hydraulic cylinders, heavy duty hydraulic cylinders, high pressure hydraulic cylinders, telescopic hydraulic cylinders and hydraulic cylinder repair.

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Phelps Industries, Inc. $$$

Athens, TN  |  800-737-8988

Southern Hydraulic Cylinder manufactures custom welded and telescopic hydraulic cylinders. We maintain inventory on 5" bore and smaller single-acting telescopic cylinders and build-to-order all welded hydraulic cylinders with bores up to 10".

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Southern Hydraulic Cylinder, Inc. $$$
placeholder image Cylinders & Valves, Inc. Buffalo Hydraulic Metro Hydraulic Jack Co. Phelps Industries, Inc. Southern Hydraulic Cylinder, Inc.

Double acting hydraulic cylinders work by admitting and removing pressurized oil, ether, mineral or water composites from an enclosed space. The pressure acts upon a piston with an attached rod that extends and retracts according to the amount of fluid in the chamber. Even a small motor with pressurized fluid can create tremendous work force. The popularity of hydraulic cylinders in agricultural, automotive, power generation, oil and gas, construction, demolition, material handling, aerospace and transport industries among others can be attributed to the significant energy gains they allow.

Double acting hydraulic cylinders can lift, turn, tilt, press, steer, pull and push heavy machine components and attached loads along any linear plane making them useful in cranes, lifts and braking mechanisms alike. While the length and plane of these hydraulic cylinders are fixed, double action offers powered motion for both extension and retraction whereas single action cylinders provide motion in only one direction. Although this requires a larger reservoir of compressed fluids, double acting hydraulic cylinders are often preferred over their unidirectional counterparts as they offer greater mechanical versatility, higher speed operation and tighter control.

While specific models may vary, the basic construction and function of double acting hydraulic cylinders remains relatively uniform. The main body of the cylinder is a round or rectangular tube shaped device enclosed at each end with a cap. This chamber houses and connects all other cylinder components. In one or both end caps there is a sealed hole through which the piston rod is extended and retracted as needed. A cold-rolled piece of metal or ceramic, the rod is attached to a piston within the main cylinder.

The hydraulic piston is a disc-like device that fits perpendicular to the cylinder walls, filling the cross-section of the barrel. This divides the cylinder into two separate compartments. Several seals are placed around the piston head and the rod opening to ensure that fluid does not leak in, out or from one side of the chamber to the other causing a loss of pressure and decreased functionality. In either end is an intake and exhaust valve where the fluid is introduced and removed.

When the pressurized fluid is forced into the section of the cylinder below the piston, the rod is extended while the inverse retracts it. The degree of piston rod extension and retraction correlates with the amount of fluid entered into the enclosed cylinder shaft. This length, known as the stroke, is one of the most important considerations when selecting the proper hydraulic cylinder for a given application. Additional concerns include body type and material, operating pressure, maximum working pressure, rod diameter and bore diameter.