Telescopic Hydraulic Cylinders
Telescopic Hydraulic Cylinders may also be referred to as
telescoping hydraulic cylinders of multi-stage telescopic hydraulic cylinders.
These cylinders consist of a succession of aluminum or steel tubes
progressively smaller diameters set within one another, which allows for
significant extension. The collapsed length of the cylinder is usually 20% to
40% of the completely extended length. Of course, this depends on how many
stages are included in the design. Though telescopic hydraulic cylinders may be
custom designed for optimum extension and other features, the maximum number of
stages is usually restricted to six. The largest, outermost sleeve is referred
to as the barrel or the main while the inner sleeves are called the stages, and
the smallest is often referred to as the plunger or piston rod
Telescopic Hydraulic Cylinders are used in a variety of
applications, including construction equipment like dump trucks, large capacity
marine cranes, and oil field drilling rigs. In these demanding settings, the
cylinders are usually used to raise and lower pieces of equipment as with the
dumping action of the dump truck or to erect the mast of a mobile drilling rig.
Generally, the cylinders are anchored in machinery by pivot mounts welded to
the body of the barrel as well as the end of the piston rod, and can tolerate
hydraulic pressure at a maximum of 2000-3000 psi. No matter the application, it is very
important that telescopic hydraulic cylinders be used in a way that avoids side
loads from pushing on the actuator as this can cause excessive wear and
sometimes very serious damage. At full extension, they are even more
susceptible to side forces. Telescopic hydraulic cylinders should always be
viewed as force generating devices, never as stabilizing devices.
There are many manufacturers of telescopic hydraulic
cylinders to choose from and many offer custom design options to suit specific
acting cylinders as well as single acting
cylinders are also an option when it comes to these cylinders. Double
acting cylinders are extended and retracted by use hydraulic pressure in both
directions. Some even use a combination of both single and double acting
technology, where the piston is double acting and the rest of the stages are
single acting. Telescopic cylinders are often used in and considered in regards
to heavy machinery, but there are smaller bore designs used in lighter
applications as well. There are a range of specific designs, features, and
capabilities that can be considered and employed when it comes to telescopic
Telescopic Hydraulic Cylinders - Cylinders & Valves, Inc.
Telescopic Hydraulic Cylinders - Southern Hydraulic Cylinder, Inc.