igus high-performance polymers for fluid technology

Treotham is offering igus solutions to meet the
special requirements of fluid technology. The range of applications of iglidur
plain bearings and drylin linear guides or lead screws is constantly growing.
In the moving parts of pumps and drives, plain bearings and linear bearings
manage without a lubricant. The iglidur products have proven particularly
successful in pumps, valves, fittings and lifting systems. The drylin thread
technology is also used in fittings with rotary knobs and vertical pumping
movements. Even aggressive media is no problem for the chemical-resistant
materials. Due to these properties, plain bearings and piston rings made of
iglidur and dryspin lead screw nuts are frequently used in fluid technology.

In fluid technology, drives are moved by the effects
of pressure on liquids or gases. This mechanism is mainly used in pumps where
the flow of fluids serves to propel movements. Plain bearings made of
high-performance polymers for dynamic applications, start precisely at this
point and are continuously optimised for a wide range of applications. In
addition to the universally applicable all-rounders, special solutions for food
contact, very high or low temperatures, high loads and comprehensive media
resistance have been developed. In order to increase the mechanical loadbearing
capacity, fibres and fillers are added to the material. There are also embedded
solid lubricants that are released as soon as the running partner moves along
the sliding surface of the plain bearing. This self-lubricating effect ensures
that iglidur plain bearings do not require maintenance: external lubrication is
not necessary either during installation or during operation.

possible uses in pump systems

Whether in the rotor bearings of wet-running pumps or
as knife edge rollers in peristaltic pumps – iglidur plain bearings can be used
on a large number of moving parts. It is not only the dry-operating
applications that benefit from the classic iglidur advantages such as the
self-lubricating effect, the freedom from maintenance and the high wear
resistance, but also the user who benefits from the properties of the medium.
Conventional solutions made of metal require complicated sealing, so that the
lubricant does not get into the medium to be conveyed. Failure of this seal
results in contamination; however, the use of iglidur plain bearings eliminates
this risk.

replacement with iglidur piston rings in fittings and valves

To move the fluids and gases used in fluid technology,
the flow through the valves is controlled. For this purpose, a closure section
with sealing surface is pressed against an opening in order to close it.
Depending on the type of valve, diaphragms or pistons are used as closure
sections. Among other things, they can be automatically controlled by
actuators. The iglidur clip-on piston rings ensure that the piston moves
linearly without any lubrication. For example, the cost-effective igus piston
rings from Treotham are used to replace elaborately processed PTFE tapes with
just one guide ring, which is simply clipped into place. The possibility to
dispense with lubricants is an advantage particularly in medical technology and
the beverage industry. Because here, only special lubricants that meet the
requirements of the industry can be used, and the regular cleaning cycles
necessitate a regular re-lubrication of conventional solutions. Using the
piston ring product finder, you can select the suitable products online from
more than 40 iglidur materials; for example, food-grade piston rings made of
iglidur A350 or iglidur A181.

in pumps: chemical-resistant and wear-resistant

Depending on the operation of the pumps, it is roughly
subdivided into displacement pumps and flow pumps. In displacement pumps, the
pump cavity, i.e. the cavity in the interior, is reduced by the movement of a
body. The medium is displaced from the diminishing space and thus driven
forward. For example, iglidur is used in piston or rotary pumps where pistons
as well as gears or screws are used for displacement. The iglidur plain
bearings meet the special bearing requirements of these bodies. They enable
very high precision and are also designed for high speeds and loads. In
addition, they are suitable for tumbling loads caused by the pumping motion.

In peristaltic pumps, where the medium is forced
through the housing with rotating rollers, iglidur knife edge rollers are used,
which are maintenance-free and wear-resistant. Whereas the plain bearings
usually do not come into contact with the medium in displacement pumps, they do
so in flow pumps. A flow is generated by a rotating impeller, which drives the
fluid. Depending on the design of the pump, the motor and shaft also run
completely in the medium, which lubricates and cools the bearing. In this way
higher speeds and a longer service life can be achieved. Such wet-running pumps
can be found, for example, in the water cooling of vehicles. Due to their high
resistance to media and chemicals, iglidur plastics are suitable for use
directly in the medium.

technology for vibration-free pumping

Vertical pumping movements must be performed as
precisely and reliably as possible. Lead screws and matching lead screw nuts
enable smooth running of vertical pumping motions. In addition to the
conventional drylin lead screws, the dryspin technology developed by igus is
also used. The flank angle of the dryspin lead screws is flatter than that of
standard high helix lead screws. As a result, the introduced force is converted
more efficiently into a translational movement. The results are a comparatively
high degree of efficiency and a longer service life. In addition, due to the
radius tooth design, the contact surface between the lead screw nut and the
lead screw is reduced. This is why dryspin lead screw nuts are vibration-free
and virtually silent. The precise and smooth guidance required in pumps can
thus be guaranteed. The drylin thread technology not only stands out for its
efficient and long-lasting high helix threads but also for its corrosion-free
and dirt-resistant properties. On the igus homepage the suitable systems can be
put together quickly and easily via the igus configurator for lead screw units
and the thread product finder.

wide selection of materials for every application

Special requirements for the material arise from the
pressure loads in the pumping system and the properties of the used fluids.
Frequently, the required emergency running properties result in additional
demands, such as extreme pv values, which occur when the pump operates without
the medium to be pumped. In individual applications, additional influences such
as high temperatures or cleaning agents must also be taken into account.
Mineral oils are usually used to generate flow energy for hydraulics
application. Here, iglidur materials convince with their comprehensive
resistance to media and chemicals.

A variety of tests in the in-house 2,750-square-metre
laboratory ensures a quick selection of suitable material, tailored to the
particular application and the used medium – the all-rounder iglidur G, the
endurance runner iglidur J, or iglidur X as a specialist for high temperatures
and chemicals can be selected as standard. The iglidur H1 and iglidur H370, for
example, are excellent for high media resistance, while iglidur A181 and iglidur
A500 are usually used in the food industry. The materials mentioned are
intended for optimum use in fluid technology, but it is worth taking a look at
the entire iglidur range for the selection. The result can thus be optimised
depending on the application; for example iglidur UW for high-speed rotation
under water. The required iglidur materials can be selected online quickly and
easily using the igus product finder and configured to suit the respective

For more information, please visit the Treotham
Automation website www.treotham.com.au
or call 1300 65 75 64.

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