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Chemical-resistant and lubrication-free: igus high-performance polymers for fluid technology

Chemical-resistant and lubrication-free: igus high-performance polymers for fluid technology

The company igus creates solutions to meet the special requirements of fluid technology. The range of applications of iglidur plain bearings, drylin linear guides and lead screws is constantly growing. In moving parts on pumps and drives, plain bearings and linear bearings manage without lubrication.

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, piston rings and dryspin lead screw nuts made of iglidur 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. igus plain bearings are made of high-performance polymers for dynamic applications and are continuously optimised for a wide range of applications. In addition to the universal ‘all-rounders’, special solutions for food contact, very high or low temperatures, high loads and media resistance have been developed.

In order to increase the mechanical load-bearing 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 during installation or during operation.

Various possible uses in pump systems

Whether in the rotor bearings of water pumps or as knife edge rollers in peristaltic pumps - iglidur plain bearings can be used on a large number of moving parts. Conventional solutions made of metal require complicated sealing to prevent the lubricant from seeping into the medium. Failure of this seal results in contamination. The use of iglidur plain bearings eliminates this risk.

Easy 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 piston rings from igus are used to replace elaborately processed PTFE tapes with just one guide ring, which is simply clipped into place. The possibility to eliminate lubricants is an advantage particularly in medical technology and the beverage industry. 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.

iglidur 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 interior pump cavity 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. Normally, plain bearings would not come into contact with the medium in displacement pumps, however 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 in the medium, which lubricates and cools the bearing. By using iglidur products, higher speeds and a longer service life can be achieved.

dryspin 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 a 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. The precise and smooth guidance required in pumps is therefore 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 website, the suitable systems can be configured quickly and easily via the igus configurator for lead screw systems.

A 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. 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 are ideal with their comprehensive resistance to media and chemicals. A variety of tests in the in-house 3,800 square-metre laboratory ensures a quick selection of suitable materials, tailored to the particular application and the environment – iglidur G, iglidur J, or iglidur X 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 evaluating the entire iglidur range for the selection. The result can then 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 application.

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