The push-in connections are intended for industrial use.



Push In Fittings
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fittings and hose lines
for centralised lubrication systems

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Lubrication systems - PDF catalog

Generally, a specific part of a machine is called a fitting. In the field of fluid technology and central lubrication technology every screw joint is called a fitting. This includes the push-in type socketless fittings, which are discussed in the following text.

Push-in fittings, which for example have been developed, produced, and distributed by the by company Fritsche GmbH for over 20 years now, are in use all over the world as conjunctions for central lubrication systems. A push-in connects a plastic tube or a high pressure hose with the moving parts and bearings of all types of machinery, in order to protect them from friction contact, and thus against wear. The possible applications of a push-in are extremely diverse. So are the different types of push-in connector in agricultural and construction equipment (such as combine harvesters, loaders and excavators), utility vehicles (trucks and dump trucks) and industrial lubrication systems (such as for example wind power stations, water purification plants, generators, and many more). Our push-in fittings are designed in a way that makes it possible to connect them quickly and easily. Still they work reliably under a pressure of up to 80 bar, and they can be dissembled without tools.

Central lubrication technology, for example with push-in, makes it possible to operate machinery efficiently. It makes regular check ups and maintenance much easier, and therefore, machines become substantially more reliable and durable. The lubrication system ensures that the lubricant reaches the bearing and is therefore necessary for the proper lubrication of the machines. If lubrication is not ensured, damages in the tens of millions may ensue.

In addition, a central lubrication system is less harmful to the environment than manual lubrication, since up to 40% of the lubricant can be saved. In the long term, all that makes it possible for an entrepreneur to save time and especially money when it comes to machinery maintenance.

A push-in type socketless fitting can be used for high pressure lubrication systems, for progressive lubrication systems (the so-called grease kits) and also for fluidized grease lubrication systems. The push-in type connector with a push-in type socketless fitting is known for its high resistance to pressure. This is why they are ideal for lubrication from the progressive distributor to the bearing. Whether a disk or block distributor is used is not important.

Push-in type plug socketless bearings are available in several versions, which have been designed for different uses. Besides straight screwed connections, there are angular screwed connections, and connections with movable joints.

Depending on the situation, the different push-in connectors can be mounted with plastic pipes (for Bs PA 6 or PA 12), with steel pipes (with built-in groove) or with high pressure hoses, as well as with threaded sleeves and special pipe sockets, matching the push-in type.

The advantage of a push-in is on the one hand, that it can be easily and quickly assembled, and on the other hand, that one fitting can be used repeatedly, without reducing its quality.

Even with the push-in the plastic tube is mounted with or without a reinforcing socket. This depends on the material of the plastic pipe to be assembled, and on the thickness of its wall.

In this area we recommend our plastic tubes 6x1, 5, and 6x3 with 1.5 mm wall thickness, which are manufactured to the DIN 73378 norm is from the material of PA12 as an HL model with an operating pressure of 89 bar. These plastic pipes are manufactured in accordance with the extremely high standards of the CETOP criteria.

This is extremely important if it comes to the use of push-in fittings because only a high quality push-in and a plastic tube with tight tolerance frame (+ - 0.05 mm) can establish a secure connection.

Our plastic pipe 6x1, 5 can be mounted without a reinforcing socket both with compression fittings as well as with push-in. This makes the whole construction is very reliable, because a forgotten loose reinforcing socket can cause a lot of damage when the machine is brought into service.

Push-in connections have been in used for a long time in compressed air systems and in pneumatics. This technology is now available for other branches of industries as a part of the lubrication technology. Machinery-, car, construction-, agricultural machinery- and wind turbine manufacturers, can fit these push-in connections into their equipment with only little effort. Therefore the tubes must be cut accordingly, while it hast to be made sure that no piece is deformed in the process. Then the tube can be mounted to the push-in. Our plastic tubes are marked so that it is always clear how far the tube should be inserted into the fitting. When properly inserted, the tube or the socket with nut will be locked immediately, thus being fixated in a pressure proof way. The connection to the push-in fitting can later be easily dissembled without the use of tools. All that needs to be done is pressing the release ring while the tube is pulled. Thus, the compound is dissolved easily and quickly and the individual parts can be reused.

The single push-in is made of nickel plated brass. They are suitable for an operating pressure of 80 bar. The push-in type connector can be used at temperatures of -20 ° to + 70 ° Celsius. Push-in fittings are compatible to most products of all well known manufacturers of lubrication systems. Push-in fittings are an efficient alternative to compression fittings, which take much longer to assemble.

The push-in connections of the company Fritsche are intended for industrial use. Furthermore, only professionally trained personnel should assemble push-in fittings. Besides push-in fittings, the assortment of the company also includes further accessory for centralized lubrication systems. All components are manufactured in accordance with the relevant DIN and ISO standards. Our experience in the field of lubrication technology has allowed us to modify some minor details, slightly so that the products meet the specific requirements of central lubrication technology. If required, customized models can be produced in small quantities according to customer’s wishes.

More Information:
Centralised Lubrication Systems