PRODUCTION • PROCESSING • HANDLING
NEW screw pumps launched A
n application in media delivery can often be handled by using different pump types.
However, optimum results and material-preserving transport require rather exact matching of the pump to the different parameters such as viscosity, temperature, NPSH value or shear sensitivity. Netzsch therefore supplements its portfolio of progressing cavity pumps and rotary lobe pumps by three model series of compact screw pumps: the Notos two, three and four- spindle pumps. Depending on the type, they are suitable for non-lubricating substances at high pressures up to 80 bar and temperatures up to 300°C. Thanks to special materials, hydraulic compensation and geometry – optimised through FEM (Finite Element Method) simulations – all Notos pumps are designed for top efficiency and operating life. The core feature of the screw pumps is their concept following the high efficiency unique design (HEUD) and producing a proven improved force-
performance ratio. This is due to the very hard materials used – ranging from grey cast iron to chrome-nickel steel and duplex or Hastelloy alloys. The stability of the materials ensures very minor sagging of the spindles, even under high loads; this allows working with very narrow tolerances between dynamic and static parts. Possible back- flow from the higher pressure to the lower pressure side is reduced and the delivery efficiency increased. The shape of the spindles has also been adapted to minimise interferences and resistances in the material flow. Netzsch advanced calculation methods in this process, e.g. FEM, permit a realistic simulation of the pump and the pumping process with freely configurable parameters. Beyond this, the choice of materials and the design ensure high robustness and service life of the pumps. Each pump is designed specifically for its application area, especially in terms of size, which concerns rotational speed and the sliding velocity of the parts
moving in synch. This exact matching of technology and equipment to the application allows adapting to the specific properties of the medium and also the loads – due to the type of deployment – early on and to largely compensate for influencing factors that could lead to increased wear or damage. l
For more information ✔ at
www.engineerlive.com/iog
For more information visit
www.netzsch.com
Magnetic switch series introduced E
ach type of industry has its own particular features and specifications. This
is certainly true in liquid level measurement. In this case, the magnetic level indication – visual level indicator (VLI) – demands have to be met. By adding electrical accessories such as magnetic switches or/and level transmitters, a VLI can be upgraded to become a reliable system. These can be used as actuators for pump and valve actions as well as analysing points within an SPS or computer system. Apart from the choice of materials and adherence to standards, the electrical connection
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is also an important factor. Integrated cables of 3m, 5m, 10m and 20m length are usually long enough to connect easily to a junction box or a circuit branch. However it is difficult to find a cable suitable for all requested requirements. Halogen-free or chemical resistance are just a few of the demands. Also important are the temperature range and type of shielding. To create a universal interface allowing the customer to use their own cables, Weka has launched a new magnetic switch series using M12 plug- connectors. The M12 thread is in accordance with the IEC 61076- 2-101 standard.
The main advantage is that a mating
plug (either straight or angled) can be purchased as well and mounted on to the customer’s cable; or else a cable with already injection-moulded mating plugs can be used. The switches are easy to install and can also easily be swapped in case of replacement. They also offer all the well-known advantages, such as change-over technology, high loading capacity and a robust casing. Each VLI can be upgraded with any kind of magnetic switch even if the VLI has been in use for decades. l
For more information ✔ at
www.engineerlive.com/iog
For more information visit
www.weka-ag.ch
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