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23.04.2018 Low-headroom dense phase conveying

Gericke, Regensdorf, Switzerland, has developed a compact conveying pressure vessel, which – with a volume of just 20 litres – requires a headroom of no more than 660mm. 
Pressure vessels need in general a certain installation height, which is not always available. As an alternative, rotary valves can be used, although these can have a negative impact such as air leakage, wear and product attrition. 
Gericke’s smallest sender, the PTA/PHF 20, provides a throughput of 1.5m3/h and a transfer distance up to 50m, depending on the physical properties of the product being conveyed. It is equipped with a level probe and the additional air volume control enhances conveying efficiency. The Gericke STP 61 machine controller ensures trouble-free and fast commissioning. Furthermore, communication with higher-level control systems is possible via interfaces such as Ethernet/IP, Profibus DP, Profinet RT and Modbus/TCP.
Thanks to its very compact design, the PTA/PHF 20 conveyor sender is particularly suitable for installation under sack tipping and bulk bag stations, dust filters or storage containers. The sender requires very low maintenance as it has no rotating parts. Thus, it is also suitable as a replacement for more maintenance-intensive rotary valves, which are used for lean phase conveying systems.
As a continuous double-conveyor system even throughputs of up to 8m3/h are possible. Depending on the requirements, different versions of the conveyor system are available, such as food grade, high-temperature or wear-resistant versions and for explosive products. The PTA/PHF 20 compact conveyor transmitter is suitable from fine powders up to granules of 15mm. Even very light products with bulk densities of 0.1kg/litre up to very heavy steel balls of 5kg/litre have already been conveyed successfully. Examples of conveyed products include sand, milk powder, nuts, salts, metal powders, additives, filter dusts and blasting agents. 
Gericke’s PTA 20 sender and (below) the PTAD 20 sender


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