A technical trade magazine with a history of 60 years.
Pumps/Vacuum technology
Pumps/Vacuum technology Companies – Innovations – Products New CHEM-LZ series from WITTE customer in certain applications, however, is that they can also run dry and work against a closed valve, so that no dry-run protection or a bypass or pressure relief valve to switch off the pump has to be installed on site. Due to its design, a diaphragm pump has the property of stopping automatically as soon as a shut-off valve on the pressure side is closed. As soon as the valve is opened again, the pump starts up again. In addition to these obvious technical advantages, the following aspects were decisive for the customer’s decision to use eight compressed air-driven diaphragm pumps in addition to the four eccentric screw pumps: The test pumps supplied have proven to be very robust and, in special applications, could also be cleaned more easily and quickly than eccentric screw pumps, which is very important in the food industry. The higher operating costs to be expected due to the high compressed air consumption were not significant for our customer, since the pumps are only used sporadically and not in continuous operation. Also, in view of the significantly lower purchase price of the pumps and the expected repair costs, the energy consumption argument for these customer applications is not important. An aspect of compressed air-driven diaphragm pumps that should not be neglected is the noise caused by the escaping compressed air or by the mechanical movement of the pump (beating of the balls). When large 1.5” to 3” pumps work at a full 7 bar air pressure, it is often difficult to hold a conversation next to them. Despite the numerous advantages of diaphragm pumps, these pumps cannot be regarded as optimal for all applications, since in addition to an above-average level of noise pollution, high air consumption and strong pulsation must be expected. Ultimately, the decision for the “right” pump depends on many factors that often only the customer knows because of their different production processes. A purchase decision for the respective pump principle always depends primarily on the specific application, in addition to the basic advantages and disadvantages of the respective pump type. The new CHEM-LZ series, a drop-in replacement for Hermetic-LZ gear pumps. WITTE PUMPS & TECHNOLOGY GmbH now offers all users and operators of Hermetic-LZ- gear pumps an alternative solution. The LZ series discontinued by Hermetic in 2018 is still in operation in many plants. However, replacement pumps from the original manufacturer are no longer available, nor are spare parts. Repair and spare parts supply for defective pumps or wear parts is no longer guaranteed by Hermetic. WITTE PUMPS & TECHNOLOGY GmbH, with its more than 35 years of expertise in the gear pump business, has now taken on this field of application. WITTE now offers all users and customers an alternative pump. In agreement and cooperation with Hermetic, WITTE PUMPS & TECH- NONOLGY GmbH continues this series and takes over the design and manufacturing of the pumps under its own name CHEM-LZ. The pumps offered under the new name are absolutely identical in terms of dimensions, but are equipped with internal parts from the WITTE modular system. The user can thus easily exchange the pumps as drop-in replacement without having to modify the system and connections. The quality and grade of the pumps and components correspond to the WITTE standard. The pumps have exactly the same connection dimensions and the same technical equipment. The CHEM-LZ is offered with a single and a double mechanical seal, a magnetic coupling and the matching coupling connection. The advantage of this new series is that the internal parts come from the company's own modular system for the established chemical pumps of the CHEM series. Gear shafts and friction bearings are identical to those of the WITTE chemical pumps. This brings another advantage for the customer in terms of spare parts stocking. In the future, spare parts can be used for both pump types, provided the material pairing and size are identical. In the event of a replacement where a CHEM-LZ is no longer to be used, WITTE also offers a modification of its own CHEM series. The company specializes in customer-specific solutions for conveying tasks with gear pumps. Drop-in-replacement chemical pump of the CHEM-LZ series with magnetic coupling. JESSBERGER GmbH Jägerweg 5-7 85521 Ottobrunn, Germany Phone +49 (0)89 6666 33-400 Fax +49 (0)89 6666 33-411 info@jesspumpen.de www.jesspumpen.de WITTE PUMPS & TECHNOLOGY GmbH Lise-Meitner-Allee 20 25436 Tornesch, Germany Phone +49 (0)4120 70659-0 Fax +49 04120 70659-49 info@witte-pumps.de www.witte-pumps.com 58 PROCESS TECHNOLOGY & COMPONENTS 2022
