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An expanding collection of useful articles on pump selection
and how diaphragm pumps work


Click on the title for full text

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Feature Book

Read about the fundamental design elements of diaphragm pumps

Mechanically Driven Diaphragm Pumps for Use with Gases

by Erich Becker, Managing Director, KNF Neuberger GmbH, 1966-2000. © 1999, 52pages,  2.6Mb PDF file

Reprinted with permission from the publisher.

Whether in medical technology, environmental protection/analysis, in the laboratory or process engineering, many applications are today unthinkable without the use of mechanically driven diaphragm pumps for gases. Their particular properties such as oil-free, maintenance-free and uncontaminated operation make them suitable for numerous fields of application. Despite their wide distribution, they are treated only marginally, if at all, in the general literature and, up until now, there has been neither a general account nor a comprehensive summary account of these pumps.
The intention of this book is to fill this gap and provide an overview of the diaphragm pumps with mechanical drive. In addition, examples of applications and advice concerning selection of the right pump are included in the subject matter.
This book will serve to inform and stimulate both the engineer constructively working on design plans, and the engineer undergoing training.
Read the Table of Contents HERE.

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Video AC & DC Motors for Pumps and Compressors (Video)

by Eric Wilson, Regional Sales Manager - OEM Products, KNF Neuberger, Inc.
Produced by Lee Teschler, Editor, Machine Design (2009)

KNF pumps are available in a dizzying variety of motor types. In this informative video, shot on location at the KNF booth during the Medical Design & Manufacturing show in NYC, Eric describes each motor type, talks about the advantages and disadvantages of each, and provides insight on the important process of choosing the right motor for your application. The video covers AC, DC, Brushless DC and Ironless-core motor types and their application.

Eric assists his customers with pump selection at KNF in Trenton, NJ, and has been with the company for over 5 years. He holds a BSME from Penn State.

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Getting Pumped Up on Diaphragms by Design (Process Pumps)

by Richard J. Aerts, Process Products Engineer for KNF Neuberger, Inc.

All diaphragm process pumps for use with gases and vapors share certain fundamental characteristics, including relatively simple construction, oil-free operation without maintenance, high gas tightness, and uncontaminated delivery of the gas. Beyond the basics, though, specialized performance can be realized from diaphragm pumps due to their design versatility and application adaptability.
Diaphragm pumps transfer, compress, recirculate, or evacuate gases or vapors in industry and research applications for medical technology, analytical instrumentation, control engineering, chemical and process engineering, or in the laboratory, among others. The proper design and selection of a pump’s diaphragm and how effectively a pump can be customized to handle the demands ultimately will govern success in an application.

Versatile Solutions for Micro-Dispensing

by Dipl.-Ing. Stephan Kaufmann, KNF Flodos, Sursee, Switzerland

Chemical analysis, clinical diagnostics, pharmaceutics, process technology, are just a few examples of the many applications where small quantities of liquids need to be dispensed. Diaphragm pumps are amply qualified for such tasks. Boasting four exceptional pump designs, KNF Flodos has the solutions to cater for virtually every requirement.

Vacuum Pump System with Wireless Remote Control

by Roland Anderson, Laboratory Products Manager, KNF Neuberger, Inc.

KNF Neuberger’s new SC920 vacuum pump system includes a wireless remote control for easy monitoring and control of vacuum system functions, even in a safety vent hood from across the lab.

Whether adjusting the system pressure or opening/closing the coolant valve, researchers can instantly make a change using the touch screen and control knob on the hand-held remote control.

Thanks to this remote control capability, it is no longer necessary for the vacuum system to occupy valuable bench space. Instead, store the SC920 under the lab bench or in a fume hood, yet maintain complete remote control.

The Case for Dedicated Laboratory Vacuum Systems

by Roland Anderson, Laboratory Products Manager, KNF Neuberger, Inc.

The demand for a reliable vacuum source has led to several different vacuum pump solutions. Many large industrial and academic labs traditionally use a centrally located house vacuum system. House vacuums normally consist of a large, powerful vacuum pump designed to distribute vacuum throughout the facility using an installed piping network. Others use water aspirators and oil-sealed vacuum pumps.

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Self-Cleaning Vacum Pumps... A Solution for Applications Producing Condensation

by Erwin Hauser, KNF Neuberger, GmbH.

Where gases with high moisture content must be evacuated during vacuum drying operations, condensate may collect in the vacuum pump head. Consequently, the pump may not perform properly and may take more time to evacuate the designated volume. Read how KNF's new, self-cleaning PowerDry® models clear moisture from the pump head to dramatically increase pump efficiency.

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Transferring and Metering Liquids with High-Speed Diaphragm Pumps

by Erwin Bolt, KNF Flodos AG

Diaphragm pumps can be used for the transfer and dosing of liquids in many different applications. This article concentrates on fast running diaphragm liquid pumps. It describes the operating principle, construction and characteristics of these pumps and shows the technical advantages. Read about the use of such pumps in laboratory equipment.  

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Selecting the Proper Diaphragm Pressure Control Valve

by KNF Flodos R&D Center, Switzerland

The possible uses of the pressure control valve are widely varied and well established. It can be used in two possible ways depending on the application. Maintain constant back pressure for exact flow rates under free flow conditions, with positive pressure on the inlet side or with varying back pressure, or with the operation under vacuum, or serve as a safety device for protection of the pump, motor, pipework, vessels and other accessories. Installed as a bypass valve, it prevents damage from excessive pressure build up in the system caused by dirt, misuse or other problems.

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Guidelines for Selecting Small Pumps

by Eric Pepe, KNF Neuberger, Inc.

A number of technological breakthroughs in fluid-handling pumping systems have occurred over the past ten years, including better materials, advanced controls, and more efficient constructions, giving engineers more design flexibility than ever before. This article gives you a brief introduction to the many design choices now available to you while designing your system.

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Metering Pump Designs

by Eric Pepe and George Halfinger, KNF Neuberger, Inc.

The positive displacement metering pump is generally the first choice for providing precise and repeatable flow in many medical device fluid dispensing applications. Understanding the full range of established and newer metering pump technologies available allows for the selection of the best metering pump to meet your fluid handling needs.

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The Logical Path - The Application of Ceramics to Diaphragm Pumps

by Erwin Hauser, KNF Neuberger GmbH

To achieve the highest possible safety in service, pumps employed in the chemical industry must be gas-tight, chemically resistant and maintenance-free. To avoid unwelcome chemical reactions and to maintain the purity of the gases, contamination by the pumping process must be prevented. Read how KNF overcame the many design challenges presented by using PTFE materials.

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Selecting the Right Pumping System for Your Device

by Eric Pepe, KNF Neuberger, Inc.

It’s the kind of scenario that makes engineers and medical device designers cringe. You’ve finished designing a $50,000 blood analyzer and, with 50 units in the field, you’re already moving on to your next project. Then the news comes in.....
This article shows the importance of the designer communicating with his pump supplier early in the design process.

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Sample Pump is Key to Instrument Reliability

by Eric Pepe, KNF Neuberger, Inc.

While a pump often is the heart of pollution equipment and devices that use pumps, clear guidelines highlighting key criteria for selecting an appropriate pump have been seriously lacking. For pollution equipment designers and manufacturers, this situation can lead to disastrous product failures product failure; for end-users, it can be the difference between purchasing equipment that provides reliable data acquisition and durable performance, equipment that fails short of the mark. Read how a pump should be considered as a sub system, not as a standard commodity.

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Compressors and Vacuum Pumps that Meet Medical Demands

by the staff at KNF Neuberger, Inc.

Compressors and vacuum pumps are the heart of many medical devices, such as diagnostic equipment, oxygen generators, aspirators, and nebulizers. Unlike many other applications, however, the special requirements of medical OEM’s demand more than simply a pump with the correct flow rate and pressure level.

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Selecting the Right Pump for the Job

by Eric Pepe, KNF Neuberger, Inc.

High quality and long life required from medical equipment are pushing advances in compressor and vacuum pump technology. Too often, standard products are purchased too late in the design process to meet the complex, dynamic needs of a system. The author explains how a modified design, that will more closely meet specific system needs, should be investigated.

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It’s the Diaphragm that Does It

by Werner Trares of Freudenberg Spezialdichtungsprodukte KG and Erwin Hauser of KNF Neuberger GmbH

Diaphragm pumps for gas and vapor have had a place in the analysis, medical, and process engineering markets, as well as in the laboratory. They can deliver media uncontaminated, have high gas tightness, and can be designed so that the parts coming in contact with the media are chemically resistant. Depending on the diaphragm type used, the properties and applications of these pumps can vary in considerable detail. This article explains the three basic designs of diaphragm in use today; the flat diaphragm, the molded diaphragm, and the structured diaphragm, and the proper application of each.

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The Structure of a Diaphragm by the staff at KNF Neuberger, Inc.

KNF's  patented structured diaphragm has made it possible to significantly reduce the size for a given performance. Diaphragm pumps for compressing and evaluating gases can be classified by the type of diaphragm they employ. It is the diaphragm that determines the performance of the pump. The story of KNF Neuberger’s development of the patented structured diaphragm can only be described as the application of precision design practices.

 

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