Gases & Instrumentation - September/October 2011

the FT head is also used for the ceramic head pump. Even in this much larger version it can be made to conform to the head shape. The valve discs and valve bodies are again of PTFE. PTFE has made possible the development of a pump with a high flow-rate and high resistance to chemicals. (See Figure 3)

Figure 3. An example of an all-PTFE two-stage diaphragm pump driven by an explosion-proof Group C&D motor.

NOTE: A resource on the design and application of diaphragm pumps is available from KNF Neuberger’s website library, at www.knf.com/library.htm Mechanically Driven Diaphragm Pumps for Use with Gases. The intention of this 52 page white paper is to fill a gap and provide an overview of the diaphragm pumps with mechanical drives. In addition, examples of applications and advice concerning selection of the right pump are included in the subject matter. This book serves to inform and stimulate both the engineer constructively working on design plans, and the engineer undergoing training. G&I

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