At the same time, diaphragm B compresses the volume in its chamber, which closes valve 3 and forces fluid past valve 4 and out through the outlet port (‘O’). When the air valve reverses the movement of the diaphragms, fluid is pumped via the left hand side of the pump. The diaphragms are clamped to the walls of the pumping chamber so there are no sliding seals in the pump. The diagram shows the flow of liquid from the bottom to the top, however alternative designs allow liquid to flow from the top to the bottom of the pump or even through the centre of the pump, which can lead to smoother flows.

The installed high-speed centrifugal pump produced vacuum gas oil and proved fairly susceptible to faults, but this task is now being fulfilled by a diaphragm piston pump. It performs the process with significantly higher energy efficiency and has been working without faults for more than 700 days.

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As a result this can cause significant restoration costs and in many cases suspend productivity. Due to the size and make-up of AODD pumps, these issues rarely occur.

Julien Bassett is the global product manager for diaphragm pumps at ARO with more than 15 years of experience in engineering and product development. Bassett leads the development of technical fluid management products designed for performance and serviceability. For more information, visit www.arozone.com or call 1-800-495-0276.

However, high set-up cost and complex operability of latest liquid handling systems may restrain its market. Also, lack of reliability is key factor affecting its growth in case of crucial microbial or forensic studies.  Development of liquid handling technologies which can suitably provide features such as more walk-away time, higher throughput, more flexibility, improved software and greater accuracy can be foreseen as a market opportunity in the near term. Further, enhancement of liquid handling technologies which are capable of handling smaller volumes of liquid can be highly suitable for microfluidic studies and single cell analysis in the future years.

The sections that follow consist of the global AODD Pumps market analysis by material of construction, flow rate, fluid inlet & outlet size, application, end use industry and region/country. The overall analysis of the AODD Pumps market begins with overall global market assessment followed by analysis for numerous regions citing the macroeconomic environment of the particular regions. Each regional section of the report discusses qualitative data and quantitative aspects of the global AODD Pumps market.

The pumping of waste fluids is an important requirement in a host of different industries and liquid waste can frequently contain varying amounts of solids, from sludge, slurries and solids in municipal and industrial waste applications, to slurries laden with rocks, pebbles and other particulates in the mining industry.

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Because it is one of the most chemically inert compounds available, PTFE can be used with an extremely wide range of fluids. Also known as Teflon, PTFE is used with highly aggressive fluids such as aromatic or chlorinated hydrocarbons, acids, caustics, ketones and acetates. Its properties provide excellent flex life and moderate abrasion resistance. In addition, PTFE complies with FDA 21 CFR 177 and USP Class VI standards for food, beverage and pharmaceutical applications. Because PTFE is non-elastic, a backup diaphragm of a different material must be used to provide flexibility and memory. Material options for backup diaphragms are Neoprene, Saniflex and high temperature Buna-N.

Peristaltic pumps are also especially effective at pumping fluids that contain trapped gases. Fluids such as chlorine and hydrogen peroxide tend to release absorbed or occluded gases when subjected to a vacuum or to changes in temperatures. While diaphragm pumps can lose their prime and fail when gasses build up in the pump head, peristaltic pumps can pump both fluid and gas and pump without losing prime.

Rotating assembly: The rotating assembly of the flexible-liner pump consists of an eccentric rotor that is mounted on an overhung, frame-mounted shaft, and is completely isolated from the pumped fluid. The liner acts as a joint gasket between the pump body and cover plate, and between the body and the bearing frame. Since the aggressive fluid does not contact the rotor, the rotor does not require special materials of construction. As the rotor oscillates within the liner, it creates a sealed, rolling contact point between the inside surface of the body block and outer surface of the liner. This imparts a progressive squeegee action on the trapped fluid.