Flotronic: The One-Nut Design for hygienic AODD


UK specialist pump manufacturer Flotronic Pumps Limited was founded by Lew Norris in 1981. The engineering design consultancy ‘Norris Brothers’ had been involved in the design of  specialist pumps since 1952.  Lew Norris’ new company pioneered the air-operated, double-diaphragm ‘One-Nut’ pump. Flotronic’s ‘One-Nut’ design allows quick pump disassembly for inspection, cleaning and maintenance – delivering a massive benefit for pump users in terms of reduced down-time, particularly as the pump can be inspected or maintained in line without disconnection of pipework. Flotronic remains the only British-owned specialist manufacturer of air-operated, double-diaphragm pumps in the UK.

The pump’s One-Nut design has evolved substantially from the original and is integral to an extensive range of models and deployment in a huge variety of critical process applications. These include transferring materials as diverse as adhesives, cosmetics, drinks, dyes, food stuffs, hand cream, mayonnaise, paints, petrochemicals and yoghurt as well as aggressive chemicals such as acids, MEK and Toluene. Flotronic pumps can provide constant liquid feeds and pump thin or viscous liquids.

The air-operated double diaphragm pump has the ability to dry-run, ease in dealing with dead-heading and solids content. The absence of a need for electricity also makes the pumps readily portable and very safe.

Flotronic offers diaphragm reinforcing plates in any of its pumps where required. The reinforcing plates are held in place by the One-Nut and mean the pumps can withstand pressures in the suction line – known as unsupported head – of up to 7 bar with no damage to the diaphragms. Suction pressure challenges resulting from causes as diverse as pressure cleaning, large tanks and bulk containers, pump priming, re-circulation and thermal expansion can all be met by any Flotronic pump with diaphragm reinforcing plates.

Sanitary applications

All pumps in the standard Flotronic Stainless Steel Slimline range are hygienic. There is also a sanitary Stainless Steel range with specialised surface finishes, seals and internal radii. The pumps with PTFE parts meet USP Class VI standards.

The sanitary H and E Style pumps have been through processes which see them enjoy the United States 3-A and European and EHEDG accreditation.

One-Block as well as One-Nut

The Minichem pump is machined from a solid block of FDA approved PTFE, removing the need for separate manifolds. This One-Block approach, incorporating internal ball valves, means there are no manifold seals and therefore no obvious leak paths, making the Minichem safe to operate in hazardous environments and applications.

Flotronic Pumps offer options on most pumps which make them suitable for in-line maintenance in a potentially explosive environment and therefore compliant with the latest European ATEX Directive. Component selection can cover all Gas Groups (IIA, IIB and IIC).

Flotronic Pumps Limited might be firmly based in the UK but the company exports 40 % of total sales in 2016. The company is seeing particularly high overseas growth in pump sales into its target Pharmaceutical, Food & Beverage, Chemical manufacture and Cosmetics markets. The company has invested heavily in establishing and supporting local dealer networks to make their exports drive happen. Flotronic Pumps Ltd is determined to build on its burgeoning international sales success, with exports as percentage of total sales expected to rise to 50% by 2017.



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