• Guardian Rupture Protection System
  • Exploded View
  • 500 Series Plastic Pump

  • Guardian Rupture Protection System

  • Exploded View

  • 500 Series Plastic Pump

One-Nut Double Diaphragm Industrial Pumps

Flotronic® 500 Series Plastic Pump

Unique Polypropylene / PVC plastic Double Diaphragm Pump design normally used for pumping / transferring solvents, acid or chemicals, often as a low cost option to stainless steel.

To Get Your Solution Started:
Request A Quote or Call +1‑770‑218‑8900

Key Features
  • Self-priming, suction lift (3.6m/12ft dry and 8m/26ft wet)
  • Temperature range up to 80ºC (176ºF)
  • Flow rates up to 908 ltr/min
  • Screwed or flanged connections are available as standard including BSPT/BSPP/NPT/RJT/IDF/ISS/DIN/ANSI/BS
  • A range of ½” to 3” connections
  • Can run dry
  • Can stop/restart against closed/open valve without pressure relief or damage
  • ATEX Directive compliant
  • Only one nut to access diaphragms with pump ‘in-line’
  • Easy maintenance access to balls and seats
  • Bolt on external air valve allowing ease of maintenance with pump in-line
  • No lubrication required
  • With environmental protection in mind, Diaphragm Rupture Protection and fully pneumatic Alarm Systems are available
  • Latest designs eliminate the costly internal air mechanisms normally associated with Double Diaphragm pumps
  • Two or four wheel trolleys are available for easy pump transportation.


  • transfer an extensive variety of materials efficiently across a range of industries
  • reduce down time maintenance and production costs
  • benefit from a versatile and cost effective pumping solution Applications:
  • transfer bulk chemical
  • supply CIP chemical systems
  • cover bund wall applications
  • pump coatings, paints, adhesives


Looking to quickly compare the features and benefits of different pump styles, to find the right one for your application? The Unibloc comparison chart is a great place to start.
Hygienic Pump Comparison Chart


Flotronic® Pumps Ltd have long realised that metal pumps aren’t always the right choice. That’s why we developed the ‘500 Style’ Air-Operated Double-Diaphragm pump. Engineered from a choice of plastics, the ‘500 Style’ is a cost-effective means of meeting the challenges presented by pump applications that demand a product-compatible pump. Pumping solvents, dyes and other specialist chemicals present no problems with the ‘500 Style’.

Also ideal to pump various acids and other chemicals where plastics offer maximum product compatibility.

The ‘500 Style’ double diaphragm pump design comprises a solid plastic body and manifolds. These are supported by metal air domes, top and bottom plates and through studs, offering safety without compromising fast maintenance. In common with other Flotronic pumps, the ‘500 Style’ double diaphragm pump can be modified for ATEX compliance.

The ‘500 Style’ also utilises Flotronic’s innovative, easy ‘One Nut’ design

Case Studies

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Critical CIP Chemical Pump on COVID 19 Vaccine

A Skid manufacturer based in the USA, working on behalf of a major Pharmaceutical Manufacturor of a COVID-19 Vaccine, required very reliable pumps on an application pumping CIP chemicals

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Pump Sulphuric Acid With An AODD Pump

An International Car Manufacturer needed to Pump Sulphuric Acid at one of their plants in the UK. Obviously this material needed to transferred safely; with pump longevity and the time between

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Pump Corrosive Chemicals

UK based manufacturers of industrial cleaning and maintenance chemicals have been using the Flotronic 'One Nut' Air-Operated Double-Diaphragm Pump for nearly twelve years at the heart of their process. Three

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How To Pump Spirits In The Distillery

It is well known that Air-Operated Double-Diaphragm pumps are often specified in the chemical industry where explosive/flammable environments exist, but less commonly known in alcoholic drinks production. But not

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Pump Chemicals Safely With an AODP

UK based manufacturer of speciality chemicals has reduced its pump maintenance time from half a day to less than half an hour, using a 'one nut', polypropylene Air Operated Double

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Pump Specialist Coatings With The Flotronic Diaphragm Pump

Four years and no maintenance required. Yes that’s what one specialist coatings manufacturer has found since installing the Flotronic 500 Series ‘One Nut’ Double Diaphragm Pump. A specialist manufacturer of coatings to the

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Pump Speciality Chemicals Sealants and Adhesives Chemicals Sealants and Adhesives

The customer, a specialty chemical manufacturer in the Midlands, produce a range of specialty products destined for a variety of applications including: surface finishing processes for the automotive, aerospace, telecommunications,

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A wide range of additional accessories and customization options to ensure your Flotronic® One-Nut pump meets your application requirements.

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Pressure Relief Valves

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Check Valves

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In-Line Sight Glasses

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