Low Energy Diaphragm Pumps (LEAP)

Air Operated Diaphragm Pumps

Tapflo Air Operated Diaphragm Pumps are some of the most versatile pumps on the market today. They can be used in a variety of installations in numerous applications. Thanks to the simple operating principle, compact and reliable design and wide variety of materials (PE, PTFE, Aluminium, Cast Iron & Stainless Steel AISI 316L), Tapflo Air Operated Diaphragm Pumps meet the demands of heavy industrial, hygienic and pharmaceutical applications. Their innovative design features up to 70% less parts than their competition meaning down time and costs of spares can be kept to a minimum and simple maintenance procedures are guaranteed!

Their modular design also allows them to be modified for a variety of applications whist not having to replace the pump. Simply purchase the required additional spares to upgrade your standard Tapflo Air Operated Diaphragm Pump into a LEAP, TT Twin, TB Barrier or TD Drum Pump today!

When used in conjunction with Tapflo’s patented control and monitoring equipment, preventive and routine maintenance is also easily integrated into any process, whilst also enabling accurate and precise control of the pump’s performance, optimising your system to the best of its ability!

General Benefits to using a Diaphragm Pump

  1. - Run Dry without damage – No need for dry run protection devices

  2. - Infinitely variable flow control – achievable by adjusting the air flow to the pump via a blocking needle valve

  3. - Air Operated – Intrinsically safe and simple to install, no special training required.

  4. - Self-priming up to 9 m, when wetted

  5. - Solids Handling & resistant to abrasion

  6. - Can handle both thin and viscous fluids

  7. - Can operate against a closed valve without damage – the pump will simply stall

  8. - Available in a wide variety of materials to suit almost any fluid

  9. - Sealless – no mechanical seal, which is the weakest point on any type of pump

  10. - Decent volumetric efficiency – enables them to be used in batching and metering applications

  11. - Relatively low initial cost

  12. - Simple maintenance and low cost of ownership

  13. - Wide range of installation possibilities

  14. - Discharge Pressures up to 8 bar as standard, 16 bar when being used with a booster

Operating principlesAir Operated Diaphragm Pumps are mostly made up of 2 Liquid Chambers, 2 Air Chambers and 2 Diaphragms, with a Flexible Diaphragm separating both the Liquid and Air Chambers. Compressed Air is supplied to the air valve which distributes the air from the Centre Block, where 2 ports direct the flow of air to the right and left Air Chambers. The same air pressure from the air supply is directly applied to the back side of one of the Diaphragms, forcing it forward and therefore the medium out of the Fluid Chamber, lifting the Ball Check Valve and out of the Discharge Port (2), with equal pressure to that which is supplied. The Diaphragms are connected by a shaft which is screwed into the centre of each. As one of them is forced forward the other is pulled towards the Centre Block, causing a vacuum effect on the suction side. The medium is subsequently drawn through the Suction Port (1) and into Fluid Chamber.

The Air Valve automatically transfers the air pressure to the opposing side at the end of each stroke, reversing the action. Hence the term 1:1 reciprocating pump. The Ball Check Valves alternately Open & Close in unison with the reciprocating action of the diaphragms. Enabling filling of the Fluid Chambers and preventing back flow through the pump. A variety of Balls can be supplied to provide both chemical resistance and different weights to suit the viscosity of the medium.

Changes in Capacity due to Suction Lift & Viscosity

Air Operated Diaphragm Pumps capacity will vary according to changes in both viscosity and suction lift, below are charts displaying the % drops in flow according to the changes in both. These variations need to be taken into account when selecting a suitable pump.

Key Components & Benefits of a Diaphragm Pump 

There are 3 essential components for the functioning of any diaphragm pump. Tapflo have specifically engineered these to be of the highest quality and reliability.

Long Life Diaphragms

With our extensive experience of diaphragm manufacturing we are able to supply unique, compression moulded, diaphragms of the upmost quality. The benefits of this type of design are superior life for continuous & heavy duty operation and a completely smooth surface in contact with the liquid. This results in no leak through and a diaphragm which is easy to keep clean. The diaphragms are available in various materials and colours to suit any requirements:


  • PTFE TFM, modified for solvents

  • EPDM

  • NBR

  • FK


Energy Saving Drive

The air valve is the heart of any Air Operated Diaphragm Pump. It distributes the compressed air to the air chambers behind the diaphragms. The air valve in a Tapflo Air Operated Diaphragm Pump is placed in the middle of the pump, between the diaphragms, to achieve the shortest air paths possible and a minimum of so-called “dead volumes”. This all together is the key to a reliable and energy-saving drive.

The Tapflo air valve has no deadlock position – the pump will always start automatically when the air is supplied to the pump. The valve body is made from brass or optional PET or stainless steel AISI 316. It is made for maintenance free duty with non-lubricated air, thanks to the ingenious sealing system. It will not only save you money on lubrication, it will also protect the environment from pollution.

Ball Check / Flap Valves

The Tapflo Air Operated Diaphragm Pump pump is fitted with four check valves as standard, making sure that the liquid is transferred in the right direction through the pump and that the pump remains primed. The ball type valve is the most simple and reliable valve design. It has a good sealing capability and is easy to keep clean and to replace if necessary. The ball valve materials are available in EPDM, NBR (nitrile), PTFE, AISI 316, polyurethane and ceramic to suit any kind of liquid.

With the avocation of Tapflo’s ingenious Magnetic Ball Lifters on our Sanitary and Aseptic EHEDG Pumps, users are able to drain the contents of the pump for CIP & SIP procedures without the need for disassembly or rotating the pump in its stand. What could be easier! The Valve Ball is made from either Stainless Steel AISI 420 or PTFE with a Steel Core to ensure that they can be lifted by the Ball Lifters and are suitable with a wide array of fluids.

Flap valves are used on our Sanitary & EHEDG Air Operated Diaphragm Pumps when pumping liquids containing big solids without damage is required. We are able to pump solids up to 50 mm in both the T225 and T425 pump sizes and an impressive 100 mm in the T825 4” pump. When fitted with flap valves, our pumps can reach dry suction lift of 4.5 meters. Tapflo flap valves are durable, have only two spare parts and are hygienic thus easier to clean.


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