Plastic diaphragm pumps for ATEX zones

Plastic diaphragm pumps for ATEX zones

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Tapflo TX diaphragm pumps made of antistatic PE and PTFE are designed for use in potentially explosive atmospheres. They can be used in zone 1 EX in accordance with the ATEX Directive 2014/34/EU while retaining all the advantages of standard Tapflo PE/PTFE diaphragm pumps – they can pump media of different densities, chemical aggressiveness or solids content. They have a simple design, do not require electrical power, guarantee easy maintenance and maximum reduction of service costs.

Thanks to the use of special, antistatic construction materials, no electrostatic charges can accumulate on the pump. Conductive material additives increase the electrical conductivity of the pump surface. An example of the application of Tapflo TX diaphragm pumps can be, for example, the transport of alcohols and solvents.

Tapflo TX diaphragm pumps made of antistatic PE and PTFE are designed for use in potentially explosive atmospheres. They can be used in zone 1 EX in accordance with the ATEX Directive 2014/34/EU while retaining all the advantages of standard Tapflo PE/PTFE diaphragm pumps – they can pump media of different densities, chemical aggressiveness or solids content. They have a simple design, do not require electrical power, guarantee easy maintenance and maximum reduction of service costs.

Thanks to the use of special, antistatic construction materials, no electrostatic charges can accumulate on the pump. Conductive material additives increase the electrical conductivity of the pump surface. An example of the application of Tapflo TX diaphragm pumps can be, for example, the transport of alcohols and solvents.

Technical data
Pump capacity: 49 m3/h (820 l/min)
Max. discharge pressure: 8 bar
Max size of solids: 3-15 mm
Temperature: 100 °C
Housing materials: antistatic PE, antistatic PTFE
Diaphragm materials: PTFE, PTFE 1705B, EPDM, NBR, FKM
Valve ball materials: PTFE, EPDM, NBR, AISI 316L steel, PU, Ceramic, FKM
Air distributor materials: brass, AISI 316L steel or PET
Basic differences in material designs:
PE HD (polyethylene) High abrasion resistance, 6-7 times better than polypropylene (PP) – this allows the use of such pumps for pumping, e.g., slurries with strong abrasive properties. PE is resistant to most aggressive chemicals, such as concentrated acids and alkalis. The maximum operating temperature is 70 °C.
PTFE (pure polytetrafluoroethylene) High chemical resistance – pumps made of this material can handle even the most corrosive substances, e.g., concentrated nitric acid. The maximum operating temperature is 100 °C.
Available sizes:
Model Max. capacity (l/min) BSP threaded connections  


Sizes of Tapflo plastic diaphragm pumps
TXR09 11 1/4″
TXR20 24 3/8″
TX50 60  1/2″
TX100 125 1″
TX200 330 1 1/2″
TX400 570 2″
TX800 820 3″
Typical applications
Industry Application example
Chemical acids, bases, alcohols, solvents, latex, emulsions
Food CIP fluids, spices, pigments
Paper glues, slurries, adhesives, thinners, resin, sodium silicate, titanium oxide
Surface treatment galvanic baths, acids, solvents, anode slimes, lacquers, enamels
Sewage treatment plants sludge, flocculants, application to filter presses, neutralization
Electronic transport of liquids, “ultra” pure media, solutions for electrolytic coatings, mercury, solvents
Printing glues, varnishes, inks, paints, latex, acids, resins, pigments
Key benefits
Advantages of Tapflo plastic diaphragm pumps 1. Installation flexibility
The ports can rotate 180°. Simply rotate the port to adjust its position to the installation. Plastic ports with BSP or NPT internal threads are supplied as standard. Other versions, including stainless steel, are available on request.
2. Massive and durable body
The pump body is machined from a solid block of PE or PTFE. The massive construction protects against mechanical loads as well as aggressive chemicals.
3. Low air consumption
The air supply system has been designed to minimize all air channels. This has eliminated all “dead spaces” and consequently achieved maximum pump efficiency.
4. Design created for chemicals
The multilayer diaphragm has a completely uniform surface (without metal elements) on the medium side. This is an ideal solution for transporting chemicals.
Operation principle
The Tapflo diaphragm pump is powered by compressed air. Two diaphragms work alternately, pushing liquid into the pumping system. Ball valves act as check valves, directing the liquid in the right direction.
During each cycle, the air pressure behind the discharge diaphragm is equal to the liquid lift height on the medium side. This means that Tapflo diaphragm pumps can operate with a closed discharge valve without negatively impacting the diaphragm’s lifespan.SUCTION
The retracting diaphragm creates a vacuum, and thus the phenomenon of medium suction.DISCHARGE
The second diaphragm simultaneously transfers air pressure to the medium in the second diaphragm chamber, pushing it towards the discharge port.
Tapflo Diaphragm Pump Operating Principle
Construction
Antistatic material of the Tapflo TX ATEX diaphragm pump housing Antistatic housing material for ATEX zones

Conductive material ensures electrostatic safety. This means that charges will not accumulate on the pump. The conductive pigment in the material reduces the surface voltage to below 105 W. The pigments make the pump black, but this does not affect properties such as the chemical resistance of thermoplastic materials.

Extended life diaphragms

Tapflo diaphragms are composite constructions, ideal for heavy-duty applications, providing a completely uniform surface in contact with the medium. This avoids leaks through the diaphragm and keeps it clean.

Diaphragms are available in various materials and colors to suit all needs.

Available material versions: EPDM, NBR, FKM, PTFE, PTFE TFM 1705b, white EPDM, PTFE with white EPDM backing, white NBR.

Diaphragms in Tapflo diaphragm pumps
Composite diaphragm construction

The advanced manufacturing, curing, trimming, and finishing process ensures a long service life for the composite diaphragm, which will last for many millions of strokes. The component materials are specially made and adapted to the composite diaphragm technology and the molding process with pressing.
The elements are fitted using chemical agents and adhesives.

Composite diaphragm construction in Tapflo diaphragm pumps

(1) PTFE TFM layer (2) front layer (3) core (metal) (4) fabric (5) back layer

Air distributors in Tapflo diaphragm pumps Economical power supply – air distributors

The air distributor, which redirects compressed air to the chambers behind the diaphragms, is the heart of the pump. The distributor is located in the center of the pump between the diaphragms to minimize the air path and dead spots. This design is the key to reliable and economical operation. Thanks to a special sealing system, the distributor does not require lubrication. This not only saves money but also protects the environment.

Available material versions: brass, PET and AISI 316L stainless steel

Ball check valves

Tapflo pumps are equipped with four check valves to ensure that the liquid is pumped in the right direction.
Ball valves are the simplest and most reliable check valve design. They are characterized by tightness and ease of cleaning and replacement.

Available material versions: EPDM, NBR, PTFE, PTFE TFM 1635, PE1000, FKM, PU, Ceramic, SiC, AISI 316L.

Ball valves in Tapflo diaphragm pumps
  • Technical data

  • Typical applications

  • Key benefits

  • Operation principle

  • Construction

Pump capacity: 49 m3/h (820 l/min)
Max. discharge pressure: 8 bar
Max size of solids: 3-15 mm
Temperature: 100 °C
Housing materials: antistatic PE, antistatic PTFE
Diaphragm materials: PTFE, PTFE 1705B, EPDM, NBR, FKM
Valve ball materials: PTFE, EPDM, NBR, AISI 316L steel, PU, Ceramic, FKM
Air distributor materials: brass, AISI 316L steel or PET
Basic differences in material designs:
PE HD (polyethylene) High abrasion resistance, 6-7 times better than polypropylene (PP) – this allows the use of such pumps for pumping, e.g., slurries with strong abrasive properties. PE is resistant to most aggressive chemicals, such as concentrated acids and alkalis. The maximum operating temperature is 70 °C.
PTFE (pure polytetrafluoroethylene) High chemical resistance – pumps made of this material can handle even the most corrosive substances, e.g., concentrated nitric acid. The maximum operating temperature is 100 °C.
Available sizes:
Model Max. capacity (l/min) BSP threaded connections  


Sizes of Tapflo plastic diaphragm pumps
TXR09 11 1/4″
TXR20 24 3/8″
TX50 60  1/2″
TX100 125 1″
TX200 330 1 1/2″
TX400 570 2″
TX800 820 3″

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