Compressed air diaphragm pump
Compressed air diaphragm pumps are used wherever products have to be pumped simply and gently. The mode of operation of the pump enables low-shear pumping of thin to highly viscous media. The design with ball valves prevents backflow of the product. The low shear to an optimum degree protects the mass and the solids in suspensions.
The design is very reliable, easy to operate or control and can even be used in the ATEX version without any process-technical requirements. The resulting processes are the emptying of containers even without monitoring, the filling of templates, simple transfers up to dosing tasks.
The advantage of having no dynamic seals to the atmosphere is particularly evident in the case of media that are difficult to seal. The ball valves used guarantee the high inherent tightness.
The great advantage of the pumps is their ability to suck dry up to a height of 7.6 mWS and their unlimited dryrunning capability. Additionally, a high chemical resistance of up to PTFE/AISI is given. All these advantages create the basis for successful delivery even in difficult applications.
Easy and effective cleaning is possible thanks to the use of membranes with smooth surfaces inside the pump, without screws and washers. Due to the possibility of a complete visual inspection of the wetted parts, there are no hidden areas where bacteria can grow. As a standard, compressed air diaphragm pumps can be cleaned and disinfected without disassembly to eliminate any microorganisms present. This makes them suitable for both CIP (Cleaning in Place) and SIP (Sterilisation in Place) .
Compressed air diaphragm pumps in plastic PE & PTFE variants have outstanding chemical resistance to chemically aggressive liquids or highly aggressive acids.
The reliable compressed air diaphragm pump is typically used in the following areas:
- Chemicals
- Food and beverages
- Paper industry
- Surface technology
- Waste water
- Electronics industry
- Printing industry
- Paints and varnishes
As an alternative to the welded-in ball check valves, the market offers robust and easy to clean flap valves. These enable solids to be delivered up to a diameter of 50 mm, in special cases even up to 100 mm. The solids can pass through the pump with practically no damage.
At the heart of any compressed air diaphragm pump is the air control valve. It alternately directs the compressed air into the air chambers behind the diaphragms. Thanks to special sealing systems, many of these valves operate maintenance-free and without additional lubrication. This eliminates the need for constant checking of the oiler and avoids oil mist in the vicinity of the pump.
GeneraL characteristics
- 0 to 54'000 l/h conveying capacity
- Pressures up to 16 bar
- For fluid media
- Suction capacity up to 8 m WS
- Self-priming up to 7.6 m WS
- Temperatures up to 110°C
- Gentle and low-shear
- Dry-running safety
- The conveying quantity can be regulated in proportion to the air conveying quantity
- Simple pumping principle
- No shaft seal
General applications
- Dosing, conveying, emptying and transferring
- Up to abrasive, corrosive, gaseous and particle-laden media
Functional principle
Compressed air diaphragm pumps operate in compressed air mode. Two diaphragms connected to a piston rod are pushed back and forth by alternately filling the air chambers located behind the diaphragms. This creates a negative pressure on one side, which draws the pumped medium into the housing. At the same time, the pressure of the diaphragm on the other side forces the existing medium to the discharge socket. Ball or flap valves ensure that the medium flows through the pump in the correct direction. This process is repeated alternately. Distribution of the compressed air is controlled by an air control valve. This leads the air alternately into one of the two air chambers behind the membranes.
Additional information
- Pump with EHEDG and/or ATEX certificate
- Pump with control part in VA or PP
- Pump can be heated/cooled
- Pump can be installed in any position
- Pump with stroke counter
Further information and advice
We will be happy to support you using our expert knowledge and our experience to choose the right compressed air diaphragm pump. Please contact us for further information or detailed advice.