VERDERAIR PURE — Chemical-resistant AODD pump
Verderair PURE is an air-operated double diaphragm pump made of plastic, specially designed for pumping aggressive and chemically demanding liquids. The pump has a leak-free, sealless design and is available in several material grades that cover a wide range of chemical compatibility.
Typical applications / cases
- Perfume production: Dosing alcohol, acetone and ethanol into a line at 5 bar in an EX zone. Solution: VA-P in PTFE with dampers and stroke sensors in conductive material (7 bar air supply). Benefits: chemically inert, easy installation, low pulsation, ATEX approved.
- Foundry – degreasing of moulds: Standard AODD pumps had an MTBF of only 6 weeks when pumping an abrasive degreasing agent. Solution: VA-P25 in PE with EPDM elastomers. Result: 70% increase in MTBF, better wear resistance, less downtime and maintenance.
- Paint industry – dosing with sulphuric acid: Highly corrosive additives caused leaks in the existing pumps. Solution: VA-P15 in PTFE. Result: less wear, less maintenance, and safe, leak-free operation.
- CIP dosing (caustic and acid): Chemically aggressive cleaning liquids require chemically inert materials. Solution: VA-P in PTFE. Benefits: long service life, safe for the environment and staff, low TCO, and leak detection is possible.
Materials
| Material | Properties |
|---|---|
| Teflon (PTFE) | Widest chemical compatibility, extreme corrosion resistance, very low friction, non-stick, high heat resistance |
| Conductive PTFE | Like PTFE, but conductive – for ATEX applications |
| Polyethylene (PE) | Very wear-resistant (up to 7x better than PP), chemical resistance similar to PP |
| Conductive PE | Like PE, but conductive – for ATEX applications |
Valve balls are available in SS 316 (on the P8/P10 models). Diaphragms are available in EPDM and overmoulded PTFE, which last up to 5 times longer than standard diaphragms (no extra backing plate needed for fitting).
Pump design
The suction and discharge manifolds are integrated in the centre block together with the air valve. Pump chambers with ball or cylinder valves and valve seats on each side.
Connection options
Three suction/discharge configurations (bottom left suction / top right discharge, and so on), and the centre block can be rotated 180° to move the outlet to the top. Flanged connections can be fitted on all models except P08 and P10 (not enough room for the internal metal inserts).
Certifications
EC 1935/2004*, FDA*, CE, ATEX, EN 2.1, EN 3.1, UKCA, ADI-free (no animal-derived ingredients in the elastomers), silicone-free. (*wetted parts only)
Accessories and options
| Code | Function |
|---|---|
| LS – Leak detection | A capacitive sensor in the silencer detects liquid if a diaphragm breaks and sends a signal |
| BS – Barrier system | Double liquid chambers and double diaphragms on each side, with a neutral liquid monitored by conductive and capacitive sensors |
| DM – Manual drain | Bypass system with a manually operated valve to empty remaining liquid |
| DP – Pneumatic drain | Like DM, but activated electrically via a 4/2 valve |
| RE – Remote-controlled pump | The stroke rate is controlled directly by a solenoid valve; the pump has no air valve or silencer |
| SS – Stroke sensor | An inductive switch in the centre block counts strokes and stops the pump after a preset number (ATEX Ex II 2G EEx ia IICT6) |
| PD – Prepared for pulsation damper | Centre block rotated 180° to take a Verderair Pure damper |
How does it work?
An AODD pump has two diaphragms connected by a shaft in the centre section. The diaphragms separate the air from the liquid. The air valve in the centre section directs compressed air to one diaphragm, which makes a discharge stroke and pushes liquid out of the pump, while the other diaphragm makes a suction stroke. Balls or cylinder valves control the flow of liquid into and out of the pump chambers.
Contact us
Tell us what you need to pump, and we will find the right solution.
Request a quote →- Company
- Turoteknikk Drift AS
- Address
- Hildertunet 2, 1341 Slependen
- Phone
- 67 80 63 00
- mail@turoteknikk.no
