Unsealed - Leakproof
No mechanical seal and no rotating parts in contact with the fluid, eliminating the risk of leakage due to packing.
Sector Application
Chemical Industry
Diaphragm Pump
Sealed, ATEX compliant air diaphragm pump solutions for acids, bases, solvents and corrosive chemicals.
Chemical Industry
Safe Transfer of Hazardous Fluids
In the chemical industry, fluids are often corrosive, toxic or flammable, so even the smallest leak in the pump means safety and environmental risk. Air diaphragm (AODD) pumps stand out in this sector: they are leak-proof as they have no mechanical seals and no rotating parts in contact with the fluid, they do not generate sparks as they are powered by air instead of electricity, and they can be used safely in explosive (ATEX) environments.
The chemical nature, concentration, temperature and viscosity of the fluid determine the body and diaphragm material. PP and PVDF bodies provide high resistance to acids and alkalis, while the PTFE diaphragm offers long life operation for solvents and a wide range of chemicals. The correct material combination should be verified from the chemical compatibility table.
Pumpport meets the transfer, dosing and discharge needs of chemical plants with PP, PVDF and SS316L body options, PTFE/EPDM/Santoprene diaphragm alternatives and ATEX certified models.
- Seal-less design - very low risk of leakage
- Air powered - spark free, ATEX Zone 1 & 2 compliant
- PP, PVDF, SS316L body + PTFE/EPDM/Santoprene diaphragm
- Resistant to dry running and closed valve (deadhead)
- Can work with particulate and viscous chemicals
- Self-priming - suitable for emptying drums and IBCs
Advantages
Highlights for the Chemical Industry
ATEX Safety
Since it works with air, it does not produce sparks; Ex certified for Zone 1 and Zone 2 explosive atmospheres.
Wide Range of Materials
PP, PVDF, SS316L body and PTFE/EPDM/Santoprene diaphragm are selected according to the fluid transported.
Dry Run & Deadhead
It continues to operate without damage when the tank is empty or the outlet valve is closed.
Application Areas
Where is it used in a chemical plant?
Acid & Alkali Transfer
Safe transfer of dilute-concentrated acids and bases with PP/PVDF body.
Solvent Transfer
Sealed, long life operation with PTFE diaphragm in solvents and solvents.
Drum & IBC Unloading
Safe self-priming discharge from drums, IBC and tote tanks.
Filter Press Feeding
Staggered, high-pressure and strict tolerance feed to filter presses.
Batch & Batching
Adjustable flow rate with air pressure for prescription batch and dosing.
Material Selection
According to Fluid Type
Material Guide
| Fluid Type | Recommended Body | Diaphragm |
|---|---|---|
| Dilute to medium acid and base | PP | PTFE / EPDM |
| Strong acid, halogen, oxidizer | PVDF | PTFE |
| Solvents (ketone, aromatic) | PVDF / SS316L | PTFE |
| Corrosive / chemical containing particles | SS316L | Santoprene / PTFE |
Recommended Products
Pumps for Chemical Applications
Frequently Asked Questions
Things to Consider When Choosing a Chemical Pump
-
PP body is sufficient for low and medium concentration sulfuric acid. For high concentration (>70%) PVDF body and PTFE diaphragm should be preferred; material selection should be verified from the chemical compatibility table.
-
Air diaphragm pumps have no mechanical seal and no rotating parts in contact with the fluid; therefore, the risk of leakage and leakage caused by the seal is very low. Since the pump operates with air instead of electricity, it does not produce sparks and can be used safely in explosive (ATEX) environments. When the casing and diaphragm are selected from the right material, it works long-lasting in corrosive fluids.
-
In installations with explosive gas or dust atmospheres (ATEX Zone 0/1/2 and Zone 20/21/22), the ATEX directive requires the use of Ex-certified equipment. Air diaphragm pumps are naturally suited to these environments as they do not require electricity and come Ex-certified with grounding and conductive material requirements.
-
As viscosity increases, pump flow rate decreases. As a general rule, if the viscosity exceeds 500 cP, a higher flow rate class is selected; pressure loss is reduced by keeping the suction line short and wide. Suction height should also be limited at high viscosity.
-
To start with: PP for dilute to medium acids and bases; PVDF for strong acids, halogens and oxidizers; PTFE diaphragm for solvents and a very wide range of chemicals. The exact choice depends on concentration and temperature and each combination should be verified from the chemical compatibility table.
-
In heavy chemical applications, diaphragm and ball valve seals should be checked approximately every 500-1000 operating hours. Dry running and sudden pressure changes shorten diaphragm life; regular inspection prevents unexpected downtime.
Information Center
Related Guides
Plastic Diaphragm Pump
PP or PVDF body, 7 bar, 16–894 lpm. First choice if chemical resistance is a priority.
ReviewMaterial Compatibility Guide
Chemical resistance summary for PP, PVDF, aluminum, SS316L body and PTFE, EPDM, NBR diaphragm.
ReviewATEX Pump Guide
Explosive atmosphere directive, Zone classification and Ex certification requirements.
ReviewChemical Compatibility Chart
Check the chemical resistance of the pump casing and diaphragm material as A/B/C/D from the table.