This pneumatic double diaphragm pump utilizes alternating compressed air pressure across dual diaphragms to transfer fluids efficiently. The center section houses a non-stalling, low-lube air distribution valve engineered to eliminate dead-center shifting failures.
Working Principle: Compressed air enters the air valve, alternately pressurizing the back of diaphragm A and B. This forces fluid out of one chamber while suction draws fluid into the opposite chamber, regulated by four gravity-seated check balls.
Core Advantages: Sealless design prevents shaft seal leaks; self-priming up to 20 feet dry; runs dry continuously without internal component damage; handles high-viscosity fluids and suspended solids up to 1/4 inch without mechanical shear.
Typical Media: Concentrated acids, caustic soda, industrial solvents, latex, paints, pharmaceutical slurries, and food-grade syrups.
Typical Industries: Chemical processing, wastewater treatment, surface finishing, pulp and paper, and food/beverage manufacturing.
Product Selection Guide
Selecting the correct stainless steel air operated diaphragm pump requires matching fluid characteristics against hydraulic performance curves.
|
Pump Size (Port) |
Max Flow Rate |
Max Operating Pressure |
Solids Passage |
Typical Application |
|
1/2 Inch |
15 GPM (57 LPM) |
100 PSI (7.0 Bar) |
1/16 in (1.6 mm) |
Chemical dosing, lab sampling |
|
1 Inch |
50 GPM (189 LPM) |
120 PSI (8.3 Bar) |
1/8 in (3.2 mm) |
Solvent transfer, ink circulation |
|
2 Inch |
160 GPM (606 LPM) |
120 PSI (8.3 Bar) |
1/4 in (6.4 mm) |
Bulk chemical unloading, waste pits |
Selection Checklist for Engineers:
• Wetted Material: Specify 316L stainless steel for high chloride or aggressive acid resistance; 304 stainless steel is sufficient for general water and mild alkaline solutions.
• Elastomer Compatibility:
PTFE: Universal chemical resistance; ideal for aggressive solvents and strong acids.
Buna-N / Neoprene: Cost-effective for petroleum oils and non-aggressive fluids.
Viton: High temperature resistance up to 175°C and resistance to aromatic hydrocarbons.
• Air Supply Requirement: Ensure plant air supply delivers at least 15% higher pressure than the required fluid discharge head.
Application & Industry Judgment
Groundable stainless steel construction safely dissipates static electricity, eliminating spark risks when pumping flammable solvents (e.g., toluene, acetone).
Low internal velocities prevent degradation of shear-sensitive polymers and high-viscosity coatings (up to 10,000 cPs).
The pump automatically stalls against a closed discharge valve without pressure spikes or motor burnout, resuming operation instantly when the valve opens.
Supplier Evaluation & Manufacturing Integrity
Material Traceability:
All wetted castings are supplied with EN 10204 3.1 Material Test Reports (MTRs) verifying the precise chemical composition of 316L stainless steel.
Machining & Tolerance:
CNC vertical machining centers hold critical tolerances on air-valve bores within +/-0.01 mm, ensuring consistent air-shuttle performance and minimal blow-by.
Testing Protocol:
Every assembled pump undergoes a 30-minute dry-run and pressure test using compressed air and water test-benches before packaging to verify check-valve seating and diaphragm integrity.
Surface Finish:
Available in standard industrial finish (Ra < 3.2 um) or sanitary electro-polished finish (Ra < 0.6 um) for food and pharmaceutical compliance.
Procurement Decision & Ordering Information
When issuing a Request for Quotation (RFQ) or Purchase Order (PO), define the following technical parameters to expedite fulfillment:
Model Nomenclature Example: SS10-PT-PT-TF
• SS10: 1-inch 316L Stainless Steel
• PT: PTFE Diaphragm
• PT: PTFE Check Balls
• TF: PTFE Valve Seats
Standard Lead Time: 5 to 10 business days for standard configurations; custom elastomer builds ship within 15 business days.
Packaging & Export: Secured to ISPM 15 heat-treated wooden pallets, sealed in heavy-duty poly bags with desiccant packs to prevent transit corrosion.
Request a Technical Quote
Provide your fluid parameters to receive a verified pump sizing calculation and formal quotation within 24 hours.
• Required Inputs: Fluid Name, Viscosity (cPs), Temperature (°C), Specific Gravity, Required Flow Rate (GPM/LPM), and Discharge Head (PSI/Bar).
• [Submit Specification Sheet / Request Engineering Drawing (STEP/IGES)]
Frequently Asked Questions
Q: What is the difference between 304 and 316L stainless steel for this pump?
A: 304 stainless steel contains 18% chromium and 8% nickel, suitable for general industrial water and mild chemical washdowns. 316L contains 2% to 3% molybdenum, providing superior resistance to pitting corrosion from chlorides, saltwater, and strong acids like acetic or phosphoric acid.
Q: Can this pump run dry continuously without causing mechanical damage?
A: Yes. Because it lacks dynamic rotating mechanical seals or close-tolerance gears, running dry generates no frictional heat buildup that would seize or score internal components.
Q: How do I prevent air-valve icing in high-humidity operating conditions?
A: Air-valve icing occurs due to rapid expansion of compressed air. Install an inline air filter/regulator/lubricator (FRL) with a water separator, or adjust the operating air pressure downward if full flow is not required.
Q: What is the maximum particle size the stainless steel pump can handle?
A: Particle passing capability scales with port size. A 1-inch pump safely passes suspended solids up to 1/8 inch (3.2 mm) in diameter without lodging in the check valve assembly.
Q: Are replacement diaphragms and check balls interchangeable with major brands?
A: Yes. Our internal fluid path and bolt patterns adhere to standard global industrial dimensions, allowing direct drop-in replacement for existing legacy installations without piping modifications.
Q: What certifications are available for food and pharmaceutical applications?
A: Food-grade models feature FDA-compliant virgin PTFE elastomers, sanitary Tri-Clamp fluid connections, and surface finishes certified to EHEDG or 3-A sanitary standards upon request.
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