Air operated double diaphragm AODD pump pneumatic

Air-driven double-diaphragm pump designed for industrial fluid transfer where compressed air is the power source. The pump uses an improved air distribution system that replaces traditional O‑ring and cylindrical valve assemblies with a three‑way operated valve. This design eliminates valve dead‑center and reduces pump stops, enabling faster reversal, higher effective flow rates, smaller pulsation and a more stable discharge.

Key features

• Pneumatically powered — operates from a compressed air supply (no electrical motor required).
• Improved three‑way air valve to avoid dead‑center stops and deliver consistent, reliable directional switching.
• Low pulsation, stable flow for easier downstream handling and reduced pressure spikes.
• Capable of handling corrosive, volatile, flammable or toxic liquids, fluids containing solids/particles and high‑viscosity media.

Available ports (inlet/outlet)

• 6 mm (1/4"), 10 mm (3/8"), 15 mm (1/2"), 20 mm (3/4"), 25 mm (1"), 40 mm (1.5"), 50 mm (2"), 80 mm (3"), 100 mm (4").

Construction materials (select per application)

• Pump body: Acetal (POM), Polypropylene (PP), Aluminum alloy, Stainless steel (SS304, SS316), PVDF, Ductile iron.
• Diaphragm: Hytrel, Santoprene, PTFE, Buna‑N (Nitrile), Viton (FKM), Geolast.
• Valve ball / valve seat: Acetal, PP, Aluminum alloy, SS304, SS316, Hytrel, PVDF, PTFE, Buna‑N, Viton, Geolast.

Typical applications

• Chemical processing and petrochemicals
• Paints, coatings and inks
• Ceramics and minerals processing
• Metallurgy and surface finishing
• Environmental / wastewater handling
• Pharmaceutical and specialty‑chemicals transfer

Ordering and selection guidance

• Choose pump body and wetted materials to match the chemical compatibility, temperature and abrasion characteristics of the fluid.
• Select diaphragm and valve materials based on required chemical resistance, flexibility and expected service life.
• Specify port size based on required flow, line size and solids content.
• Provide fluid properties (chemical composition, viscosity, solids concentration and particle size, temperature and required flow/pressure) so the right construction and model can be recommended.

Model example provided: RW50PPFF (refer to the supplier model for exact configuration and performance data). For technical data sheets, performance curves and material compatibility guidance, request the pump specification corresponding to your fluid and operating conditions.