Q&As
What is the operating principle of ANEST IWATA Double Diaphragm Pumps?
ANEST IWATA Double Diaphragm Pumps operate on a pneumatic drive principle. Compressed air is alternately directed to the rear chambers of two flexible diaphragms connected by a common shaft.
The reciprocating motion of the diaphragms creates alternating suction and discharge strokes, allowing the fluid to be drawn in and expelled through non-return valves. This design provides a continuous and stable flow rate without the use of electrical or mechanical drive components in contact with the fluid.
What are the main advantages of the Double Diaphragm Pumps compared to other pump types (e.g., piston pumps)?
Dry-run capability: the pump can operate without fluid without causing mechanical damage.
Excellent chemical resistance: achieved through the use of PTFE diaphragms and chemically resistant wetted parts.
Handling of high-viscosity fluids: suitable for products containing pigments or small solid particles.
Simplified maintenance: few moving parts and easy access to internal components.
No fluid contamination: there are no dynamic seals or lubricated components in contact with the pumped medium.
Which systems can be supplied by ANEST IWATA Double Diaphragm Pumps?
ANEST IWATA Double Diaphragm Pumps are typically employed for:
• Feeding spray guns (manual or automatic).
• Paint circulation systems in closed-loop installations.
• Transfer operations between storage tanks or supply containers.
• Frequently incorporated into two-component mixing systems.
Which coating materials can be delivered using ANEST IWATA Diaphragm Pumps?
ANEST IWATA Double Diaphragm Pumps are engineered to handle a broad range of coating materials, benefiting from the chemical compatibility of their construction materials and their ability to manage various viscosity levels. The choice of pump body material determines the suitability for different applications:
Anodized aluminum: recommended for waterborne coatings, primers, and non-aggressive materials.
Stainless steel: suitable for solvent-borne coatings, corrosive products, and chemically reactive fluids where maximum resistance and durability are required.
What are the main differences between the 2 versions of the Anest Iwata DDP‑90F and DDP‑120B Double Diaphragm Pumps?
The different versions indicate different flow capacities.
• DDP 90F: Up to ~ 10 L/min output for medium version.
• DDP 120B: Up to ~ 30 L/min for large version.
The different versions indicate different performances.
• DDP-90 → Medium capacity, more versatile for medium paints viscosities.
• DDP-120 → High flow rate, ideal for industrial applications or high panits viscosities.