Diaphram pump performance curves may be downloaded in the downloads tabs of individual part numbers. View our air-operated diaphragm pumps and other pump products.
You must know the following data:
Using the performance chart for a 1/2” pump shown. If 80 psi is available at the air inlet and the required capacity of the pump is 6 GPM. Follow the blue concave curve at 80 psi as it slopes to the right and intersects with the 6 GPM vertical line. By tracking horizontally back to the left (Y) axis, the discharge pressure is ascertained—65 psi . (Right axis converts PSI to feet/meters).
Reverse the steps above:
Choose required discharge pressure (65 psi) on left (Y) axis, go directly across the graph to the intersection of the correct flow rate (6 GPM) , then track up and back toward the left (Y) axis along the blue curve; and the correct required air pressure can be obtained (80 psi).
Note: If greater outlet pressure vs. air inlet pressure is required—select a larger pump.
The convex red lines represent the air consumption (standard cubic feet per minute), and the closest red line to where the blue line and the flow rate intersect represents the air capacity required. On our example, the air consumption would be approximately 6 SCFM.
To convert SCFM to m3/h (N) multiply by 1.7