A diaphragm metering pump uses a flexing diaphragm, driven by a motor and crank or solenoid mechanism, to displace a precise volume of chemical with each stroke, while the diaphragm itself keeps the process fluid completely isolated from the pump’s mechanical components. This isolation is what makes diaphragm pumps the standard choice for dosing hazardous, corrosive, or expensive chemicals, there’s no packing or seal in direct contact with the fluid that could wear, leak, or require routine replacement. Stroke length and stroke frequency can both be adjusted, independently or together, giving a wide turndown range from a single pump without needing to swap components for different flow rate requirements.