D20T2.8 75mcl Dosage 20mm Aerosol Metered Valve for Air Dispenser

75mcl (microliters) refers to the volume of formulation released per single actuation of the valve stem. In a metered valve, this volume is determined by the internal metering chamber, not by actuation duration. Each depression of the actuator delivers exactly 75mcl regardless of how quickly or slowly the stem is pressed, providing consistent output for programmed dispensing cycles.

The valve is designed for the 20mm crimp-on aerosol neck, which is the most widely used standard in air dispenser product lines. However, compatibility also depends on the container's internal pressure rating, bead height, and gasket groove dimensions. Verify these parameters against the valve's technical datasheet before production runs, particularly when switching container suppliers.

The D20T2.8 is generally compatible with hydrocarbon propellants (LPG blends such as propane/butane/isobutane) and compressed gas propellants (nitrogen, CO2) at standard aerosol operating pressures. Compatibility with HFA (hydrofluoroalkane) propellants or dimethyl ether should be confirmed based on seal material grades. Always request material compatibility documentation when using aggressive or novel propellant systems.

Yes, the D20T2.8 can be used with water-based aerosol formulations, but specific material grades and spring alloys should be selected to prevent corrosion from extended contact with aqueous products. For water-based or high-moisture formulations, specify stainless steel spring components and confirm that the stem and body polymer are rated for hydrolytic stability over the product's expected shelf life.

Dose weight testing is the standard method: a filled and crimped unit is weighed before and after a defined number of actuations (typically 10), and the average output per actuation is calculated by dividing total mass discharged by number of shots. For gravimetric testing, account for propellant volatility by conducting measurements in a controlled environment. Statistical process control on a sample basis is recommended for batch release in regulated industries.

Shelf life of the assembled product depends on the formulation, propellant, container material, and storage conditions rather than the valve alone. Metered valves of this class are typically designed to maintain seal integrity for 2–3 years under standard storage conditions (15–30 degrees Celsius, away from direct sunlight). Accelerated aging studies at elevated temperature are the standard method for predicting field shelf life and should be conducted on the complete filled unit, not the valve in isolation.