The invention discloses a quantitative
aerosol valve with an ultra-large
spray volume, comprising a pressing head, a
nozzle, a sealing cup, an inner
gasket, a
valve stem, a spring and a valve chamber, wherein the upper end of the valve chamber is fixed on the inner side of a fixing cap of the sealing cup, an air
inlet channel is provided between the fixing cap and the upper port of the valve chamber, the inner
gasket is sleeved on the outer side of the
valve stem and fixed between the upper port of the valve chamber and the fixing cap to seal the upper port of the valve chamber, the valve chamber is a hollow columnar structure with a closed lower end, a column platform is provided inside the valve chamber, which protrudes upward from the bottom to the middle position, an inner channel is provided in the column platform, a
straw is inserted at the lower part of the inner channel, an inner port communicating with the inner cavity of the valve chamber is provided at the top, an annular
thin sheet is provided on the edge of the inner port, the lower end of the
valve stem passes through the inner port and is inserted into the inner channel, and the lower end of the valve stem is provided with a slope surface which is interference-fitted with the annular
thin sheet to realize sealing, the valve stem is an inner hollow structure with an open upper end and a closed lower end, and is provided with an inlet located above the inner
gasket, and has an ultra-large
spray volume under the condition of small
volume change.