| 摘要 |
The present invention relates to a metered dose aerosol valve, comprising: an internal valve body, a dose-metering valve chamber arranged inside the internal valve body, and an internal valve stem axially penetrating the dose-metering valve chamber; a middle part of the internal valve stem is provided with an annular boss, a first gasket is fixedly arranged on the dose-metering valve chamber, and the first gasket matches an upper stem body, located above the annular boss, of the internal valve stem in a sealing manner; the upper stem body is provided with radially distributed liquid inlet holes and axially distributed liquid discharge holes; a bottom of the liquid discharge hole is in communication with the liquid inlet hole; a lower stem body, located below the annular boss, of the internal valve stem is provided with a first annular conical face, an end opening at a bottom of the dose-metering valve chamber is provided with a second annular conical face, and the first and second annular conical faces are vertically opposite to each other; and when the internal valve stem is pressed down, and the internal valve stem is moved down until the liquid inlet hole on the internal valve stem is located below the first gasket, the first and second annular conical faces are adapted to match each other in a sealing manner, so it is possible to only spray out liquid inside the dose-metering valve chamber, thereby implementing a metered dose aerosol spraying function. |
