| 摘要 |
An aerosol valve has a housing with a main flow passage at its inner end and an annular seal at its outer end. A valve stem extends through the seal and is movable inwards against a coil spring to open the valve in normal use, and to permit pressure filling by inward deflection of the seal. The internal cross section of the housing over a substantial part of its length is square and flow channels extend from corners of the square through the housing around the outside of the coil spring. Specific characteristics of the seal and spring are stated. |
