| 摘要 |
PCT No. PCT/CH81/00089 Sec. 371 Date Apr. 5, 1982 Sec. 102(e) Date Aug. 5, 1982 PCT Filed Aug. 6, 1981 PCT Pub. No. WO82/00450 PCT Pub. Date Feb. 18, 1982.By the displacement, depending on the pressure change in the container (22), of a piston (8) in order to open or obturate a bore (9) in the product conduit (7), the amount of product flowing per unit of time through the opened valve (1) is maintained constant even when the pressure in the container (22) diminishes. The piston (8) is so displaced by the pressure prevailing in the container (22) via a diaphragm (12) against a restoring force (21) that the bore (9) defines, at the time of the highest pressure prevailing in the container (22), a smallest predetermined opening for the product flow. By an adequate choice of the shape of the bore (9), the thrust of the product flowing through the opened valve (1) can thereby be maintained constant, which leads to a constant quality of atomization of the product (23) through a spray nozzle.
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