| 摘要 |
A spray head (26) for use with a can (10) containing a liquid (11) exposed to the pressure of a propellant (12). The spray head being disposed on the free end of a dispensing tube (21) of a dispensing valve, especially an aerosol valve (15), and including a spray nozzle (27) in fluid communication (28) with the discharge duct (23) of the dispensing tube (21). The fluid communication (28) includes therein a throttle member (29) with a resiliently biased throttle body (30) which has one side exposed to ambient pressure while the overpressure prevailing in the can interior acts on the other side thereof and through which the flow cross-section (31) can be controlled in dependence on the overpressure in the can such that an approximately constant discharge rate per unit of time through the spray nozzle (27) is achieved until the can (10) is substantially emptied. The resilient bias of the throttle body (30) is inherent in the throttle member and is effective only during use of the device such that at maximum over-pressure in the can a minimum flow cross-section (31) is kept open.
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