| 摘要 |
The present invention relates to a component-feed nozzle for use with a reactive-mixing head of a reactive-injection apparatus encompassing a housing (12, 13) with a component-inlet (18) and with a nozzle-shaped component-outlet (15), and to a seal (16, 17) inserted in the housing (12, 13) by means of a drive (30) so as to be displaceable between at least two positions, where, in a first position, the seal (16) seals the component-outlet (15), and in a second position the component-outlet (15) is free and there is a flow connection between the component-inlet (18) and the component-outlet (15). In order to avoid surmounting a reactive force during a displacement, it is proposed that there is a seal-and-throttle unit (16, 17) which has at least one area of a first type (A1, A3) and one area of a second type (A2), which on application of the component pressure generate a force in an opposite direction, where the sizes of the areas (A1, A2, A3) have been selected in such a way that the opposed forces substantially offset one another.
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