| 摘要 |
<p>An apparatus for feeding and metering fluid components to a mixing head, in particular for metering and feeding reactive chemical components (A, B) to a high pressure mixing head (10).</p><p>The apparatus comprises at least a first (17) and a second (18) transfer cylinder whose control unit (25, 26) is fed with hydraulic fluid under constant pressure, and whose component pumping unit (23, 24) is connected to a tank (11, 12) for the component (A, B), respectively to an inlet aperture (21a, 22a) for the component in a chamber (10a) of the mixing head (10), by means of a proportional servo-valve (21, 22) which is controlled in relation to the rate of flow of the components so as to keep both the pressures and the flow of the components to be mixed constant.</p> |
