| 摘要 |
<p>A proportioning device for the admixture of an additive fluid into a fluid medium flowing in a pipe or conduit. The flow rate of the fluid medium is measured and the pump which introduces the additive fluid is controlled in response to the measured flow rate. The measuring system includes a body disposed to be moved linearly against the force of a spring by the fluid medium passing thereby. In one embodiment, this body has a surface which varies along its length and the additive fluid pump has a plunger in contact with this surface. As the body is moved by the varying flow rates of the fluid medium, the effective plunging stroke of the pump is controlled. In another embodiment, a magnetic field is used to detect changes in the position of the body.</p> |
