| 摘要 |
<p>There is provided a proportioning device for connection to a main line carrying a pressurized fluid, for the purpose of introducing into or drawing from the main line a fluid at a rate standing in a substantially constant proportion to the flow rate of the main line. The device comprises a housing, at least one opening of which is connected to the main line and another opening of which is connected to the proportioning branch line. The device comprises a valve arranged in the housing and capable of closing the passage of the fluid into and from the proportioning branch line. The valve is mechanically linked to two drag bodies, the first one of which is located in the flow path of the main line, the second one in the flow path leading to the proportioning branch line, to such effect that the drag force acting on the first drag body tends to open the valve and thus to increase the flow through the proportioning branch, while the drag force acting on the second drag body tends to close the valve and thus to reduce the flow through the proportioning branch.</p> |
