| 摘要 |
1,215,621. Valves. D.B.A. 5 Jan., 1968 [6 Jan., 1967], No. 747/68. Heading F2V. A flow-regulating valve comprises a distributer 2 within a body 1 having N inlets (three 5, 6, 7 being shown), each inlet being dimensioned to deliver a flow rate equal to respectively where I is the maximum flow from the valve. The distributer has N sections, each section acting in conjunction with an inlet and having a number of equally spaced closure members 13, 14, 15 corresponding to 2<SP>x-1</SP>, where x equals the number 1 to N of the section. A complete revolution of the distributer 2 opens and closes the inlets in all the 2<SP>N</SP> possible combinations to give an output flow variable in discrete steps. The distributer 2 is rotated by a step by step electric motor positioned by a digital computor. The distributer may be a cylinder or prism. In another embodiment (not shown) the distributer is axially movable by a gear and rack and has an axial arrangement of closure members. |
