| 摘要 |
A pump/valve assembly forming part of a circuit for circulating a liquid fluid has a pump and a proportional-control valve unit ( 2 ) in series with the pump. The valve unit ( 2 ) has a valve ( 3 ), an electrical actuator ( 4 ) and a position sensor ( 5 ) which are fixed to a movable member ( 3 ') sealing the valve ( 3 ) for displacement therewith, and control means ( 6 ) controlling the actuator ( 4 ) according to the position of the movable member ( 3 ') indicated by the sensor ( 5 ) and a reference signal. The valve unit ( 2 ) is subjected to a procedure indexing the position of the movable member ( 3 ') and setting parameters for the control means ( 6 ) at the beginning of each new operating cycle of the assembly, and the pump ( 1 ) is rotated at a constant speed selected from a limited number of predetermined speeds at least during part of each operating cycle.
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