| 摘要 |
The valve, comprising a plate (11) covering at least one fluid circulation port (4) in a base (10), has its resistance regulated by an elastic ring (2) applying a pressure on the plate. The ring (2) is in the form of a toroid or spiral metal spring with ends joined, and its diameter is varied by pressure from a regulating component (3) with a conical thrust surface (6) in contact with the ring.
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