| CPC F16K 13/10 (2013.01) [B08B 9/08 (2013.01); B08B 2209/08 (2013.01)] | 19 Claims |

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1. A method of flow adjustment, the method comprising:
allowing fluid to flow through an opening in a container, wherein magnetically sensitive particles are confined within the container;
applying a magnetic field to move the magnetically sensitive particles in the container to adjust flow of the fluid through the opening; and
resetting positions of the magnetically sensitive particles using a biasing structure.
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