Patent ID: 8361417

Claim:
A valve for insertion into a container for centriftigation, the valve comprising: (a) a first component comprising: (1) a base comprising one or more prongs; (2) a spring coupled with the base; and (3) a substantially cylindrical plug coupled with the spring; wherein the spring is responsive to a first centrifugal force during centrifugation and operative to move downwardly along an axial direction of the container; (b) a second component comprising: (1) a substantially cylindrical housing; and (2) a central passage allowing bidirectional mixture movement through the second component; wherein the second component is responsive to the first centrifugal force and operative to move downwardly along the axial direction of the container until it is stopped by the one or more prongs; wherein the spring is further responsive to a second centrifugal force following the first centrifugal force and operative to move upwardly along the axial direction of the container and enter the central passage thereby preventing bidirectional mixture movement through the second component.