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Figure 11: Pictorial representation of functioning of a gravitational valve. Black arrow represents the direction of CSF flow. There are two separate chambers communicating with each other across a U bend – one side with a simple ball - spring valve and the other side with 2-4 metal balls guarding a conical opening. (a) When the patient is recumbent, CSF flows freely through both the chambers. (b) When the patient's position is vertical, CSF flows as usual through the ball-spring valve but the weight of the metal balls blocks the conical opening in the other chamber. For CSF to cross this chamber, therefore, adequate pressure has to be generated by the CSF flowing across the valve to lift the metallic balls, or else, flow will not occur across this half of the chamber

Figure 11: Pictorial representation of functioning of a gravitational valve. Black arrow represents the direction of CSF flow. There are two separate chambers communicating with each other across a U bend – one side with a simple ball - spring valve and the other side with 2-4 metal balls guarding a conical opening. (a) When the patient is recumbent, CSF flows freely through both the chambers. (b) When the patient's position is vertical, CSF flows as usual through the ball-spring valve but the weight of the metal balls blocks the conical opening in the other chamber. For CSF to cross this chamber, therefore, adequate pressure has to be generated by the CSF flowing across the valve to lift the metallic balls, or else, flow will not occur across this half of the chamber