In the closed position the valve guarantees the complete sealing of the infusion system up to 35psi. This means that the valve does not allow any solution to exit unless a pressure higher than 35psi is created.
When the Luer Lock component for example a syringe is connected, the valve opens allowing flow through the system. The SILICONE stem guarantees a perfect seal between the syringe or any LUER LOCK connector and valve. The valve has no obstructions in the flow path which minimizes any risk of haemolysis, and allows high flow rates.