1. Patients position When patient lying down at horizontal position, pressure(high, medium or low) will be controlled via pressure membrane of the valve. 2. Function of slit valve When patients position is changing uplifting to vertical position(sitting or standing position), theres negative pressure caused by changing the posture. The fluid drainage will be controlled efficiently by the slit valve at the distal end of the Peritoneal Catheter. 3. Anti-siphon effect There are double pressure membranes to control the flow in only one direction and avoid over drainage by preventing siphoning effect.