Diaphragm minimum pressure valve

Back Pressure Valves Prevents overfeeding and siphoning phenomenon. The overfeeding phenomenon and the siphoning phenomenon are prevented by sealing the piping outlet with a diaphragm and applying just enough force (back pressure) to overcome the force of inertia of the liquid. Overfeeding Phenomenon A phenomenon that occurs in flows with pulsation. With this phenomenon, liquid continues owing even when it should be stopped and is discharged at a volume larger than the rated volume due to the discharge momentum (inertia). Siphoning Phenomenon A phenomenon where the chemical is naturally sucked out and continues to ow even when the pump is stopped because the position of the end of the pump's discharge-side piping is lower than the level of the liquid in the suction-side tank.