The diaphragm valve is essentially a simple pinch clamp, closed by pressing a flexible diaphragm against transverse weir, when fully closed, the diaphragm seats against the weir providing a leak tight closure. The diaphragm valves are recommended for handling sticky and viscous fluids, slurries and highly corrosive and hazardous substances and other hard to handle mediums or where tight closure is prime factor. It is the most ideal valve to handle fluids that require high purity and should remain free from contamination. The diaphragm valve is a simple pinch type valve and of low pressure type because of large area of diaphragm and is extensively used for both onoff and throttling services and finds its application in waste & water treatment plants, filtration plants, chlorination plants etc