In mining, industrial, and general manufacturing plants where electricity is unavailable diaphragm pumps are extensively used. Also, these pumps are highly used in explosive or flammable areas for pumping applications of viscous or difficult fluids like fuels, glues, paints, resins, inks, dewatering underground coal mines, and also in the processing of food-based or cosmetic liquids. The specific feature of a diaphragm pump is it creates a vacuum in the inlet when it is pumping so it can be mounted over the liquid it is pumping.