Hydraulically-operated diaphragm-type and double-diaphragm type matering pumps these are suitable for service conditions having hazardous toxic, radio active or poisonous liquid where product leakage is not at all allowed. The diaphragm is hydraulically balance. With the liquid being pumped on one side and actuating fluid on the opposite side, its function is that of a partition. The system is safe gauarded by an inbuilt relief vacuum valve on the hydraulic side. For very severe duty conditions or when handling slurry or hot liquids, double diaphragm and remote type head can be supplied. These pumps are used for precise dosing and mixing of slurries , alkalies acids, viscous liquids, etc. They are also used in chemical plants fertiliser plants water treatment plants, soap plants, paper industries, pharmaceutical industries, thermal power projects and plastic industries.