GM and GB series mechanical diaphragm metering pump (chemical dosing pump) is widely used in petroleum, chemical industry, spinning, food industry, papermaking, atomic energy, power plants, plastics, pharmacy, water works, environmental protection or other industries. It could pump liquid to pressurized container or atmospheric container with accurate measuring. Medium can be corrosive and high viscosity, and should be without solid and with viscosity range of 0.3~800 mm2/s.

Mechanical diaphragm metering pump has a diaphragm through which repeated compression/decompression motion is transmitted. The liquid does not penetrate through the diaphragm, so the liquid inside the pump is sealed off from the outside. Such motion changes the volume of a chamber in the pump head so that liquid enters through an inlet check valve during decompression and exits through an outlet check valve during compression, in a manner similar to piston pumps.