Chemical Metering Pumps

Chemical Metering Pumps

Chemical metering pumps are used to pump liquid chemicals at precise flow rates. There are three basic parts of a chemical metering pump: a pump head, a piston, and an electric motor. The electric motor is used to power the piston, which displaces liquid by moving in and out of the pump head.

The pump head of chemical metering pumps is a cylindrical chamber similar in length to the pump's piston. It is usually just a bit larger around than the piston, so that the piston can easily slide in and out of the piston head with minimal excess area where fluid can be displaced. Inlet and outlet lines are attached to the piston head chamber, one to supply the chemicals and one to allow them to escape after being displaced. The inlet valve allows flow into the chamber but not out, whereas the outlet valve allows flow from the chamber out of the pump, but not in the reverse direction.

The concept behind a chemical metering pump's operation is simple. When the piston moves out of the chamber, a vacuum is created, and when the piston moves back into the pump head, the liquid in the chamber is pressurized. Chemical metering pumps are available in a variety of pressure and temperature ratings and should be selected in consideration of the liquid being pumped and the application for which the pump will be used.

Chemical Metering Pumps Images Provided by LMI Milton Roy