Metering pump has a variety of uses. Mainly seen in the chemical industry, they are made to accurately pump liquids at adjustable levels. There is more than one type of pump considered a metering pump.
Types
Perhaps the most popular metering pumps are piston and diaphragm types. Positive displacement pump operate with reciprocating pistons that move in and out of a comparably sized cylindrical chamber. Diaphragm pumps have reciprocating diaphragms that compress and decompress to move liquid. plunger pump is used in cases where the liquid being pumped is too toxic to risk leakage, because their design makes them less susceptible to leaks.
Function
With both mechanical piston and diaphragm pumps, the flow rate can be adjusted by changing the stroke length.
Price
Metering pump prices vary greatly. Diaphragm pumps are more expensive than piston-type pumps. The determining factor of price is horsepower. Large flow and head requirements require a larger-horsepower pump and therefore increase the pump cost greatly. As an example of price, in 2010 a 1-horsepower, 125-gallon-per-hour diaphragm cost about $5,000.
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