Chemical Pumps - Four Pump Series
- JN Series: 5 models from 1 to 7 GPH (4-28 L/hr), simplex,
duplex and triplex chemical pumps available.
- MF Series: 11 models from 5 to 90 GPH (19-340 L/hr), ),
simplex, duplex, triplex and quadruplex chemical pumps available
- MH Series: 5 models from 96 to 180 GPH (363-681 L/hr), ),
simplex and duplex chemical pumps available
- JR series
has been superseded by the JN Series. While fully
supported, it is no longer being sold.
 Madden chemical pumps are designed for demanding industrial
jobs where chemicals must be pumped all day, every day. Engineered materials are used for the wetted end to pump
virtually any chemical, from acids to caustics. Even viscous
liquids and suspended solids can be pumped with volume controlled
accuracy.
Extremely Accurate
Repetitive accuracy of +/- 1% over a 10:1 turndown ratio is
achieved with a convenient stroke adjustment knob located
on the top of the pump.
Durable, Low Upkeep
The mechanically actuated diaphragm system eliminates
annoying hydraulic systems and packing glands used in many chemical
pumps. Large bearings and shafts, continuously lubricated with
a bath of oil give years of dependable service. Precision
bronze worm gears and steel worm drive shafts convert motor rpms
to linear piston pumping power. Replacing worn parts is fast and
simple, with common tools.
 Chemical pumps by Madden are heavy duty industrial grade,
using standard industrial 56 frame motors and worm gear reducers
to produce reliable pumping power designed to provide many years
of dependable service. Rugged aluminum gear box and pump body
castings, precision machined and bolted assembly. Wetted end
parts made from a selection of corrosion resistant materials.
Thick Nylon reinforced diaphragms for tough pumping service.
Industrial grade 56 frame electrical motors are available to
meet any enclosure and power supply need.
How does a Madden chemical pump work?
The Madden diaphragm type chemical pumps are positive displacement
chemical pumps that allow the operator to adjust the displacement of
the pump which changes the output rate. Madden pumps are “lost motion”
type pumps which use a piston to mechanically move a rubber diaphragm
that is the barrier separating the liquid from the inner workings of the pump.
An electric motor drives a worm gear speed reducer that in turn turns a
shaft with an eccentric installed on the shaft. As the eccentric moves
forward the piston is pushed forward, along with the diaphragm, and the
liquid that is in the wetted end of the pump is pushed out through the
discharge check valve and into the piping going to the industrial process.
As the eccentric continues to rotate through a 360 degree cycle it will
eventually push the piston rod rearward, which pulls the diaphragm rearward.
That rearward action creates a vacuum in the wetted end of the pump resulting
in the chemical liquid being sucked into the wetted end through the suction
side check valve.
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