GENERAL
The Series G Model " B " pumps are reciprocating, chemical dosing pumps capable of producing
controlled flows up to 1800 liters per hour at pressures up to 10 BAR (depending on the model). These
pumps feature a mechanically actuated diaphragm, which eliminates the need for contour plates, and a
stroke adjustment mechanism based on the variable eccentric principle instead of the traditional lost motion
design. This design substantially reduces pressure and flow pulsations contributing to an increase in the life
of system components and more continuous chemical injection. It is designed for industrial service and
offers an accuracy of ±1.5% of 100% rated flow between 10% and 100% of its flow range.
PRINCIPLE OF OPERATION
The pump consists of two major assemblies; the drive and the liquid end. Pump delivery is a function of
the drive's stroke rate, liquid end size and stroke length. Stroke length can be adjusted while the pump is
running or stopped by turning the stroke adjusting knob.
The drive motor transmits rotary motion to a worm gear speed reduction unit which in turn drives the
variable eccentric crank. The adjustable crank imparts reciprocating motion to the diaphragm through an
interposing connecting rod. The stroke length is adjusted by changing the position of the variable eccentric
crank in the connecting rod assembly.
As the diaphragm starts back on the suction stroke, the pressure immediately drops inside the liquid end.
When the liquid end pressure drops below the suction line pressure, the suction ball check is " pushed
"upward and the process fluid in the suction line flows into the liquid end chamber. When the suction stroke
ends, the diaphragm movement momentarily stops. The pressure in the liquid end equalizes with the
pressure in the suction line and the suction ball check seats.
NOTE:
It is important that the pressure in the liquid end remain above the vapor pressure of the process fluid
during the suction stroke. If the fluid pressure drops below the vapor pressure, cavitation will occur,
negatively impacting the performance of the pump. If you suspect the possibility of cavitation, contact
your Milton Roy Representative for assistance.
As the diaphrag m starts forward on the discharge stroke, the pressure immediately rises inside the liquid
end. When the liquid end pressure rises above the discharge line pressure, the discharge ball check is "
pushed "upward and the process fluid in the liquid end flows into the discharge line. When the discharge
stroke ends, the diaphragm momentarily stops again. The pressure in the liquid end equalizes with the
discharge line pressure and the discharge ball check reset. The cycle then starts again.
GENERAL SPECIFICATIONS
Flow Rate
Up to 1800 L/H
Pressure
Up to 10 BAR
Design
Mechanically Actuated Diaphragm
Drive
Variable Eccentric
SECTION 1
DESCRIPTION
1
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