Pump Solutions Group Neptune Series 500 dia-PUMP How It Works - Manual

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Variable Oil By-pass TM stroke adjustment allows
better valve performance than variable linkage
designs. The valve checks have extra time to
seat even in heavy liquids since they are idle
during the by-pass portion of the suction
and discharge strokes.
How It Works
Hollow piston reciprocates within a cylinder.
Metering rod fits into the piston. Note the front
of the piston, or “nose”, has a reduced diameter.
The liquid seal forms at
where the full diameter
of the piston contacts the cylinder.
When the piston moves forward, oil by-passes over
the reduced nose, through port
to the center of
the piston and back to the gearbox. As the piston
continues forward, port
is blocked by the tip of
the metering rod stopping the by-pass. Oil is
now pushed through port to the diaphragm.
Neptune
Series 500
“dia-PUMP”
The only pumps with
EZE-CLEAN
TM Valves
Hydraulically balanced Teflon ®
diaphragm eliminates diaphragm
stress associated with mechani-
cally flexed units.
EZE-CLEAN TM Valves—
Cartridges can be removed
for cleaning without
disturbing the piping
to the pump.
Adjustable while
running through
100% of range by
micrometer dial.
Internal relief valve protects pump and motor.
Antisiphon spring provides
back pressure when pumping
against low pressure.
Vent—Refill mechanism
operates once per stroke.
Power train
operates in oil for
extended service.
Turning the micrometer dial moves the metering rod
and changes the pump capacity. When the metering
rod is moved in, the tip of the metering rod closes port
sooner in the stroke allowing for less by-pass and more pumping action.
Likewise, when the metering rod is moved out, the tip of the metering rod
closes port
later in the stroke allowing more by-pass and less pumping.
The motion of the piston pushes and pulls the hydraulic fluid through port ,
into and out of the diaphragm chamber. The action of the fluid pushes and
pulls the diaphragm which, in turn, pushes and pulls chemical through port
.
The action of the check valves controls the direction of the liquid.
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