Pump Solutions Group Neptune - Manual (Page 6)

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Variable oil by-pass™ stroke adjustment allows better valve performance than
variable linkage designs.
the valve checks have extra time to seat even in vis-
cous liquids since they are idle during the by-pass portion of the suction and
discharge strokes.
How it Works
Hollow piston 1 reciprocates within a cylinder. Metering rod 2 fits into the
piston. note the front of the piston, or “nose”, has a reduced diameter. the liq-
uid seal forms at
3 where the full diameter of the piston contacts the cylinder.
When the piston moves forward, oil by-passes over the reduced nose, through
port
4 to the center of the piston and back to the gearbox. as the piston con-
tinues forward, port 4 is blocked by the tip of the metering rod 2 stopping
the by-pass. oil is now pushed through port 5 to the diaphragm.
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
4 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
4 later in the stroke allowing more by-pass
and less pumping.
the motion of the piston pushes and pulls the hydraulic fluid through port
5 , 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
6 . the action of the check valves controls the direction of the liquid.
Hydraulically balanced teflon® diaphragm
eliminates diaphragm stress associated with
mechanically flexed units.
antisiphon spring provides back pressure
when pumping against low pressure.
EZE-CLEAN™ 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.
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