4
3. Principle of Operation
①Charge (standby)
Material, under pressure from a supply
pump, flows into the rear side of the piston
and constantly pushes the piston forward. At
the same time, material passes through Port
A, lifts up the ball to close Port B, and flows
into the metering chamber. Material in the
metering chamber pushes the piston
backward and thus a metered shot is
charged. The amount of material can be
adjusted to your desirable value with the
adjustment screw. (Fig. 2)
②Discharge
Once the lever is pulled, the piston rod
pushes down the ball to close Port A. Then,
the metering chamber is connected to the
discharge port. The piston is pushed forward
by material pressure from the rear side and
thus a metered shot in the chamber is
finally discharged. (Fig.3)
Adjustment screw Rod
Metering chamber
Fig. 3
Fig.4
Fig.5
Fig.6
Three way directional valve
①Material comes from the bottom seat lifts up
the ball and flows out of the middle path. The
ball is pressed against the upper seat to close
the outlet so that material will not be
discharged from the upper side.
②The piston rod pushes the ball down. Since
the ball goes down, being sealed by the
rubber in the middle, material will not flow
out even after the ball moves away from the
upper seat.
③Furthermore, the ball passes through the
path in the middle and seals the inlet on the
bottom seat to stop the flow of material.
Accordingly, the middle path and outlet on
the upper seat are connected and finally
material flows out.
Fig. 2
Lock nut Port B
Port A
