Principle Of Operation - YAMADA KGK-400 Series Instruction

3. Principle of Operation

3-1 Standby
Valve
バ ル ブ
Material Inlet
液入口
Material delivered to the supply channel lifts up the valve
with its pressure and presses it against the seat on the
discharge side. While the valve is blocking material flow to
the discharge port, Chamber A (metering chamber) becomes
filled with material.
At the same time, material, under pressure from a supply
pump, is constantly being delivered to Chamber B (pressing
chamber) at the back of the metering piston through a bypass
groove around the valve.
At this time, when the same pressure is applied over both
Chamber A and B, the force acting on Chamber A is stronger
due to a difference of pressure receiving area.
Thus, the metering piston is pushed to Chamber B and
comes to a stop against the head of adjustment screw.
3-3 Completion
Air Inlet
操作空気
Discharge end
吐出完了
Valve
バルブ
Material Inlet
液入口
The metering piston pushes out all material inside the
metering chamber and comes to a stop against the end wall.
Discharge is now complete. Even when valve is open toward
the discharge side, material other than a metered shot will
not flow out.
Pressing Chamber
Metering Piston
(Chamber B)
押 出し 室 （B 室 ） 定量 ピスト ン
Metering Chamber
定 量室 （A室 ）
(Chamber A)
Metering Piston
定量ピスト ン
3-2 Discharge
Air Inlet
操作空気
液吐出
Discharge start
開 始
Valve
バルブ
Material Inlet
液入口
When the air piston is pushed down by supplied air, the
material inlet is closed and the material outlet opens. Then,
material pressure in Chamber A decreases with material flow
from the chamber. At the same time, regardless of valve
condition, material, under pressure from a supply pump, is
constantly supplied to Chamber B through the bypass
groove. Accordingly, the metering piston starts moving
forward and material in the metering chamber is discharged.
3-4 Recharge
Exhaust
排気
Valve
バルブ
Material Inlet
液入口
After supplied air is discharged, the valve is lifted up by
material pressure and again pushed against the seat on the
discharge side to close the material outlet. Material flows into
the metering chamber as pushing the piston back. Residual
material in Chamber B flows back through the bypass groove
to Chamber A, being mixed together with newly delivered
material.
4
Air Piston
エ ア ピ ストン
Metering Piston
定量ピスト ン
Metering Piston
定量ピ ストン
Metering Chamber
定量室（Ａ室）
(Chamber A)