YAMADA KGK-400 Series, Инструкция

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4
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. 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.
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.
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.
3. Principle of Operation
3-1 Standby 3-2 Discharge
3-3 Completion 3-4 Recharge
バ ル ブ
定 量室 （A室 ）
押 出し 室 （B 室 ） 定量 ピスト ン
液入口
バルブ
定量ピスト ン
エ ア ピ ストン
液入口
液吐出
開 始
操作空気
バル ブ
定量ピスト ン
液入口
吐出完了
操作空気
バルブ
定量室（Ａ室）
定量ピ ストン
排気
液入口
Metering Piston
Valve
Material Inlet Material Inlet
Valve
Air Inlet
Air Piston
Metering Piston
Material Inlet
Valve
Metering Piston
Exhaust
Material Inlet
Valve
Metering Piston
Air Inlet
Discharge end
Discharge start
Metering Chamber
(Chamber A)
Metering Chamber
(Chamber A)
Pressing Chamber
(Chamber B)