2
2. Principle of Operation
The YAMADA Air-powered Pump is a reciprocating type pump that is driven by compressed air. This pump consists
of an air motor to drive the pump and a lower pump to draw up the liquid material as shown in the figure.
2.1 Function of the Air Motor
1) In the status shown in the figure at right, the air piston reaches the
upper limit and is now about to go down.
2) The compressed air fed from the air supply port is applied to the
chamber A through the air passage tube from the path provided in
the lower part of the slide valve. The air pressure of the chamber
B is discharged out through the slide valve.
3) As a result, the air piston starts to go down.
4) When the air piston collides with the trip shoe, the slide valve is
momentarily tripped downward by the function of the trip
mechanism.
5) As a result, the air supply is conducted to the chamber B and the
chamber A is conducted to the exhaust port, so that the air piston
is changed to go up.
6) Thus, the air motor continues its reciprocating motion
automatically as long as the supply air is fed to it.
2.2 Function of the Lower Pump
1) The lower pump integrated with the air motor traces the
reciprocating motion of the air motor.
2) This reciprocating motion of the piston causes a sucking operation
and a compressive operation to the suction valve and the piston
valve of the lower pump, thereby discharging the liquid
intermittently.
3) This reciprocating motion is automatically continued until the
delivery side is closed and the liquid compressive pressure of the
lower pump is balanced with the pressure of the air motor.
Summary of Contents for 880267
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