SMC Networks PA3000 Series, Manual, Page: 6 / 29

Automatically Operated Type
1. When air is supplied, it passes through the switching valve and enters drive chamber B.
2. Diaphragm B moves to the right, and at the same time diaphragm A also moves to the right pushing pilot valve A.
3. When pilot valve A is pushed, air acts upon the switching valve, drive chamber A switches to a supply state, and the air which was in
drive chamber B is exhausted to the outside.
4. When air enters drive chamber A, diaphragm B moves to the left pushing pilot valve B.
5. When pilot valve B is pushed, the air which was acting upon the switching valve is exhausted, and drive chamber B once again
switches to a supply state. A continuous reciprocal motion is generated by this repetition.
1. When air enters drive chamber B, the fluid in pump chamber B is forced out, and at the same time fluid is sucked into pump chamber A.
2. When the diaphragm moves in the opposite direction, the fluid in pump chamber A is forced out, and fluid is sucked into pump chamber B.
3. Continuous suction and discharge is performed by the reciprocal motion of the diaphragm.
Drive unit
Control unit
Pilot valve A Pilot valve B
Diaphragm B
Diaphragm A
Drive chamber A
Drive chamber B
Check valve
Shaft
Pump chamber B
Pump chamber A
Discharge port
(FLUID OUT)
Suction port
(FLUID IN)
Switching valve
Air supply port (AIR SUP)
Air Operated Type
1. When air is supplied to P1 port, it enters drive chamber A.
2. Diaphragm A moves to the left, and at the same time diaphragm B also moves to the left.
3. The fluid in pump chamber A is forced out to the discharge port, and the fluid is sucked into pump chamber B from the suction port.
4. If air is supplied to the P2 port, the opposite will occur. Continuous suction and discharge of fluid is performed by repeating this process
with the control of an external solenoid valve (5 port valve).
5 port solenoid valves
P1 P2
Diaphragm B
Diaphragm A
Drive chamber A Drive chamber B
Shaft
Check valve
Pump chamber B Pump chamber A
Air supply port
(AIR SUP)
Discharge port
(FLUID OUT)
Suction port
(FLUID IN)
Working Principle
Air exhaust port
(AIR EXH)
Drive unit
Control unit
Drive unit
External solenoid
valve
674
Series
PA