|Process Pumps (Diaphragm Pumps)
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What is the difference between “automatic operation” and “air operation” of PA series process pumps?
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Automatic operation type:
Pilot valves A and B automatically switch the switching valve inside the pump by supplying air from the air supply port, without having to repeat the ON/OFF of the solenoid valve for driving the pump. Air is supplied and exhausted alternately to drive chambers A and B by the switching valve so that the diaphragm is driven to the left and right, and the fluid in pump chambers A and B is alternately sucked in and discharged.
Note) Install a 3-port solenoid valve in front of the air supply port to operate and stop the process pump. With a 2-port valve, the pressure in the pump cannot be exhausted when the pump stops, which may result in reduced product life or malfunction.
Air-operated type:
Pilot air from an external 5-port solenoid valve is supplied to drive chambers A and B of the PA main unit via ports P1 and P2. By switching the external 5-port solenoid valve, air is supplied and exhausted to drive chambers A and B so that the diaphragm is driven to the left and right, and the fluid in pump chambers A and B is alternately sucked in and discharged. The pump is driven only when the external solenoid valve is switched.
Note) To prevent pressure from remaining in the pump when the pump is stopped, a solenoid valve with a 3-position exhaust center, which exhausts air when it is de-energized, is used.
PA series Working Principle :Automatically Operated Type/ Air Operated Type can be found here.
