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Why does the “AL” pump only stroke 1 time?

April 26, 2017AL pump stroke time

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Why does the “AL” pump only stroke 1 time?

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The AL pump is not a self-cycling pump. The air pressure must be alternately applied and exhausted from the pump so that it can both discharge and prime. A 3-way air solenoid valve is used for this purpose in the single acting mode (spring return) and a 4-way air solenoid valve in the double acting mode (pressure return). The recommended interval for cycling the air valve/pump is three seconds on, three seconds off.