double-acting hand pump

A hand pump that moves fluids during both strokes of the pump handle. A wobble pump is an example of a double-acting hand pump.
When the handle of the wobble pump is operated, the negative pressure created on whatever side is pulled upward lifts the lower flapper, allowing the fuel to flow behind it. As the handle is moved in the opposite direction, the lower closes, preventing the fuel from escaping back into the line and causing it to flow through the passage shown by the arrows. The fuel is then forced through the upper flapper on the opposite side by the upward movement of opposite end of the wobble blade, thence to the carburetor. The cycle is repeated each time the handle is moved in either direction.

Aviation dictionary. 2014.

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