A duckbill is a flat, slit-shaped breast-pump valve that opens and closes as the pump cycles, controlling milk flow and maintaining suction.
A duckbill is a type of breast-pump valve named for its flat, wide shape, which resembles a duck's bill. It opens to let milk pass through and closes again as the pump cycles, which is what allows the pump to build and hold suction.
Why do valve types matter?
Breast pumps use different valve designs, and the valve has a direct effect on how well a pump holds suction. Some people find a particular valve type gives better suction or output for them, so the valve can be one variable worth considering if expressing results are disappointing.
When are they replaced?
Valves are wearing parts. Over time the silicone can stretch, tear or lose its shape, which reduces suction and milk output. They are replaced periodically — and any that are cracked or damaged swapped out — to keep a pump working effectively.
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