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2. Duckbill valve - Wikipedia

   en.wikipedia.org/wiki/Duckbill_valve

   Duckbill exhaust valve for Draeger twin hose regulator. A duckbill valve is a check valve, usually manufactured from rubber or synthetic elastomer, and has two or more flaps, usually shaped like the beak of a duck. [1] It is commonly used in medical applications to prevent contamination due to backflow. A cross-section diagram of a Duckbill valve.

3. List of valves - Wikipedia

   en.wikipedia.org/wiki/List_of_valves

   Double beat valve; Double check valve; Duckbill valve; Fill and drain valve: a valve used in space and missile industry which achieves extremely tight leakage, while providing redundant inhibits against external leakage [1] Flapper valve; Flow divider valve: a valve providing a plurality of output flows from a single fluid source [2]

4. Breast pump - Wikipedia

   en.wikipedia.org/wiki/Breast_pump

   A breast pump is a mechanical device that lactating women use to extract milk from their breasts. They may be manual devices powered by hand or foot movements or automatic devices powered by electricity. Breast pumps come in several varieties to suit different needs of mothers.

5. Duckbill - Wikipedia

   en.wikipedia.org/wiki/Duckbill

   Duckbill may refer to: Platypus, Ornithorhynchus anatinus; Duckbill dinosaurs, family Hadrosauridae; Duckbill fishes, family Percophidae; Duckbill eels, family Nettastomatidae; Duckbill choke, a shotgun accessory; Duckbill valve, a valve used to prevent back flow; Duckbill (rock formation), Oregon; Duckbill mask

6. Trickle valve - Wikipedia

   en.wikipedia.org/wiki/Trickle_valve

   Trickle valves can be used only on systems operating under negative pressure. The vacuum created inside the dust collector holds the valve closed, allowing a head of material to build up above the trickle valve. Once the pressure of the material equals the negative pressure of the system, the valve is forced open and a trickle of material will ...

7. Voice prosthesis - Wikipedia

   en.wikipedia.org/wiki/Voice_prosthesis

   The flange near the food pipe (esophageal flange) is more rigid than the tracheal flange, near the windpipe. The one-way valve can be molded in one piece with the prosthesis and is often supported by a fluoroplastic valve seat (a colored ring that is tightly secured into the shaft of the prosthesis, adding rigidity and which is radiopaque).