发明授权
US4949756A One-way valve 失效
单向阀

One-way valve
摘要:
A one-way valve comprising flat resilient members in face-to-face relationship which are bonded upon two generally parallel tracks defining a passageway therebetween, where the tracks have a tortuous profile along their inner edges, and optionally, where the passageway is creased and/or wetted.
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