| 摘要 |
A check valve is provided to prevent voluntary discharge of once injected air by allowing inflow of air in one direction through a simple structure. A check valve(100) comprises: an external body part(50) made of soft material with flexibility, into which the check valve is inserted; an upper member(10) made of polyethylene(PE) material adhered to the inner surface of the external body part; a lower member(20) made of nylon material, both ends of which are combined with both ends of the upper member; a heat-resistant coating layer(30) laid on top of the lower part and having a feature not adhered by heat; and a thermal adhesive post part(40) separated from the heat-resistant coating layer.
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