The utility model is a kind of structure of related non-return valve,It includes a valve seat colloid,One formed valve seat colloid side at guidance part,Buffering groove portion and at least one at one formation what valve seat colloid side are formed through the joint-cutting portion of what valve seat colloid,Wherein guidance part extends inwardly to form a strengthening section,And system, joint-cutting portion is adjacent to strengthening section,Again above-mentioned guidance part,Buffering groove portion and joint-cutting portion are all coaxially outwardly formed by valve seat colloid center,By above-mentioned structure,When conduit is punctured by guidance part,The guiding that conduit will receive guidance part smoothly punctures joint-cutting portion,And strengthening section will prevent joint-cutting portion excessive tearing from valve seat colloid being caused integrally to damage,And when conduit extraction,Buffering groove portion will provide valve seat colloid enough activity spaces,Making conduit, just what is extracted out,Thereby reach it is not tearable,Conduit lead position,Easy what plug and the practical improvement for preventing leakage.本新型為有關一種逆止閥之結構，其包含一閥座膠體、一形成閥座膠體一側處之導引部、一形成於閥座膠體一側處之緩衝槽部及至少一貫通形成於閥座膠體之切縫部，其中導引部向內延伸形成一強化部，且切縫部係鄰近強化部，又上述之導引部、緩衝槽部及切縫部皆由閥座膠體中心處同軸向外形成，藉由上述之結構，當導管由導引部處穿刺時，導管會受到導引部之導引平順穿刺切縫部，而強化部將防止切縫部過度撕裂導致閥座膠體整體損壞，而導管抽出時，緩衝槽部將提供閥座膠體足夠的活動空間，使導管便於抽出，藉此達到不易撕裂、導管導位、易於插拔及防止滲漏之實用進步性。
