The present invention relates to a low pressure drop prevention valve (check valve) which can easily control a liquid or a gas even at a low pressure, more specifically, it is easy to disassemble and assemble, and the expansion and contraction of the packing member is made in the eccentric direction, And to provide a low pressure water fall prevention device which can eliminate the concern. That is, the present invention provides a low pressure water fall prevention apparatus comprising: And a hose coupling surface is formed on the upper surface of the housing coupling portion, and a hose coupling surface is formed at the center of the packing hinge coupling surface, A protector main body having an elliptical induction head for protruding a packing fitting portion formed with a discharge flow passage communicating with a supply passage inside the tube and connecting the packing fitting portion to the upper side of the packing fitting portion by a constricted coupling neck； A packing member fitted to the induction head and the packing fitting part such that an axial pipe connected to the O-ring is integrally formed at the upper end of the sheet pipe and the O-ring is placed on the packing face of the preventive device body； A ring pressing part for pressing the O-ring placed on the packing face side downward is integrally formed, and a ring pressing part for pressing the O- A switch housing formed in a downwardly protruding shape and having an engagement fingertip fitted into a housing engagement portion formed in a protector body at an edge of a portion； A pressing ring for pressing the ring pressing portion of the opening and closing housing, and a tightening nut having a screw hole formed therein for fastening to the screw portion formed in the preventive device body.본 발명은 액체 혹은 기체를 저압에서도 쉽게 제어할 수 있는 저압용 낙수방지기(체크밸브)에 관한 것으로서, 보다 구체적으로는 분해 조립이 간편하고 패킹부재의 신축을 편심방향으로 키워 이물질 걸림으로 인한 낙수의 염려가 해소될 수 있도록 한 저압용 낙수 방지기를 제공코자 하는 것이다.즉, 본 발명은 저압용 낙수 방지기에 있어서； 하측으로 호스결합관이 일체로
