| 摘要 |
The present invention relates to a raindrop preventing device (check valve) for low pressure which can control liquid or gas even at low pressure. More specifically, the present invention provides a raindrop preventing device for low pressure which can be assembled and disassembled easily and can eliminate the possibility of raindrops, which are caused by hung foreign materials, by increasing the expansion and contraction of a packing member in an eccentric direction. The raindrop preventing device according to the present invention comprises: a main body of the preventing device having a screw part formed above a boundary plate integrated with a hose combination pipe at a lower side, having a housing combination part formed on the upper end of the screw part, having a packing mounting surface formed at the edge of the upper surface of the housing combination part, having a packing inserting part, which has a discharge flow path formed on a side to intercommunicate with a supply flow path inside the hose combination pipe, protruding from the middle of the packing mounting surface, and including an elliptical guide head to be connected to the upper side of the packing inserting part by a narrow connector; a packing member having a shrunken discharge pipe integrally formed on the upper end of a seat pipe connected to an O-ring and inserted and combined with the guide head and the packing inserting part so that the O-ring can be mounted on the O-groove of the main body of the preventing device; a switch housing having a sprinkler combining pipe put on the outside of the packing member and having a discharge pipe inserted above a body with an atmospheric pressure inducing hole, having a ring pressurizing part integrally formed at a lower side to pressurize the O-ring mounted on the ring-groove, and having a combination ring edge, which is inserted into the housing combination part formed on the main body of the preventing device, protruding downward from the edge of the ring pressurizing part; and a closely adhering nut having a pressurizing ring formed to pressurize the ring pressurizing part of the switch housing and having a screw hole formed therein to be coupled to a screw part formed on the main body of the preventing device. |
