| 摘要 |
<p>The present invention relates to an automatic water shut-off valve for low pressure which can open up and close down a fluid automatically at low pressure. An automatic water shut-off valve (1), which controls a fluid in the longitudinal progressing direction of the fluid, comprises a body (2) in which a nipple (21) is formed towards the lower side, a rubber diaphragm (3) inserted into a protruding threaded pipe (22) formed on the upper side of the body (2), and a pressurizing holder (4) which pressurizes the rubber diaphragm (3) while being pressurized by a fixing cap (5) fastened to the protruding threaded pipe (22). The pressurizing holder (4) and fixing cap (5) are formed so as to have a drainage hole (45) and a cap drain hole (51) respectively, such that the fluid can drain naturally through a fluid transfer hole (35) formed in the centre of the rubber diaphragm (3) when the fluid is a compressed air fluid or is below a set pressure, whereas a fluid opening and closing surface (33) of the rubber diaphragm (3) can be grounded against a fluid shut-off projection (44) formed in the pressurizing holder (4) so as to shut off the fluid when the fluid is a non-compressed fluid or is above a set pressure.</p> |
