| 摘要 |
PURPOSE: A pressure gauge is provided to precisely measure hydraulic pressure even if the pressure gauge is installed in a pipe path processing a great amount of waste water. CONSTITUTION: A pressure gauge includes a flange body(100) having a hollow section(110) and a coupling hole(120) communicated with the hollow section(110) and a pair of flanges(200) coupled to both sides of the flange body(100) and having a hollow section(210). A ring diaphragm(300) is inserted into the hollow section(110) of the flange body(100). The ring diaphragm(300) is positioned between the flange body(100) and the flanges(200). A lower end of a guide nipple(400) is coupled to the coupling hole(120) of the flange body(100). A rotary nipple(500) has a coupling hole, in which a thrust ball bearing(600) is inserted. The rotary nipple(500) is rotatably coupled to an upper peripheral portion of the guide nipple(400). An indicator(700) is coupled to the coupling hole of the rotary nipple(500). Actuating liquid(800) is filled in an area extending from the coupling hole(120) of the flange body(100) to the indicator(700) in order to display pressure applied to the ring diaphragm(300).
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