| 摘要 |
PURPOSE:To enable easy confirmation of operation with pussible individual testing without dismounting a full-water level detection switch, by installing a water drain valve in a pipe line including the full-water level detection switch. CONSTITUTION:In case when a full-water level detecting switch 16 is installed for confirming whether water is filled to the top levels in pipe line and water heaters 2, 3 in a pipe line system of a plant, (a) water-filling test plug 19 is installed before this switch 16 and a water drain valve 20 is installed on its way to a water drain pipe 13. On an occasion of an individual test of the switch 16 with this system, the water drain valve 20 is closed at the beginning and water is led through the test plug 19 for operation testing and upon completion of the test, the water drain valve 20 is opened for discharging water from inside. |
