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The purpose of the pressure reducing valve for equipment in Article 9.3.5 should be set. When the pressure reducing valve is overhauled or damaged, the setting of the pressure reducing valve is discussed in the new section 9.3.5. "When two or more alarm valve groups are connected. The Other group still maintains a normal water supply to the system. From the purpose of setting it up, if the filter connected to the pressure reducing valve or the pipe before and after the pressure reducing valve group is damaged or repaired, even if the pressure reducing valve is reserved, the whole system should stop the water supply. From the perspective of the entire system, the backup pressure reducing valve is not a necessary condition for achieving safe and reliable water supply to the system.
2 ring pipe network setting to discuss the alarm valve group should be set before the ring water supply pipe. The purpose of setting up the annular water supply pipe in Article 10.1.4 When the pipe, valve or instrument on the side of the ring pipe network is overhauled, the new clause 10.1.4 of the <spray gauge> is: when the automatic sprinkler system is set up When there are two or more alarm valve groups. The other side still maintains a normal water supply to the system. For the purpose of its setting, for the automatic sprinkler system in which two or more alarm valve groups are arranged in parallel, an annular pipe should be provided before the alarm valve. Because in the early stage of the fire, the effectiveness of the automatic sprinkler system is better than that of the fire hydrant. When the indoor fire water consumption of the fire hydrant is greater than 15Ls, at least two inlet pipes should be connected to different pipe sections of the outdoor annular pipe. Therefore, in terms of the safety and reliability of the water supply, it is necessary to set the annular pipe for the alarm valve in which the two or more alarm valve groups are arranged in parallel. For other components of the serial connection wet system, although several sets of alarm valves are provided, due to the shared water distribution main pipe, there is no need to provide an annular pipe before the alarm valve.
The system of the annular water supply pipe is set in front of the alarm valve, in short. If a pressure reducing valve is required, it should be separately installed on both sides of the annular pipe. Generally, the pressure reducing valve is not used. Of course, in the case that the management conditions are good and the pressure reducing valve group can be rotated regularly, the pressure reducing valve for the equipment can also be used. It should be pointed out that the bypass channel should not be placed around the pressure reducing valve.
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Method for setting annular pipe network of self-spraying system pressure reducing valve
The author believes that the third paragraph of Section 9.3.5 and the provisions of 10.1.4 of the "spray gauge" should be appropriately modified, generally stated. The revised provisions can be combined into “When two or more alarm valve groups are installed in parallel in the automatic sprinkler system, an annular water supply pipe should be provided in front of the alarm valve group; when a pressure reducing valve is required, it should be in a ring shape. The two sides of the pipe are separately installed, and the pressure reducing valve can be used for equipment when conditions permit.