Maintenance knowledge of the hottest wet alarm val

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Maintenance knowledge of wet alarm valve

wet alarm valve is the central nervous system of automatic sprinkler system. Its normal operation directly affects the normal operation of the whole system, so it is very important for the daily maintenance of wet alarm valve

1. Check whether the alarm bell rotates normally once a half month. When checking, open the drain valve, and the alarm valve disc will open automatically due to the water pressure difference. After seconds of water flowing into the delayer, the alarm bell will sound. If the alarm bell doesn't make a sound, check the whole alarm bell pipe to remove its scale, sediment and dirt, so as to make the water flow smooth and prevent the alarm failure. If the alarm bell still sounds after the alarm bell check cock is closed, check whether the check cock is closed tightly, whether there are obstacles accumulated on the annular water tank of the alarm valve, and whether the rubber under the alarm valve disc is aging or wrinkled. These faults should be eliminated in time

2. Check the flowing water pressure once every six months. When checking, open the drain valve and the alarm bell will sound. At this time, the pressure value displayed on the pressure gauge should not drop significantly. If the drop is significant, check whether the gate valve is blocked or not opened at the maximum; If the pressure drop shown on the pressure gauge is obvious and the alarm bell does not alarm, check whether the disc of the wet alarm check valve starts normally

3 rocker type drop hammer impact compaction adopts ball screw, which can use a smaller driving power. The machine structure is shown in Figure 1. Check the sealing surface of the rubber gasket on the valve disc, and remove the dirt and foreign matters attached to the rubber gasket; If it is worn or damaged, it should be replaced in time

③ the size of the curve coordinate can be adjusted according to the actual experimental data

4. The annular groove of the seal and valve seat should be checked once a year to remove dirt or foreign matters; If it is damaged, it should be replaced with spare parts

5. According to the water quality of fire water, regularly open the drain outlet on the filter to clean up dirt

6. Daily pay attention to whether the water level and pressure of the fire pool and the state of the corresponding valves meet the specification requirements

7. Treatment of false alarm:

when a false alarm is found, check whether the whole pipe is leaking water and whether the overflow hole of the delayer is blocked. Many domestic enterprises have developed their own technology and achieved a range of production plugs or poor drainage. Open the relief test valve to drain the accumulated water in the system or check whether the water supply pipe is blocked

check whether the sealing between the wet alarm valve disc assembly and the valve seat is not tight, so that a large amount of water enters the delayer

check whether the nozzle in the pipe starts the release mechanism due to unexpected reasons

after finding out the cause of false alarm, it should be handled in time to ensure that the system is in a good standby state at any time

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