預作用報警閥組工作原理及過程分享
來源：http://m.xintli.net/ 日期：2022-05-09
川消預作用報警閥組是由雨淋閥和濕式報警閥上下串接而成，雨淋閥位于供水側，濕式報警閥位于系統側而成為預作用閥組。那么預作用報警閥組工作原理及過程是怎樣的？
The pre-acting alarm valve group is composed of rain valve and wet alarm valve, the rain valve is located at the water supply side, the wet alarm valve is located at the system side and becomes the pre-acting valve group. So what is the working principle and process of the pre-acting alarm valve set?
預作用閥下方為雨淋閥，上方為濕式報警閥。處于伺應狀態時，系統側充有有壓氣體，下方雨淋閥則依靠壓力腔或者隔膜腔控制水源側的壓力。
Below the pre-acting valve is the rain valve, above is the wet alarm valve. When in the waiting state, the system side is filled with pressurized gas, and the shower valve below depends on the pressure chamber or diaphragm chamber to control the pressure at the water source side.
發生火災時，兩只獨立的感煙探測器形成“與”邏輯報警信號，邏輯控制器發出控制信號打開預作用報警閥組上的電磁閥（或打開手動快開閥），壓力腔泄壓。
In case of fire, two independent smoke detectors form “and” logic alarm signal, and the logic controller sends out control signal to open the solenoid valve on the pre-acting alarm valve set （or open the manual quick-opening valve）， and the pressure chamber relives pressure.
管網消防用水發生流動后觸發流量開關、低壓壓力開關，有壓水進入報警管路后觸發壓力開關、水力警鈴，同時打開快速排氣閥，整個系統在1min或2min內完成排氣充水。
When the fire water flows in the pipe network, the flow switch and low-pressure pressure switch are triggered. When the pressurized water enters the alarm pipe, the pressure switch and hydraulic alarm bell are triggered. At the same time, the quick exhaust valve is opened, and the whole system exhausts the water in 1 or 2 minutes.
完成排氣沖水后預作用系統轉換為濕式系統，隨著火災溫度達到噴頭熱熔元件設計溫度，噴頭元件破裂后直接出水撲救火災。
After exhaust flushing, the pre-action system is transformed into a wet system. As the fire temperature reaches the design temperature of the nozzle hot melt element, the water will be directly discharged to fight the fire after the nozzle element is broken.
預作用報警閥組由預作用閥、水力警鈴、壓力開關、空壓機、空氣維護裝置、信號碟閥等組成，安裝閉式灑水噴頭，并以常用的探測系統作為報警和啟動的裝置。其動作原理：一旦發生火災，安裝在保護區感溫感煙火災探測器發出火災報等信號。
The pre-acting alarm valve group consists of pre-acting valve, hydraulic alarm bell, pressure switch, air compressor, air maintenance device, signal disc valve, etc. The closed sprinkler head is installed, and the common detection system is used as the alarm and start-up device. Its operating principle: once a fire occurs, the temperature and smoke fire detector installed in the protected area sends out fire alarm and other signals.
火災報警控制器或消防控制中心，接到報警信號后發出指令打開雨淋閥上電磁閥，使雨淋閥開啟，壓力水流進系統側管網，變成濕式噴水系統，同時水力警鈴發出報苦，壓力開關動作反饋給控制中心顯示管路已充水，并啟動消防泵。此時管道上安裝閉式灑水噴頭尚未釋放，不會噴水。
Fire alarm controller or fire control center, after receiving the alarm signal sent instructions to open the deluge valve solenoid valve, make the deluge valve opens, the side of the pipe network pressure water flow into the system, into a wet water spray system, hydraulic alarm issued to bitter at the same time, the pressure switch back to the control center shows that line has water filling, and start the fire pump. At this time, the closed sprinkler installed on the pipeline has not been released and will not spray water.
人尚可主動地經主管人員采取適當行動將火撲滅，避免噴頭動作水漬造成的損失。如果火災控制不住繼續發展，致使閉式噴頭玻璃球動作噴水，水泵自動啟動。火災撲滅后，應將電磁閥關閉，使雨淋閥關閉，并排除管中的水使系統充氣壓力保持在0.03-0.05MPa范圍內，恢復準工作狀態。
People can also take the initiative to take appropriate action by the supervisor to extinguish the fire, to avoid the loss caused by sprinkler action water stains. If the fire can not be controlled and continues to develop, the glass ball of the closed sprinkler head will spray water and the pump will start automatically. After the fire is extinguished, the solenoid valve should be closed to close the rain valve, and the water in the pipe should be removed to keep the inflation pressure of the system within the range of 0.03-0.05mpa, and the quasi-working state should be restored.
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