quality assurance
The function of the pressure relief valve: During the operation of the fire water supply system, the flow direction of the main pipe is from left to right, controlling water all the way into the pilot valve control room. When the water pressure is less than the set pressure relief value, the thrust of the pilot valve spring is greater than Due to the pressure of the water, the pilot valve disc is in a closed state. The other controlled water enters the upper chamber of the main valve through the throttling needle valve and generates a static pressure. The pressure in the upper chamber is equal to the pressure in the raw flow channel. Since the upper plane of the main valve disc is larger than the lower plane, the pressure exerted by the upper chamber on the disc is greater than the pushing force of the water in the main channel on the disc, causing the main valve to be in a closed state. If the water pressure in the main pipe rises and exceeds the set pressure relief value, the pressure of the water flowing into the conduit control room through the control pipe increases. The water pressure is greater than the spring thrust. At this time, the pilot valve is opened and the main valve starts to relieve pressure. Due to the control of the throttle valve, the water supply is insufficient, causing the pressure in the upper chamber of the main valve to decrease, and the lower marrow of the main valve to freeze. The flow thrust is greater than the upper chamber pressure, the valve disc rises, and the main valve opens to quickly release the pressure. Since the above process is completed in an instant, no harm will be caused when overpressure occurs in the indoor fire water supply system.
If the water pressure in the main pipeline continues to increase, the opening amount of the pilot valve will also increase, making the pressure difference between the upper chamber and the lower chamber of the main valve larger. The opening amount of the main valve will also increase, and the system will release pressure faster. on the contrary,. If the water flow pressure in the main pipe decreases (for example, when the number of indoor fire hydrants used increases or the number of open nozzles increases), the pressure in the pilot valve control chamber will decrease accordingly, and the opening amount of the pilot valve will become smaller. The pressure in the upper chamber of the main valve increases, and the lower valve disc of the main valve decreases, making the water flow pressure in the main pipeline stable at the system design i. Do pressure holding within feeding.
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