The safety valve of coal-fired hot blast stove is an automatic pressure relief alarm device. Its main function is: when the pressure of hot blast stove exceeds the allowable value, it can automatically open the exhaust steam and pressure relief, at the same time, it can send out alarm sounds and warn the furnace manager, so as to take necessary measures to reduce the pressure of hot blast stove. When the pressure of the hot blast stove drops to the allowable value, the safety valve can be closed by itself, so that the hot blast stove can operate safely within the allowable pressure range and prevent the overpressure of the hot blast stove from causing explosion. Installation of safety valve on hot-water hot-blast stove can relieve pressure and alarm when overpressure is caused by vaporization of hot-blast stove, so as to achieve the purpose of safe operation. Therefore, safety valve is one of the indispensable safety accessories on hot-blast stove, and the fireman often compares safety valve to "ear". In some hot blast stoves, if no exhaust valve is installed, the air in the drum can be removed by the safety valve in order to facilitate water intake and fire before operation. In order to relieve the vacuum condition in the drum, air can also be introduced into the drum by opening the safety valve after the stoppage of the furnace.
The safety valve is mainly composed of the valve seat, the valve core and the pressurizing device. Its working principle is that the passage in the seat of the safety valve is connected with the steam space of the hot blast stove, and the pressure generated by the pressure device of the valve core is tightly pressed on the seat when the valve is closed; if the pressure in the hot blast stove is too high, the pressure of the steam on the valve core also increases, and when the pressure on the valve core is greater than that of the pressure device, the valve core will be closed. The valve is lifted away from the seat, so that the safety valve is in an open state, so that the steam in the hot blast stove is discharged to achieve the purpose of pressure relief. When the pressure in the hot blast stove decreases, the supporting force of the steam on the valve core also decreases. When the steam pressure in the hot blast stove returns to normal, that is, when the supporting force of the steam is less than that of the pressurizing device on the valve core, the safety valve closes by itself.
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