Summary of the settings of pressure relief valve, emergency shut-off valve and emergency opening valve: Pressure relief valve, emergency shut-off valve and emergency opening valve are valves developed and applied in recent years, which are concerned by the construction and fire water supply industry. The question talked about his own views.
Keywords: pressure relief valve, emergency shut-off valve, emergency opening valve, hydraulic control valve, fire protection
1 pressure relief valve
The pressure relief valve is arranged on the outlet pipe of the fire pump, and is normally closed. When the pressure of the fire water supply network exceeds the set value, it is automatically opened to prevent the water supply system from being damaged due to overpressure.
The overpressure of the fire water supply network is mainly due to the following reasons: 1 The flow rate of the pump selected according to the fire design flow rate—the head curve is steep, and the overpressure occurs during the small flow operation (self-test or early fire); Therefore, (such as power outage) stop, the outlet pipe has not taken the corresponding technical measures, stop pumping water hammer caused overpressure.
The relief valve settings should pay attention to the position, caliber selection, pressure setting and corresponding accessory configuration.
1 Pressure relief valve can be located near the fire pump or near the fire water tank. Design Code for Automatic Sprinkler System GBH84-1985 Revised Article 10.3.3 of the draft for review: “Each group of pumps...The outlet pipe shall be provided with a control valve......, if necessary, a pressure relief valve shall be provided.†The approval draft was changed to read: "...if necessary, measures should be taken to control the outlet pressure of the water supply pump." These measures include the pressure relief valve.
When the pressure relief valve is installed on the fire pump outlet pipe, it can be placed before and after the check valve. It is set before the check valve to eliminate the overpressure caused by the small flow operation of the pump, and after the check valve (in the direction of the water flow), it can not only eliminate the overpressure caused by the small flow of the pump, but also eliminate the pump stop. The overpressure caused by the water hammer does not cause any harm or loss even if the fire pump water outlet pipe does not take other measures to eliminate the water hammer of the pump (speed closed check valve, slow closing check valve, buffer tank, etc.).
2 The pressure relief valve has two methods, one is the same diameter as the fire water supply main pipe or the first one, and the other is the pressure relief valve with DN100 or DN150.
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