On the pressure relief valves, emergency shut-off valve and open the valve settings (a)

Pressure relief valves, emergency shut-off valve and emergency valve to open the settings Abstract: The pressure relief valves, emergency shut-off valve and emergency valve is open and applications in recent years the development of valves, water supply has been building and fire circles, its settings On the issue of his own views.



Key words: pressure relief valve to open the emergency valve emergency shut down valve hydraulic control valves, fire-specific



1 pressure relief valve



Pressure relief valve installed in the fire service pump outlet pipe, the normal shut down, the fire more than the pressure of water supply network settings automatically when turned on, water supply system in order to prevent damage due to overpressure.



Fire to the water distribution network of over-pressure was mainly due to the following reasons: ① design flow selected by the fire pump flow - lift curve is steep type, in a small flow of run-time (the initial self-test or fire) will appear overpressure; ② pumps due to a sudden it (such as power failure) stop transfer, delivery and did not take appropriate technical measures to stop pump water hammer caused by overpressure.



Pressure relief valve settings should pay attention to the location, caliber choice, pressure and the corresponding annex to configuration settings and so on.



① pressure relief valve may be located in the vicinity of the fire pump or water tank near the fire. Automatic sprinkler system design specifications "GBH84-1985 amendment to Article 10.3.3 of the支审稿requirements:" ... ... each pump control valve outlet pipe should be set up ... ... and, if necessary, pressure relief valve should be located. "Approval of the provision in the draft was changed to: "... ... when necessary, should be taken to control the pump outlet pressure for the measure." These measures which includes the pressure relief valve.



When the pressure relief valve installed in the outlet pipe when the fire pump can be located in a non-return valve before and after. Before a non-return valve located in a small flow of water running digestion caused by excess pressure, and after in a non-return valve (along the direction of flow) due to not only remove a small flow of water caused by running the overpressure, but also remove from the p

ball valve check valve

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