Safety valve is open-close part under the action of external force in a normally closed state, when the equipment or piping within the medium pressure than specified value, through a discharge medium system to prevent the pipeline or equipment within the medium pressure in excess of the prescribed special valves. Relief valve belong to automatic valve class, mainly for the boiler, pressure vessel and piping, control pressure shall not exceed the specified value, to protect personal safety and equipment operation plays an important role. Note the relief valve must pass through pressure test to use. Family of safety valve is the valve is a special branch, its particularity because only play the role of switch is different from other valves, more important is to protect equipment safe. With the rapid development of economic construction in our country, with more and more pressure control equipment engineering. In view of the need that the equipment pressure relief, relief valve play a crucial role in the process of protection device. The relief valve installation shall meet the following requirements: 1, rated evaporation capacity is greater than zero. 5 t/h boiler, installed at least two relief valve; The rated capacity is less than or equal to zero. 5 t/h boiler, install a relief Industrial Valves at least. Split the economizer exit, steam superheater outlet must furnish the relief valve. 2, the relief valve should be installed vertically in the pot, high location of header. Between the relief valve and the drum or header, shall not be equipped with access steam outlet pipe and valve. 3, lever type relief valve to prevent heavy hammer to mobile devices and on its own limitation lever deviant guide frame, the spring safety valve to have raise a hand and prevent twisted casually adjusting screw of the device. 4, for the rated steam pressure is less than or equal to 3. 82 mpa boiler safety Industrial Valves throat diameter should not less than 25 mm; For the rated steam pressure is greater than 3. 82 mpa boiler safety valve throat diameter should not less than 20 mm. 5, the relief valve and connecting pipe of boiler, its cross-sectional area should not be less than import cross-sectional area of the relief valve. If several common relief valve installed in a short tube attached directly to the drum, the access of the short tube cross-sectional area should not step in all safety valve exhaust steam area 1. 25 times. 6, the exhaust pipe of the relief valve should be installed commonly exhaust steam pipe should be road safety, and have enough area, ensure the exhaust steam flow. At the bottom of the relief valve exhaust pipe should be put on AIRS have received safety drain pipe, on the exhaust pipe and drain pipe, are not allowed to furnish the valve.
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