Boiler as one of the industry's most widely used daily equipment, its belong to the pressure vessel, its safe use is related to people's life and property security, so a final fuse = boiler safety valve plays an important role, so the boiler safety valve installation must comply with the following technical requirements: 1. For boiler steam rating number greater than zero. 5 t/h, at least two relief valve must be installed: rated evaporation is less than or equal to zero. 5 t/h boiler, install a relief valve at least. Split the economizer exit, steam superheater outlet shall be equipped with safety relief valve. 2. 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. Relief valve exhaust pipe should be installed at the bottom have received safety drain pipe, on the exhaust pipe and drain pipe, are not allowed to furnish the switch 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 be improve and prevent twisted casually in hand device for adjusting screw. 4. For the rated steam pressure is less than or equal to 3. 82 mpa boiler safety valve throat diameter should not less than 25 mm: 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 be all in safety valve exhaust steam area 1. 25 times. ( 6) Relief valve must be installed vertically on the top of the drum, the header. Between the relief valve and the drum or header, shall not be equipped with access steam outlet pipe and valve. 7. Boiler safety valve must be manually or automatically emission test on a regular basis, because of the relief valve body and disc will adhesion, regularly test can prevent adhesion, and check whether the Industrial Valves opening pressure accurately and meet the requirements.
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