the relief valve installation shall meet the following requirements:

( l） Rated capacity greater than zero. 5 t/h boiler, installed at least two relief valve: 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 must furnish the relief valve.

( 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) 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.

( 2) The relief Industrial Valves should be installed vertically in the pot, the top of the 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 Industrial Valves 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.

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