Bellows safety valve and the general principle of safety valve is basically the same, it is between the valve seat and the bellows increased. For unstable back pressure or toxic, corrosive medium equipment or piping, as overpressure protection device. Bellows eliminates the effects of back pressure fluctuations on safety valve performance, protects the spring and other internals from corrosion of the medium, and effectively prevents media leakage. Article Source:
Bellows safety valve for operating temperature ≤ 300 ℃ of air, steam, LPG and other media equipment and piping, as overpressure protection device. When the equipment and piping pressure exceeds the allowable value, the valve automatically open, and then the full amount of emissions; when the pressure drops to the specified value, the valve automatically shut down to ensure the safe operation of equipment. Is widely used in electric power, metallurgy, petroleum, chemical and other industries, but the bellows safety valve is not suitable for reciprocating compressors, because the compressor fluid pressure fluctuations before and after too much, and the bellows is more sensitive to such fatigue stress, Therefore, the life of safety valve will be greatly reduced.
Bellows safety valve also has the following characteristics:
(1) Seat and body are separable, easy to maintain, economical.
(2) Umbrella recoil plate can effectively improve the lift, the valve flap can be quickly opened under a small pressure, the release of media, so as to achieve the purpose of protecting the equipment.
(3) Adjustable ring can adjust the satisfactory opening and closing pressure.
(4) Reasonable selection of the material of the recoil plate and the guide sleeve, the valve rod and the adjusting screw as well as the appropriate selection of the clearance ensure the valve disc is flexible in motion.
(5) Flap, seat seal Faced with hard facing alloy, surface finish to ensure high sealing and service life.
(6) Bellows in bellows relief valves eliminate the effects of back pressure fluctuations on valve performance and protect the springs and other internals from corrosion of the media.
(7) Selection of springs and bellows and processing stress and strict testing and inspection.
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